Gear Splitter Suggestions For '98 5 Spd 12 Valve 2 Wheel Drive - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
Closed Thread
 
Thread Tools
#1 Old 04-29-2010, 04:24 PM
dodge98cummins
Registered User
 
Join Date: Apr 2010
Location: Orange County, California
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Gear Splitter Suggestions For '98 5 Spd 12 Valve 2 Wheel Drive

I have a '98 12 valve 5 speed, and am considering adding a gear splitter to it, which is offered by a company called GearVendors(dot)com out of San Diego California.

This would drop my RPM down from 2100 to maybe 1500 or so while traveling on the highway with no load in 5th gear, improving fuel mileage, as well as prolonging engine life, as far as I can figure.

Right now, I am averaging between 21 to 23 MPG, and would expect that to improve by at least 4 or 5, bringing me to between 25-28, which, to me, would be incredible for a 7000 lb truck, when most other passenger cars that weigh just 4000 lbs get around 20 MPG!

It, of course, would offer great benefits while towing up grades, etc., as well.

Has anyone on here ever done this, and have any suggestions or advice?

Thanks in advance!

B.

dodge98cummins is offline  
Sponsored Links
Advertisement
 
#2 Old 07-12-2010, 02:59 AM
BigCE
Registered User
 
BigCE's Avatar
 
Join Date: Aug 2007
Posts: 58
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Although I have never tried this, I would suspect that 1500 rpm would be too low a engine speed to move your truck at 65-70mph. The engine would have to work to hard thus reducing your mpg. I have no doubt the cummins could do it but I do think it would be working hard.

2010 Dodge Cummins MegaCab Laramie
Mini Maxx / OD / MCC custom tune
35" Toyo M/Ts
BigCE is offline  
#3 Old 07-12-2010, 07:17 AM
Clunk
Senior Member
 
Clunk's Avatar
 
Join Date: Aug 2005
Posts: 2,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I thought 12 valvers were low rpm stump pullers...help me out fellas.

'01.5 2500 4x4 Red QC Sport HO SWB, 6spd.,cowl hood, 4" ex., Edge Drag Comp, Banks boost & pyro pillar mount, single Holley style lift pump...13psi WOT, US Gage & 4 grease gun lines for fuel pressure monitor, Power Service in the tank, Amsoil in the trans and Valvoline in the pan. Vulcan Big Line kit, Napa #2790 BHAF, cheapo fuel cooler, IP 200's, Cat C300 turbo 3.55 gears jes' like Ram3500Dually sez..., ARP studs, 507.9hp, 1050 torq.

Time to turn so's you don't burn.
Clunk is offline  
#4 Old 07-12-2010, 11:57 PM
Red Sleeper
Blowin n' Goin
 
Red Sleeper's Avatar
 
Join Date: Jun 2007
Location: Pearland
Posts: 3,688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You dont want to get to low on your RPM. 1600 rpm is the sweet spot for torque on a Cummins, just take a look at some dyno sheets.. I would really want to get my math 100% correct and know what kinda rpm im going to be running after I would install it. Have you thought about maybe putting in different gears in for overdrive instead? I dont know how much you tow, just a though.




Quote:
Originally Posted by Clunk View Post
I thought 12 valvers were low rpm stump pullers...help me out fellas.

Your right sir. They got that low end grunt with earth moving torque.

Nick J
05 Cummins QCSB. TransGo Smarty H2O/CH4O
13 Jetta TDI 6spd auto
91 Cummins Dedicated water hauling vehicle
94 Z28 LT1 355ci 6spd Lots of Tubing
RockCrawling Dakota http://www.dodgetalk.com/forums/show...90#post4512290
www.builtwithblood.com
Red Sleeper is offline  
#5 Old 07-13-2010, 07:04 PM
Bluedually4x4
Registered User
 
Bluedually4x4's Avatar
 
Join Date: Jul 2009
Location: Casper
Posts: 543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have only heard from one guy that has one and his truck has a 4.10 final drive. He really liked it and has not had any problems with the one he has. Really 1600-1900 rpm would be better for fuel economy.

1998 1 ton dually 4x4. 12valve Cummins 5 speed manual. TST # 10 fuel plate DPI 75 hp injectors ATS 3 piece exhaust manifold BHAF intake 5" Turbo back exhaust dual 5" stacks South Bend 13.5 clutch 2001 flip out towing mirrors 16 degrees of timing and 3000GS BD Super B turbo
Dynoed at 452 horse power
And over 900 foot pounds
Bluedually4x4 is offline  
#6 Old 07-15-2010, 09:37 AM
Clunk
Senior Member
 
Clunk's Avatar
 
Join Date: Aug 2005
Posts: 2,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ok, I see a 5 spd.
Remember what kills the 5th gear...lugging around in 5th.

'01.5 2500 4x4 Red QC Sport HO SWB, 6spd.,cowl hood, 4" ex., Edge Drag Comp, Banks boost & pyro pillar mount, single Holley style lift pump...13psi WOT, US Gage & 4 grease gun lines for fuel pressure monitor, Power Service in the tank, Amsoil in the trans and Valvoline in the pan. Vulcan Big Line kit, Napa #2790 BHAF, cheapo fuel cooler, IP 200's, Cat C300 turbo 3.55 gears jes' like Ram3500Dually sez..., ARP studs, 507.9hp, 1050 torq.

Time to turn so's you don't burn.
Clunk is offline  
#7 Old 07-15-2010, 10:26 PM
Bluedually4x4
Registered User
 
Bluedually4x4's Avatar
 
Join Date: Jul 2009
Location: Casper
Posts: 543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
All the 5th gear problem is the nut loosening over time, mine quit while putting along flat ground at 65 mph. Unless you have the updated gear and nut it can fail at any time.

1998 1 ton dually 4x4. 12valve Cummins 5 speed manual. TST # 10 fuel plate DPI 75 hp injectors ATS 3 piece exhaust manifold BHAF intake 5" Turbo back exhaust dual 5" stacks South Bend 13.5 clutch 2001 flip out towing mirrors 16 degrees of timing and 3000GS BD Super B turbo
Dynoed at 452 horse power
And over 900 foot pounds
Bluedually4x4 is offline  
#8 Old 07-15-2010, 10:50 PM
cmns2500
Sen๓r Member
 
cmns2500's Avatar
 
Join Date: Oct 2008
Location: Houston-ish
Posts: 17,165
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
even w/ the 3.55's i wouldn't mind a GVOD unit so i could run 80ish at 2k instead of 70....

and this is with an auto

CJ AKA Homie Mango


02 Taco
cmns2500 is offline  
#9 Old 07-22-2010, 12:13 PM
madmikeismad
R.I.P Big Blue
 
madmikeismad's Avatar
 
Join Date: Sep 2008
Location: Moore OK/WNY/Johnson City
Posts: 4,798
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Throw some 35's on it cj. I do 80 at 1900 and about 5psi

Mike Hill
Sometimes I laugh so hard, the tears run down my leg.
Purple People Eater - 98 12v http://picasaweb.google.com/mch8223/Diesel#
623hp with a gate that won't stay closed: http://www.youtube.com/watch?v=LI_bk...6SURupevYR0Tvw
The Race Truck

https://www.youtube.com/user/THEmadmikeismad/videos

01 Ram 1500 Sport 4x4 5.9 (RIP Big Blue )
madmikeismad is offline  
#10 Old 07-22-2010, 08:38 PM
cmns2500
Sen๓r Member
 
cmns2500's Avatar
 
Join Date: Oct 2008
Location: Houston-ish
Posts: 17,165
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i already got 32's mang and that's about all that's gonna fit under there haha....

my 02 w/ 35's would do about 80 at 2k though

CJ AKA Homie Mango


02 Taco
cmns2500 is offline  
#11 Old 08-24-2010, 09:12 PM
RamVanMan
RamVanMan
 
Join Date: Oct 2005
Location: Nacogdoches, TX
Posts: 594
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hey Dodge98Cummins:

Still reading the mail here on this thread ?

I have almost your exact truck only a '97 CTD Manual with the 3.55 rear end AND I have the Gear Vendors gear splitter. Had it since about '01 or so.

Love it. The truck is just more versatile with it - it really helps with the highway revs and MPG.

Next time I'm out, I'll check what my revs are at 65 or 70 for you. I think about 1500 at 70 mph is what I see.

Now, are you stock on your tire size ? Measure your tire heighth to confirm, I can measure mine.

I do have the 19.5 Rickson Truck 12 ply (small semi truck / RV tires), so my diameter is a bit larger than stock.

I do enjoy the unit. Only complaint & suggestion is if you can at all - go to their headquarters in El Cajon / Santee, CA (east county San Diego) for the install. Not maybe, just make the effort. Why ?

I had mine put in on the road near Puyallup WA at Camping World.

OK now the installers / mechanics at Camping World Service dept weren't total idiots, but they did a few things 'not quite right' - understandable as these Gear Vendors units get put in a LOT of different rigs, up to & including the big diesel buses, Ford, Chev & Dodge Trucks, etc, and each install is a bit different. They admitted my truck was the first manual tranny CTD Ram they had done.

Uh-oo, can you say guinea pig ?

Turns out, over the next year or so, I had to visit the factory to have the 'minor install issues' fixed, anyhow. Twice. Not a big deal we lived near Temecula then, so a modest 90 mile drive, I'm there.

I see you are in Orange County - don't expect as good an install at a dealer, as they can do at the factory is my main advice.

The unit will make you happy, IF it's installed properly - and the actual factory is the main place for that to happen, especially since you're not all that far away.

Admittedly, they COULD have a great experienced dealer in Orange County or LA, that has a ton of experience and can do it right - you want them to have a lot of installs on 2nd Gen Ram Trucks with manual transmissions, for that to be the case.

(The tech advisor at GV factory as much as admitted that this is the case. They did treat me right there & they did fix the issue, btw)

There is also another company, I think US Gear, also offered another Gear Splitter - it worked a bit differently, and I think was 20 % less expensive.

It might be wise to compare, what have you got to loose ?

If you want to make sure I get back to you promptly on the RPM @ highway speeds #'s, feel free to PM me (I see the thread dates from last spring) so I see it quickly.

Admittedly, I spend more time in the Ram Van forums, as my Van has more issues than our truck !!

Glad I saw your post and could help. They cost $$$ gotta make sure it's a wise move.

Best Regards, David aka RamVanMan (& RAM CTD, too)

1996 Ram Van B-2500 Conversion Van - 318, Electric Engine Cooling Fan - "The Family Bus"
1997 3500 Cummins Ram Truck - 19.5 wheels, pacbrake, Gearvendors OD - "Pocket Peterbuilt"

Tyranny Rising ? The answer to 1984.....is 1776 !

"Evil is powerless, if the good are unafraid."
Ronald Reagan

"You never have to give up an ounce of Liberty to obtain security."
Ron Paul

"Stand fast, therefore, in the Liberty wherewith Christ has made us free, and be not entangled again in the yoke of bondage..." - Galatians 5:1

Last edited by RamVanMan; 08-24-2010 at 09:35 PM. Reason: clarity
RamVanMan is offline  
#12 Old 09-07-2010, 12:24 PM
RamVanMan
RamVanMan
 
Join Date: Oct 2005
Location: Nacogdoches, TX
Posts: 594
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thumbs up Back with details on RPM / MPH with Gear Vendors Overdrive.

Quote:
Originally Posted by BigCE View Post
Although I have never tried this, I would suspect that 1500 rpm would be too low a engine speed to move your truck at 65-70mph. The engine would have to work to hard thus reducing your mpg. I have no doubt the cummins could do it but I do think it would be working hard.
FWIW,

I just took my RPM / MPH readings:

1500 rpm = 65 mph

1650-1700 = 70 mph

Yes, you are mostly right. The 1500 rpm / 65 mph only works on flat or maybe very slight upgrades, but nothing steep at all.

If the road steepens, if you are going only 65 mph, you will loose MPH in the top gear of the Gear Vendors, which is 5th - OVER. (that is, normal 5th + the Overdrive gear)

What I do in that situation is, to shift down to 4th, but leave the OD switch on, so it looks like I've shifted from 5th to 4th, but I'm really in 4th OVER, which is higher than 4th, but lower than 5th.

What you end up with is a gear between each gear, but it won't work under 20 mph, so you can use 2nd OVER, 3rd OVER, 4th OVER & 5th OVER - effectively 4 extra gears.

My truck, 2500 RAM CTD 4x4 runs on 19.5 12 ply tires - General LMT 400's that are 31" tall, and I have the high numerical rear end (not 4.11), PLUS the Gear Vendors Overdrive unit.

Keep in mind our trucks have the kinda week kneed 5th gear (my trans has the factory fix for the 5th gear 'nut falls off' issue), so with modest loads or for running emtpy, use 5th OVER, and you'll have better MPG, less revs & more relaxed cruising.

For best towing strength, use 4th OVER and it's bulletproof as you're straight thru in 4th, with the Gear Vendors taking all the abuse which it is totally built to take.

I'm not sure if you're still reading this thread, but hopefully others will benefit. Any questions, post here AND send me a PM so I know you posted & am prompted to respond to your query.

Take care, CTD Ram Truck fellows,

David

1996 Ram Van B-2500 Conversion Van - 318, Electric Engine Cooling Fan - "The Family Bus"
1997 3500 Cummins Ram Truck - 19.5 wheels, pacbrake, Gearvendors OD - "Pocket Peterbuilt"

Tyranny Rising ? The answer to 1984.....is 1776 !

"Evil is powerless, if the good are unafraid."
Ronald Reagan

"You never have to give up an ounce of Liberty to obtain security."
Ron Paul

"Stand fast, therefore, in the Liberty wherewith Christ has made us free, and be not entangled again in the yoke of bondage..." - Galatians 5:1
RamVanMan is offline  
#13 Old 09-14-2010, 12:09 AM
Red Sleeper
Blowin n' Goin
 
Red Sleeper's Avatar
 
Join Date: Jun 2007
Location: Pearland
Posts: 3,688
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good info sir. Thanks for sharing.

Nick J
05 Cummins QCSB. TransGo Smarty H2O/CH4O
13 Jetta TDI 6spd auto
91 Cummins Dedicated water hauling vehicle
94 Z28 LT1 355ci 6spd Lots of Tubing
RockCrawling Dakota http://www.dodgetalk.com/forums/show...90#post4512290
www.builtwithblood.com
Red Sleeper is offline  
#14 Old 09-14-2010, 11:29 PM
Clunk
Senior Member
 
Clunk's Avatar
 
Join Date: Aug 2005
Posts: 2,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good info, thanks for sharing!

'01.5 2500 4x4 Red QC Sport HO SWB, 6spd.,cowl hood, 4" ex., Edge Drag Comp, Banks boost & pyro pillar mount, single Holley style lift pump...13psi WOT, US Gage & 4 grease gun lines for fuel pressure monitor, Power Service in the tank, Amsoil in the trans and Valvoline in the pan. Vulcan Big Line kit, Napa #2790 BHAF, cheapo fuel cooler, IP 200's, Cat C300 turbo 3.55 gears jes' like Ram3500Dually sez..., ARP studs, 507.9hp, 1050 torq.

Time to turn so's you don't burn.
Clunk is offline  
#15 Old 02-20-2011, 02:37 AM
madend22
Registered User
 
Join Date: Feb 2011
Location: orang county, cal
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
99 2500 24 valve gear splitter

i currently have a "under/overdrive" 2 speed trans, or gear splitter on my 99 2500 2wheel, utility, play & work truck. i put this on to counter out my dana 410's. still at 75mph i am tac'n 2000 to 2300 up the grap vine pullen 25 foot , usually over loaded toyhauler, with good EGT's and tranny temp. it is nice to have. it does however, depending on what kind of a load you are under shift hard, the more the load the eaiser the shift.
madend22 is offline  
#16 Old 02-22-2011, 07:20 PM
Clunk
Senior Member
 
Clunk's Avatar
 
Join Date: Aug 2005
Posts: 2,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the info madend22 and welcome to the site!

'01.5 2500 4x4 Red QC Sport HO SWB, 6spd.,cowl hood, 4" ex., Edge Drag Comp, Banks boost & pyro pillar mount, single Holley style lift pump...13psi WOT, US Gage & 4 grease gun lines for fuel pressure monitor, Power Service in the tank, Amsoil in the trans and Valvoline in the pan. Vulcan Big Line kit, Napa #2790 BHAF, cheapo fuel cooler, IP 200's, Cat C300 turbo 3.55 gears jes' like Ram3500Dually sez..., ARP studs, 507.9hp, 1050 torq.

Time to turn so's you don't burn.
Clunk is offline  
#17 Old 02-22-2011, 08:19 PM
madmikeismad
R.I.P Big Blue
 
madmikeismad's Avatar
 
Join Date: Sep 2008
Location: Moore OK/WNY/Johnson City
Posts: 4,798
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
How do these things work? Do they actually take over for the overdrive in the trans? How do you engage/disengage the GV unit?

Mike Hill
Sometimes I laugh so hard, the tears run down my leg.
Purple People Eater - 98 12v http://picasaweb.google.com/mch8223/Diesel#
623hp with a gate that won't stay closed: http://www.youtube.com/watch?v=LI_bk...6SURupevYR0Tvw
The Race Truck

https://www.youtube.com/user/THEmadmikeismad/videos

01 Ram 1500 Sport 4x4 5.9 (RIP Big Blue )
madmikeismad is offline  
#18 Old 02-22-2011, 11:14 PM
Bluedually4x4
Registered User
 
Bluedually4x4's Avatar
 
Join Date: Jul 2009
Location: Casper
Posts: 543
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The easy way to explain it is..

Think of it as a second transmission. Totally independent of the main transmission. They bolt to the output of the trans on a 2wd or the output of the T case on a 4wd. You can't split gears in 4wd, kind of a bummer. Its kinda like a reverse transfer case. It has an over drive instead of a reduction.

They can operate automatically or when you tell it to.

1998 1 ton dually 4x4. 12valve Cummins 5 speed manual. TST # 10 fuel plate DPI 75 hp injectors ATS 3 piece exhaust manifold BHAF intake 5" Turbo back exhaust dual 5" stacks South Bend 13.5 clutch 2001 flip out towing mirrors 16 degrees of timing and 3000GS BD Super B turbo
Dynoed at 452 horse power
And over 900 foot pounds
Bluedually4x4 is offline  
#19 Old 02-23-2011, 12:29 AM
madmikeismad
R.I.P Big Blue
 
madmikeismad's Avatar
 
Join Date: Sep 2008
Location: Moore OK/WNY/Johnson City
Posts: 4,798
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thats what I thought, but someone mentioned turning overdrive off, and I wasn't sure if they meant in the trans, or the GVO, then I thought maybe they were combined.

Mike Hill
Sometimes I laugh so hard, the tears run down my leg.
Purple People Eater - 98 12v http://picasaweb.google.com/mch8223/Diesel#
623hp with a gate that won't stay closed: http://www.youtube.com/watch?v=LI_bk...6SURupevYR0Tvw
The Race Truck

https://www.youtube.com/user/THEmadmikeismad/videos

01 Ram 1500 Sport 4x4 5.9 (RIP Big Blue )
madmikeismad is offline  
#20 Old 02-23-2011, 12:33 AM
madend22
Registered User
 
Join Date: Feb 2011
Location: orang county, cal
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
gear vender on off

they installed a manual -automatic on off switch down next to heater box and trailer break and installed a button on floorboard under the carpet, like a hi beam light switch. their are several ways to use it. you can manuel threw your gears starting in 1st step on button 1st1/2 step on button shift 2nd step on button 2nd1/2 and so on. or o/d off for me with 410 rear end, g/v is on around town. get on highway o/d on soon as i hit 55 60 at about 2000 rpm step on button truck lunges takes off to 75 80 rpms 2000. as soon as truck comes to a stop g/v will turn off if it is on manuel. if on auto it wont ingauge untill last gear. hope that helps hard to explaine in writing and i suck at using a computer
madend22 is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now

In order to be able to use most of our features, you must first register.
Please enter your desired User Name, your Email Address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
The registration process requires you to activate your membership by following a link in an E-Mail that will be sent to you immediately upon completing this form. You must enter a valid email address or you will not receive this activation code and you will NOT be registered. Your E-Mail address is NOT publicly available to anyone as policy.

AOL E-MAIL USERS: Please click HERE for important info pertaining to your e-mail address.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear Locker suggestions for 5 Spd '98 12 valve 2 Wheel Drive dodge98cummins 2G Dodge Ram Diesel Talk 7 05-22-2010 08:29 PM
Gear splitter? Bluedually4x4 2G Dodge RAM - Drivetrain Talk 6 08-07-2009 03:42 PM
Locking in 3rd gear - 5 spd auto daverg1 3G Dodge RAM - Drivetrain Talk 4 07-15-2006 06:48 PM
Understanding 5-spd vs. 4-spd automatic Transmission DW Flor 3G Dodge RAM Diesel Talk 5 06-18-2006 08:15 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome