Which transmission in 85 D150 318? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 08-25-2005, 11:23 AM
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Which transmission in 85 D150 318?

I have decoded the Vin of my truck, and still cant figure out which transmission I have. i have the part numbers from the transmission. PK4058398 8697 7696 I am not wanting to rebuild, but completely replace this transmission. I believe it is an A999, but I am not sure. I would love to replace it with a auto(4 spd) 727, but I dont know if it has the same bolt pattern and if i would need a computer from another truck. Or if this 85 Ram even has a computer. Any help is appreciated.
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#2 Old 08-25-2005, 04:45 PM
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You could have 3 different transmissions. The A999, A904, or the A727. There may be a sticker under the hood that tells this.

BTW, the A727 wasn't a 4spd..that was the A518 that came out in the late '80's. It's basically an A727 with OD.

All smallblock Torqueflites had the same bolt pattern. Slant six and bigblock patterns were different.

You may or may no have a computer. Back in the early 80's Dodge added Electronic Spark Advance or "ESA" On the left inner fender well you might have a black box that has a vacuum advance on it...that's the ESA computer. Easiest way to tell is to look at your distributor. Does it have a vacuum advance? Yes...then you don't have ESA. No...than you DO have ESA. Those ESA units are nothing but trouble..most people remove them and swap in a traditional Chrysler electronic ignition system.

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#3 Old 08-26-2005, 01:45 AM
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Thanks for the info. I did see in a summit racing catalog a 727 4 spd auto, but I cant recall the manufacturer. Sadly the tag from under my hood is missing, so no easy ways to tell which tranny I have. Thanks for the help on clearing up the bolt pattern...

~~~~~~~~~~~~~~Joschmo86~~~~~~~~~~~~
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#4 Old 08-26-2005, 01:57 AM
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Also, since i am goign to replace the transmission with a new one, which model has the best reputation for durability and strength. I dont tow often and want a good highway gear. If its easiest I'll go with another 3 speed Auto but get a higher(lower numerically) rear diff gear ratio.

~~~~~~~~~~~~~~Joschmo86~~~~~~~~~~~~
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#5 Old 08-26-2005, 07:04 AM
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The A727 is the "King" of the automatics as far as I'm concerned. What ratio are you running now? I wouldn't go much higher than 3.23 gears

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#6 Old 08-26-2005, 04:27 PM
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the number u gave 4058398 is a good mopar number.the trans number is a a999 w/long extension w/lock-up.the trans is now discontinued.
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#7 Old 08-26-2005, 05:23 PM
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So should I try to keep it and get it rebuilt or would the parts be too rare to easily come across? I would like to do the rebuild myself, but I dont have the tools required really. I just like to learn hands-on things. A727 transmissions seem to be very common, and I have found upgrade shift kits for them. What would you all personally do? Thanks alot for the help!

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#8 Old 08-26-2005, 07:00 PM
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Personally I would go with the A727. It's stonger and parts are more common. The A999 is a heavy-duty version of the A904, but still not as stong as the A727.

The A727 is a larger transmission overall, but with a truck you shouldn't have to modify anything. Just to be on the safe side, I would go to a junkyard, find a truck around the same vintage as yours with an A727 and grab the trans. mount crossmember.

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#9 Old 08-27-2005, 07:15 PM
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Thanks alot for all of the help so far. I am looking at getting an A727 from summit racing. I believe it was built by TCM transmission Co., though I am not 100% sure. I'll keep this thread updated on what progress I am making.

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#10 Old 09-01-2005, 04:45 PM
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Just a note, the 904,998,999 has a smaller output shaft than a 727.
If the donor truck has the same U-joint as your truck, grab the slip yolk from the 727 equiped truck, better yet, check the legnth, the 999 may be shorter than the 727.
If you find a 360 truck 727 the trans will work but the torque converter won't work on your 318 because of the 360's ballance weight.

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#11 Old 09-10-2005, 06:43 PM
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Wil the torque convertor from my 904 trans work with the 727 transmission? Just a hope(doubting it though). I will be buying the 727 new(rebuilt) from TCM(via Summit racing). I guess I can buy the 727 tailshaft off ebay or a salvage yard here.

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#12 Old 09-10-2005, 09:26 PM
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The torque converter is different between the 904-999 series and the 727s
there is also a difference in 727 converters, the 727s that are newer than about '78 have a lockup clutch in them and they are not compatible with the older trans.
There are 2 bolt patterns on the flex plate too, one for the 11 3/4" (standard stall) and one for the 10 3/4 inch (higher stall) converters.
I hope this helps.
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#13 Old 10-10-2005, 01:44 AM
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About time!

I finally have the time and enough money to start the project. Heres what I am looking at TCI Sizzler

I will be getting a new torque convertor since its for the 67-79 non lock-up and possibly a new flex shaft. Heres the list...

*TCI 727 trans
*TCI Sizzler Torque Converter
*Trans output shaft
possible shortening or lengthening of the driveshaft.

~~~~~~~~~~~~~~Joschmo86~~~~~~~~~~~~
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#14 Old 10-10-2005, 04:27 PM
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The only other thing I can think of is maybe a cross member for the 727.
Be sure the torque converter is balanced correctly for your motor. If your old TC has a balance weight you will need to purchase a B&M balanced flex plate or add weight to your new TC. Chrysler Performance Parts used to have a balance weight kit, I'm not sure if they still do. We just did a '77 360 and I used the B&M flex plate setup, now I can use any TC behind that 360, it has all 3 TC bolt patterns (Large, Small and HEMI [small bolt circle with a bigger bolt]). If you go with any higher stall than stock you MUST add extra trans cooling.
Good luck.
Scott

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