[Speed Dragon]

That's only 500 revs, could still be the lock-up. If it kicks in and out of OD that much, it has problems.

 

[Speed Dragon]

833 is a manual trans. Also, I bet what you think is the OD on your grandpa's truck is actually the lock-up in the converter. Unless your grandpa drives at like 45mph all the time Then it will go in and out of OD.

Also, remember on an auto you have converter slippage, which raises the rpm by a couple-few hundred rpms.

 

[Speed Dragon]

Speed Dragon: What size tires do you have on your '93? I noticed you have a 3.55 pinion.

235/75/15. Dunno what the rpm is on the highway as I have no tach, if I had to guess I'd say around 2500 at 70-75 mph. I can downshift to 4th at 70 and stand on it, and it picks up pretty good

Edit, found my trans ratios:

93/up Dodge
First Gear 5.61
Second Gear 3.04
Third Gear 1.67
Fourth Gear 1.00
Fifth Gear 0.73
Reverse 5.04

Using a calculator, puts my 75mph rpm at about 2200-2300.

 

[Speed Dragon]

Dude, go 3.55. You won't like the 3.23 w/ those big tires and the OD tranny.

 

[Speed Dragon]

I'd go 3.55 at least. I like the 3.55's in my '93, great street gear.