Gear Ratio ???

[C-10 simplex]

Originally Posted by gregg72340

Not to even remotly try to hijack this thread but where do the early 350 diesels play into this? Would the basic small block application apply here? I just picked up a free 12 bolt from a diesel but havent had the time to check the ratio yet and would definitly like to get rid of my 2.73's

1) i did not read carefully---you are referring to the oldsmoboggie diesel, not the 6.2?
You got, get this----2.76 standard code HC2, 3.08 would be code HE3, and if 3.40 then code HE4, not sure if posi also comes with HE4 These are very strange ratios.

i'm not sure if these are dependent on GVWR's and the early diesel trucks had a crapload of them.

Would it be out of the question to take the cover off and physically count the teeth? The oil could probably use a changing anyways.

Originally Posted by LONGHAIR

I doubt that you will get much "fun" out of a 2.50 first gear with a heavy pick-up truck? You really need a lower rear end gear to make it more drivable, but that creates highway RPM issues.
These "performance car" transmisions just don't have a wide enough gear spread for trucks as an "all around" daily driver. The generally taller tires of a truck make it worse.

2) To me just banging thru 3 gears is fun. But yes, if you wanted better acceleration then maybe 4.11 would be better but then mpg might suffer.

3) i can't make any further "recommendations" for rear end ratios (esp when coupled with 4sp) because i'm not really qualified to----i'm trying to figure out my own situation as well.

i do, however, feel that riding a 10sp bike can be very educational----general consensus is that a taller ratio would take less "energy" to turn, but this is often not the case.