[special-K]

Originally Posted by Mike C

Tim, My ‘72 Jimmy is a factory 4 speed 350 and came with 3.07 gears. Or am I just not understanding this? The 350 V8 came with 3.07 regardless of transmission choice standard with options of 3.73 and maybe 4.10 in the half ton.

OP, I haven’t seen anybody else say it, but if you change the rear gear ratio in a K truck (4x4) you have to change the front to match. Several people have mentioned the 3.40/3.42 gear, but I don’t think you can get that ratio in a Dana 44 gear set for the front.

Unless someone has removed it, the Dana 44 in the front should have a ratio tag specifying what gear is in it. And if it is anything other than what that engine combo came with stock, it will be an option on the SPID.

The fact I was focused on in my comment on Casper's post is that 4.10s were also available, not only 3.08s & 3.73s. I'm not sure what ratio came standard with 350 w/MT. I always thought back then the 3.08s were standard for AT. That's what I recall in what I've owned. After looking, I see MT came standard with 3.08s as well... yuck. That option pricing list shows the price for all three ratios for given engine/trans. I'm more a from personal experience guy than putting all my faith in texts... right or wrong. I've seen too many exceptions. The red K/10 I showed had 4.10s and that price guide shows "C10 only". That truck was the coolest optioned truck I ever owned or saw. It started a lot of arguments until the skeptics were shown the obviously original SPID. I wish I knew where that truck is now.

I spoke of 3.42s for the rear in my '67 C1500. I like 4.10s in a 4wd, or maybe 3.73s in one for hiway use

Keith, I'm getting a blank page from your link