Gear ratio help

[Montecarlo79]

Pulled diff cover plate off because I have to change yoke seal it’s leaking, and the part shop said they need to know what the ratio is, I see with paint marker someone put 82 on the big gear and the small one in the back you can see in the second photo says 1x18, could someone help?

 

[stew86MCSS396]

I’m thinking there should be some kind of stamping as those painted don’t make much sense. Pic may/may not apply.

 

[Montecarlo79]

I’m thinking there should be some kind of stamping as those painted don’t make much sense. Pic may/may not apply.

Found out it’s a 3.08 I keep seeing everywhere where people are saying that’s a bad ratio and for what I got a 3.42 is better

 

[Montecarlo79]

View attachment 255639Found out it’s a 3.08 I keep seeing everywhere where people are saying that’s a bad ratio and for what I got a 3.42 is better

Sorry 2.73:1 gear

 

[Montecarlo79]

Sorry 2.73:1 gear

I did more research, so the code on my diff says that it should have 41 ring gears and 15 pinion, I counted 41 like so but my pinion was actually 18, so it ends up being 2.28, which in reality isn’t the greatest for what I built for a motor, being a 350sbc with a 650 eldebrock, a xe262h comp cam and having longtubes, but I’m only running 1800 stall on my th350 so this isn’t really any performance, I just want a ride that has some good street use

 

[86LK]

I did more research, so the code on my diff says that it should have 41 ring gears and 15 pinion, I counted 41 like so but my pinion was actually 18, so it ends up being 2.28, which in reality isn’t the greatest for what I built for a motor, being a 350sbc with a 650 eldebrock, a xe262h comp cam and having longtubes, but I’m only running 1800 stall on my th350 so this isn’t really any performance, I just want a ride that has some good street use

many of the gbodies came with low ratios. you'll need at least a 3.23:1 to get decent performance. these were 7.5" rears, but you can also use gears from 7.625" which were primarily in the S10 and the Camaro. that will allow you to get a higher ratio than 3.23

 

[jcelk]

you need a posi with some better gears stay away from a gov lock unit they nicknamed them gov bombs .it depends on your trans is it overdrive or not and if you want to cruise down the highway without turning a lot of rpms you got some reading to do

 

[Clone TIE Pilot]

The OP says he has a TH350 transmission which limits his gearing choices. With a non OD transmission you don't want a gear ratio lower than 3.42. With an OD trans you can go futher like 3.73.