would going from 3.10 to 3.73 help this...

[wraenking]

i swapped in 3/4 ton axles with 4.10's on my blazer, but my buddy just bought a 91 in mint condition, we put a 4" lift with 35's on, and he had to floor it to get to 60.,so he bought some 33's. didnt help much

if we swap in my old ones with 3.73's, will he see a difference?

 

[Z3PR]

i swapped in 3/4 ton axles with 4.10's on my blazer, but my buddy just bought a 91 in mint condition, we put a 4" lift with 35's on, and he had to floor it to get to 60.,so he bought some 33's. didnt help much

if we swap in my old ones with 3.73's, will he see a difference?

I would think so.

 

[divorced]

What gears does he have now?

 

[wraenking]

i believe 3.08's? i know its like the lowest they put out i think. why anyone would have bought that to begin with is beyond mne. my front axle is fine, my rear has something broken in it which i hope is an easy fix. just took some pics nas=d will post them soon.

 

[wraenking]

well heres the pics of my rear witht he 3.73's, and now we al know why i was forced iinto doing my swap early.

i think its fed.

 

[clarkjw24]

Maybe hook up with this guy if he's close enough. These should straighten your friend out. http://67-72chevytrucks.com/vboard/showthread.php3?t=146888

 

[pauly383]

I went to 3.73 from 3.08 on 33's ( cheap ) and it made a world of difference . I can drive around in overdrive now , and the gears don't downshift much on most normal freeway grades anymore

 

[wraenking]

any thoughts on how the gears look?

 

[Blue85]

Oh the gears look great! Just keep everything moving so you don't get stuck on the missing tooth (teeth?). Make sure when you stop you have just passed the "click" from the rear end so that your diff isn't in neutral the next time you want to take off.

A little JB Weld and some new gear oil and she's good to go.

 

[Blue85]

As to the original question, 3.08 to 3.73 would definately help. In fact, 3.73 is a reasonable ratio for 33's. 4.10 might be better, but 3.73 is useable.

Still, a 90 should have a decent TBI 350, so if it won't go over 60mph, then something else might be wrong. Even if you find that other problem, the proposed gear swap is STILL a good idea, so you can't lose.