Does my 4wd take the same 8.5" ring&pinion in the front as the rear?I have 2 sets of 4.10's 8.5 10bolt from older trucks.

 

I'm not sure, but it sounds like its def. worth finding out, by the times in your sig, the 4.10s ought to help that time quit a bit. If the gears end up not working I would prolly go 4.30's or 4.56's . you got the mph for low 15's, just need the gear to do so.

 

it's the same

 

For the front, GM used the 8.25” with a reverse cut ring gear in the 1988 – Current ½ Ton trucks. For the rear, GM used the 8.6” with a standard cut ring gear, which actually has an 8.5” ring gear in the 1999 – Current ½ Ton trucks. What separates the 8.5” and 8.6” apart are the bearing sizes and not the ring and pinion. Both differentials front and rear have 30 spline axles. Basically, you could use one of the sets you have in the rear, but not the front.

 

thank you

 

not trying to jack the op thread but just a quick question. what et gain to people usually see going from 3.42 to 4.10?

 

i didnt see anything.
i picked up on MPH and DD ease.

13.0 @ 103.8 with 3:42s
13.0 @ 104.2 with 4:10s bump shifting so hard it chirped 2nd gear.

 

wow thats strange.did your 60' change?also I found a GM website for the front gears for $280 they list for $460 so I might stay where I'm at.

 

i ran a 1.84 on 3:42s and a 1.82 on 4:10s but its all in converter for the 60' considering my cam doesnt really pick up until 3300ish or so.

 

he didnt see change... but he was heavily modded... it will wake up a stock truck... i gained a half a second going from 3.42s to 4.10s in my old 4.8L