Over this past weekend I did a little swapping from my factory 3.23 gears and dropped in a set of Motive 4.10 ring and pinion, a strange 28 spline posi unit and 2 brand new Moser axles. By far the best investment I've made on the car. I'm running these with a 700r4. so at 65ish I am running around 2400rpms. Also with this swap I picked up 1.5 seconds at the strip this weekend as well. I am now into the 13.9 bracket. It run 13.90 @104. So for anyone out there debating 4.10s or something other, they are definitely worth it.

 

I'm trying to decide between 4.10's and 3.73's in anticipation for when I install my T56. Hearing some horror stories though about the 4.10's easily breaking under harder abuse do to being thinner. I think they'd work a lot better though with the 6-speed. Glad to hear you're enjoying them!

 

i have 4:10's (gm gears) in my v6 turbo car with over 340 rwhp and 450+rwtq the thing dead hooks on a 28x10.5 slick needless to say the 4:10's have been in that car for many years never broke, i did on the other hand bend and twist a lot of axles also had a spool in the rear end

cars an auto though

with a stick if u dump the clutch and u have sticky tires on it the chance of them breaking goes up alot from the shock abuse


on the other hand i have seen guys with an auto and less power break them very easily , anything in the 10 bolt is a gamble , some never break , some last a while others break the first time

 

When I was making my decision with the 4.10 gears I was thinking that I didn't want to leave anything out there. I kinda felt that if I went with 3.73's that It would keep me wanting more. But I was also considering getting a set of 4.56's lol. With my 700r4 it's pretty sweet. I no longer feel the want to have a manual trans. The take off is amazing.

 

Very true...went 11.9's in my old '84 Monte SS with 3800 stall, GM 3.73's & PowerTrax Locker in a 7.5 on 275/60 Quicktimes and 12.7's in my old '91 Z with 3.73's and a TKO 5-speed running 255/50/16 BFG Drag Radials. Don't recall the brand diff, did chip a couple teeth once but replaced with Richmonds and never had an issue.

I doubt this car will ever see slicks although I am running 315/35/17's on back and would like to do some road course/track days with it eventually. Read some storys of the 4.10's shattering b/c of the thin ring gear. 3.73's are nice, but feel the 4.10's would really compliment the T-56.

One of the big mags (Hot Rod, PHH, CarCraft) did an article on best gears for 3rd gens back in the early '90's with a 5.7/auto GTA. They claimed 3.73's provided most consistent times vs 4.10's b/c the car became too squirrely and unpredicatble when combining the 4.10's with the steep 1st gear of the 700R4. I'm sure with practice this could be easily overcome though and bet the launch is pretty awesome! I think 4.56's, even 4.30's, would be pretty over the top, especially in a TPI car. Regardless, I don't see me losing my desire to put in the 6-speed!