2.73's and 10bolt
 

I'm about to do h/c on my car and was thinking about doing a gear change to a 3.42. How much longer would my 2.73's last than the 3.42's. And what kind of mph difference would i be seeing at the track.

Get a Bigger stall, but if you must do the gear change your 10 bolt wont last long with 3.42s and the mods you are gonna have on top of that. I would suggest savin up for a 12 bolt rather than doing a gear change.

This is going to be my DD at some point so I think I would lose some driveablity if i went to a 4k stall.

youll lose more changin gears, your gas mileage will take a huge hit, and you have to worry about blowin up your rear end

I agree that the 7.5 10 bolt isn't worth spending much money on. If you keep your eyes open you can pick up another rearend for a couple hundred bucks. I have saw a couple sell locally for as little as $100. Keep your 2.73 stocker in the garage as a spare. I just bought a 3.73 geared unit with 50,000 miles for less than the cost of new gears and a install kit, not to mention paying someone to set them up.

Thats what i was thinking of doing, just swapping the whole rear out and saving my 2.73's like you said. This way if I grenade it, I always have my 2.73's to fall back on.

Yeah try to save your 2.73 rear end. When I talked to my rear end guy about a gear change, he told me its not a good idea to put 3 series gear sets in a 2 series carrier in the 7.5" GM 10 bolt. He told me he would do it but I wouldnt be happy.

What is it that would make you unhappy?

I thought that unless your changing the actual gears out then there might be conflict.
I'm going to change the whole rear out with a 3.42

well I have a 02 camaro a4 and it came with the 2.73s, the downside 2 keeping your 2.73s is that you will put alot of stress on your trans and it will eventually go. do the gear swap and select a good stall (vig or yank) and balance everything out. BTW Strange sells thicker gears u can use with your 2 series carrier. Good Luck

See you already have a stall but I would personally do the gear swap...if you are a track fiend save up for the 12 bolt and do the H/C and 12 bolt at the same time. The ten bolt is weak but there are lucky guys out there running in the 10s with them :eek2:....Good luck

My 2.73's held up to a 410 RWP H/C combo with a TNT Wet kit at 250 right out of the hole. Stock rear only added a Alum cover.

Car went 11.082 @ 123 on the spray (car went through traps in 2nd trans wasnt wanting to shift)

Josh

crossed the line on the rev limiter at about 6900 trans was stuck would not shift even when i let off.