sittinlovely

iTrader: (20)

i have a automatic 2000 trans am. i want to go with 3:73. what all would i need to switch over. i also have a question about 12 bolt rear ends. what would i have to do to make it a 12 bolt. i dont know anything about rear ends so any info you guys could give me would help alot. thanks

BlackScreaminMachine

iTrader: (17)

Well, I hear you on the knowledge thing, don't worry about it.

To break to down, simply. You are asking 2 entirely different questions.

Feel free to ready the stickies up top as they provide a wealth of information.

Moving forward, to change your gearing in the stock 10 bolt rear. You need to either contact a performance shop and they can guide you, or get someone local who is good at rear gear swaps and buy the parts.

Question: Does your automatic has a selection for 1st gear?? Or after "D" can you do down one click more. As if I recall the cars with 2.73's had a different carrier then those with 3.23's and that would matter when doing a gear swap in a 10 bolt. I myself never bothered as they are weak rears and I moved on to swapping in a 12 bolt.

Now, you cannot convert your 10 bolt into a 12 bolt, its a major investment that is over 2500$ to do so if you dont have the scratch, then do not worry. Focus on buying a install kit, gear set, oil, differential additive (GM only), and give the parts to a qualified mechanic and have the PCM reporgrammed.

sittinlovely

iTrader: (20)

yes, my gear selection can go into 1st, thanks again for your time

BlackScreaminMachine

iTrader: (17)

Ok, then you have a 3.23 stock. Basically check with sponsors for a gearswap and kit.

http://www.thunderracing.com/shop-by...-Install-Kits/

Notice where they say 2 series and 3 Series. You have the 3 Series.

Have fun!

Also!

http://www.thunderracing.com/shop-by...and-Additives/ You can and should use NON synthetic rear gear lube but if you have a Posi you need this at the bottom of the screen.

Bob@BruteSpeed

iTrader: (16)

https://www.brutespeed.com/rear_end_information.htm

I have a lot of information at the above link that might help you out. Bob

BlackScreaminMachine

iTrader: (17)

FYI Bob is a great guy, all sponsors here will help you. Feel Free to PM them.

sittinlovely

iTrader: (20)

Thanks a lot for the help

1Bad97WS-6

iTrader: (3)

My shifter selector I can go to 1st gear and my door has GU2 so I have a 2 series carrier with 273s..