Stock rear end ratio?

[retirednak]

I have a '96 Caprice LT1 that is getting ready to be tuned by pcmforless and I need to know what the stock rear end ratio is. Also, anybody had pcmforless do a tune on a stock engine and noticed any changes? Thanks for the help!

[IMPALADAKID]

2.56, stock (GM8), 2.93 tow package (GW9), and 3.08 9c1 or impala ss (GU4). The spid lable in the trunk will tell the story.

[retirednak]

Thanks for the help:LS1LT1flag:

[KW Baraka]

Stock rear end ratio......I have a '96 Caprice LT1.....

If they have the stock gears in them, then you have 3.08 gears.

BTW......not all 9C1's have the 3.08 gears!!!

A 9C1 with the 4.3 engine has 3.23 gears.

KW

[mrcadillac]

Thats true, but if it's a Civi Caprice SEDAN with an LT1(aka, the towing package), it has 2.93's. I also think the 4.3L Sedan's had 2.93's a well, but with the 7.5" rear. On a Wagon, 2.56's were standard, unless it had the towing package, then it got 2.93's.

[BiG 96 DcM SS]

Do you think 3.23 would be good gears on a 96 impala ss or go with 3.73

[KW Baraka]

Do you think 3.23 would be good gears on a 96 impala ss or go with 3.73

3.23 gears are barely noticeable.....been there, done that :cool:.

3.42 gears are a bit more noticeable and is actually a worthy upgrade.....been there, done that ;).

3.73 gears are generally considered to be the 'best' gear for a performance oriented daily driver.......been there, DOING that in my 9C1 :cool:!

4.10 gears with the auto tranny and you start to get into the 'all-out' racing mode......been there, DOING that with the SS :lol: :lol: :lol: .....Woo-Hoo!!!!!

FWIW, of course.......just one man's opinion!

KW

[BiG 96 DcM SS]

Not bad i got a quote for 600 to get a set of 3.42 thats with installation and all new seals

[AdioSS]

if you have 3.08s, then go up to 3.73s or steeper, or don't waste your money.

[mrcadillac]

I would replace the posi while you are at it. They are not known for lasting a long time. My DCM roadmaster has 80k on it, and the stock posi is showing it's age already.

I went with 4.10's, and an Eaton in my Caprice. Love it... I'm doing the same to the Roadmaster.

This is the cheapest place I have found for all the parts. Also note, that if you change the ratio, you will need to get a special ABS reluctor for the ratio, or else the ABS system won't work.

http://www.focuztech.com/xcart/product/Eaton-posi-ring-and-pinion-kit-for-Impala-SS.html

labor to install it should run about $200-$300, unless you have the means to do it yourself. wouldn't suggest it unless you like taking on a tricky job, and have all the right tools. I did mine, but I was missing a few key tools, and that made it a BITCH to do.