Hello guys, currently running stock transmission and stock rear end on my 1987 Monte Carlo SS...I have recently upgraded my motor from the stock to a 350 small block...putting out close to 400 hp....can anyone help me out on which trans and rear end to upgrade to? I drive the car regularly in the summer. Not so much strip/street/race action but I'd like it to be there if I needed it.any advice would be helpful. Thanks in advance.
transmission & rear end upgrade
- Thread starter Midwestmonsta262
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I went with an 8.5 in rear end from a Grand national. They can get a little expensive but a stock rear I've seen hamdle 500hp . Direct bolt in.
Transmission is up to you but if I were you I would upgrade to a 4 speed while at it. I went with a turbo 350 and 373 rear and I don't necessarily love driving it on the freeway lol
Transmission is up to you but if I were you I would upgrade to a 4 speed while at it. I went with a turbo 350 and 373 rear and I don't necessarily love driving it on the freeway lol
X2. My vote would be G body 8.5 and a built 200-4R overdrive if you want to stay automatic. You could build a 9" rear cost effectively, starting with an aftermarket housing that will bolt right in.
You could also just upgrade the 7.5 at that power level. Put in a 28 spline limited slip differential of your choosing and 28 spline axles and it will be plenty strong for the street.
You could also just upgrade the 7.5 at that power level. Put in a 28 spline limited slip differential of your choosing and 28 spline axles and it will be plenty strong for the street.
you should have the 7.625 carrier with 28 spline axles so in addition to building up the 200 4R all I would do is switch the carrier to this....
http://www.eaton.eu/Eaton/ProductsServices/Vehicle/Differentials/detroit-truetrac/index.htm
http://www.eaton.eu/Eaton/ProductsServices/Vehicle/Differentials/detroit-truetrac/index.htm
IF you go to an 8.5 I believe you will need a 1" shorter driveshaft, or the driveshaft from the vehicle with the 8.5
28 splines in the 7.5 / 7.625 came after the G-body in 1988, I say after, in that none of them I have ever scene had the 7.625 or 28 splines in a 7.5 or 7.625 from the factory.
Side note: These were strong enough for LS1 powered Camaro and Firebird
Side note: These were strong enough for LS1 powered Camaro and Firebird
I always thought the 7.625 (NOT the 7.5) that was in the montes started in 84 when the SS came back out and always had 28 spline axles?
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