Hi I just picked up this rearend to swap into my 88 firebird up for only $60 and was wondering if they are any good, i know its a posi but dont know the ratio any info is appreciated

 

If the rear is a 10-Bolt, check here:

https://www.thirdgen.org/forums/tran...-10-bolts.html

If a 9-Bolt, check here:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

 

Ok its a tpi 305 5.0ho auto 86 trans am 9bolt with 3.27 so it should bolt right up to my 88 tbi 305 would there be any good difference to the swap other then the luxury of 4 wheel disk and limited slip? i dont race or get down on my car at all

 

Yes, it'll bolt up, though you'll need to consider a disc combination valve for best brake performance, parking brake cables, and probably drive and/or driven gears for the trans if you want the speedo to read correctly. All good if you wants discs (though the standard iron Delco-Moraines aren't the best), L/S, and a better gear ratio.

JamesC

 

Thanks for all the help but im having a hard time figuring out what drive and driven gears to use i tried figuring out through the stickie but have no idea.. and as for the disc combination valve would i be able to add it later on after the swap?

 

Yes.

JamesC