Speaking of final drive ratios and transmissions and all that good stuff........ I believe my final drive ratio is 4.05 and the transmission is a MU3/F35/LSD saab designed chevy built 5 speed....now I was readin' where there are actually 2 transmission that are in the SS and identical except for the drive ratio.....If I read correctly my transmission is a MU3/F35/MC2........ it's got me confused and my head hurts.

 

both 5spd hhr ss have 4.05 finals, the auto does not.

 

I hear Jaxon..... but is the MU or MC? I guess only Chevy would know.
(this all came 'bout when I was researching the transmission mounts that are used in the Balt SS and the HHR SS)

 

they are the rpo codes, m3u is for the 5spd, mc2 is the non lsd. that's if I'm correct, but basically that's a good explination.