I bought a Ralleye 350 last year in parts. It has been off the road since 1980 The odd thing about it is that it has a 12 bolt 4.10 or 4.11 rear end in it. We found this out while it was on the lift and marking the tire and watching the shaft turn. Can this be correct?. If so what letter code would it be?? I also noticed this car had a rear bumper trailer hitch and air shocks on it. Could this car have been ordered out with this gear? Thanks for any help. Also I NEED A COMPLETE OAI AIR CLEANER SET UP. Jim

 

That gear ratio was not available in an Olds that year, your closest choices would be 3:91 or 4:33.1.

 

3:91 would be a SJ for non W30, Non W27 rear end, and TY for the 4:33's. 4:66 & 5:00.1 were available as dealer installed.

 

Thanks for the info . I'll start checking the axle tube for those codes. Jim