Lou's1966442

I have a 1966 F85. The rear isn't limited slip. I have the opportunity to purchase a posi unit from a 1975 Transfer Am. I plan to do a mini tub, and narrow the rear accordingly. My question is...would the 1975 rear be suitable, or should I implement an Eaton or similar posi unit? My knowledge is very limited, hence the question. Thanks in advance for any responses.

joe_padavano

The TRANS Am has an 8.5" ten bolt "corporate" axle and leaf springs. Your 66 could have come with either an 8.2" axle or a Type O axle. The only certainty here is that NOTHING from the T/A axle will fit. You can't even use the entire housing, since the center section does not have the ears for the upper control arms.

Lou's1966442

Precisely why I joined this community....for knowledge such ad yours! Thank you so much for your response and information! Could you help me with identifying the rear in the car? Is 8.2 any good? Can it be converted to posi? Thank you sir!!!

. Also, same questions would apply to the "O" rear.....

Toocool

Yes your rear can be converted to "posi". An 8.2 isn't real strong but if you are running an auto trans and aren't making crazy horsepower it will hold up pretty well.

Lou's1966442

How do I identify which rear I have?

Lou's1966442

Lou's1966442

. Horsepower will not exceed 600.

cdrod

Lou:
I've attached a pdf document that compares the 8.2 BOP rear end to the 8.5. It also discussed the differences in the 8.2 rear ends for various model years. I hope this is helpful to you.
Rodney

Lou's1966442

Thank you Rodney! I'm sure the information will be quite valuable.

zeeke

Interesting, I've learned something new today. Thanks Rodney.