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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> which rearend?
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Topic Review (Newest First)
02-02-2006 06:34 PM
M&M CUSTOM Contrary to some rumors, the A-body cars of that era would have had 8.2's even behind the 396 with an automatic transmission.

The manual transmissions were more apt to receive the 8.875 inch 12-bolt, but not every one of them did.

The 8.5 inch came out in production in some 1972 cars, and completely replaced the 8.2 for 1973.

The 7.5 inch 10-bolt came under the Monza and Vega when it first came out.

The SS did NOT automatically come with a limited slip differential either.

These were options and had to be ordered.

This information is published in several books documenting the stories of Chevrolet's SS cars, Chevelle, Elcamino, Nova, and Camaro.

The main difference in the 8.2 and 8.5 now, is the availability of many more parts for the 8.5 since it is still in production with some improvements over the first years, and since there is much more available for it, the prices are usually quite a bit cheaper.
02-02-2006 05:01 PM
cameano didnt know that, thanks. So how worthy are 8.2's of handling the amount of power i'm looking for? would it come out cheaper to buy an 8.5 all ready to go?
02-02-2006 06:20 AM
jimfulco A '68 w/307 would have gotten the 8.2" unit as standard equipment. The 8.8" rear from that era is actually a 12-bolt, and would have only been used in a heavy-duty application.
02-01-2006 09:00 PM
cameano Thanks. After posting this i was randomly clicking on old threads and someone posted a pic of the 8.2 and 8.5. I immediately went and looked under the car and noticed my carrier doesnt have the two small square edges on the bottom of each side. The guy also said that 8.5's werent available in A-body cars till '73. so... what can i do with an 8.2
02-01-2006 08:43 PM
curtis73 Here is a reference that might help you. There are also 7.5" ten-bolts that sometimes made them into lo-po applications.
02-01-2006 06:24 PM
which rearend?

I understand there 8.2 8.5 and 8.8 inch gm 10 bolts, each one progressively being better suited for higher horsepower apps. true?

which of those is most likely fitted on a 1968 El Camino with a 307 and 2 speed glide?

or better yet, is there an easy way to find out myself?

if it is one of the less desireable models, do i have any options for beefing it up to withstand around 400 hp? what would i put on my parts list if someone handed me seven or eight hundred dollars for the rear end (which is close to my actual budget)

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