12 bolt is 8.875 dia ring gear
The 71 up 10 bolt is 8.5 dia ring gear
both have the same size pinion dia.
Both are fine.
: Which one is better ? what are the pros and cons about both of them?
: help me
: the 10 bolt is an 8.2 & 12bolt i think is 8.875
the 69 12 bolt (complete)
is an easy couple hour swap
for the old 10 bolt
: Thanks for the info Im Right
: No dont have a 8.5, i have a 8.2 rearend in my 1967 camaro. and i would
: like to know about a 12 bolt out of a 1969 camaro. can someone help me
As mentioned, the 10-bolt uses smaller gears, and there were a few
differen sizes for the ring gear: 7.5", 8.2", and the 8.5". The 8.5"
gear is the preferred way to go if a 12-bolt can't be located, and for
most purposes, is strong enough. The 12-bolt is something like 70 lbs.
heavier than the 10, is rare, and is usually way more expensive.
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