Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

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Old Jul 26, 2006 | 03:38 PM
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hammrman31's Avatar
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Question 10 bolt

i own a 95 and a 71 z28. both are 10 bolt rear ends. i hear the 4th gen. cars have a glass rear end,but the 71 10 bolt is better. i want to go to the track with the 71,but don' want to go if the rear is going to break. anyone here have first hand experiance with a stock 71 10 bolt? i was rebuilt, same ring and pinion that it came whith 4:10. both cars are auto. a4 400 turbo. thanks. greg
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Old Jul 26, 2006 | 04:05 PM
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Originally Posted by hammrman31
i own a 95 and a 71 z28. both are 10 bolt rear ends. i hear the 4th gen. cars have a glass rear end,but the 71 10 bolt is better. i want to go to the track with the 71,but don' want to go if the rear is going to break. anyone here have first hand experiance with a stock 71 10 bolt? i was rebuilt, same ring and pinion that it came whith 4:10. both cars are auto. a4 400 turbo. thanks. greg
I'd say go ahead and run it, I'm pretty damn sure the 2nd gen F-body 10 bolt is the 8.5" 10 bolt that was used in the 80s G-bodies and in B-bodies in the 80s and 90s. The 8.5" is a pretty durable rear.
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Old Jul 26, 2006 | 04:26 PM
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Originally Posted by 91Z28
I'd say go ahead and run it, I'm pretty damn sure the 2nd gen F-body 10 bolt is the 8.5" 10 bolt that was used in the 80s G-bodies and in B-bodies in the 80s and 90s. The 8.5" is a pretty durable rear.
Yes go ahead and run it. The 2nd gen Fbody did, as 91z says, come w/ the 8.5" 10 bolt. Some of the b-bodies did come w/ the 8.5" (others w/ a 7.5"), but the only G body's to come w/ the 8.5" were the 84 H/O, 85-87 442 (3.73 gears) and the 84-87 turbo regals (3.42 gears). The SS was never available w/ the 8.5".....
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Old Jul 26, 2006 | 05:48 PM
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thanks guys.great info.
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Old Jul 26, 2006 | 11:23 PM
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If its a true 71 Z-28 it should have a 12 bolt


Wade
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Old Jul 27, 2006 | 02:04 PM
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Originally Posted by firebird69racer
If its a true 71 Z-28 it should have a 12 bolt


Wade
it is a true 71. the big differences between a 70 and 71 z28 are as follows. 70 z28 350--360 hp-11:1 cr. 71 z28 350 ==330 hp-9:1 cr. for the 71 model year gm downgraded to a 10 bolt diff. thats what i have in my car [the 71].all i was trying to do was to make sure the rear diff. in my 71, was not the same as the one in my 95 z28,cause i keep hearing very bad things about them. thanks for the replies,guys sound,s like an 8.5.
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