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04-21-2018, 01:48 PM | #11 |
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Re: 12 Bolt vs 10 Bolt Rear
Vehicle weight is a big deal. Moser may offer a bolt-in 12 bolt. I would check with them.
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Ed Wright 4156 SS/JA |
04-21-2018, 09:43 PM | #12 |
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Re: 12 Bolt vs 10 Bolt Rear
Dan
Isn't that a 7.5 inch 10 bolt in the Impalas. ? I had to run Pro Gears in my 68 Impala, broke street gears, but then again a 4000 l b BBC stick car at that point. Running same 4:88's in my 65 automativ car. Will Lamprecht 65 Impala 396/325 |
04-21-2018, 11:21 PM | #13 | |
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Re: 12 Bolt vs 10 Bolt Rear
Quote:
B-body’s got the 8.5 inch rear. None of us in the Impala club are having problems. Unless they are using a Stick. Chipper brought up that the 8.5 rear uses the same bearings as a 12 Bolt. That makes it stout. Wonder if a 12 bolt ring and gear and Spool will fit in a 8.5 Pumpkin? |
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04-21-2018, 11:34 PM | #14 |
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Re: 12 Bolt vs 10 Bolt Rear
Still trying to figure out the best gear ratio.
Using 4.56s with a 4L60E trans. Not using the locking converter now. Looking at 5.38’s and locking it up in high gear. I can program that in the PCM... Hope to get close to the K/SA index with current cam. |
04-21-2018, 11:44 PM | #15 | |
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Re: 12 Bolt vs 10 Bolt Rear
Quote:
The Impala SS may have all come with the 8.5. Pinion bearings and flange are different, for one thing. 8.5 and 12 bolt take different side shims.
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04-22-2018, 07:56 AM | #16 | |
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Re: 12 Bolt vs 10 Bolt Rear
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All were 10 bolt 8.5 rear Camaro/FB all came with smaller 7.2 rear. They can surprisingly survive with a good bit of power too..! About a $1k less to beef up a 10 bolt than installing a prepared 12 bolt unit. They make them to fit our B-body. Interesting being the same suspension configurations as the early Chevelles, GTO, Cutlass, GTX. D |
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04-22-2018, 10:09 AM | #17 |
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Re: 12 Bolt vs 10 Bolt Rear
Generally the B bodies with the Baby LT-1 or 305 have the smaller rear. The LT-1's generally have the 8.5 (Impala and Caprice).
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04-22-2018, 10:36 AM | #18 |
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Re: 12 Bolt vs 10 Bolt Rear
The later F-Bodies got a beefed up 7.5 rearend , with a bigger 7 5/8" ring gear .
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04-22-2018, 10:50 AM | #19 | |
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Re: 12 Bolt vs 10 Bolt Rear
With the money you save from staying with the 10 bolt you can probably afford a golf cart and a tow strap. Eventually, you will need it.
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04-22-2018, 11:49 AM | #20 | |
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Re: 12 Bolt vs 10 Bolt Rear
Quote:
Whatever you do , don't tell him the early Chevelles did not have the same suspension. Although it looks similar, it is not a metric configuration. Also , I have never seen a bolt in 12 bolt for those cars. Maybe those SS guys can help him. Apparently we are not qualified here.
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