1986 I roc rearend
07-21-2013, 03:29 PM
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Re: 1986 I roc rearend
The other options would be a 12-bolt or a Strange (Dana) 60. They are both lighter and mechanically more efficient than the 9-inch. The issue with a 3rd or 4th Gen is the need for the rear to have the torque arm mount, so that means you either have to have a high level of fabricating skill, or buy a direct bolt-in from Strange or Moser. You're looking at $2,500 - $3,000 for one of those.
There is no way the stock GM 7.5"/7.625" 10-bolt will live behind an engine like that. I don't know if GM used the Borg-Warner Australian 9-bolt in the 86 IROC, but I doubt it. They are a bit stronger than the 10-bolt, but not much.
I have a Strange 12-bolt behind an engine making 800 HP/800 lb-ft at the flywheel, and that's probably the upper limit for the 12-bolt.
There is no way the stock GM 7.5"/7.625" 10-bolt will live behind an engine like that. I don't know if GM used the Borg-Warner Australian 9-bolt in the 86 IROC, but I doubt it. They are a bit stronger than the 10-bolt, but not much.
I have a Strange 12-bolt behind an engine making 800 HP/800 lb-ft at the flywheel, and that's probably the upper limit for the 12-bolt.
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