can a 4th gen rear with 3 series carrier 3.73 gears and girdle handle 400 hp?
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TKOPerformance
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May 16, 2012
- Join DateDec 2003
- LocationNewark, DE
- Posts:2,391
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- Car'86 Camaro, '02 WRX, '87 K5, '67
- Engine350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder
- TransmissionT56, 5-speed, 700R4, C4, T176, semi-auto 2-speed
- Axle/Gears3.73, 3.90, 4.88, 3.55, 3.54, 7.00
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That's a heavily loaded question. Short answer no. Long answer yes, but with a lot of caveats.
Yes, if the axels are in like new shape, preferably if they've been replaced with new ones from Moser, Yukon, or Superior. And if you don't forget the cap stud kit when you do the girdle. And if you use a solid pinion spacer instead of a crush sleeve. And if you use a new posi unit from Eaton or Yukon (The stock spiders are suspect, and could fail with catastrophic results). And if the gear setup is perfect, preferably using new Yukon gears. And if all the bearings and races are new Timken units. And if you stay away from outright slicks. Sticky stree tires will be fine, and DOT slicks will be okay; for a while...
It can be made to live, but I don't want you to have any illusions. Most guys that are serious are running a 12 bolt or 9", and there's a reason for that. There are just too many unknowns in the strength of drivetrain parts to give a definite yes, unless there's overkill built into the equation, which you have with a 9" or 12 bolt, but not so much with a 7.625" 10 bolt.
Yes, if the axels are in like new shape, preferably if they've been replaced with new ones from Moser, Yukon, or Superior. And if you don't forget the cap stud kit when you do the girdle. And if you use a solid pinion spacer instead of a crush sleeve. And if you use a new posi unit from Eaton or Yukon (The stock spiders are suspect, and could fail with catastrophic results). And if the gear setup is perfect, preferably using new Yukon gears. And if all the bearings and races are new Timken units. And if you stay away from outright slicks. Sticky stree tires will be fine, and DOT slicks will be okay; for a while...
It can be made to live, but I don't want you to have any illusions. Most guys that are serious are running a 12 bolt or 9", and there's a reason for that. There are just too many unknowns in the strength of drivetrain parts to give a definite yes, unless there's overkill built into the equation, which you have with a 9" or 12 bolt, but not so much with a 7.625" 10 bolt.
Quote:
Yes, if the axels are in like new shape, preferably if they've been replaced with new ones from Moser, Yukon, or Superior. And if you don't forget the cap stud kit when you do the girdle. And if you use a solid pinion spacer instead of a crush sleeve. And if you use a new posi unit from Eaton or Yukon (The stock spiders are suspect, and could fail with catastrophic results). And if the gear setup is perfect, preferably using new Yukon gears. And if all the bearings and races are new Timken units. And if you stay away from outright slicks. Sticky stree tires will be fine, and DOT slicks will be okay; for a while...
It can be made to live, but I don't want you to have any illusions. Most guys that are serious are running a 12 bolt or 9", and there's a reason for that. There are just too many unknowns in the strength of drivetrain parts to give a definite yes, unless there's overkill built into the equation, which you have with a 9" or 12 bolt, but not so much with a 7.625" 10 bolt.
ok with that being said how about adding the LPW support cover with axel tube brace kits? I unfortunately cannot afford a 12 bolt or 9" this year with the engine rebuild. I have 2 other back up rears incase of catastrophic failure.Originally Posted by TKOPerformance
That's a heavily loaded question. Short answer no. Long answer yes, but with a lot of caveats.Yes, if the axels are in like new shape, preferably if they've been replaced with new ones from Moser, Yukon, or Superior. And if you don't forget the cap stud kit when you do the girdle. And if you use a solid pinion spacer instead of a crush sleeve. And if you use a new posi unit from Eaton or Yukon (The stock spiders are suspect, and could fail with catastrophic results). And if the gear setup is perfect, preferably using new Yukon gears. And if all the bearings and races are new Timken units. And if you stay away from outright slicks. Sticky stree tires will be fine, and DOT slicks will be okay; for a while...
It can be made to live, but I don't want you to have any illusions. Most guys that are serious are running a 12 bolt or 9", and there's a reason for that. There are just too many unknowns in the strength of drivetrain parts to give a definite yes, unless there's overkill built into the equation, which you have with a 9" or 12 bolt, but not so much with a 7.625" 10 bolt.