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I have installed a 400 sbc which
has 619 dynoed hp in my '84 Regal. Do you think the GN posi trac that i bought and rebuilt will handle all that hp and torque that my GM motor is dishing out.
I've heard that the most a GN 3.42 8.5 posi
can handle before breaking is 450hp with
about 500 foot lbs of torque. I hope that
I heard wrong because I have put alot of money into rebuilding the rear-end
 

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Originally posted by chris jensen:
I've heard that the most a GN 3.42 8.5 posi can handle before breaking is 450hp with about 500 foot lbs of torque. I hope that I heard wrong because I have put alot of money into rebuilding the rear-end
I would say from my experience that you should be ok, I had the Moser 30 splin axles, Detroit Locker and new 3.90 gears in my 8.5 and it ran good when I was running in the 10.74 range with a 3700# car with 1.46 60'on the foot brake.

I do know some people who have gotten into
the low 10's with them but there 60' and weight of the car was lighter (3500# range).

I had no problem with the 8.5 until it meet
my new stage motor and the T400 with a brake.
This changed my 60' to 1.33 and it only lasted 3 passes when the pinion gear took out
all the teeth of the ring gear, nothing else was hurt so my car now has a 9"

Take Care

Neal
 

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I don't have the original axles or posi unit, but mine is still together with the stock gears.

I recommend a T/A cover

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If you keep the housing from wrapping up with new boxed upper and lower arms and snubber or racing arms. Not sure what times you are looking to run but you may need
C-clip eliminators,race axles and longer studs.

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