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My 4.56's ruined after only 9 passes and zero street miles???

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Old 02-02-2010, 01:17 PM
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Originally Posted by Mr. Sandog
Gotta see pics as 'trashed' is a little too vague to know exactly what happened.

The question I have is, is this a 8.6" 10-bolt we're talking about? If so, then that's your problem. The pinion on a 4.56 10-bolt gear set starts life already compromised.
Why is that? Mine have close to 10,000 hard miles on them with zero issues
Old 02-02-2010, 02:47 PM
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we need pics
Old 02-02-2010, 08:10 PM
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Hey Blown06, did you ever hook up your torque arm/ladder bar setup? If so, the added load in the cast center section from the torque arm could've caused deflection of the ring and/or pinion gear. Did your builder at least put your rear on a jig to see if everything is true and straight before he put the 4.10's in?
Old 02-02-2010, 10:45 PM
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I can tell you for sure just like these other guys that setup is everything when it comes to gears. Ive watched a buddy of mine put brand new 4.56s in his Trans Am on Friday nite, drive it straight into the trailer from the bay, and make 7000rpm clutch dump launches on slicks at the track the next day. He has had the same set of gears in that car for 2 years now. Theyve probably seen 75 passes at least. He beats the **** out of that car and those gears take all the abuse he throws at it.
Old 02-03-2010, 12:48 AM
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Originally Posted by viciousknid
Was it making any clanking noise when you took it in to him?
If not, get pics of said gears.
If the ones he is showing you are missing a few teeth in a row it would have DEFINITELY been clanking. I know that first hand.
No clanking, no whining or anything. All teeth still intact, no signs of cracks either.

Originally Posted by Mr. Sandog
Gotta see pics as 'trashed' is a little too vague to know exactly what happened.

The question I have is, is this a 8.6" 10-bolt we're talking about? If so, then that's your problem. The pinion on a 4.56 10-bolt gear set starts life already compromised.
Yes, it is the stock 8.6" 10-bolt

Originally Posted by viciousknid
Edit: this went into the wrong thread.. My bad
It's all good. lol

Originally Posted by SILVERADO11
we need pics
No pics. Gears are already in the city dump.

Originally Posted by vanillagorilla
Hey Blown06, did you ever hook up your torque arm/ladder bar setup? If so, the added load in the cast center section from the torque arm could've caused deflection of the ring and/or pinion gear. Did your builder at least put your rear on a jig to see if everything is true and straight before he put the 4.10's in?
No, I have not installed the torque arm yet. The housing was straightened after I welded that 9000 lbs. of bracing to it. I doubt it moved.
Old 02-03-2010, 01:44 AM
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Originally Posted by Blown06
The housing was straightened after I welded that 9000 lbs. of bracing to it. I doubt it moved.
little of an understatement maybe...? jfwy i thought you did a good job with that 3tons of bracing.
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