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B4C package rear diff question

Old 07-31-2008, 01:04 PM
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Default B4C package rear diff question

I was looking at Motive Gears website and they list a 4.56 gear for the stock 10 bolt but the carrier cross pin must be modified. It has a note though that for ws6 and ss models they use a torsen type differential that uses a block and paddle that you can't modify the pin. I have a 99 camaro with the B4C package I was wondering if it might have that torsen type since it was a police car. Does anyone know?

http://www.motivegear.com/tech_info/...tructions.html
Old 07-31-2008, 01:27 PM
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when you try to put the thrust block back into the torsen after swaping to 4.56 gears it will get hung up on the ring gear because the 4.10, 4.30 & 4.56 ring gears are thicker than 2.73, 3.08, 3.23, 3.42, 3.55, 3.73 & 3.90's

Just look at where the interferance is and grind that much material off the thrust block, its not much, just like 0.125 x 45 chamfer, maybe even less.

SLP sells some stupid kit for like $200 but its a rip
Old 07-31-2008, 03:51 PM
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Is there any grinding on the actual carrier or just the the thrust block?
Old 07-31-2008, 04:53 PM
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just the block
Old 07-31-2008, 08:42 PM
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cool 4.56 gears ordered i found a place that had motive gears for just 155 bucks for stock 10 bolt 7.5"
Old 08-01-2008, 08:54 AM
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this is what I had to do for replacing my OEM 3.23s' w/Auburn to Richmond 4.56s' on a Eaton LSD carrier.
Old 08-30-2008, 03:45 AM
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does grinding the tooth down create any extra gear whine? or is it alright since its out of the contact patch?
Old 08-31-2008, 09:53 AM
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They were put in in sept.of 07.Been to the strip a few times,driven to florida and back from ohio(yeah,4.56s' for a 2200 mile trip) and everythings been fine.


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