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Old 04-05-2010, 06:45 PM
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Powerglide & GM 7.5" Rearend

I am looking for ways to trim reciprocating weight on our powerglide and GM 7.5 rearend. We run a class that has limited horsepower on a dirt oval. Is anyone aware of a lighter ring gear and pinion avaliable for this rearend? I have found a book that talks about lightning certain gears insde the transmission. I am open to any ideas anyone has to help me achieve our goal. Thanks for the help.

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Old 04-05-2010, 07:06 PM
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Quote:
Originally Posted by VanceNoland
I am looking for ways to trim reciprocating weight on our powerglide and GM 7.5 rearend. We run a class that has limited horsepower on a dirt oval. Is anyone aware of a lighter ring gear and pinion avaliable for this rearend? I have found a book that talks about lightning certain gears insde the transmission. I am open to any ideas anyone has to help me achieve our goal. Thanks for the help.
The tranny and diff don't have reciprocating weight, but you can trim some weight from the ring gear to lighten it a couple ounces- but the gains are miniscule as I'm sure you're aware. That diff is weak already, I'd be very careful reducing weight there.

The Powerglide has all the parts in the aftermarket to build a tranny w/o any GM parts in it- there are all sorts of low-mass drums, etc. that are available for them.

A couple thoughts-

Wheel bearings, drive shaft weight, u-joint yoke and joint size can sometimes be reduced, along w/meticulous maintenance can all be looked at.

Unsprung weight reduction will always help. The rotor size and thickness, weight of the wheels, tire weight (prob. spec tires, though) can be whittled on.

The viscosity and type (synthetic) as well as the amount of lube can be changed to be less power consuming. This will hold true for the engine right on back to the diff.
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