A further thought from the cosmo.
A lot of times on the back end of an aftermarket pinion there will be a number etched in it. It'll be something like 4.5 or 4.73 or 3.2 anyway that number is the measurement from the back of the pinion to the center line of the carrier.
So you place a pushrod or ruler angled across the housing under the caps. Then measure the distance from the back of the pinion to the underneath side of the pushrod or ruler whichever you're using and if that number is equal to the number etched on the back of the pinion then you're good.
However if your number is smaller than what is called for you would remove shims from behind the inner pinion bearing.
Just the opposite if the number is bigger you would add shims behind the inner pinion bearing.
If you go to put a new set of gears in this I highly recommend that you use the same thickness of shims as the original pinion used for starters.
A lot of times on the back end of an aftermarket pinion there will be a number etched in it. It'll be something like 4.5 or 4.73 or 3.2 anyway that number is the measurement from the back of the pinion to the center line of the carrier.
So you place a pushrod or ruler angled across the housing under the caps. Then measure the distance from the back of the pinion to the underneath side of the pushrod or ruler whichever you're using and if that number is equal to the number etched on the back of the pinion then you're good.
However if your number is smaller than what is called for you would remove shims from behind the inner pinion bearing.
Just the opposite if the number is bigger you would add shims behind the inner pinion bearing.
If you go to put a new set of gears in this I highly recommend that you use the same thickness of shims as the original pinion used for starters.