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Old 10-25-2009, 07:15 PM
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4l60e-original 2-4servo or corvette

My Performabuilt "Heavy Hauler" trans that crapped out with 16K miles on it had a Corvette servo. I am wondering if the improper setup, with the pin protruding too far, could lead to the undo wear that this trans showed. the bushings in the reverse input drum wore out, causing the stator shaft to wear out also. The wear on the stator is on the top half of its diameter......of course, gravity would also cause the reverse input drum to drop and wear the top of the shaft. I don't have the checking tool to check the pin protrusion according to the ATSG manual, and am thinking of using the original servo, which I still have, which should be set up correctly as far as pin protrusion. I noticed when installing the band and the servo, that if I push the servo pin in hard, that it will actually pull downward on the reverse input drum.
Is my thinking reasonable? Could an improperly setup servo pin lead to this kind of wear? Also, this trans was out of warranty.
Thanks for any insight.

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Old 10-25-2009, 10:03 PM
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Any servo that is setup incorrectly wil cause problems with the band.

The line of thought you have on bushing wear is one I have never heard of. I guess gravity plays a role in the bushing wear. Gravity sure is rough on my middle aged body ... normally that bushing wear is a lube problem. As the bushings wear the lube oil does not flow where it should.

The bushings in the pump stator are a high wear area often. Replace both bushings in each end of the stator support always

No tool needed for servo setup clearance. Assemble the complete servo into the bore... minus the O-ring on the cover. Install snap ring too.

Push the cover inwards, you want about .125 inch of travel inwards of the servo cover. You can watch the band apply through a hole in the case at the valve body area for movement...

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Old 10-26-2009, 08:37 AM
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Crosley, I know I'm probably wearing you out with all my questions. I really do appreciate all of your help.
Thanks once again.
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