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STP Oil Treatment in Transmission

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I used to own a VW Bus(1963) and an old trick to get the thing shifting smooth was fill the transaxle with the recommended fluid and leave room for 2 bottles of STP oil Treatment.

I finally got my B-110 relic back together today(Pictures will come)and the Rear End is whining in 3rd like that old Volks.

Has anyone else here done this? The label on the stuff used to say it was good for gearboxes/ manual transmissions.

I'm going to put some in and I will let ya'll know the results unless you say otherwise.

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We always used STP or Motor Honey in Jeep transmissions and transfercase, it soften the whine.

I put it in my BGB when I overhauled it, I mixed it with the

80/90 before I put it in, it's been about 5 years ago, and

still going strong.

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