82 Chevy S-10 Manual Transmission Lube Oil

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My son has an S-10 with an Isuzu manual 4-speed. We replaced the Dextron II ATF with a synthetic. The transmission used to grind the synchro's every once in while with the Dextron II but now with the synthetic is grinding when you downshift from fourth to third. Could I go to a heavier gear lube in this transmission to reduce the grinding until we can replace it or rebuild the synchro's?? The manual calls for ATF.

10/27/0411:59 AM

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