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Hey Lewis,It has been awhile since I had a Toyota 5-speed transmission rebuilt. At that time my transmission shop said they only use Toyota factory synchro rings. The aftermarket non-Toyota synchros were manufactured with an alloy material that would not perform as designed and engineered by Toyota. Since synchros work basically as a friction brake, the coefficient of friction (and alloy material) apparently is a critical factor in their proper operation and function. The synchros, as with other transmission components, and transmission gear oil, are critical to proper operation. There are many design calculations required to make them work correctly.I would trust Marlin’s opinion on anything Toyota transmission or t-case.Gnarls.
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