volvo says 30W because of slippage of O.D. friction material. irv gordon went 2.6 million miles before trans was taken apart, 3rd gear syncro went hooey. im am .00001% chemist, isnt shear on tooth contact 90W is used.i work on cars,im not a writer.any thoughts. working on 1800s for driving once more. B20 M-41 and 4.10 rear gear.in garage for 25 years,time to get rolling again. i am third owner. have original papers from new at dealer. 1965 is black. what about available black in 1965. selling miata?!? to throw money at 1800. just brakes and tires. i can twirl the wrenches.keeping stock height and tire size so i can get out of the car. parting out #1449. Al
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