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Ya gotta understand, when they write the manuals, it's for what's available at the time.

If you really want to know what oil to run call Brewer's. They're the experts.

It actually calls for GL4 in factory manual. The brass synchros dont wear with that particular oil. Just drained the 140 out to put in 90. The 140 was hard to shift until it got warmed up.

If you change your bellhousing, I can use the Z bar if its for an early 64-66 A body.

I've tried several fluids == latest was something that was pricey and formulated for 4 speeds but can't remember what.

My 4 spd used to grind when downshifting so i bought new synchros and took it to a shop to have them replaced. He had me also get a new bearing in a race but don't remember which one. Anyway, I get the tranny back and it downshifts perfect but grinds a little 2-3 and 3-4. I've adjusted the...

AutoZone has a 10" clutch kit that fits a 9 1/2" flywheel.

I believe the /6 4 speeds had a little lower 1st gear.