Isn't Dexron VI compatible with Dexron III, or do these transmissions require the older spec fluid?
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Yes the new fluids are backwards compatible. I usually just use Dexron/Mercon Valvoline or Supertech fluid for a daily driver. Might up to Dexron VI or Valvoline Synthetic for a tow vehicle or race transmission.Isn't Dexron VI compatible with Dexron III, or do these transmissions require the older spec fluid?
OK, I will have to take a closer look on the transmission mount, but I think i felt some play in the U-joint as well.To me it looks like tail housing is moving with drive shaft you might check rear transmission mount.
Did you have transmission in neutral when checking rear diff for play in the way it turns.
I jacked the rear up and checked it in neutral again today and can tell that the pinion yoke definitely has no play at all in any direction.Jack the rear, put on stands, shift to neutral, then re-inspect. Rotate driveshaft several times while looking and feeling.Test Pinion by pulling and pushing as well as axial play.