Got that already from the service manual BC. And it's a NV3500, Those
numbers translate to a synthetic 75w90 GL-4 from what I can sort out,
Problem is you can't find any synthetic 75w90 GL-4 syncromesh fluid at any of the
farm stores or any of the multitude of auto stores in the area. Even hard to find it on line.
Taint payin' $30 or $40 a quart for the stuff at a GMC or Chevy dealership.
All, and I mean all, of the parts store guys say they sell the "Pennzoil Syncromesh
Transmission Fluid" to any and all for manual transmissions and that's the only product
they carry for manual transmissions. The Oil change shops say the same thing.
That Pennzoil is a GL-3 oil and it's not a synthetic....if that's what's still in the trans
after 20 year on the road.
dg
Last edited by Denny Graham; 10/17/2017 6:13 PM.
