Irish1941
1/2 ton status
A little late to the party but poly on a trans isn't great. Whole truck will buzz. And I refuse to use Chinese junk so a little tip for ya: your current trans mount is exactly the same up to 2012 in full size trucks.
700, 4L60, 4L80 etc all the same.
Try GM part# 15750514 or 15113134. Both are the same thing.
I have 15750514 on my '89 Blazer.
700, 4L60, 4L80 etc all the same.
Try GM part# 15750514 or 15113134. Both are the same thing.
I have 15750514 on my '89 Blazer.

15650514 vs 15750514. Might be why he couldn't find it.
