4L80E Transmission Mount Bolt

[Thestig34]

I have a 93 k2500 7.4 suburban with the 4l80e. I had been having a horrible rattle and shake, I went under the truck today to coat the frame before winter and saw that my transmission mount was missing one bolt and the remaining bolt was hanging on by a thread. Long story to ask if anyone knows what size bolt I need and if there is a torque spec I should shoot for when putting them back on?

 

[CumminsFever]

I'm going to assume you're talking about where the mount bolts to the transmission, or transfer case adapter. Those are metric. I don't know the size. Either 10 or 12. Hope someone here knows the actual specs. Anyway, I've had them back out on me 1 time. I just make them tight with a wrench, but use a MILD loctite. I assure u, they never come loose again!

 

[Schurkey]

Take out the loose one, match it up with another at any decently-stocked hardware store...or the GM dealership.

If you have a metric tap and die set--or even a metric thread-pitch gauge--you'll easily find the thread pitch, and then it's just a matter of diameter and length which can be determined with a metric tape measure, caliper, micrometer, etc.

 

[Drunkcanuk]

Not sure if it's the same as a 700r4, but my bolts measured out at M10-1.5-30mm

 

[Thestig34]

Thanks everyone. They were M10-1.5