4l60e clunks when shifting

[Vortec Lover]

This might sound weird, but has the transmission been rebuilt? If so, it might have a shift package of some sort. Just throwing that out there- a firm, solid shift might be called a "clunk" or a "jolt"

 

[great white]

Try checking the universals, too!

There's a good idea that lots of guys forget.....

 

[sewlow]

Has your truck had any suspension work/mods done to it? My blue truck has a 2/4 drop, & I've had to play with the pinion angle by adding shims. It's had the U-bolts on the rear end/leafs re-&-re'd more than once. The time before last, I had a friend helping out. After that, the truck developed a 'clunk'. (the truck's a stick, so sometimes the shifts aren't as easy on the drivetrain as an auto) Went to change the shims from a 2.5* to 4* yesterday, & DAMN!, 2 nuts on the u-bolts on the passenger side were a little more than finger tight!!! Don't know if it was me or the other guy that did that, or if the rear center pin wasn't seated properly when it was put together, & it settled into place after being driven for a bit. But, after the install of the 4* shims, I made sure that everything was TIGHT!!! Put 60 miles on the truck, then I hit those u-bolts again with an impact. No more 'clunk'.

 

[SilveradoGuy85]

It's when taking off quick, 1st to 2nd.
Oh, near Emporia, VA I imagine?

Yup, 20 minutes from there. I go to Sadlers truck stop everytime I go to Emporia lol.

 

[Dust92]

I don't think the Trans has ever been rebuilt, but I will check the universals soon. Thanks!
I know where Sadlers truck stop is! Lol I work with a lot of people from emporia and skippers.