Hot Rods What Does This Adjust On My Powerglide ?

There's a 9/16 nut with an allen head bolt next to the shift lever on my Powerglide, what is this for?

 

Low gear band.

 

OK, Thanks. I took the trans to the shop to have it checked out, they pulled the pump, pan etc. and it checked out good but after getting it back home I noticed that the 9/16 nut was backed off, which didn't look right.

I tightened the nut up without touching the allen bolt, how do I make sure it's adjusted correctly? Or do I need to take it back to the shop and let them fix it?

 

Didn't see the link, but I just read online how to do it, and I even have an inch pound beam torque wrench.
But, I paid them to check it out, and I'll bet the guy just left the nut loose, so
they need to take care of it. The shop had already closed when I found this,
and I posted here to see what was going on.

• Tighten the band adjustment screw to 72 inch lbs
• Unscrew the band adjuster three and a half turns (3.5)
• Tighten the band adjustment screw's locking nut

Thanks, Jim