i have an 85 t/a and the speedo bounces a lil bit and makes a noise its been sitting for 2 years is there any lubrication procedures?

also can i replace the speedo with a 1986 + gear driven cluster the ones that show a sporty 140 insted of plain 85?

if so what do i need to do?

 

I'm not a Pontiac guy, so take the following with a grain of salt. IIRC, your 85 is a mechanically driven speedo, 86 up electric, so swapping would be problematic. Here's a lube procedure:

With the cluster removed, pull the cable from its housing. Inspect it for burrs, fraying or breaks. Unscrew the housing from the tranny and shoot Brake Clean or some other cleaner down the housing until the fluid is clear. Brake Clean will dry rapidly. While you're there, you might inspect the drive/driven gear for problems. Button up at the tranny. Clean the cable itself, then put a glob of Napa's Sil-Glyde (mentions speedo lube on the tube) in your palm and run the cable through it as you thread the cable back into the housing. You'll probably have to manipulate the cable a bit to reseat it in the speedo sleeve at the tranny end.

JamesC