Transmission woes...

[Shifter23]

Car #1 1990 TSTE

Car runs and drives fine but anything other than light normal throttle, the car slips in all gears.  Not sure what to do could it be a TV pressure issue or possible wrong vaccum modulator?  (vaccum line is hooked up)

Car#2  1990 TGP

Car runs and drives but sounds like a possible pump failure i think idk.  It hums at idle in park and neutral and gets worse when put into a drive gear.  Slips in lower gears unless light-footed.  Fluid level is ok and modulator is hooked up but has a vaccum tee spliced in it for another accessory i think i just got the car.

[TGP Nick]

Take some pictures if you can

[grinders_18]

The modulator Tee you're referring to is necessary. On the left side, there should be a vac line coming down from the throttle body (begins as a steel line), connecting to the tee, and the right side needs to be open for release...there should be nothing connected to it.

This is on ALL TGP's and TSTE's.

[Shifter23]

I'll double check on that thanks!

[cobracmdr]

Fix the vac line and get an adjustable vacuum modulator to get the line pressure up, oh and change the fluid and filter.......

Ken