Partial throttle tranny slip

[ps2cho]

This started after my indy said my transmission was "shifting a little rough...I will adjust it".

I'm not sure what he did exactly, but I'm guessing the modulator? It sort of hangs at the rpm before shifting, or it slips at 3/4 throttle. At full throttle it does not slip.

I have adjusted my throttle linkage and it made no difference to the problem, only changed where in the rpm range it shifted at. It still hangs for 1-1.5sec at whatever rpm before shifting.

Does it sound the vac mod or something else? I never had any issues prior to whatever he did. If it is the VM, is this something I can do myself or should I really go to someone else to have them correctly adjust it?

Thanks,
Robert