upshift noise in a 91 GP 3.4L 4t60e

[Coyote_Rage]

Sometimes during hard acceleration during a manual upshift at around 6k rpm I hear a noise much like a chain slap or big gears skipping teeth. I have also noticed that during hard acceleration that the 1-2 shift has gotten hard. I think the tranny is fixing to puke.

[gpse3400]

When the trans starts shiting too hard it'll make some eronius sounds. I'd check the vacuum modulator. pull it out and turn it upsdie down ans see if oil comes out the vacuum connection. if it does get a newone, via your parts store or betteryet rock auto. the vaccum modulator is the canister mounted on the front top drivers side of the transmission near thr electriacl plug.