GM350 trans on the fritz

[nvr2red]

Please help me diagnose: GM 350 trans, sounds like it is slipping, and won't shift to 3rd after it gets warm. No other wierd noises. Worked just fine until I GUNKed the frame and parked it in the garage to wax it. Started off yesterday to go to a car shindig, and it wouldn't shift. Checked the fluid level - it's ok. It's too low to get underneath, but I looked with a mirror on a stick and can't see any hoses or wires disconnected. Tried it again this morning with the same results. Thanks in advance

[**DONOTDELETE**]

Vacuum modulator hose unhooked?

[nvr2red]

Thanks! I remembered taking off the air cleaner so I checked there and behind the carb I found a 2" vacuum hose that was shot. Replaced it and it shifted fine. About 36 hours too late, but at least no trip to the shop and looking stupid.

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