Funny thing happed

I've been layed up with a bad back and haven't had my 37 out for awhile so yesterday I got into and took it out and was crusing around 65 and put it into passing gear, got up to ninety and then nothing. Engine ran but no tranny. Was out in the country w/o any tools to speak of and sat there and let the tranny cool down and it worked fine. Ran it hard again to see if the probelm happed again but didn't. Got home and tranny fluid looked good and wasn't low. Any thoughts?

Only thing I can think of is that it gained condensation while sitting,and you cooked it out? Hank

Probably a valve in the valve body stuck....When is the last time it was serviced or flushed?

I had it apart about 6 months ago and flushed it out and put new oil in. The only thing I saw was some cluth material in the pan, not alot but some that wasn't there before.