Howdy guys, I've been lurking for I while, and I really dig the website...
I have an '86 Ford B700 skoolie with a 370c.i.d and an AT-540. My band has put about 18k miles on it in the last couple summers with no major problems (it's at about 150k mileage).
One thing that concerns me, though, is some weird transmission behavior. On hot days, when driven for any considerable length of time, it sounds like the transmission revs up for about 5-15 minutes at a time. By this, I mean it sounds like the transmission's RPM seems to go up by 1k or so.
The frequency and length of the occurances seems to be directly correlated to temperature. If we run at night, I can go for 10 hours without it happening. Driving through AZ in July during the middle of the day, it was wound up pretty much the entire time. I've installed a tach, and my engine-RPM stays rock solid during the "rev-up". Anyone know what 's going on? Am I in danger of a transmission failure?
Thanks in advance; I really appreciate all the help this site brings.