I just picked up a 91 250 w/ auto tranny

sometimes, mostly after i've been driving for a while, shifting from reverse to drive or vise versa gets kinda rough, jerky almost.. It doesn't always do it, and mostly not right when i start up.

Also, if i let up on the fuel right around 25 is shifts kinda hard into third...but only if i let up on the fuel, problem is our town speed limit is 25.

Any thoughts??

 

What to you mean by rough? Like a clunk going from reverse to drive, or a vibration? It sounds to me like slack in the driveline. Could be u-joints, or it could be the cross pin or clutches in the diff.

Check the TV cable adjustment for the shift troubles.

 

more like a clunk a heavy forward or reverse jerk when the shift happens
TV Cable??

 

is it a overdrive trans or non overdrive?

 

Overdrive tranny

 

Sounds like your line pressure is cranked up pretty good. Might try adjusting your tv cable. Mine rattles the dash when I shift into third sometimes, I've just learned to time it right.