I have an OD issue. It will not go into OD on lite throttle (it slips till you let off the gas, then it goes in.), only on moderate to hard shifts, then it goes in fine. I can also, manually put it in OD. Sometimes if I'm going 40-45mph, the car will "shudder" slightly, while going into gear. 50mph and over it manualy goes in fine. Problems became more noticable, after reverse flushing the tranny. The tranny has 29K on it after an internal rebuild (mostly stock parts, sevro's, piston, Blue plate kevlar clutches, etc.) I tried replacing the 3-4 upshift module (Fluid still red) and it fixed it for awhile. Now it's right back to doing it again, after about a week. The tranny grabs each gear very well pushed, but reaches a little (not slipping) for third and fourth under normal throttle, more so, when it gets hot. I have no idea what the problem may be, any ideas would help greatly, thanks.

 

I'll take anyone's guess, don't have to be a tranny experiment.