On Old Paint's maiden voyage, one problem surfaced. Although the tranny was rebuilt before I got it, the torque convertor is behaving oddly. After driving for twenty miles or so, the torque convertor acts like a lock-up convertor that won't release! It nearly stalls the engine at traffic lights and strains to take off with NO slippage at all! Goes through the gears like a stick shift - bang-bang-bang. The under-frame cooling fan is running strong, the fluid looks good -red, not brown, and doesn't smell burnt. I put it in neutral at stops, and drop it in drive when I go. After cooling down for ten minutes, it's back to normal for another twenty miles. On the highway, I never notice a problem because the TC isn't called upon to slip.
Any sage advice forthcoming?

 

Who makes your convertor? It might be too tight.

 

MOPAR, but the problem went away

 

The problem went away and the tranny works properly. But the way it WAS working has got me wanting lockup in every gear now. I'll be looking for a 47RH to swap in.