Hard to say exactly what is making the 'glide noisey. Could be a front pump or the planetary gears. Whatever, I'd yank it out and install the TH350. 2 things you'll have to deal with are the kickdown cable - you can use the set up from any 250 / TH350 vehicle or an aftermarket bracket near the carb, and the front yoke on the driveshaft is different and the drivehaft length has to lose about 2 inches usually. TH350 bolts right up to your engine and flexplate and the mount under the tailshaft is the same and in the same location.
It makes a very nice set up and is not all that hard to do.
