TH350 Tranny Fluid Filter Change

[72BlckButy]

I would like to hear everyone's opinions... According to this past thread, people have stated that it is a bad idea to flush a transmission. I have owned my truck for almost 3 years, and have never had any service done to the tranny. First off the tranny is leaking from somewhere, where it's hard to tell, but I would like to replace the gasket/filter and just refill with new fluid.

Does anyone see any problems that might arise from doing this? I have heard speculation that this may bring out other problems by changing the pressure in the tranny, moving things around... and so on. This thing is leaking like a sive, and I would like to do some preventative maintenance, but now I'm a little worried to clean it out. I wasn't planning on flushing it, or using any chemicals to clean it out, it would mainly be just to replace the gasket/filter and add new fluid. I'm hoping the new gasket will help to minimize the amount of fluid lost...

Anyway, thanks for your experiences and information!