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i have also seen this happen with trannies. what i believe is the problem is, it is not the new fluid being bad, but the people that change the fluid also adjust the bands at the same time, and i believe that alot of them adjust the bands wrong. not saying this is the problem in all cases, but maybe some of the cases. just my $0.02 on that subject.
on the subject of using type f fluid in your tranny, i would advise against it. type f has a different coefficient of friction, and viscosity than dexron or mercon. i am not sure if it is heavier or lighter. if it is heavier it would probably be about like using 80w90 in your engine, and if it is lighter it would probably be like using straight 10 weight oil in your engine. either way not a good thing. another example would be using regular gl5 fluid in a limited slip rearend.
the type f fluid probably wouldn't hurt your tranny right away. however, i am sure it would increase the wear on your tranny and make you have to do a rebuild alot sooner than using the fluid that was designed for your tranny. also, just my $0.02
eric
on the subject of using type f fluid in your tranny, i would advise against it. type f has a different coefficient of friction, and viscosity than dexron or mercon. i am not sure if it is heavier or lighter. if it is heavier it would probably be about like using 80w90 in your engine, and if it is lighter it would probably be like using straight 10 weight oil in your engine. either way not a good thing. another example would be using regular gl5 fluid in a limited slip rearend.
the type f fluid probably wouldn't hurt your tranny right away. however, i am sure it would increase the wear on your tranny and make you have to do a rebuild alot sooner than using the fluid that was designed for your tranny. also, just my $0.02
eric