I have a 1950 3/4 ton. I just rebuild the enclosed portion of the driveshaft, installing carrier bearing and seals. I also drained and replaced the transmission fluid (4 spd.). I used 80W-90 weight lube. I just drove it and now it makes this terrible growling noise when I let off the gas to shift. It doesn't always do it but just about. Seems to do it regardless of whether I shift or not. I don't even have to push the clutch in. Most of the time it happens when I let off the gas. Sometimes it will go away when I step on the gas again.
Anyone think it could be the incorrect type of fluid???? Otherwise, for the most part the tranny shifts fine. It was running fine before I did the work on the driveshaft and fluid change.
Any help is appreciate as I'm getting really depressed with all the things breaking on this truck. Just as I think I have it fixed, something new breaks.
