I have a 90 f150 4x4 and i noticed awhile back that it had a noise coming from the transmission when i first started it for about a minute. After a few more days it kept making the noise even while i drove the truck and someone thought that it might be the flywheel since it was making the noise right from that area of the tranny. I took it all apart and the flywheel is perfectly fine and I had the started tested and its fine so I was wondering if anyone had any suggestions to what could be wrong with it.

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TJ