Sounds like mine... I had a cracked filter neck and it would do the same thing. It tore up my 5-6k mile old tranny and ended up replacing it. I personally wouldn't waste the money on fluid and a fliter cause even if it does work for a while the trans life is probably way way shortened. I replaced my filter and fluid and cleaned all the mud/metal out of the pan filled it back with new fluid and it went a couple weeks and lost 2nd gear then about 3 weeks and it lost 4th gear. My $102.50 4t65e-hd from pullapart is still going strong...
