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ZF6 Will Not Pressurize Cooler Lines
Alright guys, this weekend I found myself sifting through old threads looking for an answer and couldn't come up with anything. So I'm hoping to bounce ideas off someone who has been inside this 6 speed manual tranny. I recently purchased a 2001 F250 and spent alot of time getting things back to par. In the process of an engine swap my mechanic and I realized this transmission is not pumping fluid. For 5K miles prior to my engine failing I regularly pulled a roughly 8K pound boat over a 300 mile round trip journey to the coast with no problems. But now that I know there is a problem I'm concerned. Since finding this issue I've made the same trip twice stopping a few times to check the tranny with a infrared thermo and the temp IS NOT spiking AT ALL. Not even on steep grades. My mechanic is telling me there is probably a pickup that is displaced or a pump failure but enough fluid is being moved internally to avoid an overheat. I'm hesitant to tear a truck down that's in operation; I need to know where to start looking for an issue before we proceed.
My apologies for the wordy description, tell me if specific info is needed. But otherwise what's are the thoughts out there?????