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Hi All, Wonder if anyone can help me with this, PRM80 gearbox whining in forward and reverse, attached to a Isuzu three cylinder 3LB1. The story so far! Had a lot of gear rattle at low speeds, suspected drive plate deterioration so ordered a high deflection R&D. also clutch was slipping on first use, fine once oil warmed up, decided to change the oil to see if that would help, I'd always used engine oil as per the manual but discovered that PRM now advise using ATF so that's what I used, ATF seemed to help a little and we cruised on for another day and a half to pick up the drive plate, I changed the drive plate (on the cut) dropped her into gear and the whine started, first thought was drive plate tight and maybe it would wear in so we headed home, however five days later and the whining was still there. Once home I decided to remove the gearbox and check it out, I've changed the clutch cone, the input and output bearings (although they seemed fine, as did everything else in there) The gearbox is now back on and still whining! I'm sure it's the box as I can hear it with a sound stick but why would changing the drive plate cause the gearbox to whine? or is it the ATF? I've thought about putting the old drive plate back on but to be honest I'm sure it's not that making the noise, it's the box, I know that straight cut gears (as fitted in the PRM80) can whine but they never have before, well only slightly at high engine speeds on the river but nothing like this, anybody have any ideas because I'm stumped. Thanks.
