Well, I got the newly rebuilt 915 transmission back in the car and hooked up everything last night. This morning I filled her up with oil and fired up. Reverse and first gear were engaged with no problems. However, as I rolled down the road, the underside of the car began making a chattering noise. It was not rhythmic - it seemed almost random and unrelated to my speed or tach. It only happens when the car is in motion and is unaffected by engaging or disengaging the clutch. I shifted through the first three gears and found that the chattering stopped abruptly when I shifted into third gear. Once in third gear, the car is quiet, smooth and happy. Shift out of third gear and she starts chattering again. I tried shifting into fourth gear, but the tranny grinded HORRIBLY whenever I went anywhere near fourth gear. This was not just balking or a little crunching...this was an awful grinding. I also noticed that second gear occassionally exhibits this godawful grinding...but with some TLC, it can be coaxed into gear without incident. Unable to use fourth gear, I never made it to fifth gear.
Any ideas? Is this stuff relatively normal after a rebuild? I am cruising here at Cluefactor Zero, Captain.
Thanks,