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Hi everyone, im new here, and i really hope i could get some great feedback. I have a 1988 rrc turbo d with a manual gearbox. I recently swapped the old diesel engine with a lexus v8 1uz-fe paired with the original diesel gearbox. After the swap im getting very bad shakes, the wheels shake and it makes weird noises from underneath sometimes, like grinding gears. this only happens when i release the clutch in the first or reverse gear, after fully releasing the clutch it gets perfectly normal ? please help me diagnose and solve this problem ?
 

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So what would made you think a 1988 manual gear box designed for a diesel engine at around 90 HP would support a V8 petrol producing around 260 HP. Your throw out bearing is most likely failing and the pressure plate was never designed for that kind of torque and stress.
 

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Discussion Starter #3
You're right, but the gear's doing fine for now, it drives great in gear, the ratios are fine, it gets really annoying while taking off the vibration is just ugly, the grinding noise also feels like its coming from inside the housing p.s it doesn't shake in low range. ?
Yes the bell housing was replaced with the Toyota prado's housing+the input shaft, so the flywheel and the pressure plate are off a toyota 5vz.
 

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You're right, but the gear's doing fine for now, it drives great in gear, the ratios are fine, it gets really annoying while taking off the vibration is just ugly, the grinding noise also feels like its coming from inside the housing p.s it doesn't shake in low range. ?
Yes the bell housing was replaced with the Toyota prado's housing+the input shaft, so the flywheel and the pressure plate are off a toyota 5vz.

input shaft bearings perhaps, or an old worn out gear box exacerbated by the added torque, rpm and hp, in the brink of impending failure.
 
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