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ryanheacox · 06-21-2019, 02:30 PM

I've put about 700 miles on my new engine and have recently noticed a noise/vibration that has been present for a long time starting to get worse.

It is RPM dependent, can't notice it in 1st, happens around 20 in 2nd and 35-38 in 3rd. Only happens under load, backing off the gas makes the noise go away.

Initially I figured it was some sort of sympathetic vibration, something on the car was vibrating when the engine hit the right RPM. BUT, bringing the revs up in neutral does not replicate the noise.

So, now I'm thinking maybe the input shaft bearing is on the way out. I really should have taken the transmission apart when it was out of the car but I figured it's never given any trouble so don't fix what isn't broken...

It also dawned on me that this noise isn't new with the new engine. It was there before but not driving the car for almost a year made me forget about it...

What does everyone think? Do I order some bearings and drop the rear end or is there more diagnosing I can do?

06-21-2019, 02:30 PM	#1
ryanheacox Senior Member Join Date: Apr 2013 Location: Northwest CT Posts: 1,092	Transmission Bearings? I've put about 700 miles on my new engine and have recently noticed a noise/vibration that has been present for a long time starting to get worse. It is RPM dependent, can't notice it in 1st, happens around 20 in 2nd and 35-38 in 3rd. Only happens under load, backing off the gas makes the noise go away. Initially I figured it was some sort of sympathetic vibration, something on the car was vibrating when the engine hit the right RPM. BUT, bringing the revs up in neutral does not replicate the noise. So, now I'm thinking maybe the input shaft bearing is on the way out. I really should have taken the transmission apart when it was out of the car but I figured it's never given any trouble so don't fix what isn't broken... It also dawned on me that this noise isn't new with the new engine. It was there before but not driving the car for almost a year made me forget about it... What does everyone think? Do I order some bearings and drop the rear end or is there more diagnosing I can do?