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Discussion Starter #1
I've been reading that some whine at speed seems to be normal on the P38 with many owners here. As this is my first P38 I'm trying to understand it. I have a good amount of whine at speed that I would guess is from the diff or drive train. But when I let off the gas at 55 or so it stops. Back on the gas it's there. I would wager if it is the diff or drive train it would be present even when letting off the gas. The engine is quite smooth and at park when rev'd there is no noise ala whine or the like. I changed front and rear diffs with Mobil 1 75w90 and lubed the ujoints and shafts. I'm familiar with bad wheel bearings and this is not that kind of noise. Could this be the tranny?
 

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Does it change with engine speed or road speed? With engine speed it could be an idler pully. With road speed it could be a UJoint. Both will stop when letting off the gas.
 

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Discussion Starter #3
rrtoadhall said:
Does it change with engine speed or road speed? With engine speed it could be an idler pully. With road speed it could be a UJoint. Both will stop when letting off the gas.
That's a tough one. I don't notice a higher pitch with more speed but do notice it more at speed if that makes any sense. I guess now it does point to ujoints.
 

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Give your UJoints a good heavy pump of grease and see if it changes. IF it changes a UJ job may be in your future. IF it doesn;t then you have atleast checked one more thing off your maintenance sheet. :thumb:
 

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Discussion Starter #5
rrtoadhall said:
Give your UJoints a good heavy pump of grease and see if it changes. IF it changes a UJ job may be in your future. IF it doesn;t then you have atleast checked one more thing off your maintenance sheet. :thumb:
Already lubed them a week ago to no avail.
 

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I say differential unit, seems to be a mix of front and rears, only cos I do them so often.
 
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