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Old 05-02-2011, 01:30 PM
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strange humming at 65 mph

Just fiished my axle swap and I have a strange loud humming from 63 to 66 mph. If i depress the clutch it stops. As soon as i go over 66 mph it stops. Any thoughts all bearing in front and rear just rebuilt. this started after i swaped in the rear but its not coming from the rear. sounds like front drivers side. Just had the alignment done rotated tires and filled to proper PSI. I am guessing i need to check trans and tcase. Also checked lock out hubs they r working properly.
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Old 05-02-2011, 04:24 PM
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I have a zf5 in my truck under normal operation what temp should it get up to. Should the case get hot. Its not to hot to touch but i can't leave my hand there for long.
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Old 05-03-2011, 07:16 PM
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is the humming a high pitched vibration? If so check drive drive shafts, if its a low warble check tires and rims.
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Old 05-03-2011, 07:38 PM
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Sounds like a tire out of balance but i rotated them and balanced them. Still doing it.
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Old 05-03-2011, 07:39 PM
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Quote:
Originally Posted by BrianH View Post
is the humming a high pitched vibration? If so check drive drive shafts, if its a low warble check tires and rims.
I agree you should look at the U Joints / shafts since the sound goes away when you depress the clutch. Under a load ( clutch engaged ) it could be a bearing in transmission or transfer case. How many miles on the ZF 5 spd.
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Old 05-03-2011, 07:54 PM
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It has 241k on it now. I know it reaching end life. I just found a zf5 out of a 93 diesel for $100 going to pick it up tomarrow had 110k on it but i am hoping a ujoint. Im going to put fresh flude Royal Purple synthetic ATF in the tcase and tranny tomarrow. I am still driving waiting for it to let lose so then i will know what to fix.
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Old 05-04-2011, 07:57 PM
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Just my .02, You don't want to be traveling 65 miles per hour and have a U-joint come unraveled as that can get real nasty and costly under there. U Joints aren't that expensive and if in doubt change them out. I got 165,000 out of mine and though they weren't making noise they were loose. 100 bucks for a ZF5 with that mileage is a good price. Throw another $400 bucks at the project and toss in a new South Bend or Valair Clutch especially if you are still running the factory Dual Mass.
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