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I have a 94 hb ext. cab 2wd with the KA24E and 5 speen tranny and 174000 miles. It runs great but at about 65 mph I get this pulsating roaring noise. It was there before I had to put a new tranny in it, now that the new tranny is in it is worse. I checked the from and back wheel bearing and they are fine.

Any body have any suggestions on what it is?
 

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certain tires with rough tread patterns will roar at hwy speeds. this would be unlikely on a two wheel drive but i don't know what kind of tires you might be running. also check the rear end, if its low on oil you may have damage to the gears.
 

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...sounds like its probably not the transmission...since the noise is still there after putting a new one it. I would think tires/wheels. Think about new tires...or maybe getting the current ones balanced. Another thing to rule out he tranny, does the noise change any between 4th and 5th gear. Get to 65 and maintain that speed, then down shift to 4th, and maintain the speed. If no change in sound, then at least that rules out 4/5th gears...
 
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