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  #21  
Old September 26th, 2014, 11:14 AM
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Phillip
1995 SW #487/500
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Quote:
Originally Posted by 1of40 View Post
Did you have a vibe/growling sound in the rear when you were going highway speeds and needed to let up on the gas? Also, are you running a stock rear drive shaft as well?

Clay

Yes and Yes

When I get back to my truck Ill get some measurements and photos. Its not Lexus smooth but its a defender.

I had the same issue when I put the LT230 and springs on my Classic, I was surprised because the wheelbase is longer. A set of Rovertracks rear links fixed it.
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  #22  
Old September 26th, 2014, 11:40 AM
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The real question is the pinion angle:

Is it perfectly horizontal or is it angled up, and if so, how far up is it angled? Is it angled at exactly the same angle as the driveshaft? Higher or lower?
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  #23  
Old September 26th, 2014, 12:17 PM
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Quote:
Originally Posted by sonoronos View Post
The real question is the pinion angle:

Is it perfectly horizontal or is it angled up, and if so, how far up is it angled? Is it angled at exactly the same angle as the driveshaft? Higher or lower?
IIRC it is closer to horizontal. It has been six or seven years since I dealt with the no load growl and vibrations from the OME suspension.
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  #24  
Old September 26th, 2014, 12:38 PM
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John B.
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You want it to be parallel with the transfer case output.
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  #25  
Old September 26th, 2014, 01:26 PM
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Strangely my rear pinion angle is parallel with the tcase output and it still has the groan on throttle let-off. I have been running without my front driveshaft so I definitely know it's my rear driveline.

Also in 1st gear between 0 and 5 mph, the transmission has a strong low-frequency, high amplitude side to side vibration which disappears after I go above 5mph. No other vibes even at 65-70mph.

At Conclave, I looked at other people's rear diffs and pinions are not anywhere near parallel with the tcase output. Most of them were pointed up perhaps 5-8 degrees from horizontal. Is this what the stock rear pinion angle is like? I understand that there are actually two ways to run UJ shafts: with the pinion angles parallel, or the driveshaft-pinion angles the same for both pinions.

Any ideas, John? Could it be my pinion bearings?
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  #26  
Old September 26th, 2014, 01:37 PM
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John B.
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No idea. You need to inspect everything. U-joints, slip joint play, bearing play. Are the u-joints in phase? IME, driveshaft problems show up at 30 to 50 mph. Also look for loose suspension joints and gearbox/engine mounts.

A normal driveshaft with two u-joints is best with parallel flanges.
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