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  #1  
Old April 29th, 2008, 09:12 PM
CDeWan
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Clay DeWan
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Smile helical gears and Axle question

Newbies....don't ya hate them. Anyway wanted to confirm that the transfer boxes from a 1999-2003 Discovery II (I think) have Helical gears as opposed to the straight cut in the defenders thus reducing drive line noise. Am I on-base or inhaling to much exhaust.
Also is it an easy swap - one transfer case for the other?

My drive line on the D-90 has 279,000 miles on it so things are going to start needed an upgrade/swap.

O.... Also is there a better set of swapable axles from a Disco or Disco II to a 1994 D90? Possibly a better ratio for highway driving or....

Thanks guys for your help.
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  #2  
Old April 29th, 2008, 10:08 PM
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rover4x4
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Phillip
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thats a shitload of miles how many times has it been rebuilt?
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Old April 30th, 2008, 12:05 AM
CDeWan
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Clay DeWan
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would you believe - None! The first owner ran nothing but Amsoil and sent the oil out to get checked periodically for particles. I put the last 20,000 on the motor from 7/06 - today. The previous owner put 10,000 from 2000 7/06 and the other 250,000 was put on by owner number 1.
Gear #2 did go last year so I switched to an LT85.
I am running Mobil one so hopefully I can keep the motor going.
What is the typically expectation on these (3.9L) for mileage?
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  #4  
Old April 30th, 2008, 10:56 AM
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revor
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Keith Kreutzer
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You would want a "Q" Box that came in Discovery 2's and even 1's they will only be in the 1.22 ratio.

You have an LT230T in your truck.. Be sure to get a Q box with a Diff loc. They are Identical so the swap would be uneventful.

You already have the tallest diff gears in your truck. at 3.54:1. I would suspect that with a higher ratio you would be disapointed with the performance and your would cause additional stain to your already senior engine.

The 3.9 could go as long as any other V8 is properly maintained.
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