ROW 110 Front Driveshaft Length Fuzzy Math - Defender Source
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  #1  
Old April 4th, 2010, 06:06 PM
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ROW 110 Front Driveshaft Length Fuzzy Math

So when I went to drop my front driveshaft in my '83 110 with Disco drivetrain I noticed it was at full compression and I literally had to pry it out. The driveshaft I have is 26 3/4" at compression, with 4 3/4" of total spline length at the end. I have a roughly 2-3" lift. How much should I shorten the driveshaft? I will have more axle droop than compression, so I was thinking of shortening it roughly an 1-1/2"

Thoughts?
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  #2  
Old April 4th, 2010, 07:23 PM
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Guess its a lucky thing this truck hasn't been off road.....
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Old April 4th, 2010, 07:27 PM
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Quote:
Originally Posted by Maryland 110 View Post
Guess its a lucky thing this truck hasn't been off road.....
Absolutely! When I was prying it out I could see the motor and tranny/tcase move around. It's heading on a big off road trip in a few weeks so I am in the midst of installing ARBs and came across this driveshaft issue by chance. Glad I did. Imagine coming down hard on the front end.
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Old April 4th, 2010, 07:57 PM
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yeah, your motor and trans mounts will thank you for sure..
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Old April 4th, 2010, 09:45 PM
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Jonathan, take a tape measure and a floor jack and measure the shortest and longest distance you can get by getting full droop on the rhs wheel. I assume this will be the longest length. You may need to ratchet strap the axe to the frame to get the shortest length too.

But off the cuff, I think 1.5 sounds too much. Maybe 1/2 to 3/4 shorter? Like you said, more droop than compression.

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Old April 5th, 2010, 06:57 AM
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you might want to remove the springs and reconnect the shocks and cycle the suspension. Very hard to get a full range of motion with the springs in place. Your good with the 1.1/2" from the shortest length.

Often find things I didn't think would be an issue....brake lines....bushing issues etc when doing this.
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Old April 5th, 2010, 08:41 AM
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what Matt said. You can't get any real compression unless you pull the springs out. Another thing that may be worth looking at is wheter there is any adjustments in the drivetrain mounting. When I put in my Tdi I had the engine and trans adjusted as far forward as possible on the (about) 3/4" long slots in the mounting brackets. Front driveshaft would not fit so I had to adjust the position. I know your mountings are non-standard so not sure if this is possible. But could be cheaper than cutting and rebalancing a shaft. And your front shaft will remain stock, assuming it is now.
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Old April 5th, 2010, 09:07 AM
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Agreed removing the springs sounds like a good way to measure. But my point is measure don't guess!
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Old April 5th, 2010, 03:04 PM
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Is the rear one too short too?
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Old April 5th, 2010, 04:45 PM
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I agree with Matt. When I built my series coiler, I did that. With the funky drive train, I had a really long front shaft and really short rear shaft..
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Old April 5th, 2010, 06:14 PM
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Quote:
Originally Posted by TDI Guy View Post
I agree with Matt. When I built my series coiler, I did that. With the funky drive train, I had a really long front shaft and really short rear shaft..
Gotta double check the length, but it recall it compressed more than enough.
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