Rear drive shaft angles - JeepForum.com
 
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post #1 of 4 Old 08-23-2019, 01:59 PM Thread Starter
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Join Date: Sep 2018
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Rear drive shaft angles

I have a 2.5 in suspension lift, 1 inch body lift and dropped the transmission 1 inch by lowering the skid plate. Then I attached the rear drive shaft. The angle looks to severe and the slip yoke is out quit far. Right now the rear end is on jack stands. I’ve included a couple of pics. This is my first build, any help?

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post #2 of 4 Old 08-26-2019, 09:12 AM
mikewiz38
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1994 YJ Wrangler 
 
Join Date: Jun 2018
Posts: 290
I'm not an expert but recently have gone through some driveshaft headaches. I did a 1" shackle lift, and that's it. It wasn't supposed to mess anything up but I had a vibration from 30 to 40/45mph's. To my surprise, the drive shaft was at the wrong angle because of the lift. I dropped the transfer case/trans skid plate 1" and it fixed the problem.

There's more math involved because when I asked about it, they wanted to know my transmission angle, differential angle, and driveshaft angle. You plug it in and I guess it tells you if it's good or bad.

So for me, personally...even though a 1" lift shouldn't require anymore modifications, I had to on mine. And my driveshaft, before the transfer case drop, was sitting at about a 19/20 degree angle. After I dropped the transfer case an inch, it was sitting at a 14 degree angle, which fixed my vibration issue.

Oh, and I'm not exactly sure if it's good to measure the degrees of things without the tub and weight on the vehicle. I would think that when you add the weight of everything, the angles are going to change.

1994 Wrangler YJ - 4.0L - 5 Speed

Last edited by mikewiz38; 08-26-2019 at 09:13 AM. Reason: Added last paragraph about weight.
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post #3 of 4 Old 08-26-2019, 10:41 AM
adiubald
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1995 YJ Wrangler 
 
Join Date: Apr 2013
Location: Jackson
Posts: 108
Your jeep needs to be a little more assembled to assess the final driveshaft angle - So that the suspension is carrying the full weight of the vehicle. Hard to say if what you have now is what you'll end up with when its all back together. With the full load of the jeep you can determine if your transfer case drop is enough or if you need to add axle shims (and what angle shims you need).
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post #4 of 4 Old 08-27-2019, 08:52 AM Thread Starter
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Thanks for the feedback. I have the tub on now and will reassess once assembled.
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