93 wrangler drive line angle - JeepForum.com
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Unread 08-05-2013, 06:46 PM   #1
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1993 YJ Wrangler 
Join Date: Jul 2013
Location: Spring hill, Florida
Posts: 5
93 wrangler drive line angle

I just put a 2.5 lift in my 93 6cyl 5 speed and I needed to lower the t\c about 3\4 inch to remove vibration in the gears. I measured the driveline angle and it is 18 degrees. Is it correct?

Any responses will be appreciated.

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Unread 08-06-2013, 07:19 AM   #2
Web Wheeler
1995 YJ Wrangler 
Join Date: Feb 2013
Location: Austin, Texas
Posts: 1,827
Ok...I'll take a stab at this...

Are you sure that the vibration is due to the driveshaft angle? Are all your U-joints front and rear good? Motor mounts good? Transmission mount? Any other looseness in your drivetrain? If so, fix those problems first.

I'm not a big fan of TC drops. It's seems counterproductive to raise the Jeep for ground clearance, and then drop the TC to reduce ground clearance. I think of them as a temporary fix until an SYE can be installed. Unless, it's just a street rod or mall crawler, and you don't mind the lower ground clearance.

That being said, just buy some longer bolts and buy or make 3/4" spacers. There's no need to buy an expensive TC drop kit, IMO. Some pipe or tubing cut to the right length would work fine as a spacer. You might be able to find some 3/4" long pipe nipples. I've found that Tractor Supply has the best selection of bolts in my area. It won't cost much or take much time to try this fix...

A better solution over dropping the TC is a 1" body lift and 1" motor mount lift. This also gives you more clearance for your oil pan.

Even better is an SYE/new driveshaft.

The best (and most $$$) would be an SYE/new driveshaft with a 1" body lift and 1" motor mount lift.
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Unread 08-06-2013, 07:28 AM   #3
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1993 YJ Wrangler 
Join Date: Aug 2011
Location: Black Hills, South Dakota
Posts: 609
I didn't measure any angles, but I had vibes when I was running the pinion shims and TC drop with my BDS 3.5" lift. I did a SYE kit, got rid of the drop and upped to 8* pinion shims and it's gone.
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Unread 08-06-2013, 09:48 AM   #4
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1989 YJ Wrangler 
Join Date: Nov 2010
Location: Sin City, Nevada
Posts: 2,881
Go to http://4xshaft.com/

Halfway down the page Technical Information and Sponsorships grey banner. Go in their and do some reading before you get all wrong on this. Here are a couple of pictures to help out.

Which driveshaft do you have pick the right picture and get your pinion angle lined up like the picture.

It works and with an angle finder you need to know the right angles and be within 2 degrees low to account for axle wrap on start up.
2joint_angle.gif   cv_angle.gif  
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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Unread 08-06-2013, 03:02 PM   #5
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1990 YJ Wrangler 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
Also, check here: Driveshaft geometry, for information on how to measure and calculate the angles.

In the tech info section on the Tom Woods (4xshaft.com) website, the "Slopes vs. Angles" page will have tips on points to measure angles.
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