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Unread 09-18-2011, 09:33 AM   #1
CrackSlinger
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1997 TJ Wrangler 
 
Join Date: May 2011
Location: Floral Park, NY
Posts: 69
Forward driveshaft clanging like crazy

Hi everyone,

I'm working through some problems that are current on a beautiful 97 TJ that I picked up a few months ago. I'm working through them one at a time. The guy who owned it before me lifted it 4" with a lot of patches, and jerry rigged methods.

For one, instead of installing an SYE and DC driveshaft on the rear, he installed what looks like a transfer case lowering kit in order to drop the slip yoke a few degrees, and rotated the rear axle pinion up a few degrees in order to line it up parallel with the plane of the dropped t-case. Vibrating, sure, but running well enough that for now I'll hold off on dropping the 6-700 bucks needed to get it running properly with the new drive shaft.

Well, driving around town I had an annoying rattling and squealing coming from under the jeep, it was driving me crazy and I spent a lot of hours under there pushing and pulling, finding loose parts and clamping things down as I found them. I replaced the U joints on the rear drive shaft, found they were in pretty good shape and the sound didn't change at all.

Well, I put the truck in 4H and took it for a test drive around the block, and DANG DANG DANG DANG goes the front end. Whoops, I thought, the banging I've been hearing is the forward drive shaft turning at low torque while I'm in 2H on the road. So as an experiment, I took the front shaft off completely last night, took it for a test drive, and lo and behold the sound is completely gone.

I did a nice inspection of the shaft - I'll post pictures of it when I dig out my camera. All of the U joints are rusted to hell and the overall quality of the shaft is pretty rough - pitted metal, rotten joints, etc. Also, I realized that the t-case lowering kit, while serving to drop the rear angle a little to line it up with the rear pinion, only served to increase the angle on the front end of the t-case... likely bringing the front driveshaft out of it's permissible range of angular engagement.

Like I said, hack work.

So what do you think? The obvious thing to me is to install the proper drive shaft kit on the rear, level out the transmission, and re-install the front shaft with new U joints. Make sense? Am I missing anything?


Thanks a lot

Keith

PS How do I upgrade my membership?

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Unread 09-18-2011, 09:42 AM   #2
djfuzzy
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Join Date: Jun 2004
Location: Twenty-nine Palms, California
Posts: 1,219
http://www.stu-offroad.com/axle/driv...iveshaft-1.htm

And yes, fix those driveline angles with an SYE, driveshaft and adjustable rear uppers.
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Unread 09-18-2011, 09:53 AM   #3
mrblaine
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1999 TJ Wrangler 
 
Join Date: Dec 2004
Location: Quail Valley, California
Posts: 25,693
Quote:
Originally Posted by CrackSlinger View Post
Hi everyone,

I'm working through some problems that are current on a beautiful 97 TJ that I picked up a few months ago. I'm working through them one at a time. The guy who owned it before me lifted it 4" with a lot of patches, and jerry rigged methods.

For one, instead of installing an SYE and DC driveshaft on the rear, he installed what looks like a transfer case lowering kit in order to drop the slip yoke a few degrees, and rotated the rear axle pinion up a few degrees in order to line it up parallel with the plane of the dropped t-case. Vibrating, sure, but running well enough that for now I'll hold off on dropping the 6-700 bucks needed to get it running properly with the new drive shaft.

Well, driving around town I had an annoying rattling and squealing coming from under the jeep, it was driving me crazy and I spent a lot of hours under there pushing and pulling, finding loose parts and clamping things down as I found them. I replaced the U joints on the rear drive shaft, found they were in pretty good shape and the sound didn't change at all.

Well, I put the truck in 4H and took it for a test drive around the block, and DANG DANG DANG DANG goes the front end. Whoops, I thought, the banging I've been hearing is the forward drive shaft turning at low torque while I'm in 2H on the road. So as an experiment, I took the front shaft off completely last night, took it for a test drive, and lo and behold the sound is completely gone.

I did a nice inspection of the shaft - I'll post pictures of it when I dig out my camera. All of the U joints are rusted to hell and the overall quality of the shaft is pretty rough - pitted metal, rotten joints, etc. Also, I realized that the t-case lowering kit, while serving to drop the rear angle a little to line it up with the rear pinion, only served to increase the angle on the front end of the t-case... likely bringing the front driveshaft out of it's permissible range of angular engagement.

Like I said, hack work.

So what do you think? The obvious thing to me is to install the proper drive shaft kit on the rear, level out the transmission, and re-install the front shaft with new U joints. Make sense? Am I missing anything?


Thanks a lot

Keith

PS How do I upgrade my membership?
Hack work? You just described half the modified jeeps on this board.
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