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Unread 03-31-2012, 05:51 PM   #1
Ollie09
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Rear drive shaft angle?

Does the angle of the rear driveshaft on my 83' CJ7 look correct? Seems kind of steep. There is no body on it so I assume it will come down a little with the added weight but this just doesn't look right.





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Unread 03-31-2012, 05:55 PM   #2
Mean Max
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Looks kind of steep to me too. Have you used an angle finder to determine how many degrees of deflection on the u-joint?

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Unread 03-31-2012, 05:55 PM   #3
LT1CJ7
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Your gonna need a CV shaft.
It'll come down a little when its all back together, but not what you need.
I'd recommend looking up Tatton drive shafts on ebay-
Here ya go.
http://www.ebay.com/itm/JEEP-CV-DRIV...#ht_2259wt_803
don't order it until your nearly all reassembled.
You'll also need to point the pinion 2 lower than the T-case output yolk.
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Unread 03-31-2012, 06:08 PM   #4
Ollie09
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Quote:
Originally Posted by LT1CJ7 View Post
Your gonna need a CV shaft.
It'll come down a little when its all back together, but not what you need.
I,d recommend looking up Tatton drive shafts on ebay-
The suspension is all original and stock stuff. I'm doing a frame off, with no modifications. I don't remember it being this steep when I took it apart, but I didn't pay much attention to it.
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Unread 03-31-2012, 06:15 PM   #5
LT1CJ7
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If it's not NOS, then it's not original parts.
Maybe set 250-300 lbs on the rear cross member and see what your angles are.
That looks extremely steep for stock replacement parts.

Btw, looks like your doing an excellent job on the resto.
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Unread 03-31-2012, 06:28 PM   #6
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Here is a diaghram of the Proper Geometry For the 2 types of drive shafts.
3 joint drive shaft. (A.K.A. double cardon joint and a single joint shaft)

A shaft with 2 single joints

(photos from Tom Woods Drive shafts)
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Unread 03-31-2012, 06:43 PM   #7
gojeepin
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For stock springs that looks too high (even for no body weight). Are your suspension components too tight to allow the suspension to move?

If your angle remains that steep, you'll need to angle the pinion up and use a double cardan driveshaft.

I have some better diagrams for suspension, steering, and driveline angles if you want to look at them... link in signature block.
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Unread 03-31-2012, 11:27 PM   #8
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Agree, it's too steep.
7* - 12* for traditional shaft.
12* being the max before you have to get yourself into a CV shaft.
And wait till you get the body back on with most of your weight on the chassis to point your pinion up and order the shaft.
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Unread 04-01-2012, 05:11 AM   #9
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Quote:
Originally Posted by LT1CJ7 View Post
Your gonna need a CV shaft.
It'll come down a little when its all back together, but not what you need.
I'd recommend looking up Tatton drive shafts on ebay-
Here ya go.
http://www.ebay.com/itm/JEEP-CV-DRIV...#ht_2259wt_803
don't order it until your nearly all reassembled.
You'll also need to point the pinion 2 lower than the T-case output yolk.
X2, love my tattons
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I used Marvel once before I took my Jeep out on the trails. I didn't get stuck all weekend so I guess it works.
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Unread 04-01-2012, 08:13 AM   #10
Ollie09
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Quote:
Originally Posted by LT1CJ7 View Post


If it's not NOS, then it's not original parts.
Maybe set 250-300 lbs on the rear cross member and see what your angles are.
That looks extremely steep for stock replacement parts.

Btw, looks like your doing an excellent job on the resto.
Thanks for the compliment\
The parts are what came on the Jeep when I bought it which was all original. I think maybe I understand what happened. I tightened up all the suspension joints with no weight on it (I know better!!). I will loosen everthing up and not retighten until the body is back on.

Thanks to all.
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Unread 04-01-2012, 08:15 AM   #11
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Quote:
Originally Posted by bbc View Post
Agree, it's too steep.
7* - 12* for traditional shaft.
12* being the max before you have to get yourself into a CV shaft.
And wait till you get the body back on with most of your weight on the chassis to point your pinion up and order the shaft.
How do I change the pinion angle?
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Unread 04-01-2012, 08:17 AM   #12
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Quote:
Originally Posted by Ollie09 View Post
How do I change the pinion angle?
to sum it up, cut the spring perches off and reweld em on after turning the pinion up
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Quote:
Originally Posted by my_304_cj7 View Post
I used Marvel once before I took my Jeep out on the trails. I didn't get stuck all weekend so I guess it works.
SSG David Mejias, SSG Eric Vick, SGT William Bowling, SGT Robert McDowell
1 April 2007
Rest In Peace Brothers
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Unread 04-01-2012, 08:17 AM   #13
gojeepin
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Quote:
Originally Posted by Ollie09 View Post
How do I change the pinion angle?
Either use degree shims or cut off the old perches to weld new ones at the proper angle.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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