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Unread 03-30-2009, 11:49 AM   #1
redflame6
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Join Date: Oct 2006
Location: Saucier, MS
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Drive shaft

Just put a 4" on my cj7 which already had extended shackles. My front drive shaft is now too short. It is only about 1 1/2" in the spline. Is there another drive shaft compatable that I can mix with mine to make it longer or use the whole thing. Or is my only option to buy a new shaft.

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1980 CJ7. 258ci, T4, Dana 300, Bestop supertop, Smittybilt XRC10, Hi-lift xtreme, 4" superlift, 33x12.5 Treadwright retreads, Crown extended brake lines.

1994 ZJ Loredo 5.2l, Pro Comp lift, 31x10.5, Painted Black Cladding, Painted Black Rims
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Unread 03-30-2009, 12:16 PM   #2
j33pman
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how long are your shackles?

I had a 4" superlift with stock shackles and have never had a driveshaft problem.
In fact I just went SOA with stock leaves, about 5.5-6 total lift, front shaft is still good
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Unread 03-30-2009, 12:24 PM   #3
redflame6
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Not sure but front shaft is extremely loose and pretty worried about it coming off. bolt to bolt I believe they were 6" (shackles)
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1980 CJ7. 258ci, T4, Dana 300, Bestop supertop, Smittybilt XRC10, Hi-lift xtreme, 4" superlift, 33x12.5 Treadwright retreads, Crown extended brake lines.

1994 ZJ Loredo 5.2l, Pro Comp lift, 31x10.5, Painted Black Cladding, Painted Black Rims
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Unread 03-30-2009, 12:54 PM   #4
j33pman
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I almost wonder if the shaft is damaged
6" shackles are pretty tall, that's twice the length of stock.
I don't know if thats enough to damage a driveshaft, maybe it just need to be replaced.
Measure your shaft from yoke to yoke at ride height and post it up on here
when you get a chance
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Unread 03-30-2009, 01:09 PM   #5
redflame6
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33" from outside edge of each yoke. like i said that is almost completely spread out.
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1980 CJ7. 258ci, T4, Dana 300, Bestop supertop, Smittybilt XRC10, Hi-lift xtreme, 4" superlift, 33x12.5 Treadwright retreads, Crown extended brake lines.

1994 ZJ Loredo 5.2l, Pro Comp lift, 31x10.5, Painted Black Cladding, Painted Black Rims
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Unread 03-30-2009, 06:15 PM   #6
twistedcj
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Not to add insult to injury, but after you cure the driveline issue, you will have to adress your caster problem. The new springs would have been arched to give descent caster back to the front axle. With your 6" shackles, you have just turned your knuckles "down." That's gonna make the jeep steer funny. It won't want to center, it'll wander, etc. Been down this road myself. Get rid of the lift shackles, and put some close-to-factory length stronger ones back on. Make sure the shackles have enough swing for the length of spring when it compresses and extends. You don't want them to bind or flip back under the spring and bind onto the frame. Good luck.
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Unread 03-30-2009, 07:15 PM   #7
gojeepin
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Quote:
Originally Posted by twistedcj View Post
...you will have to adress your caster problem. The new springs would have been arched to give descent caster back to the front axle. With your 6" shackles, you have just turned your knuckles "down." That's gonna make the jeep steer funny. It won't want to center, it'll wander, etc. ...

Not always, the RE HD 4.5" lift has 6.75" shackles. Yes, it needs that much to flex (flatten). Don't assume a longer shackle will cause caster problems.

I did grind a little off the base of the perches to add some caster but it wasn't a huge amount. My caster was about 3.5* but I took it back to 6*.

One of these days I'm going to post diagrams about mechanical trail.
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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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Unread 03-30-2009, 10:00 PM   #8
jeepskate
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That's a matched setup versus disparate parts tossed together...good bet he just screwed up his caster as the vast majority of lift springs are little to no longer than stock springs.
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Unread 03-31-2009, 08:10 AM   #9
deadeye
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you have two choices either take it to a driveshaft shop that can retube it to make it longer or buy a new custom one. If yours is that sloppy in the splines a new one is what you need.
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Unread 03-31-2009, 04:17 PM   #10
redflame6
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Thanks deadeye. I will look into a new one from Tom Wood's. As far as wondering. It does. And I know it is from the shackles which were on by previous owner. Not my desperate attempt to throw parts together. I am going to put it together right. Just needed advice on it. Thanks.
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1980 CJ7. 258ci, T4, Dana 300, Bestop supertop, Smittybilt XRC10, Hi-lift xtreme, 4" superlift, 33x12.5 Treadwright retreads, Crown extended brake lines.

1994 ZJ Loredo 5.2l, Pro Comp lift, 31x10.5, Painted Black Cladding, Painted Black Rims
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Unread 03-31-2009, 06:46 PM   #11
gojeepin
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I found that the Grand Cherokee front driveshaft was exactly the size I needed. So I found one on eBay.

Check your compressed and extended length. If there's a shaft that's already that length you don't need to have one built... unless you just want a "new" one.
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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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Unread 03-31-2009, 08:15 PM   #12
CjinPA
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I have a front drive shaft that I will sell from an 83 CJ7 that had an auto trans in it. The driveshaft measures collapsed 33" from u-joint centers, and extended 36" from u-joint centers. Let me know if it will work for you.



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