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.
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
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.
...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.
Vibration? Bump steer? Wandering? Read the article (sticky) on Steering, suspension, and driveline.
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.
'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff. http://www.jeepskate.net
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.
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.