6" lift driveline vibes?
#21
Contributing Member
It doesn't do much good to lengthen the links to a new location if you are using the stock spring configuration. It can only flex so much, so there is no reason to create more articulation than the spring would allow. Creating new mounts further away would only be beneficial if if you were going to use a dual action coil-over or an offroad type spring.
#23
Registered User
iTrader: (1)
It doesn't do much good to lengthen the links to a new location if you are using the stock spring configuration. It can only flex so much, so there is no reason to create more articulation than the spring would allow. Creating new mounts further away would only be beneficial if if you were going to use a dual action coil-over or an offroad type spring.
Thanks in advance.
#24
Registered User
The factory setup is actually a 5 link with regards to the axle connection points.
- Two upper control arms.
- Two lower control arms.
- Track bar (aka panhard par).
Jeeps (TJ's) are the same.
I did a 3~4 link (and some other "fancy" stuff with the lower arms) and was fine as a DD.
Fred
#25
well i took off the rear driveshaft, drove at about 50mph, the vibes are gone. only problem is the t-case output is loose and leaking tranny fluid.
does the transmission and t-case share fluid or is it seperate? its an a340-h.
im gonna get a cv off of a stock front drive shaft and take it to a shop and have them put it on the rear and balance it, hope that fixes the problem. also gonna have to fix the t-case output.
does the transmission and t-case share fluid or is it seperate? its an a340-h.
im gonna get a cv off of a stock front drive shaft and take it to a shop and have them put it on the rear and balance it, hope that fixes the problem. also gonna have to fix the t-case output.
#26
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I, meaning me, wouldn't do that.
Normal u-joints go through acceleration and deceleration while spinning at an angle. On a typical driveshavft, the joints at the ends are installed in such a way that as one of the joints is accelerating, the other is decelerating thus keeping a consistant rotational speed at the input to the axle. Installing a CV (constant velocity- note the name?) on only one end will result in the accel/decel of the u-joint on the other end not being cancelled and consequently a 'surging' of the rear wheels while you're moving / in gear.
Normal u-joints go through acceleration and deceleration while spinning at an angle. On a typical driveshavft, the joints at the ends are installed in such a way that as one of the joints is accelerating, the other is decelerating thus keeping a consistant rotational speed at the input to the axle. Installing a CV (constant velocity- note the name?) on only one end will result in the accel/decel of the u-joint on the other end not being cancelled and consequently a 'surging' of the rear wheels while you're moving / in gear.
#27
Registered User
well i took off the rear driveshaft, drove at about 50mph, the vibes are gone. only problem is the t-case output is loose and leaking tranny fluid.
does the transmission and t-case share fluid or is it seperate? its an a340-h.
im gonna get a cv off of a stock front drive shaft and take it to a shop and have them put it on the rear and balance it, hope that fixes the problem. also gonna have to fix the t-case output.
does the transmission and t-case share fluid or is it seperate? its an a340-h.
im gonna get a cv off of a stock front drive shaft and take it to a shop and have them put it on the rear and balance it, hope that fixes the problem. also gonna have to fix the t-case output.
Fix that and then re-install the driveshaft.
Yes, the fluid in the xfer case is shared with the tranny.
Fred
#28
Registered User
I, meaning me, wouldn't do that.
Normal u-joints go through acceleration and deceleration while spinning at an angle. On a typical driveshavft, the joints at the ends are installed in such a way that as one of the joints is accelerating, the other is decelerating thus keeping a consistant rotational speed at the input to the axle. Installing a CV (constant velocity- note the name?) on only one end will result in the accel/decel of the u-joint on the other end not being cancelled and consequently a 'surging' of the rear wheels while you're moving / in gear.
Normal u-joints go through acceleration and deceleration while spinning at an angle. On a typical driveshavft, the joints at the ends are installed in such a way that as one of the joints is accelerating, the other is decelerating thus keeping a consistant rotational speed at the input to the axle. Installing a CV (constant velocity- note the name?) on only one end will result in the accel/decel of the u-joint on the other end not being cancelled and consequently a 'surging' of the rear wheels while you're moving / in gear.
With a CV joint on the xfer case of the driveshaft and a normal u-joint on the axle end, the rear diff pinion will need to be adjusted such that the u-joint angle is straight and all of the angle is born by the cv joint.
Fred
Last edited by FredTJ; 01-23-2009 at 02:31 PM.
#29
i looked through the FSM i downloaded, and cant seem to find how to take apart the t-case. The actual nut holding on the output flange is loose, but cant spin because of a little indent thats pressed into the side. I dont think it couldve come loose over time, its probably from the driveshaft vibrating, thats made it worse.
and running a cv in the rear driveshaft has been done many times, but i did notice the 'surging' you mentioned when i was driving around in front wheel drive.
and running a cv in the rear driveshaft has been done many times, but i did notice the 'surging' you mentioned when i was driving around in front wheel drive.
#31
Registered User
iTrader: (1)
Just be prepared that after you tighten the flange, check and repkace the t-case out put bearing as it could be prematurely worn from DS vibes. Specially if you have slop and the nut is still staked.
That you'll need to still check DS angles. If you need to go with a CV shaft you'll have to adjust the pinion so it points at T-case.
That you'll need to still check DS angles. If you need to go with a CV shaft you'll have to adjust the pinion so it points at T-case.
#32
i checked the seal behind the flange, it was fine so i just tightened the nut. Theres no slop in the flange now either. The vibes are alot better, but there is still a little so i think ill get a cv joint put on the drive shaft and adjust the pinion angle.
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