"slack" in driveline
#1
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Year: 2001
Model: Cherokee
Engine: 4.0
"slack" in driveline
ok here is my long and sorted tale.
I installed a 2in lift
got vibes
replace u-joints
did t-case drop (vibes kind of went away)
rear springs bent back wards (vibes return)
added 2 " AAL springs and put stock shackles back in removed t-case drop (now rides perfectly level) still vibes a little but livable.
now i have slack in my drive line, when i pull up to a stop sign and stop it "slaps" then when I take of it "slaps" its like its running slack out of drive-line? it gets worse the warmer it gets. when cold it does not really do it.
it also makes a dieseling sound when I am driving and I let off the gas, goes away when i hit the gas again. (I am thinking rear u-joint is bad from all of drive line moving)
I can grab the drive-shaft and turn it a little bit but nothing real bad.
I know I need to shim my rear axle to get the right pinion angle. could it be as simple as that or is something else wrong?
the slapping is getting pretty bad.
any thoughts?
I installed a 2in lift
got vibes
replace u-joints
did t-case drop (vibes kind of went away)
rear springs bent back wards (vibes return)
added 2 " AAL springs and put stock shackles back in removed t-case drop (now rides perfectly level) still vibes a little but livable.
now i have slack in my drive line, when i pull up to a stop sign and stop it "slaps" then when I take of it "slaps" its like its running slack out of drive-line? it gets worse the warmer it gets. when cold it does not really do it.
it also makes a dieseling sound when I am driving and I let off the gas, goes away when i hit the gas again. (I am thinking rear u-joint is bad from all of drive line moving)
I can grab the drive-shaft and turn it a little bit but nothing real bad.
I know I need to shim my rear axle to get the right pinion angle. could it be as simple as that or is something else wrong?
the slapping is getting pretty bad.
any thoughts?
#2
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Year: 2001
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With 2 inches of lift, you shouldn't need a t case drop let alone shim the axle. The vibes are bad u joints. If there's any play in the joint, then it's bad and it probably wore out from the increased pinion angle.
The t case drop kind of defeats the purpose of the lift because your belly is lower to bottoming out now. My friends got a 3 inch loft and he' fine. Check your front driveshaft too because when I was stock, my front driveshaft was destroyed and vibrated all the time
The t case drop kind of defeats the purpose of the lift because your belly is lower to bottoming out now. My friends got a 3 inch loft and he' fine. Check your front driveshaft too because when I was stock, my front driveshaft was destroyed and vibrated all the time
#3
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Year: 1996
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not trying to thread jack or anything but I also am having that "slap" issue that you are having. not all of the time but sometimes, usually after it warms up, leaving a stop light or stop sign it will make that slap sound and to me it almost seems like the transfer case chain is loose? i am not positive and would like to know for sure before i take the time to do that. my other thought was the rear end but it doesnt do it all the time so i was theoretically ruling that out. if anyone else has any info like this im sure we both would appreciate it.
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Year: 1996
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Its been a year and 15000 mile since the 2in lift now my jeep only vibs down the highway at 65. I have had the tires balanced and rotated it still dose it is there a sure fire way to check if the driveshaft is bad?
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You can take the drive shaft out and play with the u joints. If they're hard to swivel and if there's play in the caps, them you should replace them. When I say play in the caps, the joint should be tight inside the shaft and should just allow swivel movements.
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Originally Posted by DoWork25
not trying to thread jack or anything but I also am having that "slap" issue that you are having. not all of the time but sometimes, usually after it warms up, leaving a stop light or stop sign it will make that slap sound and to me it almost seems like the transfer case chain is loose? i am not positive and would like to know for sure before i take the time to do that. my other thought was the rear end but it doesnt do it all the time so i was theoretically ruling that out. if anyone else has any info like this im sure we both would appreciate it.
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#8
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For me it sounds like the rear end unloading (that sounds like a good description even though I am not sure what that means) It almost feels like a something is comming loose but i checked all bolts to see if they are tight. the local gear shop said they will rebuild my whole rearend for 650 bucks (with me pulling and reinstalling) the odd part is it gets worse when it heats up.
#9
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My stock Cherokee did that and I never found out what it was but I was fairly certain it was either my brakes letting go because my drums suck or it was the leaf and shackle bushings being seized . That's my .02$.
#10
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For me it sounds like the rear end unloading (that sounds like a good description even though I am not sure what that means) It almost feels like a something is comming loose but i checked all bolts to see if they are tight. the local gear shop said they will rebuild my whole rearend for 650 bucks (with me pulling and reinstalling) the odd part is it gets worse when it heats up.
I lubed mine up and it stopped doing it.
Now it's doing it again. Need to lube it again.
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Year: 1996
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Originally Posted by 77olds
The slip yoke likes to stick on these. It's the part of your drive shaft hidden in the rubber boot. When you take off, the slip yoke slides apart just a bit, and because it likes to stuck, you get that "thud" or "clunk" feeling, almost a feeling like there's a bowling ball in your cargo area that just rolled back and hit the lift gate or something.
I lubed mine up and it stopped doing it.
Now it's doing it again. Need to lube it again.
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Originally Posted by Btommy
For me it sounds like the rear end unloading (that sounds like a good description even though I am not sure what that means) It almost feels like a something is comming loose but i checked all bolts to see if they are tight. the local gear shop said they will rebuild my whole rearend for 650 bucks (with me pulling and reinstalling) the odd part is it gets worse when it heats up.
#13
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Originally Posted by Rere1992
Is it like a clunking or unloading feeling where the rear end drops ?
#14
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You have to unclamp that rubber boot. It has those annoying band clamps that lock together, they're kinda tricky to undo, and I had my XJ on a hoist when I did it.
Then you just slip it out of the way, stick your hand in a tub of axle grease and goop some on the slip yoke, making sure to get it in the splines really good.
Then you just reclamp the boot. And yes, you DO want to keep the boot, otherwise you can expect to be greasing it every couple of days, or constantly having to clean it if you drive anywhere where they're dirt.
Then you just slip it out of the way, stick your hand in a tub of axle grease and goop some on the slip yoke, making sure to get it in the splines really good.
Then you just reclamp the boot. And yes, you DO want to keep the boot, otherwise you can expect to be greasing it every couple of days, or constantly having to clean it if you drive anywhere where they're dirt.