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 thumping when accelerating
#845245
11/04/07 03:37 PM
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Joined: Jan 2007
Posts: 353
OP
Mudrunner
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wow i havnt been on this site in a while, been at school for about 11 hours a day, well my problem is i get a thumping from under the jeep when i accelerate hard, i was told it could be the transmisson mount or the transfer case shifter linkage, how would i go about checking both of these?
WHEN THE ROAD ENDS, THE FUN BEGINS
97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
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Re: thumping when accelerating
[Re: playinmud]
#845246
11/04/07 05:37 PM
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Joined: Jan 2007
Posts: 534
Rock Warrior
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I don't see how the t-case linkage could cause this. The first thing I'd be looking at is the rear drivshaft. See if there is any play back and forth in it. Worn U joint or possibly alignment bearing if it's a CV shaft. U joint would be my first suspect.
97tj, Shaved Ford 9 rear, 4:10's, New 35x12.5 BFG KM2's to test!, Warn x8000i, ARB's, Quick Disco's, Hand Throttle, & it's my DD. 
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Re: thumping when accelerating
[Re: DBL_DTY97TJ]
#845247
11/04/07 07:00 PM
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Joined: Oct 2006
Posts: 2,079
Body Damage is Cool
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Check your transmission mount and the motor mounts. If you have any play in one of those, the enitre driveline could be torquing up into your floor pan.
Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges
What this country needs is unemployed politicians.
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 Re: thumping when accelerating
[Re: Brown81CJ5]
#845248
11/04/07 08:02 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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What Brown said.... Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: thumping when accelerating
[Re: BigJim]
#845249
11/05/07 02:04 AM
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Joined: Jan 2007
Posts: 353
OP
Mudrunner
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am i just looking to see if its chewed up? atleast thats what i was told to look for
WHEN THE ROAD ENDS, THE FUN BEGINS
97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
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Re: thumping when accelerating
[Re: playinmud]
#845250
11/05/07 03:34 AM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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We are telling you different.... Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: thumping when accelerating
[Re: BigJim]
#845251
11/05/07 04:05 AM
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Joined: Oct 2006
Posts: 2,079
Body Damage is Cool
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The factory rubber bushing mounts are prone to dry rot just like tires are. They won't be "chewed up", but look more like they are crumbling. If they look like that then they are not absorbing anything, just squishing out of the way. Might also want to check to see if it is just the bolts that are loose.
The prob occuring at acceleration, especially hard acceleration, leads me to believe that it couldn't be much else but the driveline mounts....tranny mount and motor mounts checked visually...you might need to lower your T-skid to check the tranny mount...not familiar with TJ's.
Gun it and run it!
1981 CJ5,258,T-176,D300,AMC 20,Dana 30,Trxus M/T 31x10.50, Rancho 5000's, GroundPounderFab front bumper, polyethylene gas tank, aluminum dash, AutoMeter gauges
What this country needs is unemployed politicians.
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Re: thumping when accelerating
[Re: Brown81CJ5]
#845252
11/05/07 10:57 PM
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Joined: Jan 2007
Posts: 353
OP
Mudrunner
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my bad i didnt comprehend the check for play part
WHEN THE ROAD ENDS, THE FUN BEGINS
97 sahara, 4in skyjacker lift, 33in tires, borla header & catback, 10in subs
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