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 Re: 81 Jeep drive train troubles
[Re: BobRowe]
#878704
04/10/08 05:41 AM
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Joined: Sep 2005
Posts: 692
Rock Warrior
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Good point, my Ford does have locking hubs, so when its in 2WD the only things spinning in the front are the wheels. If his jeep didn't have locking hubs, the front axle would spin all the time, and he should notice it in 2WD too, unless it just wasn't loud enough to be heard......
99 XJ Sport 2 Door, 4.0L, 5 speed, all stock. Daily Driver
79 F150 Standard Cab Short Box, 400ci, NP435, NP205, 35" SSRs
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Re: 81 Jeep drive train troubles
[Re: Bigbird79]
#878705
04/10/08 06:04 PM
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Joined: Feb 2008
Posts: 23
OP
Need a Spot
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I took the locking hubs off years ago. It is a woods jeep, it NEVER comes out of 4wd. I haven't driven the jeep consistently in over 3 or 4 yrs. b/c of this problem and work and athletics.....you get the picture. I'm wanting to get it going again as I love driving that old jeep. I guess why I never checked the ratios is that you just never think that would be the problem. At least I didn't. I will check the ratios next time I'm at my camp and will post back what I find. No the jeep does not do it only when it turns Big Jim. Like I told you, I know a thing or 2 about 4wd and what they are supposed to do, and not supposed to do. If you read the last post I made you would see it even did it in the grass. It also NEVER did this before the repairs, so why now is it all of a sudden "gaining traction". I understand you reread my posts, now let's start trying to comprehend what you've read twice. <img src="/forums/images/graemlins/ignore.gif" alt="" /> Duece
"When you're dumb...you've gotta be tough!"
81' Jeep CJ5 31x15.50 Ditch Witch Tractor tires 8500lb winch dog box; 92' Toyota p/u 3.0 v-6 auto tranny, 31x12.5 Super Swamper Bogger's, JVC CD player 8" Bazooka Bass tube, Clarion mids and highs.
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 Re: 81 Jeep drive train troubles
[Re: duece]
#878706
04/10/08 06:53 PM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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Sorry duece, but you don't know what you THINK you know!!! You write that it NEVER comes out of four wheel drive! If TRUE your problem is as I have described over and over for your benefit!!! If the gears are different it WILL start jumping in about 12 feet! AND it will never stop.. Trust me on this I have had one brought to me with one gear difference and it was never going to work for even ONE MINUTE.. If you have a front locker it will make the jumping even worse. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: 81 Jeep drive train troubles
[Re: BigJim]
#878707
04/14/08 12:58 AM
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Joined: Feb 2008
Posts: 23
OP
Need a Spot
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Alrighty then! I measured the tires this weekend and...they are all the same! That solves that problem. So, Big Jim you being the expert...what is my problem then? If it doesn't keep doing it, what's going on then? The physics of what you're saying makes sense on surfaces that have little to no "give". Where I ran it last weekend was in a slough, very boggy and sloppy conditions. This would lead me to beleive that it wouldn't do it b/c of the ability to slip, but then again, what do I know? The other thing is that you can drive it around for a while and sometimes it never does this. When it does do it, it is not always on the hard-packed road. I've had it do it to me in sand, mud and water, grass etc. What's funny is it never actually binds up. When it does it my natural instinct is to stop b/c of the fact it sounds like someone is banging on the bottom of the jeep w/an 8 lb. sledge hammer! You can let out on the clutch and away she rolls again! Sometimes she'll go 30 feet and do it again, other times it never does it in 3 hours of riding!!!! I'm at a loss b/c as I said it is not just "gaining traction". I've driven this jeep in the same conditions since 1986, so unless the traction fairy <img src="/forums/images/graemlins/nana.gif" alt="" /> has come along and spread traction dust, something's gotta be broken or setup wrong. <img src="/forums/images/graemlins/confused.gif" alt="" /> Duece
"When you're dumb...you've gotta be tough!"
81' Jeep CJ5 31x15.50 Ditch Witch Tractor tires 8500lb winch dog box; 92' Toyota p/u 3.0 v-6 auto tranny, 31x12.5 Super Swamper Bogger's, JVC CD player 8" Bazooka Bass tube, Clarion mids and highs.
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Re: 81 Jeep drive train troubles
[Re: duece]
#878708
04/14/08 03:34 AM
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Joined: Oct 2003
Posts: 7,768
Web Wheeler
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Alrighty then! I measured the tires this weekend and...they are all the same! That solves that problem. So, Big Jim you being the expert...what is my problem then? If it doesn't keep doing it, what's going on then? The physics of what you're saying makes sense on surfaces that have little to no "give". Where I ran it last weekend was in a slough, very boggy and sloppy conditions. This would lead me to beleive that it wouldn't do it b/c of the ability to slip, but then again, what do I know? The other thing is that you can drive it around for a while and sometimes it never does this. When it does do it, it is not always on the hard-packed road. I've had it do it to me in sand, mud and water, grass etc. What's funny is it never actually binds up. When it does it my natural instinct is to stop b/c of the fact it sounds like someone is banging on the bottom of the jeep w/an 8 lb. sledge hammer! You can let out on the clutch and away she rolls again! Sometimes she'll go 30 feet and do it again, other times it never does it in 3 hours of riding!!!! I'm at a loss b/c as I said it is not just "gaining traction". I've driven this jeep in the same conditions since 1986, so unless the traction fairy <img src="/forums/images/graemlins/nana.gif" alt="" /> has come along and spread traction dust, something's gotta be broken or setup wrong. <img src="/forums/images/graemlins/confused.gif" alt="" /> Duece Duece...See posts above. Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
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Re: 81 Jeep drive train troubles
[Re: duece]
#878709
04/14/08 07:29 AM
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Joined: Sep 2005
Posts: 1,087
Body Damage is Cool
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Duece, let's re-group on this problem a little bit.
First, can I assume that you have open differentials in both axles? If not, what type of traction aiding devices do you have in each axle? Some lockers and LSDs will give the sumptoms that you describe when they start going bad.
Second, what kind of transfer case do you have? Does it have a chain drive in it? If so, how long has it been since you had it apart and looked at the chain and sprokets?
Third, do you have a CV (double-cardan) joint on either of your driveshafts? Sometimes they can make a popping sound when they start going bad.
1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
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Re: 81 Jeep drive train troubles
[Re: BobRowe]
#878710
04/14/08 11:03 AM
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Joined: Feb 2007
Posts: 131
Wheeler
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i seem to remember my xj's 8.25 doing something similar once just before the carrier broke in 2 & the passenger side axle shaft launched out of the tube. popping & a shimmy at speed. but you dont get up to speed in this jeep. turns out that one of the c-clips broke & that ruined everything back there. just a thought. at any rate i did that on a budget & i did not change out the pinion gear & it would sound like a machine gun going down the road & it would make a ton of noise in 4wd. all that was wrong with it was a couple of little nicks in it.
what axles are you running?
93 xj stroked 4.2 w/4.0 head avenger supercharged 6.5" long arm 35" buckshots rubicon 44's front & rear
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Re: 81 Jeep drive train troubles
[Re: el_d_m]
#878711
04/14/08 12:50 PM
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Joined: Feb 2008
Posts: 23
OP
Need a Spot
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Duece, let's re-group on this problem a little bit.
First, can I assume that you have open differentials in both axles? If not, what type of traction aiding devices do you have in each axle? Some lockers and LSDs will give the sumptoms that you describe when they start going bad.
Second, what kind of transfer case do you have? Does it have a chain drive in it? If so, how long has it been since you had it apart and looked at the chain and sprokets?
Third, do you have a CV (double-cardan) joint on either of your driveshafts? Sometimes they can make a popping sound when they start going bad. Yes, no traction aiding devices. I'm not sure on the t-case, but it was rebuilt 6 mos. ago b/c we thought that was the problem. Even though everything looked ok, we still rebuit it. No on the cv joints also. The transmission was rebuilt about a year ago b/c we thougth it might be the problem, and there was some wear in the gears. We also found some metal shavings in the oil, which is not uncommon, but we figured that HAD to be the culprit so we rebuilt it. Big Jim, what am I missing here? Have I not checked all you stated in your posts? Tell me what I'm missing b/c I think I've exhausted what resoureces you've been able to give me. Oh, and to add it is not a "popping" sound, it is more like banging. I'm serious, it literally sounds like someone beating on the drivetrain with a sledgehammer when it happens. Duece
Last edited by duece; 04/14/08 12:51 PM.
"When you're dumb...you've gotta be tough!"
81' Jeep CJ5 31x15.50 Ditch Witch Tractor tires 8500lb winch dog box; 92' Toyota p/u 3.0 v-6 auto tranny, 31x12.5 Super Swamper Bogger's, JVC CD player 8" Bazooka Bass tube, Clarion mids and highs.
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Re: 81 Jeep drive train troubles
[Re: duece]
#878712
04/14/08 04:28 PM
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Joined: Sep 2005
Posts: 1,087
Body Damage is Cool
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Strange...
Well, the argument could be made that it is something from the transfer case forward, since it only does it in 4WD. However, You're likely in 4WD when you're really stressing the vehicle.
I'd suggest that you take it off-road, and leave it in 2WD for a little while, and see if the noise occurs. If it does, that points to the rear half of the powertrain. If it doesn't, that points to the front half.
Your description sounds like either a worn u-joint or a badly worn gear. Can I assume that you have replaced the driveshafts' u-joints, as well as the u-joints in the front half-shafts?
It also could be a piece of metal in one of your differentials that every once in a while gets picked up in the gear oil and carried up to a meshing ring and pinion or spider gear. I realize that you've had the axles worked on, but it might be worth your while taking off the covers of your differentials and see if anything drops out with the gear lube. Then I'd douche the inside down really good with some type of spray solvent (carb cleaner or brake cleaner) before putting the covers back on and filling them.
Granted, these are long-shot suggestions, but you're done just about all the things one would think of first.
1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.
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Re: 81 Jeep drive train troubles
[Re: duece]
#878713
04/14/08 05:02 PM
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Joined: Sep 2005
Posts: 692
Rock Warrior
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The only other thing I can think of from my experience (other than a bad u joint) is maybe a bad trans/ transfer case mount. On my Ford, again, I had a worn out tranny / transfer case mount, and the transfer case would torque around under load, and bang against the floorboard. By chance is there any play in the slip joint in your drive shafts?
Too bad you don't have a spare jeep sitting around so you could swap parts until you identify the problem.
Sean
99 XJ Sport 2 Door, 4.0L, 5 speed, all stock. Daily Driver
79 F150 Standard Cab Short Box, 400ci, NP435, NP205, 35" SSRs
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