GaruMJ Posted November 17, 2008 Share Posted November 17, 2008 First sorry about my English :oops: I have a problem with my MJ, when I engage the 4x4 I can hear a strange sound coming from under the front of the car it only does in 4HI or 4LOW when the car is on movement and it gets louder when I do a U-turn the differential has a vacuum actuated diaphragm. It is suppose to have 4.56 gear in it.(front and rear) with 31´s Thanks! I hope you can understand me!!! :D Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted November 17, 2008 Share Posted November 17, 2008 Understood 100%. But can you explain the sound? Maybe make a recording of it? With out hearing, my first thought was that your CAD was not completely engaging. But unsure without further explinations. CW Link to comment Share on other sites More sharing options...
BLHTAZ Posted November 17, 2008 Share Posted November 17, 2008 You are not trying to run it in 4WD on the road are you? The 4WD is only to be used off road on loose or slippery surfaces. If used on the raod, it will not make funny noises for long as it will break and stop moving ;) . Link to comment Share on other sites More sharing options...
GaruMJ Posted November 17, 2008 Author Share Posted November 17, 2008 You are not trying to run it in 4WD on the road are you? The 4WD is only to be used off road on loose or slippery surfaces. If used on the raod, it will not make funny noises for long as it will break and stop moving ;) . THANKS! but no I was at some dunes when I realize the problem, and yes it sound like something sliping, what you mean with CAD, the vacuum actuated thing on the differential? Thanks again!!!!!!!! :help: Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted November 17, 2008 Share Posted November 17, 2008 Yes, Central Axle Disconnect. You have a two piese axle shaft on the pass side. Each end is splined and a splined collar rides between them. Whne the T-case is sfifted into 4WD, vacuume is sent to the diapram in the CAD and the collor bwegins to move to connect the two sides of the shaft. What I 'm suggestion is that your collar is not fully engaging the splines of the other axle. Causing the noise when the "teeth" or splines try to engage. There are a couple options for you. Rebuild your CAD. Replace your CAD. Install washers to hold the axles engaged all the time. Install a cable lever to manually shift into 4WD. Try the search in this forum, there are many many countlesss threads outlining all options. CW Link to comment Share on other sites More sharing options...
Pete M Posted November 17, 2008 Share Posted November 17, 2008 Are the U-joints in the front driveshaft in good shape? And about the axlegear ratios, what engine and transmission do you have? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 17, 2008 Author Share Posted November 17, 2008 Yes, Central Axle Disconnect. You have a two piese axle shaft on the pass side. Each end is splined and a splined collar rides between them. Whne the T-case is sfifted into 4WD, vacuume is sent to the diapram in the CAD and the collor bwegins to move to connect the two sides of the shaft. What I 'm suggestion is that your collar is not fully engaging the splines of the other axle. Causing the noise when the "teeth" or splines try to engage. There are a couple options for you. Rebuild your CAD. Replace your CAD. Install washers to hold the axles engaged all the time. Install a cable lever to manually shift into 4WD. Try the search in this forum, there are many many countlesss threads outlining all options. CW THANKS CW! There is no problem if I install the washers?, I drive it on both sand and road. Are the U-joints in the front driveshaft in good shape? And about the axlegear ratios, what engine and transmission do you have? I have the stock engine and transmission(automatic), the engine just with the 2001 intake maniful and no fan clutch. There is a problem running that gears? Link to comment Share on other sites More sharing options...
Pete M Posted November 18, 2008 Share Posted November 18, 2008 4 cylinder engine or 6 cylinder engine? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 18, 2008 Author Share Posted November 18, 2008 4 cylinder engine or 6 cylinder engine? 4.0l 6 cilinder :yes: Link to comment Share on other sites More sharing options...
GaruMJ Posted November 22, 2008 Author Share Posted November 22, 2008 I just checked the CAD and it is OK, I aplied vacuum and doesn´t loose, I checked the diff fluid level and it´s OK, what else could be the problem? : :???: :help: Link to comment Share on other sites More sharing options...
maddzz1 Posted November 22, 2008 Share Posted November 22, 2008 Unless someone changed the gears it would have 3.55, not 4.56. I think thats why pete was asking. Putting the washers in won't affect it even if you drive it on the road. Using the washers only locks the axle together, it doesnt lock it in 4WD. Link to comment Share on other sites More sharing options...
GaruMJ Posted November 22, 2008 Author Share Posted November 22, 2008 Unless someone changed the gears it would have 3.55, not 4.56. I think thats why pete was asking. Putting the washers in won't affect it even if you drive it on the road. Using the washers only locks the axle together, it doesnt lock it in 4WD. yes,the guy that sell me the truck told me that he had changed to 4.56 but I am not sure if he did it in front too. But about the CAD it seems to be working fine to me acording to the test that I did. Link to comment Share on other sites More sharing options...
Sugarfoot Posted November 23, 2008 Share Posted November 23, 2008 You need to find out what gears are in each axel and they need to be the same or very close in numbers. Example 411 rear and 410 front. You did not answer Pete's question about the U-joints on the front axel though?. This will make a clanking or ticking sound when under way. What does your problem sound like? Is it constant? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 23, 2008 Author Share Posted November 23, 2008 You need to find out what gears are in each axel and they need to be the same or very close in numbers. Example 411 rear and 410 front. You did not answer Pete's question about the U-joints on the front axel though?. This will make a clanking or ticking sound when under way. What does your problem sound like? Is it constant? Yes, it is constant just on 4x4 an dit gets louder when I do a U turn, how I know what gear I´m running on front? Link to comment Share on other sites More sharing options...
Redramman Posted November 23, 2008 Share Posted November 23, 2008 If the person that owned your MJ before you did change front and rear axle gears did they do the work properly setting up gears can be tricky.Also did they add a front limmited slip differential,or posi-track,or some type of locking differential? Since u-turn effects the nois, I'm thinking possibly differential side gears or axle U-joints. You could put truck up on jack stands to check front axle spin a front tire by hand and see if other side spins the oposite way. Link to comment Share on other sites More sharing options...
GaruMJ Posted November 24, 2008 Author Share Posted November 24, 2008 Today I put the truckon jack stands, I selected 4 HI and 4LOW and the U-joint are OK, but the sound is coming out of the transfer case, with the 4 tires on the air and the front straight it doesn´t do the sound, but when I turn the tires wathever left or right it does and if I accelerate it sound worse, what could it be now, what I need to check????????? Link to comment Share on other sites More sharing options...
Pete M Posted November 24, 2008 Share Posted November 24, 2008 Axle shaft U-joints? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 24, 2008 Author Share Posted November 24, 2008 Axle shaft U-joints? Nop! they are OK, the sound is coming out of the trasfer case. Link to comment Share on other sites More sharing options...
Redramman Posted November 24, 2008 Share Posted November 24, 2008 Check oil in transfer case (Trans oil too while your there).Is front drive shaft on fixed yoke at T-case so you could remove it and re-run test on jack stands. Also with engine off trans in neutral you could spin front axle pinion or drive shaft to check for binding turn wheels re-check. Some T-case have a big wide (timming style) chain inside this chain could be worn and rubbing on case maybe :dunno: Link to comment Share on other sites More sharing options...
Redramman Posted November 24, 2008 Share Posted November 24, 2008 I'm looking at the book and all 5 transfer cases shown have a chain in them,not sure if thats the problem just a thought.What transmission and transfer case do you have? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 24, 2008 Author Share Posted November 24, 2008 Check oil in transfer case (Trans oil too while your there).Is front drive shaft on fixed yoke at T-case so you could remove it and re-run test on jack stands. Also with engine off trans in neutral you could spin front axle pinion or drive shaft to check for binding turn wheels re-check. Some T-case have a big wide (timming style) chain inside this chain could be worn and rubbing on case maybe :dunno: maybe it could be tha chain, because the transfer start to vibrate when I increase the speed on jack stands and the sound is worse. what else should I check??????????????????????????? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 24, 2008 Author Share Posted November 24, 2008 I'm looking at the book and all 5 transfer cases shown have a chain in them,not sure if thats the problem just a thought.What transmission and transfer case do you have? I´m not sure but the trans is the original of the mj ´90 and the transfer has just 4HI and 4LOW I think is the 231.....maybe........ how I know if the problem is the chain????????????? Link to comment Share on other sites More sharing options...
Redramman Posted November 24, 2008 Share Posted November 24, 2008 What size tires does it have? when you turn are they rubbing on suspension 4-link control arms? Also with engine off trans in neutral and transfer case in neutral spin front drive shaft by hand and check for sounds, I suppose you could run engine with transfer case in neutral to see if sound changes. Because turning steering effects sound, makes me think front axle pinion is harder to turn with wheels turned,that seems to hint at an axle u-joint or differential binding or stiff. :dunno: Sounds like a transfer case problem too. Link to comment Share on other sites More sharing options...
Redramman Posted November 24, 2008 Share Posted November 24, 2008 Have you tried running it without front drive shaft it looks like they all have a fixed yoke on front so you can remove front drive shaft whithout it leaking oil all over. Did it have oil in it? Link to comment Share on other sites More sharing options...
GaruMJ Posted November 24, 2008 Author Share Posted November 24, 2008 What size tires does it have? when you turn are they rubbing on suspension 4-link control arms? Also with engine off trans in neutral and transfer case in neutral spin front drive shaft by hand and check for sounds, I suppose you could run engine with transfer case in neutral to see if sound changes. Because turning steering effects sound, makes me think front axle pinion is harder to turn with wheels turned,that seems to hint at an axle u-joint or differential binding or stiff. :dunno: Sounds like a transfer case problem too. They are 31¨ and no, no rubbing, I agree is the transfer case but what could be the problem in it? how can I change or check the chain??? Link to comment Share on other sites More sharing options...
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