dirtlord420 Posted November 7, 2011 Share Posted November 7, 2011 ok this is on my 88 comanche 4.0 auto long wheel base 2x4. i thought my driveshaft was out of balance. i took it to the shop. they said it was in balance, but its slipping on the inside the rubber part i guess. they said they could make a new one for 250 - 300 bucks. my question is would this cause my truck to vibrate really bad at 55 mph? i need my truck fixed and i don't have alot of money to do it. Link to comment Share on other sites More sharing options...
Pete M Posted November 7, 2011 Share Posted November 7, 2011 that would be the first time I've ever heard of a 2-piece driveshaft coming apart at the rubber isolator. :dunno: not saying it isn't possible, but that does sound shady. 55mph is a common speed for tire imbalances to show themselves. Link to comment Share on other sites More sharing options...
dirtlord420 Posted November 7, 2011 Author Share Posted November 7, 2011 its a one piece. its about 62in long. i was thinking the same thing does sound pretty shady. ill lookin in to my tires. also the transmission mount was broke. not the rubber but the metal. the back two studs were completly gone. i fixed that it helped a little. Link to comment Share on other sites More sharing options...
Pete M Posted November 7, 2011 Share Posted November 7, 2011 if it has a rubber isolator, I generally refer to it as a 2-piece (2 parts separated by the rubber), but it's not that kind of 2-piece. :D Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted November 7, 2011 Share Posted November 7, 2011 Transmission output shaft bushing? If its worn it'll cause the driveshaft to wobble [like mine at 55+]. Link to comment Share on other sites More sharing options...
carnuck Posted November 8, 2011 Share Posted November 8, 2011 Is it lifted? That can cause vibes too. Mine has the rubber insert too probably. Shops won't cut those down because the rubber heats up and EXPLODES the 2 pieces apart while welding (I saw 1 bust through a shop wall back when I did driveshafts. Wasn't in my lathe, thank goodness!) Link to comment Share on other sites More sharing options...
Pete M Posted November 8, 2011 Share Posted November 8, 2011 I had my rubber-isolator driveshaft cut down no problemo. :thumbsup: Link to comment Share on other sites More sharing options...
dirtlord420 Posted November 8, 2011 Author Share Posted November 8, 2011 no its not lifted. I'm picking it up today. I'm going to ask them how they came to the decision that i need a new one, and how they tested it. going to check the tires and the sleeve in the trans. what am i looking for when i check the sleeve? i just remember when my uncle owned the jeep it had a bent driveshaft in it. also the tank is all smashed in. Link to comment Share on other sites More sharing options...
Dadinator Posted November 8, 2011 Share Posted November 8, 2011 I thought mine was out of balance too as I modified it when I changed from auto to 5sp. It turned out to be wheels out of balance. Make sure that your wheels/tires are balanced 1st. Good Luck. Link to comment Share on other sites More sharing options...
tbrand Posted November 9, 2011 Share Posted November 9, 2011 This may be a silly question, but how are your u-joints? Mine both went bad in the space of two months, and gave me all kinds of odd noises and vibrations. Link to comment Share on other sites More sharing options...
dirtlord420 Posted November 9, 2011 Author Share Posted November 9, 2011 u-joints are pretty good. the part at the end of the drive shaft that hold the u-joint in is a little lose. why they said they wanted to build another one. so there is nothing wrong with the driveshaft. ill check the tires next Link to comment Share on other sites More sharing options...
Jeep Driver Posted November 9, 2011 Share Posted November 9, 2011 ok this is on my 88 comanche 4.0 auto long wheel base 2x4. i thought my driveshaft was out of balance. i took it to the shop. they said it was in balance, but its slipping on the inside the rubber part i guess. they said they could make a new one for 250 - 300 bucks. my question is would this cause my truck to vibrate really bad at 55 mph? i need my truck fixed and i don't have alot of money to do it. That DS is a POS.......get a new one made and never look back. Link to comment Share on other sites More sharing options...
mvusse Posted November 10, 2011 Share Posted November 10, 2011 It could even be a consistently missing cylinder due to bad spark plug or plug wire. Or play in the rear axle pinion. But I agree with checking tire balance first. Link to comment Share on other sites More sharing options...
dirtlord420 Posted November 10, 2011 Author Share Posted November 10, 2011 if the driveshaft get any worse. me and my grandpa are going to heat it up and cool it down real fast casusing the metal to shrink. i'll check the wires. it does feel like its running rough Link to comment Share on other sites More sharing options...
Jeep Driver Posted November 10, 2011 Share Posted November 10, 2011 if the driveshaft get any worse. me and my grandpa are going to heat it up and cool it down real fast casusing the metal to shrink. i'll check the wires. it does feel like its running rough Not a good idea! Link to comment Share on other sites More sharing options...
carnuck Posted November 11, 2011 Share Posted November 11, 2011 Got mine out finally. Got a zip for shipping cost est? Link to comment Share on other sites More sharing options...
Jeep Driver Posted November 11, 2011 Share Posted November 11, 2011 u-joints are pretty good. the part at the end of the drive shaft that hold the u-joint in is a little lose. why they said they wanted to build another one. so there is nothing wrong with the driveshaft. ill check the tires next Your DS is bad. The rubber the WAS compressed between the two tubes is now hard and has shrunk in size and is no longer keeping the two tubes centered, this is why it is out of balance. Eventually the two tubes will spin out from each other. Heating it will only destroy what is left of the rubber. The steel will not shrink around the rubber when heated and cooled. Heat expands metal. The only thing you will do is melt the rubber and destroy the tinsel strength of the steel by cooling it too rapidly as you stated. Mine was in the same condition and I had a new one built for a different reason but I had no idea how bad it was until I got the new one installed. You ignored my comment and went on to talk about heating and cooling.............to each his own........but big mistake. Link to comment Share on other sites More sharing options...
dirtlord420 Posted November 11, 2011 Author Share Posted November 11, 2011 ^^^ the driveshaft shop said it wasnt out of balance. and i havent done anything to it. Link to comment Share on other sites More sharing options...
Jeep Driver Posted November 11, 2011 Share Posted November 11, 2011 ^^^ the driveshaft shop said it wasnt out of balance. and i havent done anything to it. That contradicts your previous comment about it being loose. Link to comment Share on other sites More sharing options...
mule13 Posted November 12, 2011 Share Posted November 12, 2011 When i switched my YJ over to new axles they didnt come with locking hubs so the front end was always turning. driving the front ds back thru the transfer.the new front axle was a 44 so it was a little longer in the yoke. i just took the ds out and uct about an inch off of it at the splines. this loosened the blue plastic that is there so i just pulled it off. it worked great until i drove it on the road.where it vibrated really bad.once we figured out what was happening i had a new one made and it drove smooth as could be after that. Link to comment Share on other sites More sharing options...
carnuck Posted November 23, 2011 Share Posted November 23, 2011 Sorry. Been crazy the past few weeks. (in more ways than 1. I may be looking at the big D) Link to comment Share on other sites More sharing options...
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