WiscoXJ Posted May 19, 2015 Share Posted May 19, 2015 Just finished a whole HO swap. Everything came out of my running and driving Cherokee. now cruising down the road at about 40-50 mph you get a loud grinding noise. once you let off it goes away. the truck currently doesn't have any tcase linkage or a front shaft on it. I put the rear on stands and tried to simulate the noise. I got it to do it and put my hand on the tcase and that's wheres the vibration seemed to be coming from. I shifted the tcase to 4 hi and retested noise still happened around the same speed. I wouldn't think it would be coming from the trans but I also don't understand how a tcase can go bad like that. any ideas? rear end seems to clunk a lot. I don't know if it could be that? Link to comment Share on other sites More sharing options...
88whitemanche Posted May 19, 2015 Share Posted May 19, 2015 U-joints? Link to comment Share on other sites More sharing options...
WiscoXJ Posted May 19, 2015 Author Share Posted May 19, 2015 had a customer driveshaft made for it and new joints were put in it Link to comment Share on other sites More sharing options...
1987Comanche Posted May 20, 2015 Share Posted May 20, 2015 try putting a pencil magnet in the fill hole to see if you can fish out any metal. If you shift into neutral at speed does the noise/vibration go away? Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 20, 2015 Share Posted May 20, 2015 Try pulling the flex plate cover and look for scrape marks on the inner cover since you only get the noise under throttle. While it's off rotate the engine 360 and check for flex plate cracks and/or loose bolts. Link to comment Share on other sites More sharing options...
WiscoXJ Posted May 20, 2015 Author Share Posted May 20, 2015 Try pulling the flex plate cover and look for scrape marks on the inner cover since you only get the noise under throttle. While it's off rotate the engine 360 and check for flex plate cracks and/or loose bolts. I will check that try putting a pencil magnet in the fill hole to see if you can fish out any metal. If you shift into neutral at speed does the noise/vibration go away? once you let off the noise goes away, I was going to try the magnet thing though Link to comment Share on other sites More sharing options...
schardein Posted May 20, 2015 Share Posted May 20, 2015 Did you change axles too? I switched from a dana 35 to a Chrysler 8.25 (this is in my XJ) and picked up some rear end gear noise at about 45-55 mph. Annoying but doubt it is serious. Also, my XJ had a super annoying driveline hum and weird clunking noise. Turned out to be the transmission rubber mount. It looked fine, but was soaked with oil and super soft. The clunk was the whole transmission and transfer case bumping up and down whenever I hit a slight bump. New mount completely cured it. Link to comment Share on other sites More sharing options...
WiscoXJ Posted May 21, 2015 Author Share Posted May 21, 2015 my mount is shot.. its on my to do list.. its a different axle but still d35 Link to comment Share on other sites More sharing options...
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