biffidun Posted March 4, 2012 Share Posted March 4, 2012 Hi guys, here is my problem. I can drive all day as long as I don't stay in 4th (top gear) for more than say 5-10 minutes. If I stay cruising for too long then a rythmic banging starts to come from the transmission, which progressively gets louder and then the truck starts to hesitate with each bang. All I have to do to fix this (temporarily) is to come to a complete stop and start up again. As I get rolling through first gear there is a clunk and then all is well for another 5 minutes are so.I have checked and added gear oil to the transmission (not sure how much to put in though) and I have added gear oil to one of the diffs in the rear. I put some Lucas in the transmission thinking it was not getting proper lubrication up at the top on the 3rd 4th gear axle. No significant change, in fact I might say that the problem presents itself sooner with the Lucas in there.I removed the top plate of the transmission but could not see anything obviously wrong.Any thoughts? Quote Link to comment https://www.bigmacktrucks.com/topic/23618-dm685-with-maxitorque-4pluslo-speed-banging/ Share on other sites More sharing options...
Rob Posted March 4, 2012 Share Posted March 4, 2012 Hi guys, here is my problem. I can drive all day as long as I don't stay in 4th (top gear) for more than say 5-10 minutes. If I stay cruising for too long then a rythmic banging starts to come from the transmission, which progressively gets louder and then the truck starts to hesitate with each bang. All I have to do to fix this (temporarily) is to come to a complete stop and start up again. As I get rolling through first gear there is a clunk and then all is well for another 5 minutes are so.I have checked and added gear oil to the transmission (not sure how much to put in though) and I have added gear oil to one of the diffs in the rear. I put some Lucas in the transmission thinking it was not getting proper lubrication up at the top on the 3rd 4th gear axle. No significant change, in fact I might say that the problem presents itself sooner with the Lucas in there.I removed the top plate of the transmission but could not see anything obviously wrong.Any thoughts?There are magnets in the side, and bottom of the transmission; these should be checked for "chunks". Also I would pull the side magnet in the front drive axle as you could have a cam and peanut issue developing.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/23618-dm685-with-maxitorque-4pluslo-speed-banging/#findComment-105571 Share on other sites More sharing options...
biffidun Posted March 4, 2012 Author Share Posted March 4, 2012 Thanks Rob. I checked the magnets on the tranny and other than a fine metal sludge nothing big. The drive axle may just be it. I've never touched wedges before, is this a scary thing or not too bad? I know they should be replaced as a set, but is there anything I should know? I do not have air lockers in the back fwiw. Quote Link to comment https://www.bigmacktrucks.com/topic/23618-dm685-with-maxitorque-4pluslo-speed-banging/#findComment-105595 Share on other sites More sharing options...
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