opelman Posted August 13, 2012 Share Posted August 13, 2012 Hi, The symptoms are as follows - when lifting off the trottle down a hill there is what sounds and feels like a fair amount of backlash somewhere in the drive train. It is most noticeable when the rear wheels are driving the engine, so much so that I often dip the clutch to prevent the slack from going 'back and forth'. I have checked the propshaft joints but cannot find any slack. Does anone have any ideas please ? Quote Link to comment Share on other sites More sharing options...
mantadoc Posted August 13, 2012 Share Posted August 13, 2012 Check if back lash is in the diff then check torque tube is still attached to axle. Quote Link to comment Share on other sites More sharing options...
Kevin Abbott Posted August 13, 2012 Share Posted August 13, 2012 Do you have the spring in the end of the prop? Gearbox end Quote Link to comment Share on other sites More sharing options...
opelman Posted August 13, 2012 Author Share Posted August 13, 2012 Thanks Mantadoc will do, do the torque tubes break ? Yes Kevin I do, specifically remember fitting it. Quote Link to comment Share on other sites More sharing options...
spiney_norman Posted August 13, 2012 Share Posted August 13, 2012 Rubber donut with the bearing at the front of the torque tube is worth checking. Quote Link to comment Share on other sites More sharing options...
mantadoc Posted August 13, 2012 Share Posted August 13, 2012 Rubber donut with the bearing at the front of the torque tube is worth checking. If it was that you would not feel it unless you have a torque tube off an auto Quote Link to comment Share on other sites More sharing options...
cam.in.head Posted August 13, 2012 Share Posted August 13, 2012 If it was that you would not feel it unless you have a torque tube off an auto is a `torque tube off an auto differrent ? Quote Link to comment Share on other sites More sharing options...
mantadoc Posted August 13, 2012 Share Posted August 13, 2012 No they are the same.................. ...............but on the manual they have a big U bolt and lump of iron bolted to them so if the torque tube moved back and forward the block of iron will hit the crossmenber before it goes 1/2" On an auto there is no such thing as, I believe, they didn;t fit it because they are smoother in changes. The rubber bearing in the front might give you a bearing sound but shouldn't introduce backlash. I'd check the passenger side engine mount too. I used to tear loads of rubbers to pieces, that and the gearbox mount if the lever moved back and tooa lot between power and overrun but again that shouldn't give back lash just sloppy feel Quote Link to comment Share on other sites More sharing options...
399Road Posted August 19, 2012 Share Posted August 19, 2012 Is this car running really low suspension? Both my old GT/E and current Ascona had this noise. I think it's to do with the angle of the prop U.J's on lowered cars. I've modified the Ascona's torque tube crossmember to raise the front of the torque tube and straighten the prop up and this has reduced the noise considerably. I chopped up a couple of these crossmembers , saving the cage off the top of one and then chop the cage off the other one. Weld a section of 1" box section between the two and then box it all back in, seam welding as you go . You can get new bearings for inside the rubber mount from ALYMAC on here so you might as well fit one of these while it's in bits. A cheap modification that makes sense when you look at the angle of the prop and torque tube before and after. I also had to "relieve" the transmission tunnel above the torque tube slightly with a hammer to give a little more clearance after this modification, though you could probably just take a little material off the top rib of the torque tube's alloy casing to give the same effect. Luke. Quote Link to comment Share on other sites More sharing options...
opelman Posted August 22, 2012 Author Share Posted August 22, 2012 Thanks for all the replies. Luke - Yes the car is lowered and you're right there is now an angle between the torque tube and prop. Out of interest I'll put back some taller springs back in to see what difference it makes and take it from there. Quote Link to comment Share on other sites More sharing options...
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