edwardbahaw Posted May 21, 2011 Share Posted May 21, 2011 Hi all I have a question about the zf4hp22 transmission on my 300tdi discovery. It works fine except that the torque converter seems to lock up too soon. I know it is supposed to lock at 50mph however mines seem to do so at 47mph. What can be responsible for this and what can I do to address it? Thanks in advance! Quote Link to comment Share on other sites More sharing options...
karlo Posted May 21, 2011 Share Posted May 21, 2011 mine does it on 265's with a defender T box fitted. Quote Link to comment Share on other sites More sharing options...
Escape Posted May 23, 2011 Share Posted May 23, 2011 Hi all I have a question about the zf4hp22 transmission on my 300tdi discovery. It works fine except that the torque converter seems to lock up too soon. I know it is supposed to lock at 50mph however mines seem to do so at 47mph. What can be responsible for this and what can I do to address it? Thanks in advance! In the Range Rovers, lock-up is variable, depending on temperature etc. The difference between 47 and the official number of 50 seems too small to really represent a problem. I don't think it would effect your driving either (in fact, I wished mine would lock up sooner rather then later!), and if it should, just put down your foot a bit harder to keep it from locking. Quote Link to comment Share on other sites More sharing options...
auf_wiedersehen_pet Posted May 23, 2011 Share Posted May 23, 2011 I'm running 315/70/17s and it still locks up at an indicated 54mph - just as it did on 265/70/17s and 235/70/16s. The trouble is that the indicated 54mph is actually about 62mph - checked with a Road Angel, TomTom and an iPhone. Which is the next step? Diffs or a transfer box? Any 1st hand solutions out there? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted May 23, 2011 Share Posted May 23, 2011 AWP, try loosening your kickdown cable a touch, could be that it's not locking up due to this. Quote Link to comment Share on other sites More sharing options...
auf_wiedersehen_pet Posted May 23, 2011 Share Posted May 23, 2011 Thanks for the tip Bowie69. As I know absolutely nothing about gear boxes and the Disco is in for a hub seal next week I'll get my mechanic to do it. Quote Link to comment Share on other sites More sharing options...
auf_wiedersehen_pet Posted May 24, 2011 Share Posted May 24, 2011 Thanks for the tip Bowie69. As I know absolutely nothing about gear boxes and the Disco is in for a hub seal next week I'll get my mechanic to do it. Quote Link to comment Share on other sites More sharing options...
rdw Posted May 24, 2011 Share Posted May 24, 2011 Apologies for hijacking your thread - this is an interesting tip, would the same work on a Disco 11 TD5 to induce an earlier lock-up? rdw Quote Link to comment Share on other sites More sharing options...
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