WRLondon Posted June 5, 2020 Share Posted June 5, 2020 Car is a 110 TD5 2000 Fitted the gkn overdrive and reverse gear feels like a slipping clutch and won’t let it reverse thats without any of the wiring fitted to the solenoid or anything forward gears seems fine refitting the standard setup and reverse back to normal i know the design of the overdrive is that when the solenoid is operated it’s a one way gear or will smash the thrust bearing to pieces, but surely disengaged or not powered it should be ok? clutch plate is fine, has had a new sprag and seals am I missing something? thanks Quote Link to comment Share on other sites More sharing options...
reb78 Posted June 7, 2020 Share Posted June 7, 2020 Hard to make this one out. If it goes forward with the OD fitted, it should go backwards! Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted June 7, 2020 Share Posted June 7, 2020 I would just check out the number of teeth on the GKN gear matches what is on the original input gear https://www.lrworkshop.com/lt230-transfer-box/input-gear Quote Link to comment Share on other sites More sharing options...
ashtrans Posted June 18, 2020 Share Posted June 18, 2020 The problem is the clutch in the overdrive Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 18, 2020 Share Posted June 18, 2020 There's been more than one GKN Overdrive thread, full stripdowns, rebuilds, and explorations of the many ways it can go wrong - @western had mega-thread on his which I believe is still running; https://forums.lr4x4.com/search/?q=gkn overdrive&updated_after=any&page=2&sortby=relevancy&search_and_or=and Quote Link to comment Share on other sites More sharing options...
reb78 Posted June 19, 2020 Share Posted June 19, 2020 13 hours ago, ashtrans said: The problem is the clutch in the overdrive That wouldnt explain why it drives ok in forward gears? Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted June 19, 2020 Share Posted June 19, 2020 Sprag clutch? Quote Link to comment Share on other sites More sharing options...
ashtrans Posted June 20, 2020 Share Posted June 20, 2020 On 6/19/2020 at 12:36 PM, reb78 said: That wouldnt explain why it drives ok in forward gears? Sorry I can’t explain why, I am not that familiar with the internals but nevertheless it’s the overdrive that’s the problem Quote Link to comment Share on other sites More sharing options...
western Posted June 20, 2020 Share Posted June 20, 2020 this page is quite good, https://www.landypedia.de/index.php/Überholung_eines_GKN_Overdrives just right clickon the page & translate to english Quote Link to comment Share on other sites More sharing options...
reb78 Posted June 20, 2020 Share Posted June 20, 2020 On 6/19/2020 at 4:51 PM, vulcan bomber said: Sprag clutch? I have never quite understood what the sprag clutch does in there VB. Can you shed any light on it? We changed the one in Neils when his was slipping but it made no difference (that was after changing the clutch cone and that making no difference too!) Quote Link to comment Share on other sites More sharing options...
western Posted June 20, 2020 Share Posted June 20, 2020 The link above & the cross section diagram call it a one way roller clutch, so it should only work while going in forward drive, so it should have no effect when reverse is selected. Maybe someone has been inside the OD & refitted the sprag gear the wrong way up. Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted June 20, 2020 Share Posted June 20, 2020 2 hours ago, reb78 said: I have never quite understood what the sprag clutch does in there VB. Can you shed any light on it? We changed the one in Neils when his was slipping but it made no difference (that was after changing the clutch cone and that making no difference too!) I get the impression it is there for safety, so the overdrive can only be driven by the engine, not by the wheels. Quote Link to comment Share on other sites More sharing options...
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