 | Home > Technical > How much play in rear diff? |
 
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| Grenadier Member Since: 23 Jul 2014 Location: The foot of Mont Blanc... Posts: 5829   
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Hello all,
As per the title, how much play should there be, when rolling the vehicle backwards and forwards, wheels on the ground, handbrake on, and before the rear diff seems to ‘engage’ the crown attached to the prop shaft? Should it be tight, i.e. no play, semi-tight i.e. some play or can you rock a Def ‘noticeably’ backwards and forwards before engagement of the prop? I have a definite amount of ‘rock’ fore/aft before it stops and engages the crown on the diff and is stopped by the hand braked prop. Definitely NOT the axles which had new H/shafts and HD flanges put in six months ago. I can film this if it would make it clearer. Monsieur Le Grenadier I've not been everywhere, but it's on my list..... 2011 Puma 110DC - Corris Grey |
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22nd Mar 2022 1:50pm |
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| jfh Member Since: 08 Jan 2014 Location: West Coast Posts: 359  
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With your Landy on the ground you should be able to replicate this. Hope this helps. |
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22nd Mar 2022 3:04pm |
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| Grenadier Member Since: 23 Jul 2014 Location: The foot of Mont Blanc... Posts: 5829
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Thanks JFH. I’ll do his full test (once I’ve ordered the LR short plank of wood
 ), but looking at it, that seems to be how much play I have in the rear diff as well. Will keep you all posted, as you must be enthralled. Monsieur Le Grenadier
I've not been everywhere, but it's on my list..... 2011 Puma 110DC - Corris Grey |
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22nd Mar 2022 3:34pm |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 400  
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There's always a bit, but the difference between a vehicle with a nice drivetrain and a bad one is often the play at the axle end. I've never quite grasped why, but my test case was a Discovery that I used to own that developed a truly awful gearchange, crunchy and just nasty, exacerbated by the fact it was a V8. Months later I discovered that the gears in the front diff centre had worn into the cage creating excess play, and when a new diff was fitted, the gearchange was completely transformed. I concluded that the slack was causing a sort of 'bounce' through the drivetrain as it went from drive to overrun during the gearchange, and upsetting the syncromesh in the gearbox. My Puma gearchange is a bit disagreeable and I'm pretty sure it's down to the overall slack in the system which is 'normal but at the rubbish end of normal', I've observed similar things in many other vehicles and seen front and rear diffs that are slack or have some developing defect (gears wearing into cage, broken pins, rear 110 diffs with loose bolts) that all create the sense that something is wrong in the vehicle but it takes some work to pinpoint it. So if you think there's more play than there should be, it's worth chasing down as you may find other unexpected benefits, but it will never be absolutely tight.
Or you can buy a Salisbury which has about 3 turns of lash in the pinion as standard  ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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30th Mar 2022 8:38am |
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