[Rovernet] Lance's dead pumpkin

[Peter King]

Lance, this reply comes from the John Keane on the Federal Rovers Group on Facebook:


Maybe you have trapped a needle from the UJ when putting the left half shaft back together ( very easy to do ).
Unbolt the half shaft from the brake disk and with the wheel off the ground check the the shaft can be rotated without any UJ stiffness.
2nd hand Diffs are available through the main suppliers, but I wouldn't think that is the problem. The diffs look the same for the 2000 & 3500 but the ratios are different. The unit is specific to the P6 and not shared with other makes.



Sent from my iPhone

> On Mar 27, 2020, at 6:08 PM, LANCE LA CERTE PSY D via Rovernet <rovernet at rovernet.org> wrote:
> 
> 
> 
> Would really appreciate some diagnostic confirmation/correction/guidance followed by any advice regarding availability/re-buildability.
> 
> Car: '70 3500S.    I am now on my 2nd, what I suspect is, a dead 'pumpkin' (differential).  Recently developed a rear end thump, very noticeable when slowing, absent at high rpm's.    All universal joints replaced in past 500 miles, brake calipers rebuilt, disc brake bolts tightened and secured, top and bottom rear shock absorber nuts nice and tight, rebuilt DeDion in past 500 miles etc. etc.
> 
> When I put the car up on the lift and then the rear end up on jack stands there was no excessive play in any of part of the rear drive train.  With the gear box in neutral, I rotated each rear wheel and discovered the rear passenger wheel rotated freely, but the left rear would only rotate about 270 degrees before stopping.   With some force and I could get it to free up and then continue its 360 rotation.
> 
> With the rear still elevated, I turned on the engine, put it into first gear, and let it run freely.  I immediately noticed that on each rotation the whole left side of the differential would dip down as though it were again momentarily caught or binding.
> 
> 1) Does anyone know if there is a rebuild kit available, because when I replaced my original worn out unit with the current one, there was no assurance (except that it rotated freely) how many actual miles it had on it.     2) Barring an unobtainium rebuilt kit does anyone know of any low mileage units available?    3) Is this differential exclusive to the Rover V8 3500 model (not well enough versed to know if it is the same differential in the 2000/2200 series?) or are there other marques which used it (e.g., Jaguar????).
> 
> Any help would be appreciated.
> 
> Lance
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