300tdi rear diff

[jx2mad]

How much "free play" is there in a rear diff. Mine makes a loud clunk when starting off. Also I am getting a series of clunks when slowing to a stop without load on the transmission. Any suggestions? Jim

[steveG]

You sure its the diff making the noise?
Takeoff clunks can be caused by quite a few other things like suspension bushes, loose bolts etc.

Series of clunks when slowing could be driveshaft universals if you haven't already checked them.

Steve

[Superhux]

I found alot of information in regards to splines being worn... Later models had oil injection holes drilled into the shaft to allow oil to lubricate...

[BilboBoggles]

The series of clunks when slowing to a halt sounds more like a handbrake being adjusted too tight. Might even be the cause of the huge clunk on takeoff if the shoes are a bit sticky.

[roverrescue]

Few options possible...
1/ Prop shaft unis - possible maybe

2/ More probable:
I think superhux is referring to the all to common input gear of the transfer case.
It is a usual suspect for your symptoms in many a 300tdi.
What year model is your vehicle?

To check the input gear, remove PTO cover of transfer case, slide off input gear and inspect.
If worn a new cross drilled input gear will get you out of trouble for a while as it will engage on up till now unused main shaft splines.

Do a search on LT230 input gear.

3/ The other place where flogged splines will cause cunking is at the wheel drive flanges. In grease lubricated wheel bearing models, the splines can dry out and fret.
To check for these, flick the rubber end caps off your axles and look for wear.
If worn, flanges and half shafts will need replacing and then either run oil lube wheel bearings or keep the grease up to the splines.

Generally speaking the rear diff in a 300tdi (Salsbury) is pretty robust.

Steve

[nice1guv]

Also check the oil quality and level in the diffs.

[cewilson]

Check the 'a-frame' ball joint - located on top of the rear diff.

Transmission handbrake might be causing it - especially concerning coasting in to a stop.

Or it could actually be the start of a hub bearing giving way.