transmision clunk

[land-def-90]

hi have yet another little prob on my 200tdi defender it started ages ago and has got gradually worse. if you put it in reverse and let the clutch out you hear a clunk..clunk noise the same happens when driving and taking your foot off the throttle. it sounds as if it from the transfer box but have been told it could be play in the diffs, there is about a 1/4 of a turn of play on both props. any ideas how to isolate prob before i start an expensive process of elimination, your comments would be apprecated....Iain

[Tinks]

I'd bet diff's before transfer box!
Just take of props and tighten / check torque of the pinion bolt.
Check the bearings etc.

If thats all alright then you've eliminated one problem and not spent a penny!!! :D  :D

[Jim-Willy]

Mine has a slight clunk from the tranny and the front diff but a wrecked u/j can cause the same noise, i had awful clunk until last week when the back u/j on the front prop was replaced, it was booogered, worth a check.....  If it is the diff or transfer box or both theres not a lot you can do really just live with it till it gets really bad then refurb / replace.......

[land-def-90]

thanks for that chaps all makes sense and will be investigated..... just one thing what is pinion bolt and how do i check / tighten it  thanks for your swift reply Iain

[extreme90]

a loose or worn rear a-frame ball joint can also cause a clunk, as can worn chassis-trailing arm mount bushes
also the front radius arm-axle bush's will cause a clunk when taking up drive and going onto over run and vice versa

but if you say it clunk's when going into reverese, id say its the backlash in the diffs and transfer box fue to ware and tare, and is nuffing to worry about  

just check them bush's tho and the rear a-frame ball joint

dan

[extreme90]

take the propshaft off,
in the center of the flange off the diff there will ( depends on diff ) be a bolt or a castle nut and split pin,

see if they are loose or you can tighten them up, altho i cant see it being that as you would be getting a oil weap/leak from the seal there as the pinion would be wobbling around (not much by couple of mm) but its enough to let oil past and to ware the seal out

dan

[land-def-90]

thanks again chaps, im thinking along the lines of backlash in diffs, maybe tran box think i will let it develop more, dont think its about to let me down its just annoying...cheers Iain

[thermidorthelobster]

Is it an LT77 box?  In which case is it the classic input shaft lubrication problem?

[Coastcard]

If it is the input/output shaft issue, you can just replace the cog in the transfer box for a crossdrilled one £50-60 from Ashcrofts. I appreciate that the output shaft on the gearbox will also be worn, but I caught it on my 200tdi before it was too knackered and the new cog stopped the worst of it.

[electricbluebadger]

A quarter of a turn in the props!!!!!!!  :shock:

That'd definately cause a bit of a clunk.... are you sure its that much????

thats as bad as my Series 1..... you soon get used to pulling away with the right amount of clutch release :)

Still worth removing the output shaft cover for a quick look.. just in case the output shaft / gear is on its last legs as this will suddenly fail and leave you stranded...

Cheers Steve

[Les Henson]

This is what you should be looking for if it's the output shaft/gear.





Les.

[electricbluebadger]

Removed mine a while ago but definately didnt see a red cross behind it  :lol:

Bl**dy servers...

Cheers Steve

[Range Rover Blues]

A quarter of a turn is way too much for an axle, even when you add in all the wear in the various splined drives of the front end :?