theres slack but where????

[tjsj]

Hi people, just wondering if i could get some help with this, My disco has got a fair bit of play in something but i'm not sure where, if you accelerate and then let off it jerks as something takes up the slack and I have replaced the diff so it cant be that, is it the transfer box??? hope i have explained it well enough  :?  :?

[redhand]

Usual suspect is the propshaft UJ's or the A frame bush or worst case scenario gearbox output shaft.

[tjsj]

ok, I probably sound a bit dim but whats the A frame bush??

[redhand]

it stops the rear axle from rolling backwarsd forwards and fastens to the top of the rear diff.

[tjsj]

o yeah, I know what you mean! I'll have a look at that tomorrow. So you think that the output shaft would break before anything in the transfer box then?

[electricbluebadger]

You have a G reg disco, on all the early discos the output gear was a very weak point, it has no oil feed and all the splines wear out. hence you can buy aftermarket cross drilled ones to alleviate the prob, it was cured later but an awful lot of early discos clunked a fair bit and eventually lost drive when the splines failed.

lucky or a careful; driver to get over 150k on an early disco box, bought two discos over the years very cheap cos of this problem. remove the rear 6? bolted cover plate and check the condition..

Cheers Steve

[electricbluebadger]

o yeah, I know what you mean! I'll have a look at that tomorrow. So you think that the output shaft would break before anything in the transfer box then?

Sorry should have added..transfer box is pretty bullet proof, its the output that drives into the transfer that is the achilles heel.

Cheers Steve

[tjsj]

O ok, well its on 179k at the moment, and I have hammered it ever since i got hold of it about 8 months ago, if i take that cover plate off, what am i looking for??

[Disco-andy]

iv never seen it while on the car, but if you can look in side you should see the end of a splied shaft in the center the input gear. the teath are suposed to be square on both the inner shaft and the center of the gear, but if they are worn the take up in that is your problem.
mine did the same the teath were so worn they were sharp on both the input shaft and the gear.  good luck i hope this isnt your problem as the fix is not cheep

[skiprat]

hi all,

just thought i would jump on the end of this post as i have a similar problem .

from reading bits and pieces i have an idea of what the cause could be, but could somebody give me an idea of how to check the various components???

front/rear diffs, props, etc etc.

many thanks

kris

[Skibum346]

hi all,

just thought i would jump on the end of this post as i have a similar problem .

from reading bits and pieces i have an idea of what the cause could be, but could somebody give me an idea of how to check the various components???

front/rear diffs, props, etc etc.

many thanks

kris

UJ's are easy... climb underneath and grip the prop shaft near the joint and try to rotate it and move it up and down/left and right. If there is movement with respect to the opposite yolk...or... as happened to me last week... rust and needle rollers fall out...  :shock: you have a problem. You can change them yourself... but you need a big vice... a bit of patience and a second pair of hands to take the weight of the prop. They're only a tenner a piece so buy one more than you need just in case... if you get it right first time... it's a spare for next time!  :lol:

You'll have to ask someone else about the diff's though but I suspect your looking for a similar problem... movement off line of centre of the input shaft and excessive rotational play... don't know how much is excessive though!

Good luck.

[dazzawhipple]

I had this on mine I found it was the outputshaft bearing on the transfer box the flanged moved 10mm up and down :shock:

Replaced the bearing and all was fine

[Range Rover Blues]

Add up all the fre play in the gearbox, transfer box, propshafts ujs, diff, halfshaft splines, cv joints and drive member splines, each one will be only slightly worn but it adds up.