Thread: Discovery 4 Transfer Case Slop / Thud on Engagement

Originally Posted by DiscoDB

…and a sprinkling of Unicorn Horn Dust as a magic friction modifier.

You could buy it from Advanced Factors at a reasonable price previously but now they stock the Ravenol option I think from last time I checked.

Originally Posted by PerthDisco

You could buy it from Advanced Factors at a reasonable price previously but now they stock the Ravenol option I think from last time I checked.

If I couldn’t get the LR oil, I would probably change to Royal Purple Synchromax. Just doing an oil change now, so next one won’t be due for many years yet. A lot can change by the time it is due again.

Thanks guys, I will get underneath this weekend again

Is there anyway to try and narrow down whether trans to TC sines or front or rear output from TC. E.g. remove prop shafts one at a time and check play but also changes in noises when engaging when switching from D to R and back ?

I also notice when coming of the accelerator at lower speeds sometimes there is a bit of a clunk and the rpms drop very quickly from say 1500 down to idle rpms. I assume this is a bit of engine breaking and the clunk is just whatever the backlash is being exposed, gear changes overall are smooth it's just this one scenario/range where it feels like the rpms drop quicker than they used to.

Something just doesn't feel right.

I might also get in and check and clean sensor down at accelerator and clean throttle body.

Trans rebuild was done about 20 months ago and serviced 9 months ago to keep the 2 year warranty, I will also check the fluid level of trans.

Ok, so got back under this weekend.

Check trans fluid level, no issue there.

Looking for play although some noise in Transfer
Case moving from D to R and back it's not bad and doesn't feel like significant play or clunk is there, even though that's where I thought it was the last day.

Playing around it appears there is only very slight radial play in front prop shaft, but easy to push / pull or forward / back play see video.

Also front right half shaft seams to have very little radial play when I try to rotate the shaft, but play in the housing that covers the inner cv and also there is up and down and side to side play on that housing,.see video, is this normal ? is that likely to be the issue ? I've read elsewhere that this is expected to some extent it's the rotational play on shaft that's an issue

Transfer play / noise D to R and back

Originally Posted by loanrangie

Unicorn tears by the price of it.

Originally Posted by DiscoDB

…and a sprinkling of Unicorn Horn Dust as a magic friction modifier.

Which are mixed together by a leprechaun.

Originally Posted by eddielines

Ok, so got back under this weekend.

Check trans fluid level, no issue there.

Looking for play although some noise in Transfer
Case moving from D to R and back it's not bad and doesn't feel like significant play or clunk is there, even though that's where I thought it was the last day.

Playing around it appears there is only very slight radial play in front prop shaft, but easy to push / pull or forward / back play see video.

Also front right half shaft seams to have very little radial play when I try to rotate the shaft, but play in the housing that covers the inner cv and also there is up and down and side to side play on that housing,.see video, is this normal ? is that likely to be the issue ? I've read elsewhere that this is expected to some extent it's the rotational play on shaft that's an issue

Front left inner CV is known to wear and have lots of play. I have replaced both my front CV shafts recently due to the slack/wear in forward/reverse drivetrain direction, but didn’t change the clunk.

I think that front right needs changing, left has no play in any direction.

I also think the front propshaft has had better days.

What did you replace with ? genuine or other ?

Have you put ears or eyes underneath to track down ?

I agree with you it's head wrecking and keen to try and get rid of it.