Slack Drive

woods767 · Jan 26, 2009

Got a hurendous case of drive slack, all the UJs are fine, i have no idea wher its coming from. Jolts back and forth if its driven with no pressure to the drive fron the engine, and klangs on gear changes. Genrally ruins the car makes it no fun to drive.

Discojamz suggested it may be the A-fraim ball joint, how would i go about checking that? Got any other ideas?

Cheers, Rich.

Tig9619 · Jan 26, 2009

get someone in it and rock it on the clutch while you have a look at the ball joint soo if its moving. or get underneath with a big pry bar and see they way.
or lift a back wheel with it in gear and rock the wheel forward and back. you should see/hear if its gone.

Oddie · Jan 26, 2009

transfer box input drive?

Tig9619 · Jan 26, 2009

common problem on early stuff!

Oddie · Jan 26, 2009

yeah. You should be able to trace the slackness. Put the handbrake on, chock all wheels really well, raise a rear wheel, see how much i turns. If a lot, the slack is in the UJs or diff, but you can see all the bits moving so it ahould be easy to see where the slack is. If there isn't any, do the same to a front wheel. You can follow the movement right to the static point, which is the locked rear prop, and see if the main part of movement is, halfshafts, diff, UJ or Transfer box. MAKE SURE YOU CHOCK THE WHEELS REALLY WELL THOUGH!!!

discomania · Jan 26, 2009

It could be your splines on your props, I have this problem right now, I can turn the two halves about 1/4 of an inch independently of each other, its causing exactly the same problems.

Oddie · Jan 26, 2009

discomania said:
It could be your splines on your props, I have this problem right now, I can turn the two halves about 1/4 of an inch independently of each other, its causing exactly the same problems.

In that case change em quick as the splines are less than 1/4" wide so if you can turn them more than 1/4" then in theory you have no splines left, just a smooth pole within a smooth pole, so unless yer transfer box is stuck on diff lock, not too sure how you're getting anywhere!!!

woods767 · Jan 26, 2009

Its not the UJs and it had better not be the transfer box, put another disco one in it 6 months ago. Not the propshaft splines, wouldent cause this much slack. Will check the A-fraim ball joint, seems like theres a nocking noise fron the back.

hughesy · Jan 26, 2009

A knackered a-frame ball joint won't cause slack in the drivetrain just lots of clonking etc. If it's not your propshafts it could wel be worn splines in your gearbox or transfer box or very worn diffs and/or halfshafts.

woods767 · Jan 30, 2009

Found some slack. Ive got about 50-60 degrees slack on one wheel if i jack up one corner and spin it whilst in gear with the diff lock out.

Whilst overtightening a buggered wheel bearing on the back, i found the splines on my rear drive flanges are about the same size as needles, both the back are the same, probaly acounts for about 5-10 degrees together. I will probaly change the rear half shafts too, theres probaly some worn splines at the other end too.

oil dripper · Jan 30, 2009

fook i thought Pikey,s cousins had payed yer a visit then wen i seen the title :doh::hysterically_laughi:hysterically_laughi:

woods767 · Jan 30, 2009

Do sailsbry axels have the same half shafts as the standard axels?

Sirus · Jan 30, 2009

oil dripper said:
fook i thought Pikey,s cousins had payed yer a visit then wen i seen the title :doh::hysterically_laughi:hysterically_laughi:

It says slack drive not slack arse:doh::alien:

hughesy · Jan 30, 2009

woods767 said:
Do sailsbry axels have the same half shafts as the standard axels?

No.

Oddie · Jan 30, 2009

Slack to that extent is quite normal, you have the slack from both wheels, both sides of the transfer box, both diffs, any slack from 3 UJs (presuming you checked your UJs with the HANDBRAKE OFF), there is always a bit - see if you can trace it by getting someone else to turn the wheel and see which joints have te most difference in movement either side of them while you look at it from underneath with a torch.

discomania · Jan 30, 2009

odenne said:
In that case change em quick as the splines are less than 1/4" wide so if you can turn them more than 1/4" then in theory you have no splines left, just a smooth pole within a smooth pole, so unless yer transfer box is stuck on diff lock, not too sure how you're getting anywhere!!!

They are sort of rounded, perhaps the 1/4inch thing was a bit of exageration, but if you hold the two halves you can get it to move a fair bit.

Tig9619 · Jan 30, 2009

24 spline shafts and flanges do have a habit of wearing out quicker than the older 10 spline stuff. seen plenty of 300 discos with stripped shaft splines.
one of those things!

woods767 · Jan 30, 2009

Do normal drive flanges fit? I need to change the half shafts and drive flanges (and that wheel bearing why not), on a sailsbury axel. Paddock spares dont seem to cater for them.

woods767 · Jan 30, 2009

THis is the play between the half shaft and drive flange on the rear;

Splines.flv video by woods767 - Photobucket

Trewey · Jan 30, 2009

woods767 said:
THis is the play between the half shaft and drive flange on the rear;

Splines.flv video by woods767 - Photobucket

That's fooked.
New half-shafts and drive flanges needed.

Slack Drive

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Cockernee, Pasty munchin bastid.

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