Drive Train Slack?

[tricstar]

when driving at low speeds, crawling along at 10-20kph and between on and off power, there is like a clunking-rattling of the drive train, like there is play through the gearbox, clutch and motor, is there any way of getting rid of that?

[jrm]

worn engine/trans mounts?

[tricstar]

worn engine/trans mounts?

just had box out and freshened up ( new syncros etc ) I'll check the mounts are done up tight..

cheers

[Birds]

Being speed related, this will most likely be a diff backlash problem.

[R.3.2.G.T.R]

Being speed related, this will most likely be a diff backlash problem.

rebuild required? or will oil change fix it?

[89CAL]

back lash is how the teeth on the crown wheel and pinion come into mesh. Ummm sorry I'm having a mental blank but im pretty sure to adjust your backlash you move the crown wheel assembly in or out of mesh with the pinion

Not sure how its done on skyline diffs but

an oil change will do nothing if this is the problem

[tricstar]

ok the back lash thing, sounds like it could be it, the front diff is a 2-way os-giken lsd so if it is backlash ( crown and pinion not meshing correctly ) does anyone know a fix for this.....

ps.. its not the normal 2-way lsd noise, I know what that is...

cheers

[89CAL]

Ah crap i didnt know we were talking 4WD lol. But yeah it could be the way the diff was installed, maybe incorrect backlash. probably the easiest way to see is to park the car (On a hoist or pit if possible), get under it with the brakes on and try to turn the drive shafts, Then lift the front two wheels up and with the car in gear try and turn either wheel and see if there is movement in the diff yoke (or however the transfer box is connected to the front diff) and do the same with the back wheels

That might give you some clues as to where the problem is. If its your front diff backlash then with your front wheels off the ground and the car in gear you should hear/see/feel any play in the system

[tricstar]

Ah crap i didnt know we were talking 4WD lol. But yeah it could be the way the diff was installed, maybe incorrect backlash. probably the easiest way to see is to park the car (On a hoist or pit if possible), get under it with the brakes on and try to turn the drive shafts, Then lift the front two wheels up and with the car in gear try and turn either wheel and see if there is movement in the diff yoke (or however the transfer box is connected to the front diff) and do the same with the back wheels

That might give you some clues as to where the problem is. If its your front diff backlash then with your front wheels off the ground and the car in gear you should hear/see/feel any play in the system

...

with the front wheels off the ground, you can only turn them about 50mm or so either way, so just the slack in the diffs and cv's etc I assume... does that sound normal.. maybe I should compare that with the back ??

[89CAL]

yeah i guess hey? Can you take it to a diff/drivetrain specialist. They might be able to do a good test of everything for 20 buks or something

[tricstar]

yeah i guess hey? Can you take it to a diff/drivetrain specialist. They might be able to do a good test of everything for 20 buks or something

funny I rung 4 diff workshops here in perth and not one of them has ever seen of heard of an OS-Giken front 2-way LSD, but yeah might get one of them to look at it anyway

cheers

[Birds]

What do you mean by 50mm?

Rotate the front tailshaft (not driveshaft) back and forth and see how much play it has. It is directly connected to the pinion so you will know if there is a backlash issue there.

Then turn the wheels back and forth to check how much play is in your spider/axle gears, as this can cause clunking too.

[tricstar]

yeah meant with front off the ground the front wheels only turn bout 50mm back and forth, so i assume thats play in the "spider/axle gears"

I haven't tried the front tail shaft for play, but when i put gaerbox back in recently i didn't notice much play in that...

think i'll just have to take it in somewhere and get it looked at