Gearbox backlash

[Magpie1832]

Hi guys. When driving past walls and I let of the accelerator and back on I get click or clunk. If I'm going slow in wrong gear I ratlles like hell. I've checked driveshafts. I've had them off and it seems there is a fair bit of gearbox backlash on the diff. How much is excessive on a t6. I know on normal cars it's normal to an extent as I see it all time at work.

 

[kirkm5238]

Hi guys. When driving past walls and I let of the accelerator and back on I get click or clunk. If I'm going slow in wrong gear I ratlles like hell. I've checked driveshafts. I've had them off and it seems there is a fair bit of gearbox backlash on the diff. How much is excessive on a t6. I know on normal cars it's normal to an extent as I see it all time at work.

Mine dose this what gear box is yours

 

[Magpie1832]

I have 5 speed box. 102 engine. It's quiet annoying sometimes.

 

[Littleblackflash]

my 5speed box does the same.

coming on and off throttle can also cause the click/clunk

 

[kirkm5238]

my 5speed box does the same.

coming on and off throttle can also cause the click/clunk

I can here mine do it if your next to a wall with windows down and get the same sort of noise over pot hole if not on gas mines a 6spd 140 only got 30k on it had Egr problem oil cooler leak power steering pump leaks lol

 

[Pete C]

My 5 speed box does the same - a small click due to drivetrain slack when I come off the power sharply.
99% of the time I‘m not aware of it.
It did it when we got the van at 14,000 miles, and it’s exactly the same now at 30,000.

Pete

 

[mmi]

Another source for click type of sound is dual-mass flywheel centrifugal pendulums moving in their floating bearings - when coming on and off throttle - even gently.

T6 DMF on pp. 9-10 in

SSP 564 - The T6 2.0L TDi

VW Self Study Programme, Document 564 - The 2.0 litre TDI Engine In The T6 The introduction of modern, particularly efficient Euro-6 engines represents a central feature of the new T6. All units are equipped with Blue Motion Technology as...

www.t6forum.com

 

[Magpie1832]

Mine isn't dmf. I had it on the ramp at work and when jacked up move one wheel back and forward you get gearbox backlash. Some cars/vans more than others due to wear. Mine has a fair.
A bad dmf usually vibrates and shakes the van to death.

 

[kirkm5238]

Mine isn't dmf. I had it on the ramp at work and when jacked up move one wheel back and forward you get gearbox backlash. Some cars/vans more than others due to wear. Mine has a fair.
A bad dmf usually vibrates and shakes the van to death.

Do think big wheels make it worse

 

[Magpie1832]

Do think big wheels make it worse

Big in which way. Mine are 18s. Same as standard sportline. Plus was doing before wheels went on.

 

[kirkm5238]

Just with them being a lot heavier then the original ones i wounded if it damages the gearboxes ect the 20s feel a lot heavier

 

[Magpie1832]

It shouldn't make a difference really. Yes a 20" wheel has a different ratio for the speed but wouldn't cause it to have backlash. That is in the dif. I don't know if the vw box has weak dif bearings but it definitely has a lot of dif backlash.

 

[rabguy93]

did anyone get to the bottom of this issue as i am about to accidentally set mine on fire its driving me crazy i have spent a fortune trying to find the cause next thing im buying is a new gear box

 

[DXX]

Could also be the driveshaft splines.
5 speed boxes and drive shaft splines are a known weakness, better to investigate and repair than loose drive and be stranded.