can anyone shed any light on this,when the auto shifts up or down the gears its fine but if you go on and off the throttle in third or forth there seems to be a clunking noise as if theres severe backlash in the diff whch there isnt,it drives fine no vibration ,any ideas anyone also the car seems to surge slightly at 60-70 mph cheers in advance mark

does this happen at the same revs in most gears?

also the thng seems to hang on to first gear as if its never going to see it again ,fine in hold mode though..........

does this happen at the same revs in most gears?[/QUO

i takke it your on about the surging,dont notice it through the gears seems only to be at motorway speed itll accelerate out of it fine

i takke it your on about the surging,dont notice it through the gears seems only to be at motorway speed itll accelerate out of it fine

 

 

 

No, the backlash, is it at the same revs in 3rd or 4th?

yea suppose it is thinkin about it

If it is, then i have the same problem. i have replaced the clutch, propshaft and diff and it makes no difference - it has to be the gearbox input bearing.

 

You need to replace this or fit a better gearbox........

might go down the manual conversion route in time just bugin me whats causing it

I'm gona live with mine untill the box blows up.......

yea might not be a bad idea get the full monty out of it

Seems like you have more than one issue, I would start with getting the engine set up checked out as I suspect that may have some bearing on it.

 

Holding onto 1st gear is usally an incorrectly set tps ( throttle position sensor)

(If backing off the throttle makes it change from 1st to 2nd a bit quicker it definately is the tps) When the "hold" mode is used 1st gear is not used so it pulls away in 2nd hence the reason the long change is gone, also so will be the quick pull away!! good for use in ice conditions though.

 

Shunting in 3rd and 4th that feels like backlash could be an issue with the gearbox mount or even an issue with the engine, possible high speed misfire / air leak

 

Get an engine ConZult diagnostic done and a visual inspection for the gearbox mount.

 

Jeff TT

cheers jeff wiil have a look at that

Additionally, mines a manual and I’ve changed the gearbox mount too. Rattles at just under 2000rpm.

 

It will be a trip to see Jeff and Jamie for a Gearbox swap one day when I can afford to have a NA sub frame and new prop as well, oh and a lightened flywheel.