Juddering differential
Discussion
Quick question regarding a strange quirk of my new differential.
When it's cold, the diff feels fine. Driving around town, the diff feels fine. After a longish (30 mins) motorway drive, a wierd effect happens. The next few times I come to a complete stop, the back of the car judders when pulling away, almost as if the tread blocks are fighting against each other. This happens in a straight line and disappears above 5-10mph.
If I leave the car standing for a while, the effect disappears, implying it's heat related. Is this a normal symptom of running in a differential (it's now done 700 miles) or is it something to be worried about?
Thanks,
Ian A.
When it's cold, the diff feels fine. Driving around town, the diff feels fine. After a longish (30 mins) motorway drive, a wierd effect happens. The next few times I come to a complete stop, the back of the car judders when pulling away, almost as if the tread blocks are fighting against each other. This happens in a straight line and disappears above 5-10mph.
If I leave the car standing for a while, the effect disappears, implying it's heat related. Is this a normal symptom of running in a differential (it's now done 700 miles) or is it something to be worried about?
Thanks,
Ian A.
Mine doesn't exactly what is described in www.pistonheads.com/gassing/topic.asp?t=23101&f=6&h=0&hw=diff+clunk (right turn after a run).
_DJ_ said:
Mine doesn't exactly what is described in www.pistonheads.com/gassing/topic.asp?t=23101&f=6&h=0&hw=diff+clunk (right turn after a run).
This is a GKN (Salisbury plate) diff so can this really be the same effect as a BTR Hydratrak diff (as fitted to the Cerberas)?
IPAddis said:
No, nothing to do with the clutch.
What was the solution Trefor? New/reconditioned diff?
Well my diff was rebuilt twice. First time the replaced the bearing (Which were whining - fair enough). They couldnt find the source of the grinding and it didn't do it on their test bench/road test. It went back a second time and they had to run the diff on a test bench until it was nice and hot and they then noticed hairline cracks in the CW&P (not sure which one, but they are a matching pair). This was then replaced with a new set of bearings. Since I had an older style Chimaera diff (GKN I think) they had real trouble finding a CW&P. Might be easier to just drop a newer style diff in.
Of course, this might not be your problem ...
This fault really annoyed me as I'm not the donutting type - heck my rear tyres lasted nearly 20,000 miles before needing replacement.
trefor said:
It went back a second time and they had to run the diff on a test bench until it was nice and hot and they then noticed hairline cracks in the CW&P (not sure which one, but they are a matching pair). This was then replaced with a new set of bearings. Since I had an older style Chimaera diff (GKN I think) they had real trouble finding a CW&P. Might be easier to just drop a newer style diff in.
I hope it isn't that!. It's supposedly a brand new diff. It isn't an easy job to install a newer one, chassis mounts are different.
Thanks for the info.
Ian A.
Brand new as in sat outside at TVR for a few years. Unused from new perhaps is a better description.
PS. I have dougnutted the car in the past and although the limited slip plates on the last diff expired, it was still working perfectly in "normal" mode.
>> Edited by IPAddis on Thursday 25th March 13:55
PS. I have dougnutted the car in the past and although the limited slip plates on the last diff expired, it was still working perfectly in "normal" mode.
>> Edited by IPAddis on Thursday 25th March 13:55
You can get your diff rebuilt by the Bernie at www.gearboxman.co.uk/
griff2be said:
You can get your diff rebuilt by the Bernie at www.gearboxman.co.uk/
Thanks but I'm not paying for a brand new diff to be rebuilt. I'm stupid but not that stupid!
IPAddis said:
You can get your diff rebuilt by the Bernie at <a href="http://www.gearboxman.co.uk/">www.gearboxman.co.uk/</a>
Thanks but I'm not paying for a brand new diff to be rebuilt. I'm stupid but not that stupid!
Alright - easy Tiger!!
I missed the word 'new' in your first post.
You could just call Bernie and describe the symptoms to him and ask his advice.
i wasn't aware there were any new diffs, i paid almost 700 pounds for a rebuilt gkn diff from tvr 2 years ago. they rebuild using the best bits of alot of u/s diffs and hope the end result is ok, at least that's what i got. if you really managed to get a new diff you're very very very lucky!! 
griff2be said:
Alright - easy Tiger!!
I missed the word 'new' in your first post.
You could just call Bernie and describe the symptoms to him and ask his advice.
Sorry mate, didn't mean to rip your head off. I was trying to say that it was a new diff and hence I wasn't going to pay for it to be rebuilt, even though I am a mug when it comes to paying for stuff. Unfortunately, I was also trying to have a simultanious conversation about database design and hence the desired level of humour got missed out.
My apologies.
joospeed said:
i wasn't aware there were any new diffs, i paid almost 700 pounds for a rebuilt gkn diff from tvr 2 years ago. they rebuild using the best bits of alot of u/s diffs and hope the end result is ok, at least that's what i got. if you really managed to get a new diff you're very very very lucky!!
Apparently TVR have a bit of a secret stash. I also thought I was lucky to get a "new" diff but only if it works as expected.
I'm sure Peninsula (who fitted the diff) will sort it out as they are already on the case. I just wanted to save myself a 150 mile round trip by checking to see if anyone has had similar symptoms.
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