Clunky drive, broken something!

[DangerousDerek]

So I managed a weekend at Shakey with no issues.
Took the car out to a local car meet today and somethings not happy under load at the rear.
It feels like somethings broke or suddenly out of balance.
Ive got the car jacked up and all seems fine with the usual play in the drivetrain.
Both rears are turning together and I cant feel any knocks.

I suspect the diff or maybe the gearbox.
Any ideas on how to locate the problem?

[phazed]

When I had on and off power clunking at the rear it turned out to be the rear diff mount.

You don't need this with your busy calendar!

Bit more of a description?

[DangerousDerek]

phazed said:

When I had on and off power clunking at the rear it turned out to be the rear diff mount.

You don't need this with your busy calendar!

Bit more of a description?

Its a constant clunk when under load. Gonna go and see if I can feel any play in the CVs

[phazed]

It is always difficult to feel for play in the CV joints.

That sort of noise won't be the prop shaft joints.

Let us hope it is not the diff!

[DangerousDerek]

rear end feels smooth enough.
The flywheel feels solid so rules out that coming loose.
I might drop the diff and gearbox fluid and see if that tells a story

[Barreti]

Broken tooth on the crown wheel in the diff was the result of my clunking under load.
I hope it's not that because it was a bugger to find and only confirmed by pulling the diff out and stripping it.

[phazed]

Hmmm, that might of been the penalty of dropping the clutch on drag radials when you achieved that 11!

[DangerousDerek]

phazed said:

Hmmm, that might of been the penalty of dropping the clutch on drag radials when you achieved that 11!

Yep and not even with nitrous.
I think I am gonna have to start stripping it

[phazed]

DangerousDerek said:

phazed said:

Hmmm, that might of been the penalty of dropping the clutch on drag radials when you achieved that 11!

Yep and not even with nitrous.
I think I am gonna have to start stripping it

Feck!

[DangerousDerek]

I have play on the offside diff driveshaft flange.
Bearing maybe?

[phazed]

My diff has quite a lot of play considering.

[77racing]

Barreti said:

Broken tooth on the crown wheel in the diff was the result of my clunking under load.
I hope it's not that because it was a bugger to find and only confirmed by pulling the diff out and stripping it.

I had that happen on the cool down lap after qualifying 9th on a 70+ car grid at Spa Francorchamps a few years ago. Spent four days watching the racing I really hope that's not the case for you Dereck.

ps it sounded like a continueus clonk on slight power on, put it up on axle stands and run it to diagnose diff issue be what I would do

[DangerousDerek]

When I say play I mean across the flange not rotational.

The diff is half out. Will remove it in the morning and hoping John Reid can sort it by Friday

[phazed]

DangerousDerek said:

When I say play I mean across the flange not rotational.

Ahh! Sounds shagged!

Have you had it rebuilt before? If so how long has it lasted?

[DangerousDerek]

phazed said:

Ahh! Sounds shagged!

Have you had it rebuilt before? If so how long has it lasted?

John Reid rebuilt it with the 3.08 gears about 2 years ago. Not a many miles but a lot af drag abuse.

[Matthew Poxon]

John Reid is one of the best out their for TVR boxes and diffs. Might be worth having a chat with him to see whether he can build you a stronger one. I can see a full bore launch on drag radials being very harsh on the drivetrain components!

[ClassiChimi]

DangerousDerek said:

When I say play I mean across the flange not rotational.

The diff is half out. Will remove it in the morning and hoping John Reid can sort it by Friday

Your dedication is increadable, sorry to here this Derek,,keeping fingers crossed. ;(

[OleVix]

ClassiChimi said:

DangerousDerek said:

When I say play I mean across the flange not rotational.

The diff is half out. Will remove it in the morning and hoping John Reid can sort it by Friday

Your dedication is increadable, sorry to here this Derek,,keeping fingers crossed. ;(

was thinking the same thing! My god you have spirit in you Derek

[phazed]

OleVix said:

was thinking the same thing! My god you have spirit in you Derek

He has and as it is nearly midnight possibly another type of spirit as well

[Sardonicus]

Sounds like a failed outrigger bearing Derek Quaife or whatever wont stop that kind of failure its just good ole bearing collapse I would draw the offending output flange from the diff to confirm though it could be a cheap fix as the outrigger bearing stays with the output flange on removal even a planetary gear failure wont cause up and down movement as its supported front and rear by bearings if you broke the stub you would have no drive