MG
The Classic Marque

Hi Flip
Not sure what axle ratio you're using but at those revs, if it's only in 4th gear then it's getting into the area where rear wheel balance comes into play. Is it a drumming type vibration(driveline) or a thumping/slower vibration(wheels) If you can see it in your mirror the tailshaft vib. just makes the pic go blurry where wheel balance is more of a shakey mirror.
What speed on the r...

Hi Flip.

You were asked about the UJs. You haven't replied. How old are they?

Also, you say, "The ribcase has >100,000 KM "

There's a good chance the vibration could be coming from there too.


Yep it would be interesting to know how that T9 modification and support bracket has worked out. It looked really good.

I can't remember which thread that was in. Al...

Just wondering if that means level with the bottom of the threaded section----if it were the top there'd be no need to mention it at all as it would be impossible to fill it higher than the top

Last photo, how i chose to lengthen the shaft. It needs to be about 1/2" longer but the join is within the door so there is plenty of room .
Till next time
John B

Hi All,
Just for future reference all the door handle threads are definitely 2BA.
I've included some photos to help make sense of my verbal ramblings .
Cheers John B

If I were doing another t9 installation I would seriously consider using the support bracket that Alan was, I think, trialling a few months ago. It reportedly avoided the need to cut out the centre of the cross member. It would be good to get an update on how that worked out.

Yes, all the bolts are tight. I can borrow a balanced axle from a friend. I can try that first. It'll take a while before I can swap the axle. I could also have the current axle rebalanced. I'm also considering a T9 gearbox. The ribcase has >100,000 KM. the synchromesh is non existent. I have a 1275 engine with over 80 hp.

From Peter Vielvoye

It is with great sorrow that I have to tell you that Dennis Doubtfire passed away on Tuesday 9th December 2025. He was feeling perfectly fit in the morning but became ill and passed away after being taken to hospital.

I know many of you knew him well and those who never met him are very aware of his great contribution to the register, to the Y type's continui...

Excuse my daft background questions - have you checked the condition and torque of the bolts on both ends of the driveshaft as well as the wheel nuts? Are the rear hub nuts secure? Also are the engine and gearbox mounts secure and in good condition?

Cheers
Mike

Does the sliding joint at the rear of the gearbox move freely in and out? The axle pushes the prop shaft back and forwards as the rear suspension moves. If its binding there it could cause a vibration relating to particular engine revs.