Maximum spacer for a Propshaft?

[ChasR]

The CV jointed prop I recently bought for my Stag is a little too short. I have the choice making it longer (and putting on a new tube as a result) or returning it.

Before I send it off (or get it made longer) what is the largest spacer you can fit between the end of a propshaft and diff? I have seen a few guys on here do this but was wondering how large a spacer I could get away with.

The CV prop is around 1 metre long with the one currently on the car being 2-3 inches longer as you can see with it being on the floor in comparison to the old one.

[andyborris]

May be a stupid question, but have you extended it?

Most propshafts have one end which slides into the tube by a few inches.

[MrSpeedy]

You've replaced the original U/J shaft with a C/V one? Hmmm, that will limit the linear slide a lot. However, if you get a spacer made that is properly machined with good fitting registers, then a couple of inches should be fine. I might be tempted to use aluminium to keep the mass down.
We use steel pcd adapters on propshafts daily but only an inch thick and at a much reduced max sorted speed of 750 rpm.

[Seth]

The one I made for the Herald was 2" I think.



As Speedy says, you need to make sure the registers are the right fit for the prop an diff and get bolts the right length too.

[ChasR]

I have not extended the CV prop no. Unlike the item currently on the car the CV prop is of a fixed length with no slider built into it. Also my gearbox has a flange on the back for the flange of the propshaft to bolt onto.

Feb 28, 2012 20:09:05 GMT MrSpeedy said:

You've replaced the original U/J shaft with a C/V one? Hmmm, that will limit the linear slide a lot. However, if you get a spacer made that is properly machined with good fitting registers, then a couple of inches should be fine. I might be tempted to use aluminium to keep the mass down.
We use steel pcd adapters on propshafts daily but only an inch thick and at a much reduced max sorted speed of 750 rpm.

No, but I am still considering it (the centreline of the gearbox and diff (if seen from the side of the car) do no match although the photos do not depict that well). On the basis that I am not sure whether jacking up the rear of the gearbox will cure this issue of the centrelines running parallel (I may run into space issues around the bulkhead :S) the CV prop I acquired is still being considered as an option.

Would the linear slide be an issue with the gearbox and diff position being fixed on the car (I will admit that despite this bar the alternative modern day CV propshaft on the manual, all Stags did come with sliding propshafts)?

Seth, after seeing that, at least I know it can be done . Keeping the registers would be adhered to . I assume that is something you made up?

[andyborris]

Sorry, I assumed that it was a direct replacement for a worn shaft.

Now understand that it's for a conversion. my mistake!