Not that I know of but is it the rear that's sagged? If the front then that means a broken leaf or weak leaves on that side and as they are a single length clamped in the centre then new leaves will be required or if you flip them vertically then they will twist in the same direction so that could work

 

There's a good guide with measurements on earlybay.com but the site is offline at the moment. Seeing as your bus is 50 years old then maybe the split screen van club forum might have something. I'll post the earlybay link later once they're back

 

Its the rear.
I've tried on ssvc, but no one really has a definitive answer - lots of try and see / takes a bit of fiddling responses.

Someone on the Smaba has come up with the best answer so far to be honest.

 

I did a similar job on my early bay last year. After I started I got into a downward spiral of confusion and eventually lost count of where I was with the splines.

Once I calmed down, I bought a digital angle finder on ebay and had the whole thing sorted in a couple of hours. Everyone else seems to manage fine with spline counting but I found it very easy to 'lose' an inner spline as the torsion bars can be a bit sticky. I'd highly recommend one of those gadgets as it allows you to fine tune your desired height with ease.

Here's another link in the absence of earlybay:

http://vw.zenseeker.net/Wheels-TorsionBars.htm

 

The chart is for a beetle though. That's the problem.
This is from a response i got on the Samba..

"the figures on the beetle spline chart will differ somewhat versus a bus because beetle and bus torsion bars have different amounts of splines.

Beetles have 44 outer and 40 inner splines, while buses have 48 outer and 44 inner splines.

360 degrees divided by 48 outer splines is 7.5 degrees per spline.
360 degrees divided by 44 inner splines is 8.2 degrees per spline.
Lowering the bus one inner, and then raising it one outer, would only net to about .7 degrees of change. 2 and 2 would be around 1.4 degrees.
Raising it by 5 inners and then dropping it by 5 outers would be around 3.5 degrees (3 degrees and 30 minutes).

According to the beetle chart you need 4 degrees and 10 minutes to get 1 inch of change. To get 4 degrees and 10 minutes on a bus, you would have to do 6 and 6."

This makes sense. But the question that still needs answering is.. will 4 degrees and 10 minutes give approximately a 1" drop on a bus?

 

There's a calculator at the very bottom of that page which allows you to change the number of splines for calculation purposes. When you do, it tells you that +5 outer and -5 inner will give you a 0.98" drop (assuming your trailing arm is 16.5 inches)

 

aah - missed that! That's perfect Aidan!!!

Thanks