Thread: Converting 1954 CVs to earlier Tracta Joints - Whats involved?

A couple of things;

The inside half shaft for the 80" Tracta joint is located by a ball bearing and this is in turn fastened by sleave that is shrunk onto the half shaft and to service this, a workshop press of twenty tonnes is required to dismantle the shaft from the swivel pin ball housing.
To take the diff out of the front of a 80", the flanges at the inside of the swivel pin housing's to the diff housing has to be separated, to be able to withdraw the axle half shaft's from out of the diff centre.

The 1954 to late Series 3 had Universal Joints in their front axles, not Constant Velocity Joints ( CV's ), but I know what you are getting at, that is that kick in the steering experienced when powering on full lock.

I don't know of any modification that allows a Discovery or similar, CV to be fitted into the early swivel pin ball housings and I would like to know if this has been done?
The Stage one had CV's, but the diff housing is longer than a Series 1 , so the whole front axle assembly would need to be changed over.
.

Originally Posted by wrinklearthur

...

I don't know of any modification that allows a Discovery or similar, CV to be fitted into the early swivel pin ball housings and I would like to know if this has been done?
The Stage one had CV's, but the diff housing is longer than a Series 1 , so the whole front axle assembly would need to be changed over.
.

Maxi drive used to machine the inside of series chrome balls to allow 110 AEU2522 cvs to be fitted.

Worth noting that there are plenty of 4x4s which were constant 4x4 with ujs.

Originally Posted by wrinklearthur

A couple of things;

The inside half shaft for the 80" Tracta joint is located by a ball bearing and this is in turn fastened by sleave that is shrunk onto the half shaft and to service this, a workshop press of twenty tonnes is required to dismantle the shaft from the swivel pin ball housing.
To take the diff out of the front of a 80", the flanges at the inside of the swivel pin housing's to the diff housing has to be separated, to be able to withdraw the axle half shaft's from out of the diff centre.

The 1954 to late Series 3 had Universal Joints in their front axles, not Constant Velocity Joints ( CV's ), but I know what you are getting at, that is that kick in the steering experienced when powering on full lock.

I don't know of any modification that allows a Discovery or similar, CV to be fitted into the early swivel pin ball housings and I would like to know if this has been done?
The Stage one had CV's, but the diff housing is longer than a Series 1 , so the whole front axle assembly would need to be changed over.
.

Thanks Arthur.
Apologies for using the word CV, I did of course mean UJ. So I guess my question is how easy is it / is it possible to replace my 1954 86" UJ half-shafts with tracta-joint half shafts out of an 80 whilst retaining my diff.

Thx
J

The tracta joints had the different bearing on the diff side and they also had a brass bush inside the stub axle. I believe this was because they needed to be kept in place more solidly than a universal. While they are a fascinating joint it would be difficult to find one in really perfect condition as it is now sixty years since they were used. However to answer your question there is no good reason why they could not be swapped in as long as you use the right bearing. The later swivel housing actually has more room so won't be a problem.

Cheers,

TimJ

Originally Posted by Timj

The tracta joints had the different bearing on the diff side and they also had a brass bush inside the stub axle. I believe this was because they needed to be kept in place more solidly than a universal. While they are a fascinating joint it would be difficult to find one in really perfect condition as it is now sixty years since they were used. However to answer your question there is no good reason why they could not be swapped in as long as you use the right bearing. The later swivel housing actually has more room so won't be a problem.

Cheers,

TimJ

Correct - the universal joint, and the later Rzeppa joint are self aligning, whereas the Tracta joint (actually, when you analyse it, really a double Cardan joint) requires external alignment.

While both types of joint date from about the same time (Tracta 1926, Rzeppa 1927), the Tracta joint remained the CV of choice until the late 1950s. The reason for this is that the Tracta joint is easy to manufacture, being tolerant of inaccuracies or wear, and because of the large bearing area, not very demanding of materials, whereas the Rzeppa joint is very difficult to manufacture as it needs to be very accurately made, and heat treatment, materials and lubrication are critical.

This suggests that manufacturing new Tracta joints should not be beyond the capabilities of any modest engineering workshop that seriously wants to do it.

Originally Posted by JDNSW

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This suggests that manufacturing new Tracta joints should not be beyond the capabilities of any modest engineering workshop that seriously wants to do it.

However it would probably be cheaper and easier to get the balls and stub axles machined to take aeu2522 or rrc cvs. You would also have off the shelf replacements.

Barry at hitough probably still does this, and can supply the right inner halfshafts.

I spoke to Barry at Hi-Tough and he advised he can't do the machining and further suggested that Id be OK to keep the UJs.

He said (similar to my initial thinking) that because the LT230 has a centre differential then there would be no transmission wind up and so the UJs would be fine, i.e. no need to replace with Tracta's or the later CVs.

Also, not sure if it complicates things or makes things better for me - my front axle has free wheeling hubs fitted. This means that I either need to engage them all the time to get movement, or keep them dis-engaged and engage the centre diff to allow forward movement.

For now I'm going to leave the UJs in place and see how I get on.

Thoughts please.

Thx
Jon

Originally Posted by Yorkshire_Jon

I spoke to Barry at Hi-Tough and he advised he can't do the machining and further suggested that Id be OK to keep the UJs.

He said (similar to my initial thinking) that because the LT230 has a centre differential then there would be no transmission wind up and so the UJs would be fine, i.e. no need to replace with Tracta's or the later CVs.

Also, not sure if it complicates things or makes things better for me - my front axle has free wheeling hubs fitted. This means that I either need to engage them all the time to get movement, or keep them dis-engaged and engage the centre diff to allow forward movement.

For now I'm going to leave the UJs in place and see how I get on.

Thoughts please.

Thx
Jon

Most LR people don't think you can have constant 4x4 with UJs, however Jeep (and others) did it for many years. You may get some slight feedback in the steering wheel on tight corners, but that is all.