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Changing From Hardy Spicer Joints To Pot Joints On A 75 Auto


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#1 miniman86

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Posted 10 February 2020 - 07:56 AM

Morning all, quick question. My auto box on my 75 clubby is kaput, and I have another auto box to use, but it's from a later car with pot joints, so I need to change from hardy Spicer's to pot joints. Am I able to keep my drive shafts, or will I need to change these as well?

Alex

#2 Moke Spider

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Posted 10 February 2020 - 08:33 AM

There was a short period around the time your car was made were the output shafts from the gearbox were infact for pot joints, but there was H/S Adaptors factory fitted. Just check the outputs on your existing gearbox. If there's a bolt in the centre of them, then yes, they are old school types, but, if there's no bolt, then just knock them off and fit them on your replacement gearbox.

 

If you do have the old school bolt on types, then you can change the drive shafts to Pot Joint types.



#3 miniman86

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Posted 10 February 2020 - 08:47 AM

There is no bolt in my output shafts, but the outside diameter looks to be bigger than that of a pot joint, where they would go into the oil seal. Hope that makes sense?

Alex

#4 nicklouse

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Posted 10 February 2020 - 11:31 AM

you will need the pot joint drive shafts from a later box if you are using an Auto box that has pot joint fittings.



#5 miniman86

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Posted 10 February 2020 - 11:46 AM

Are the driveshafts interchangeable though or will I need to swap them?

Alex

#6 Moke Spider

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Posted 10 February 2020 - 04:38 PM

There is no bolt in my output shafts, but the outside diameter looks to be bigger than that of a pot joint, where they would go into the oil seal. Hope that makes sense?

Alex

 

Can you post up a photo ?



#7 imack

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Posted 10 February 2020 - 06:04 PM

The outside diameter of the knock on type hardy Spicer outputs is the same as the bolt on type hardy spicer output flanges which is a larger diameter than the pot joint type so you will need pot joint type side plates and seals.
You're going to need pot joint drive shafts too as the h/s shafts are not compatible with pot joints.

#8 1968andyf

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Posted 10 February 2020 - 07:06 PM

Use the diff side plates off the old box with new seals and gaskets as the output flanges you have should fit the pot joint outputs

#9 AP2020

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Posted 25 February 2020 - 08:26 AM

Use the diff side plates off the old box with new seals and gaskets as the output flanges you have should fit the pot joint outputs

 

It's an auto, they only have one side plate...  

 

Later cases (1979 on) take Pot joints (Sliding Birfield) and earlier take either Hardy Spicer that are either knock on type or bolt on type.

 

So in your case you will need to either get an earlier AP2 transmission or later shafts with sliding Birfield, 

 

I'll PM you later as I have the parts 






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