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Post by Penguin45 on Aug 10, 2020 12:12:05 GMT
Originally posted by Stuart over on the Wolseley Forum - he'll most like get a better response here! He's got an 18/85 and is in Oz.
Any thoughts welcome.
C.
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Post by dave1800 on Aug 10, 2020 14:16:26 GMT
Nick is our diff expert, hopefully he will be along soon. I seem to recall that it may not be that straight forward a swop given the fact that from memory trying to use automatic parts in a manual crab is problematic.
Tony W is probably the best person to advise on seals etc once the part numbers have been identified.
David
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Post by 1800heap on Aug 12, 2020 8:08:35 GMT
Hi Guys
Sorry too much going on. I haven't had a chance to post for ages!
There are only two options to my knowledge as noted in the WM the 16/67 4.187:1 and the 17/66 3.882:1. I can tell you that the auto diff 18/69 does not fit in a manual box, as I have tried it. A 69 is too big and hits the housing. Even if you ground the housing the spacing is incorrect!
I can't tell you anything about the princess diff ratio. I can't even find the options for it! Assuming the same size teeth, you would have to be looking at a 18/65 to stand any chance and you would have to hope that the mesh is correct! Im not that keen to try find that combo sorry.
Better option would be larger diameter wheels which is in itself a challenge on the crab to make them fit! You would also require a speedo re-calibrate and a mod plate in Oz to make such a change legal I would think. I believe you can only go up 1 size legally under the ADR's! I could be wrong on this though so don't quote me!
As for spares the mgb diff washer kit fits the crab. The bearings will likely be ok on your diff but you will need to be careful to reset the preload if you pull it apart. You may get bearings but I have not tried. By the way the diff housing matches the gearbox and can not be substituted!
Good Luck
Nick
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Post by 1800heap on Aug 12, 2020 8:59:51 GMT
Just to clarify, the auto diff is the same as the manual diff but the gear must be exchanged for the correct type for it to be usable in a manual.
Nick
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Post by foglaursen on Aug 13, 2020 8:03:09 GMT
According to Haynes the differential ratio for the Princess is 3.72:1 (manual). I have fitted a Princess gearbox (rod gear change) to my Wolseley. Peter  |
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Post by 1800heap on Aug 13, 2020 21:42:37 GMT
Thats interesting thanks Peter. To me that would suggest a different tooth profile if the gears fit the crab as that ratio would be 18/67 so not possible with the crab setup. It already uses a 16/67 so you dont have the space for a 18 tooth gear with the crab 67 gear. The 18 would be quite a bit larger! I wonder if there is any truth to them fitting? Perhaps they mean a whole box change as you did Peter. Nick According to Haynes the differential ratio for the Princess is 3.72:1 (manual). I have fitted a Princess gearbox (rod gear change) to my Wolseley. Peter |
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Post by 1800heap on Aug 14, 2020 5:34:36 GMT
Dug up an auto box 18 tooth gear and it is around 65.5mm OD and the 16 tooth manual gear is 59.5mm OD so no way an 18 will fit in the crab box with a 67. If the Princess tooth profile is the same as the crab the princess diff has to have a different offset to the crab. If not the tooth profile is not the same as the crab. I would like to know which is the case! My money is on a different offset.
Nick
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Post by james on Aug 14, 2020 6:10:20 GMT
So just a hypothetical here.... and assuming I had one... Would a manual princess gearbox/diff etc from 1975-ish, fit on and in a Mk1 Austin 1800 manual engine/engine bay? Is there a benefit for a car that is dedicated to race/rally? Thanks  |
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Post by foglaursen on Aug 14, 2020 8:11:23 GMT
Yes. I have fitted it to my Wolseley MKI from 1967. Some modifications are required. If you keep the rod gear change (as I did) the hand brake cable is in the way. I don't know if you can use the cable gearshift. Also the drive shafts need to be the sliding joint type. Peter |
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Post by 1800heap on Aug 14, 2020 8:44:40 GMT
You have to change one of the forks in the gearbox to swap between rod and cable I think so not a straight swap. Peter what are the overall ratios like on the princess box on your crab? More suitable for highway speed or acceleration from stopped? I think that is what James is interested in and me!
Nick
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Post by foglaursen on Aug 14, 2020 9:08:49 GMT
As I have the original setup on my Morris MKI, I am able to compare. The Wolseley is better for motorway use. Apart from that, I don't notice any significant difference. Peter |
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