Prop shaft question...

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Sal
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Prop shaft question...

#1 Post by Sal » Mon Jan 25, 2021 7:51 pm

Hello there,

Car - 1973 2.5 PI

When I bought the car the prop shaft was off so about to bolt it back on although both ends are slightly different, one flange is short and the other has a short slimmer shaft before the flange.

Question: which end bolts to the gearbox?

Thanks in advance

Sal
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Alec
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Re: Prop shaft question...

#2 Post by Alec » Mon Jan 25, 2021 8:29 pm

Hello Sal,

the parts book shows the sliding joint end goes to the gearbox.

However I'm sure there are others who say the opposite and I don't expect that you will notice any differnce?

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johnnydog
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Re: Prop shaft question...

#3 Post by johnnydog » Tue Jan 26, 2021 1:04 am

If you search on here, there has been previous debates on this subject, although I can't remember the general consensus of opinion as to the correct or preferred fitment. I know that I have two manual cars with them fitted opposite ways though!
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1967 Mk1 2000 in Gunmetal Grey
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Re: Prop shaft question...

#4 Post by Charles H » Tue Jan 26, 2021 9:24 am

Agree with the above, mine are fitted with the sliding joint at the rear.
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Jonathan Lewis
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Re: Prop shaft question...

#5 Post by Jonathan Lewis » Tue Jan 26, 2021 1:23 pm

I am reasonably sure that the original fitment on manual gearbox cars was sliding joint at the rear axle end, and the lubrication chart in my copy of the owner's handbook seems to support that.

However, the first volume of the Register Service Notes does reference a BL (New Zealand) Service Bulletin from May 1976 on the subject of Vibration Problems: “on manual and overdrive models, reversing the propshaft end to end … can sometimes influence the vibration level”.
Last edited by Jonathan Lewis on Tue Jan 26, 2021 3:49 pm, edited 1 time in total.

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Re: Prop shaft question...

#6 Post by johnnydog » Tue Jan 26, 2021 1:46 pm

The similar principle of a the sliding spline and UJ exiting from the gearbox on a BW35 auto Triumph doesn't seem to have any adverse affect relative to driveline vibration.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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Re: Prop shaft question...

#7 Post by Sal » Wed Jan 27, 2021 10:12 pm

When you say ‘sliding joint’ what do you mean?

Do you mean the end with the slimmer joint?

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Re: Prop shaft question...

#8 Post by Charles H » Wed Jan 27, 2021 11:03 pm

Yes, the slim end slides in and out.
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Cherry Red Mk1 2000 Rally Car
Mallard Blue 2.5PI
Sapphire Blue GT6 Mk3
Vermillion Red Spitfire 1500
Pimento Red TR6
Inky Blue VW Passat B5.5
Arctic Blue Jaguar XJ40

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