The Triumph 2000/2500/2.5 Register Forum

Hi have a 2000 & stag both with straight six & manual gearboxes on checking oil levels on diffs & gearboxes noticed that props were different ways around question should the slider be at diff end or gearbox end or does it matter as both cars drive ok? tia cheers

Hello T2000,

from the Triumph parts book it shows the sliding end at the gearbox. I suspect that there is little real difference which way round it goes?

Alec

When I first got my car in 1981 the prop was fitted with slider at the gearbox, after joining the register in the early days I recall a letter from a member saying the correct way was to have the slider at the diff although it was claimed in the letter that a BL dealer solution in those days was to swap the prop around to cure vibration, many years later I have a new prop fitted the proper way, I can't really say prop vibration has been an issue with my car unless the uj's were worn.

I was asked this very question by a Register member who was having a new diff fitted and the garage queried whether the prop was correctly fitted.
As Alec states the official manual states the sliding joint is fitted at the gearbox end. HOWEVER, in the service notes, the general consensus is that it should be fitted at the diff end. This also gives more clearance for the handbrake cable fork which can 'bounce' and hit the prop /diff if there is too much slack in it.
But why then on an automatic is the sliding joint at the front and the fixed end at the diff?
My S and Mk1 man / o'drive both have the sliding joint at the diff end and I have not noticied any issues. My Valencia blue 2000 which is very low mileage has the sliding joint at the gearbox end, and I have no reason to believe the prop has ever been off from new, and it is as smooth as silk!
I personally think that there are advantages for it being fitted to the rear, but if the car was smooth and vibration free prior to removal, then fit it as it came off. It is very wise to mark the prop flanges to ensure correct alignment when refitting. If you suffered from vibration (assuming that uj's and gearbox mounting are in good order), then try it the other way round to see if it improves matters.
In short, I think they can be fitted either way without any particular ill effects.

John
The prop can only be fitted on the flange in one position because the bolt holes are at odd spacings, so not a problem if it has not been marked!

It can be fitted 180 degrees (or a half turn) out from how it came off though Charles - I accept not 90 degrees because as you say the holes are offset.

Surely props are sold ready-balanced, or else if you are concerned you can get it balanced. Is there a facility for balancing the entire transmission, in situ? Do people really do that?

johnnydog wrote: ↑

Thu Jul 12, 2018 1:24 pm

It can be fitted 180 degrees (or a half turn) out from how it came off though Charles - I accept not 90 degrees because as you say the holes are offset.

I don't think it can! You can get three bolts in but not four! Could be wrong of course, but I am 90% sure

Hello Charles,

yes, it can be fitted two ways. The bolt plan is a rectangle so 180 degrees is fine.

Alec

I stand corrected!