1972 Triumph 2.5 PI Manual gearbox and bellhousing

[Stagdad]

Just been kindly offered a 1972 Triumph 2.5 PI gearbox case and bellhousing for the clutch project i am about to look at.Hopefully they are basically the same ,can someone confirm?

[NickA]

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A1975 parts catalogue for the 2000/2500 had a different part no unless it'spolice spec then it's the same.

Not much help really as I haven't got a parts book forthe PI's

[sjm]

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NickA wrote:

A1975 parts catalogue for the 2000/2500 had a different part no unless it'spolice spec then it's the same.

Not much help really as I haven't got a parts book forthe PI's

Police spec..... I was led to believe that the Stag box was fitted to the 2500PI as it was a stronger box for the police use.

Have you thought about fitting the TR7 5 Speed box, I was led to believe this will fit but you have to machine or is it ream the inside of the bell housing for the clutch to fit. I think from what I have been told this is the same box that was used on the Rover 3500SD1.

Steve

[Stagdad]

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sjm wrote:

NickA wrote:

A1975 parts catalogue for the 2000/2500 had a different part no unless it'spolice spec then it's the same.

Not much help really as I haven't got a parts book forthe PI's

Police spec..... I was led to believe that the Stag box was fitted to the 2500PI as it was a stronger box for the police use.

Have you thought about fitting the TR7 5 Speed box, I was led to believe this will fit but you have to machine or is it ream the inside of the bell housing for the clutch to fit. I think from what I have been told this is the same box that was used on the Rover 3500SD1.

Steve

That's the lt77 Steve ,I just want to sort the clutch by using other release parts and need a bellhousing and box for measuring purposes.

Cheers Steve

[StagnJag]

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I have a hunch that the casting is the same, but the gearbox output shaft is longer on the Stag. Someone else will have to confirm though!

Rgds

Dave

[whereufromnosecity]

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Steve

I had a 2500tc engine fitted to mine when i firstgot it, when i swapped back to TV8 power i had to swap the box as well due to the input shaft of the 2500 box being shorter and having different sizedspines

Didn't take much notice of the bell housing but the starter is on the opposite side

Stu E

[StagnJag]

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I meant to say input shaft .:P

[flying farmer]

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Stagdad wrote:

Just been kindly offered a 1972 Triumph 2.5 PI gearbox case and bellhousing for the clutch project i am about to look at.Hopefully they are basically the same ,can someone confirm?

I think the only difference on the gearbox case is the layshaft bores. 2.5 PI boxes have layshafts the same diameter all the way down, the stag ones are different sizes each end.

One other possibility is that because Stag boxes have roller bearing thrust washers, the gap between the thrust washer mounting faces is different, or it may be the difference is in the layshaft cluster. I know they are different thicknesses because I had a broken roller thrust washer that I could not replace, and had to use two plain washers with one ground down to produce the correct end float. It was on the small thrust washer end which I presume only gets thrust on the overrun, and seems to have worked OK

Neil