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Triumph gearboxes

We haven't had a thread about Triumph gearboxes for a few weeks, so here's one.

Anybody know if the Dolomite Sprint shared gearboxes with the Stag? Sound unlikely, I know, but I've just been comparing two side by side and the only difference I can see is the input shaft, which is longer and thinner on the Sprint. The clutch slave cylinders are on different sides, but as the actuating rod is the same, they can be moved to whichever side you want. Otherwise, everything looks the same, even down to the J-type overdrive.

I'm not talking about the standard Dolomite, which had a totally different gearbox.

I'm interested because I've just sold a Stag 'box on eBay and have been contacted by someone in the States who's desperate for some parts for one. I don't have another Stag 'box but have just bought 3 Sprint 'boxes for the grand total of 11p! (One has an engine attached, but I don't think that's up to much.)

Reply to
Willy Eckerslyke
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The box is the same as the 2500 also its in the adapter ring between the engine and the GBox.

Reply to
Rob

That's good to know. Thanks Rob. So presumably it could also be persuaded to fit a Vitesse engine (though may be a bit bulky to fit between the chassis rails of the actual car). Looks like I may be getting some good value from my 11p!

Reply to
Willy Eckerslyke

I've been told that the Stag and 2500 boxes, whilst appearing identical, are different internally. Something about heavier bearings, but I don't know for sure as I've never had cause to take either apart. Badger.

Reply to
Badger

It wouldn't have been different synchro rings, would it? I know that Triumph beefed up the ones in the Vitesse/GT6 box during production, so perhaps they did the same with other gearboxes too.

When I have a minute, I'll pull the dodgiest looking Sprint 'box apart to see what's what.

Reply to
Willy Eckerslyke

I have no information on Sprint or Stag gearboxes, but I have had a quick look in the Stanpart Parts List for MkII 2000 and 2.5PI and there are only a few differences. A different front oil seal, and a different

3rd gear retaining washer seem to be dependent on whether it is 2000 or 2.5. Then there are different mainshafts, depending on whether there is no overdrive, a Type J overdrive or a Type A overdrive fitted. And there appears to be an alternative input shaft used in different (unspecified) gearbox numbers. I don't mind scanning the pages and e-mailing them if you want them. They will tell you the part numbers and show you the exploded diagrams.

Jim

Reply to
Jim Warren

Bearing are the same.

Reply to
Rob

yep

And there

The clutch plate splines are different.

Reply to
Rob

I'm OK on that one, the Sprint had a J-type, the same as the Stag 'box I've just sold. One thing though, the label on the Sprint overdrive has orange writing. I may be mixing it up with something else, but seem to remember hearing that the colour coding means something or other...

That's the bit I'd spotted. The Sprint input shaft is a long, thin one with a much narrower splined area for a different clutch plate (as Rob points out).

Thanks Jim, that would be extremely useful. Take your time, I've a load of things to finish before starting to strip one of the 'boxes down. oss108 (at) bangor.ac.uk will get to me.

Reply to
Willy Eckerslyke

It probably won't be today because I have got a lot of other things to do, but I should get the scans to you by the weekend.

Jim

Reply to
Jim Warren

Sent this afternoon, Willy If they don't turn up in your mailbox, let me know, and I will try another method of getting them to you.

Jim

Reply to
Jim Warren

They've arrived and very useful they look too. Thanks ever so much Jim!

Reply to
Willy Eckerslyke

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