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Gearbox number


Pete GT6
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You need to get the actual stamped number. It is on the flat machined horizontal face, at the front  corner next to where the drivers knee would be. On a GT6 it would be KC or KE prefix dependig or marque.

 

If your car originally had overdrive, it would have O (as opposed to 0, zero) as a suffix on the commission number. And the diff ratio would be 3.89 (KD prefix) 

 

Non od cars had 3.27 diff prefix KC. Stamped on the underside of the diff.

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Haynes probably did a typo when copying the wsm.

 

3.89+od gives the same revs as 3.27 (no od)

 

My vitesse ran 3.27 plus of until I broke the 3rd diff. Swapped to 3.63 and job done. That diff then did a few years in my zetec spit prior to the move to a Scooby diff...

 

Sorry for thread drift.

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Haynes probably did a typo when copying the wsm.

 

3.89+od gives the same revs as 3.27 (no od)

 

My vitesse ran 3.27 plus of until I broke the 3rd diff. Swapped to 3.63 and job done. That diff then did a few years in my zetec spit prior to the move to a Scooby diff...

 

Sorry for thread drift.

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I had a 3.63:1 Spitfire diff in my GT6 with overdrive, I removed it after a very short while and went back to the original non-overdrive version which gives a nice relaxed drive at speed but average acceleration. I'm not a boy racer so getting away from the traffic lights doesn't worry me in the slightest.

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Found another Haynes manual, date on front page 1987 page 132 .

Vitesse 2L and GT6 with overdrive 3.89

GT6 3.27

So corrected at some point.

 

Just been looking in a Haynes manual for Dolomite 1500 for information on J type overdrive.

Lists one rear axle ratio as 3.89 but

Early 3 rail gearbox 4th 1:1 overall ratio 3.89:1

Later single rail box 4th 1:1 overall ratio 3.90:1

???????????????????????????

 

Regards

 

Paul

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Even the genuine Triumph wsm have a few odd misprints

if you got the orig dawings/blueprints there will be odd parts that never got corrected

 

On Trucks we had a TSA temporary substitution authority tied in to the engineering design signed off by all parties to allow deviations without altering the base drawings or design if needs must .

used to correct simple errors or supply problems , keeping the lines running and solving quality problems

all logged and recorded but often did not change the base engineering drawings or data which would need a part number suffix adding.

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