THE INTERNATIONAL JAGUAR 'S'-TYPE REGISTER FORUM

It seems that the Model 8 was also used in the 2+2 E-type at some point. And I just happen to have an original E-type service manual (that my wife found at a book sale for $10) that has all the required information. So that's a big plus.

RollyTG wrote: ↑Fri Feb 19, 2021 6:57 pm My transmission case is iron not aluminium. So it looks like I might have a Model 8. I hope it's a good one.

Yep possibly a Model 8 then from the 420 if it has an iron case but the same gear set up as the BW35. The Model 8 was not fitted originally to the S Type but was around in the 420 and the 420G Jaguar line up from around 1965/66. It withstood a higher torque than the BW35 which is why it was fitted to the 4.2 engined cars. It is an older gearbox than the BW35 having been first used in some American monsters in the late 50s. In 1969 the new XJ6 also used the Model 8 but they moved to the BW model 12 gearbox in 1970.

If your car does in fact have a BW35 gearbox the switch on this Ebay UK listing probably would work. See item number 372649298864

And here's another one: 323375241040

My transmission case is iron not aluminium. So it looks like I might have a Model 8. I hope it's a good one.

just to clarify, from reading your info again - the DG250 box that I should have but clearly don't, would be a cast iron casing; if it is a BW35, it would be an aluminium casing, and if it is a Type 8 (maybe from a 420), it would again be cast iron, and have a P, R, N, D1, D2, L shift pattern - have I got that right?

Yep that is right Rolley and as Glyn has stated no 1965 S type should have a BW35 as they did not come in until 1967 and no S type was fitted with the Model 8 but if your gearbox like mine was damage and replaced God knows what you might have. As I found out only recently my gearbox is a BW35 but from a Daimler as my gearbox does not have the 2nd gear start mode only Drive and 1st gear hold even though on my Nacelle I have 2nd gear nothing happens when you select it.

It would clearly seem that this car does not have it's original transmission. No 1965 car had a BW 35 or Model 8.

Rob - Thanks for all your research on this. When I got my car it had the transmission indicator nacelle piece on it but it has no letters at all. When I took that off I found that all of the indicator parts are missing, so that when you move the shift lever nothing happens in the gear indicator part. The parts box contained a nacelle with P, R, N, D1, D2, L. So, just to clarify, from reading your info again - the DG250 box that I should have but clearly don't, would be a cast iron casing; if it is a BW35, it would be an aluminium casing, and if it is a Type 8 (maybe from a 420), it would again be cast iron, and have a P, R, N, D1, D2, L shift pattern - have I got that right? I hope to check it out again tomorrow with my pick-up magnet.

Rob, You & Orlando are the Auto specialists on this forum as fitted to S Types.

All I have is the BW Model 35 Manual. It is a better copy than this that I can send to your e mail if required. It's 21.3 MB so I cant upload it here.

http://www.kirks-auto.com/MGC/BW_35_manual.pdf

Reading up a bit more this morning on the BW35 but can find no information on the DG250 other than it was a Borg Warner unit.

It appears there were three versions on the BW35 box. The first version the M35 had the P.R.N.D1.D2.L quadrant then in 1965 they introduced the M36 which had P.R.N.D.2.1 and had the facility to add an oil cooler which My car has via the bottom of the radiator. The BW35 was not used on the S Type until 1967.

Then in 1967 they brought out the M37 which had a higher torque rating and used the same quadrant as the M36.

Unfortunately I cannot find any information as to which box model was fitted to the Jaguar S Type under the guise of the BW35.

So my photos above show the quadrant for the DG250 box as P.N.D.L.R then the P.R.N.D1.D2.L refers to the BW35 model M35 box and finally the P.R.N.D.2.1. quadrant refers to the BW35 model M36 and M37 gearboxes which is the one I have in my car. I do not know if I have a 36 or 37 being late 1967 as there is nothing on the I/D plate to indicate either and mine has been changed out to a Daimler gearbox anyway prior to my purchase.

To complicate matters further the P.R.N.D1.D2.L quadrant was also used on the Jaguar 420 and this was fitted with the Borg Warner Model 8 gearbox so if you check under your car and find you have a cast iron gearbox casing with the P.R.N.D1.D2.L gear selection you might have the Model 8 from the 420 fitted as a replacement but this was never fitted to the S Type as standard as far as we can determine. Checking the I/D plate will confirm this.

Well if it is in fact a BW35 with the switch on the side of the gearbox I would think this must be available from somewhere. Seems to me the BW35 was a common unit used on many Volvos, Triumph Stag, Austin/Morris Marina, MGC, Datsun 510, etc. Checking suppliers for those cars might turn one up assuming they are the same for different brands of cars but all had a starter inhibitor function and a reverse lamp function and as I recall all were P-R-N-D-2-1 shift pattern.