auto transmission identification.

[RollyTG]

I am needing some help figuring out what is going on with the automatic transmission in my 1965. The actual transmission unit is definitely a DG-250, but the controls on the steering column appear to be the same as on the BW Type 35 from later cars. Is this possibly the way it came out of the factory, or has it been monkeyed with? The indicator in the top half of the nacelle thing has no strip of letters in it. In the parts box for the car is a later model indicator nacelle with P, R, N, D2, D1, L on it. As the nacelle that was on the car is cracked I thought that perhaps the other one was purchased as a replacement. So I am puzzled and hope that somebody here can clarify the situation for me. Thanks.

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[cass3958]

I have the BW35 in my 1967 car and I think that the actual controls ie lever system and so on are the same throughout the ages. What I would think might change between gear boxes is the toothed piece (called the Gate positioning selector lever part number C26180) on the column. But looking at the parts book there is only one listed for all years.
Attached is a photo of my Gate marked with the positions and a photo of the markings on my Nacelle.

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Mine does look different from yours but hopefully you will be able to work out which gear matches yours from the arrows and markers on the photo.

Nacelle on 1967 S Type.JPG (1.56 MiB) Viewed 2903 times

[RollyTG]

Thanks Rob. Great pictures. My shifter column looks somewhat different to yours also; I guess maybe because yours is a later model and a right hand drive. I am waiting on a new neutral safety switch to arrive so I can reassemble the shifter, put in the new turn signal switch and get the steering wheel back on. Maybe it will all come together. Then when I get the engine running I can see it it all works.

[cass3958]

To be truthful I don't know if mine works correctly. I have P.R.N.D.2.1 on the Nacelle but in the gearbox I don't seem to have the second gear hold. I only have N.D and when I clear the gate 1 but not second hold.
My gear box although a BW35 is not the original as at some point the previous and only other owner had a catastrophic explosion in the bell housing area which punched holes in the floor and tunnel. (He had sadly died before I took ownership so was never able to get the history of the gearbox swap.) I had to close and weld these up during my rebuild. So I am not sure if my gearbox came from another model of car as the BW35 was used in a lot of British Leyland vehicles in the 1970 and 80s.

[RollyTG]

In most of the pics I have seen of 65s the transmission gear indicator goes P N D L R. That is - Park and Reverse are at opposite ends. That is the way it looks in the parts diagram also. So I am assuming that that is what I should have. At the moment I can't get the pawl to engage in the various slots properly.

I have now put in a new (NOS) neutral safety switch, correctly wired, as far as I can tell, and the starter still operates no matter what position the switch is in - very mysterious - and a little dangerous. If anybody out there could offer a clue as to what is going on here I'd certainly appreciate it.

[cass3958]

I have now put in a new (NOS) neutral safety switch, correctly wired

Where is your safety switch located as early S Types with the DG250 had them under the dash and the later cars with the BW35 had them on the side of the gearbox?

[RollyTG]

The switch is under the dash; attached to the steering column on the left side. I have detached it to check the wiring and to reattach it when I get the shift gate thing sorted. I found some instructions in the service manual that look promising. But still no idea about why the starter still works in all positions. I am thinking that the switch has been bypassed somehow by a previous owner. It sort of looks like the anti-creep and thermo-electric choke have been bypassed. Lots more mystery than I anticipated. Still it is keeping me of the streets and out of the pubs - oh! - I can't go to the pub - it's closed until further notice.

[RollyTG]

Well, the saga of trying to identify my auto transmission continues. The car is finally running - albeit not that well, but that's a minor issue - and I have been able to drive it around the block twice. The transmission shift is definitely P,R,N,D and not P,N,D,R as it should be for a DG250 transmission. And DG250 is definitely what it should be as a '65. If the transmission had been replaced by a BW35 from a later year the transmission dipstick would be on the right hand side, but it is not - it is right there alongside the oil dipstick on the exhaust side of the engine. I am bewildered. Can anybody offer any idea as to what is going on here?

[cass3958]

We discussed in http://www.jagstyperegister.com/forum_n ... =17&t=1184 the different types of gearbox which might have been in the S Type. I questioned it as mine is a BW35 on the plate but did not have the gear set that it should have. I have now ascertained it is a BW35 but from a Daimler 250V8 and as you have stated the dipstick is on the right side of the engine.
In researching my dilemma a couple of things were learnt and you are going to have to get under the car to check these out.
First what is your gearbox case made from? Alloy or cast iron? Alloy could be BW35 and beyond. BW65 or 66 from an XJ6? Cast Iron and it might be the BW model 8 from the 420.

Secondly is there an adapter plate between the bell housing and the back of the engine? This might determine if it is a Jaguar gearbox or another manufactures box with an adapter plate.

Third. Check where the dipstick filler pipe attaches to the gearbox. The top might be on the left side in the engine bay but attach to the right side on the gearbox with the filler pipe coming up over the top of the gearbox from the right to the left.

Lastly can you see the ID plate and get a photo of it. Mine is tucked up on the left side of the gearbox unfortunately above the exhaust pipes. I had to get my phone with the camera on tucked up between the pipes and the tunnel wall to take several photos before I got a clear one of the plate. The plate should tell you the make and model number of the gearbox and the serial number.
Attached are a couple of side on shots of a BW65 and a BW66 gearbox from the later XJ series but they clearly show where the I/D plates can be found. Then there is a photo of my plate showing the information you might find.

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[Glyn Ruck]

Rob. Is a BW30 & a Model 8 the same thing or were both fitted to the 420?