Stupid but doable: push button TH400
#1
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Hey guys,
So, I won't be doing this but thought it would be interesting....
The 3 speed automatic in our V12 cars is the common TH400. The same TH400 used in certain Rolls Royce models. Even the bell housing is the same (Rolls uses an adaptor plate to fit the Jaguar TH400 to their V8s).
A friend showed me his spare TH400, as I was considering it for my V12 and I noticed that it has an electronic actuator on the rear, next to the rear tail housing, which only controls the selector arm. So in theory, the Rolls selector, commonly on the steering column, isn't connected to the tansmission like in our cars. Instead, it is a switch.
That means, it would be possible to remove the sometimes faulty and troublesome selector with solenoids etc., and install a push button transmission control, like many modern cars have again. P, R, N, D, 2, 1 all as a row of small buttons. Like that it would be possible to free up the center console. Maybe making for a proper flat ski slope...
I won't be doing this, but I would love to...
So, I won't be doing this but thought it would be interesting....
The 3 speed automatic in our V12 cars is the common TH400. The same TH400 used in certain Rolls Royce models. Even the bell housing is the same (Rolls uses an adaptor plate to fit the Jaguar TH400 to their V8s).
A friend showed me his spare TH400, as I was considering it for my V12 and I noticed that it has an electronic actuator on the rear, next to the rear tail housing, which only controls the selector arm. So in theory, the Rolls selector, commonly on the steering column, isn't connected to the tansmission like in our cars. Instead, it is a switch.
That means, it would be possible to remove the sometimes faulty and troublesome selector with solenoids etc., and install a push button transmission control, like many modern cars have again. P, R, N, D, 2, 1 all as a row of small buttons. Like that it would be possible to free up the center console. Maybe making for a proper flat ski slope...
I won't be doing this, but I would love to...
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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#4
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I still have so far to go with my, Lady...
But usually, I want to hear MORE about everything I read here.
Like THIS ^^^^^
And, the stuff I am reading farther down into the "header" tread that is in the works today - about exhaust. So much to learn here.
Thanks to all of you!
But usually, I want to hear MORE about everything I read here.
Like THIS ^^^^^
And, the stuff I am reading farther down into the "header" tread that is in the works today - about exhaust. So much to learn here.
Thanks to all of you!
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#6
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The dangerous thing about the Silver Shadow type selector is that it requires that the battery is charged and attached.
I remember an incident at the local Jaguar/Rolls Royce dealer back in the early 1970s when a flat-bed wrecker delivered a Silver Shadow to the service dept.
The truck lined up the Rolls with the service entry overhead doorway, disconnected the holdown chains and tilted the bed to allow the car to roll into the shop.
The battery was flat and the 'Shadow' would not disengage PARK even though the selector was in NEUTRAL.
The towtruck driver hooked up some jumpers to the battery and the gearbox selector motor moved to NEUTRAL!!!!!!!!
The Silver Shadow was now free to roll into the shop with nobody in the car. The Driver's door was opened and got torn off it's hinges on it's way into the shop.
The towtruck driver was screaming that it was NOT his responsibility but technically it was still on his truck when the door was torn off.
$8,000.00 later, the car was fixed at the body shop.
Be sure you understand how the system works. It can be both good and bad.
bob
I remember an incident at the local Jaguar/Rolls Royce dealer back in the early 1970s when a flat-bed wrecker delivered a Silver Shadow to the service dept.
The truck lined up the Rolls with the service entry overhead doorway, disconnected the holdown chains and tilted the bed to allow the car to roll into the shop.
The battery was flat and the 'Shadow' would not disengage PARK even though the selector was in NEUTRAL.
The towtruck driver hooked up some jumpers to the battery and the gearbox selector motor moved to NEUTRAL!!!!!!!!
The Silver Shadow was now free to roll into the shop with nobody in the car. The Driver's door was opened and got torn off it's hinges on it's way into the shop.
The towtruck driver was screaming that it was NOT his responsibility but technically it was still on his truck when the door was torn off.
$8,000.00 later, the car was fixed at the body shop.
Be sure you understand how the system works. It can be both good and bad.
bob
#7
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I was just jabbering with a guy from this company,,, he sent me this info... Dang expensive, these things are...
https://www.powertraincontrolsolutio...utton_Shifter/
https://www.powertraincontrolsolutio...utton_Shifter/
Last edited by JayJagJay; 07-25-2019 at 05:25 PM.
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Some Day, Some Day (07-26-2019)
#10
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#11
#15
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I think you misunderstood. I didn't mean that RR had floor-mounted shifters, just that they had (as noted earlier in the thread) ones that operated electrically, rather than mechanically. Daim was thinking about using push-buttons, but I agree with Spikepaga: rotary gear selectors? Push buttons? Odd. Wrong. So keep the slim, elegant T-shifter, just make it use the same effortless electrical switching the Roller has. Before I got my XJS, I had imagined that such a thin shifter would merely need a gentle nudge to move between gears--turns out it's quite physical. Of course, you'd need a way to prevent a stray brush from your arm as you adjusted the climate control to suddenly put you into neutral or second gear....
Last edited by Some Day, Some Day; 07-26-2019 at 08:56 PM.
#16
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I think they are saying the column shifter on the RR is an electronic actuating device, not a cable-operated actuating device as in the XJS. Presuming my understanding is correct, the two, of course, still push or pull the same mechanical lever on the GM400.
#17
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Before I got my XJS, I had imagined that such a thin shifter would merely need a gentle nudge to move between gears--turns out it's quite physical. Of course, you'd need a way to prevent a stray brush from your arm as you adjusted the climate control to suddenly put you into neutral or second gear....
#18
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Exactly that. The XJ-S uses a cable. The Rolls Royce uses an actuator which is bolted to the rear of the tranny.
#19
#20
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I'm learning here. To me, it seems that if the correct actuator was found, could be easily mounted to the TH400 and that could be paired with an e-shifter that was smart and fit the interior of the xjs,,, it would be awesome. I agree with another writer about the preference of manually shifting the lever into gear,,, but at the same time, in mine, I've imagined a shorter shifter and a situation that was the same or similar to my xjs. I think it could be nice.
I just have not been able to find a product. Over $1000 (the example in the link above) will just not do,,, and (sorry) it's kinda ugly...
I just have not been able to find a product. Over $1000 (the example in the link above) will just not do,,, and (sorry) it's kinda ugly...