• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

TR4/4A Automatic transmission in a TR4 A

Share this page

D

DBeliveau

Freshman Member
Country flag
Offline
I know this is considered blasphemy in our world, but a friend of mine has a TR4 A but due to leg problems can no longer depress the clutch pedal. So I was wondering if the automatic transmission from the Stag could be used in the TR4 A. Also whether anyone out there has done this?
Thanks,
Dan
 
I will start off the replies with....I do not think that the Stag has the same bell housing....Transplant a Triumph saloon 6Cyl engine and transmission [would require some fabrication at front of chassis, engine mounts etc]...The saloon bell housing is the same as the TR4, so maybe the BW35 transmission could be adapted.
The easiest option would be to convert the existing manual gearbox into a "semi automatic" by way of an electronic servo operated clutch.
 
The memory was strong enough that I was sure I had read it somewhere so went looking...

It was a 1990 TRSC article reprinted in Volume 2 of TRSC's Technical Talk.

A transmission from a Triumph 2000 was used (Borg Warner model 35). Some modifications were needed of course, but the bell housing seems to have been compatible.

Dan - if you want a copy of the article PM me your email address. It isn't great detail (only 3 pages) but does highlight what had to be done.
 
Okay - simpler to post it for all to see. Note this may be copyrighted material though it is from 30 years ago and a club that may have merged into something else along the way. I'll delete if anyone sees a problem.

TR6 Auto 1.JPG
TR6 Auto 2.JPG
TR6 Auto 3.JPG
TR6 Auto 4.JPG
 
malbaby said:
I will start off the replies with....I do not think that the Stag has the same bell housing....Transplant a Triumph saloon 6Cyl engine and transmission [would require some fabrication at front of chassis, engine mounts etc]...The saloon bell housing is the same as the TR4, so maybe the BW35 transmission could be adapted.
The easiest option would be to convert the existing manual gearbox into a "semi automatic" by way of an electronic servo operated clutch.
Click to expand...
Having further thought about my last comment......it would not be the "easiest" option, as there would have to be a controlled release rate.
 
I have been looking at it to add to my son's VW GTI, he had an accident and can no longer use a leg operated clutch, just cannot find much info here in the states.
 
RGK said:
I have been looking at it to add to my son's VW GTI, he had an accident and can no longer use a leg operated clutch, just cannot find much info here in the states.
Click to expand...
If you were able to get one installed it would be interesting to hear how well it works.
 
I have been trying to locate someone that has one installed for their experience, somehow I think you would be limited by the electronics unless the clutch stays in as long as you hold the button. I will definitely post if I find more useful information. I have also been thinking of putting in a VW tiptronic, but they are known for problems, the GTI is a 2003, but has the advantage of being able to get rid of the clutch pedal for more room.
 
wondering if a period correct BW unit or whatever they used in the Automatic Sunbeam Alpine may be adapted to fit
 
Heres the car that Steve build for his dad and then my dad bought it awhile back.i will look for pictures of the trannie borg warner automatic
Philstr6
 

Attachments

  • 20220204_133814.jpg
    20220204_133814.jpg
    3.7 MB · Views: 127
  • 20220204_133738.jpg
    20220204_133738.jpg
    3.7 MB · Views: 118
Back
Top