• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

TR2/3/3A Speedometer cable fittings?

Share this page

K

karls59tr

Obi Wan
Bronze
Country flag
Offline
Anyone know if a 4A speedometer cable could be used on a TR6 gearbox? Also...would a 4A cable mate up to the back of a TR3 speedo gauge. I guess I'm asking if the knurled connectors at the gearbox have the same thread. The speedometer connection on my TR6 box (which is in a TR3)has the threads stripped out and I wonder if I can use a 4A speedo cable instead?
Is it difficult to remove the speedometer carrier once the hold down bolt is removed?
 
I do know that the TR3, 4 & 6 trannies are interchangeable in the cars. As far as the cable goes there is no reason except for length that it should not work. I am thinking that there may be a length issue with a TR6 tranny in a TR6. But I do not believe that is what you are trying to do --right? You are looking at a TR6 tranny in a TR3. So it should work.
Charley
 
Last edited:
Getting the carrier out without damage can be kind of a pain. But since you apparently have to replace it anyway, that shouldn't be an issue.

The threads will mate up, but the 4A cable will be too short unless you are also using the right angle drive from the TR6. Also, a late TR6 box will have the wrong drive ratio. I forget the change point offhand, 73 or 74 I think (same time they switched to using a J-type OD but the ratio problem applies even without the OD).
 
TR3driver said:
Getting the carrier out without damage can be kind of a pain. But since you apparently have to replace it anyway, that shouldn't be an issue.

The threads will mate up, but the 4A cable will be too short unless you are also using the right angle drive from the TR6. Also, a late TR6 box will have the wrong drive ratio. I forget the change point offhand, 73 or 74 I think (same time they switched to using a J-type OD but the ratio problem applies even without the OD).
Click to expand...

Randall,
Does the ratio problem exist with the TR6 A type OD tranny on a TR3?
Charley
 
charleyf said:
Does the ratio problem exist with the TR6 A type OD tranny on a TR3?
Click to expand...
No. Just the late TR6, that would have taken a J-type. (With or without the actual OD.)

Lots of TR6 owners find out the hard way, when swapping non-OD transmissions around.
 
Back
Top