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Triumph TR3 - Installing a full synchro gearbox

Well, it hit 50 degrees today so that means its time to get my tr's in order.
I have an extra gearbox from my '76 tr6 and would like to install it into my '61 tr3a (TS73636). Has anyone done this? Is there any problems with the install? I do notice that the full synchro gearbox is slightly longer.
Thanks,
Mike
Mike Parkhill

It's up to a warm 20 degrees F (minus 6 C) here today. I don't know the details but the TR6 has a different rear transmission mount and you will have to get one and modify it to fit the bolt hole locations on the TR3A. If, as you say, the gearbox from the TR6 is longer, you'll need to know if your drive shaft will do or will it need to be shortened ? Or will a TR6 drive shaft fit ?

Ask the TR6 guys for their input.

Don Elliott, 1958 TR3A
Don Elliott

Don,
It is always good to hear from you. I will post the question on the tr6 page to see if anyone else has done it. I forgot about the rear mount, I guess I was only thinking about the front end. In regards to the drive shaft, there may be enough play since I only need 1/2" (I think). My guess is that the extra length comes from the additional synchro.
Mike
P.S. my tr3a is white with a red interior. Although I may lose points, I chose to paint my radiator shroud black. I tried white first, it didn,t look good. So I did black.
Mike Parkhill

Mike-I think all of the drive shafts (TR2-6) are the same length (at least Moss lists the same part no.). The siding spline will accomodate the difference in trans length. If you could swap for a 72 or earlier, the mounts are the same as the TR3, but would have to altered slightly for the extra 1". The only other issue is swapping the release bearing and the snout because of the different clutch types. Since your TR3 has the later starter, it should work with the TR6 trans. Did I miss something?
Berry

Mike - Why don't you call the tech guy at Roadster Factory after 12 noon tomorrow and chat it over with him. Maybe he can help.

Don Elliott, 1958 TR3A
Don Elliott

Don,
spoke with Dave at the Roadster Factory, says it is an easy swap. Need to change the throwout bearing and sleeve. Also, the rear mount has to be modified slightly. Guess I have a project to work on.
Mike
Mike Parkhill

This thread was discussed between 10/03/2003 and 12/03/2003

Triumph TR3 index

This thread is from the archive. The Live Triumph TR3 BBS is active now.