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TR6 TR6 Overdrive
- Thread starter jjbunn
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TR3driver
Great Pumpkin - R.I.P
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As alluded, J-types came with varying ratios in different applications (as did A-types). Stock TR6 J-type was .80 I believe; slightly taller than the A-type used on TRs.
BTW, 28% is only .78 ... some Healeys had .78 A-types and I have a friend putting one of those in his TR3A. According to the Moss catalog, early BN1s had 32%, which is .76.
BTW, 28% is only .78 ... some Healeys had .78 A-types and I have a friend putting one of those in his TR3A. According to the Moss catalog, early BN1s had 32%, which is .76.
sail
Darth Vader
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i have been watching od talk with much interest. julian as you are in ca you may want to look at https://www.triumphsonly.com/ since they are in ca and have the complete rebuilt deal. I do not know anything about them but i like their name.
sail
Darth Vader
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TR3 through TR6 fully rebuilt Transmission WITH fully rebuilt A type Overdrive unit. $2450 with your 4 speed non OD exchange or the price drops down to $1450 with your OD transmission exchange. https://www.triumphsonly.com/pages/main/index.html this is where i found it.
don't know, i want another gear also but am not sure of frustation level as opposed to writing a check. i would expect i would not do as good a job, take forever, ok once in if i did do it right really cool but if crunch, i should have known better. i love the idea that i can stumble my way around the car and make it go and that is why no one touches it but me however .............
don't know, i want another gear also but am not sure of frustation level as opposed to writing a check. i would expect i would not do as good a job, take forever, ok once in if i did do it right really cool but if crunch, i should have known better. i love the idea that i can stumble my way around the car and make it go and that is why no one touches it but me however .............
It all depends on how comfortable you are with tearing things down. I had never even opened a transmission in my life when I took on my project. However, I had done a fair bit of wrenching, including rebuilding an engine and I am an engineer.
All that said, I started with three transmissions - TR6 non O/D, TR4 non O/D and TR3 O/D (but did not work). In the end I took the guts (all of them) from the TR3 transmission and the broken TR3 O/D and put those guts in the TR4 box and added the J type overdrive to the back of it. Before I actually added the O/D to the box I built a test jig to figure out what was wrong with the O/D on the bench.
In the end I got a 3 syncro O/D box working and in my TR4. And with never having done any tranny work in my life (other then removing and replacing clutches). So you can do it if you have the motivation. I spread the work over a few days as I got advice from this forum as things cam up (I could not have done it without you folks) and I had to go buy one part.
Before anyone asks, the reason I went with the 3 sychro guts and not the 4 was that I only had the O/D main shaft for the 3. Some day I will buy a 4 main shaft and put the 4 guts in there (and that too tells you how "simple" I ofund the whole thing to do).
All that said, I started with three transmissions - TR6 non O/D, TR4 non O/D and TR3 O/D (but did not work). In the end I took the guts (all of them) from the TR3 transmission and the broken TR3 O/D and put those guts in the TR4 box and added the J type overdrive to the back of it. Before I actually added the O/D to the box I built a test jig to figure out what was wrong with the O/D on the bench.
In the end I got a 3 syncro O/D box working and in my TR4. And with never having done any tranny work in my life (other then removing and replacing clutches). So you can do it if you have the motivation. I spread the work over a few days as I got advice from this forum as things cam up (I could not have done it without you folks) and I had to go buy one part.
Before anyone asks, the reason I went with the 3 sychro guts and not the 4 was that I only had the O/D main shaft for the 3. Some day I will buy a 4 main shaft and put the 4 guts in there (and that too tells you how "simple" I ofund the whole thing to do).