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  • 5 speed conversion or overdive

    doing my homework to help make a decision on my trans upgrade. thought long and hrd about a rebuilt J type overdrive. but the HVDA 5 speed makes too much sense.
    About the same price but weighs far less.and possibly more depemndable. Thoughts anyone

  • #2
    I went with the 5 speed for the dependability, lack of leaks and robust construction. Ease of servicing and parts were another thought. This was 8 years ago. Today, those 5 speed transmissions are getting harder to come by. Also if you're a numbers kinda guy, then the 5 speed is not for you. I would rather see a 6 speed kit brought out. Then again, I am not a concours guy and enjoy the drive after the car is done and built.

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    • #3
      A 6 speed kit sounds like a fabulous idea, but is anyone out there working on this? What would be the ideal core for fitment?

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      • #4
        i have a nice car and enjoy longer than normal drives so the 5 speed may be my best fit. I plan my trip off the Hwy because i don't want to run at high rpms

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        • #5
          I have no idea how it would fit in aTR, but i recently looked at a very well done Tremec 6 speed conversion in an S1 E-Type.

          BTW, I have overdrive in my TR, and I’m satisfied with it for the time being. I only use it on interstates, and only in 4th, so it’s a virtual five speed.
          SR
          73 TR6. HT/AC/OD
          86 930
          91 535i

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          • #6
            In the past, I drove a 5-speed '91 MX5 for nearly 8 years, then a 2000 MX5 with an Aisin 6-speed for 18 years.

            I really disliked the 6-speed, and regularly skipped gears on the upshift- there was just no point to going through 6 gears. The 6-speed was designed for racing, not piddling around.

            The 5-speed was perfect for around town and touring long distance. And, it got better fuel economy. 30MPG vs 28MPG
            Last edited by SapphireBlue72; 11-05-2018, 06:45 PM.
            Walt
            CC80954U '72 TR6 original condition/sold 16.500.
            poolboy rebuilt the Z-S Carbs. Philstr6 rebuilt both rear hubs.

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            • #7
              The 5-speed Toyota box is a very good unit for the TR6 - great shift action, quiet, leak-free, and 50lbs lighter than an OD box. I love the unit in mine.

              But with the comparatively narrow power-band for the long-stroke 6, I have wondered if it would be even better with a close-ratio 6-speed. Some time ago I did some research, and found that a 6-speed from the Toyota/Subaru BRZ coupe was pretty close size-wise to the W58, and in fact I had a couple of conversations with Herman about that - he was intrigued, and we agreed to explore that as an option as W58 supplies dry up. I even found a transmission at a breakers yard in TN, and was going to buy it, until I learned of his passing.

              That Subaru box actually has a direct 5th, with only 6th being over-driven. So the first five ratios could span the power band of the TR6 engine, with 1st thru 4th being lower than the W58. This would mean you could use a 3.45:1 final drive ratio (either PI spec, or a Nissan R200), and not lose anything on low end acceleration vs the 3.69:1 stock ratio, yet have a really long-legged TR6 for cruising...

              Maybe someday, when I'm not so busy with work, I may take that concept forward....
              Keith, Huntsville AL, 1971 CC66559
              10.0:1 CR gasflowed head | Weber DCOEs | CP "150hp" Cam | Distibutor by Advanced | Lightened flywheel | Phoenix SS Exhaust System | HVDA 5-Speed | Good Parts suspension and anti-roll bars | Konig Rewinds | Boyd 15 gal tank | Miata Seats and Mr Mikes covers | Carl Visser dash | Mohair hood

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              • #8
                Originally posted by JBJ358 View Post
                doing my homework to help make a decision on my trans upgrade. thought long and hrd about a rebuilt J type overdrive. but the HVDA 5 speed makes too much sense.
                About the same price but weighs far less.and possibly more depemndable. Thoughts anyone
                IF... I would've purchased the OD gearbox when buying the car new in late 1973, (when the national speed limit was on the books at 55mph) I would no doubt continued to fix as needed till I couldn't. When Herman introduced the Toyota conversion in the early 2000 I was intrigued enough to stay in contact with him about some possible improvements. Being the kind of guy he is/was, he listened. Even made a few of them. That was now 15 years ago and I'm happy that I went this direction. Many of the hurdles presented with the original TR6 slave cylinder, singing or sticking throwout bearing, fork pin and its shaft have been resolved, or at least de-mystified, yet it's nice to know this area no longer exists with the hydraulic clutch system used with the HDVA conversion. Are there some potential problems with this? Probably. But looks like Moss Motors stepped up to keep spare parts available. Possibly even bring Tilton Engineering into the picture?

                Dick

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                • #9
                  Originally posted by A Brit in Bama View Post
                  The 5-speed Toyota box is a very good unit for the TR6 - great shift action, quiet, leak-free, and 50 lbs lighter than an OD box. I love the unit in mine.....
                  I'm sure the conversion is quite nice, but whenever I start thinking about it, I recall GLarsen's dead-on characterization of his preference (in another "5-speed vs. OD" thread from Feb. 2017): "I'm one of those who could never put a modern transmission [in] my TR; that "bolt action" feel when you shift gears is part of the charm. It's like you reaching into the box and shifting the gear with your hand as you can feel everything that's going on. It's noisy, it leaks oil and the OD's electrics are a bit wonky ....... and I wouldn't have it any other way really...."

                  Warren
                  1972 TR6, CC83395U, Sienna Brown / New Tan.
                  2d owner; purchased in 1974; daily driver until 1980.
                  Original US dealer: Continental Motors, Inc., Wichita, KS.
                  Original sale to 1st owner occurred Oct. 16, 1972.

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                  • #10
                    +1. Japonizing these cars in my opinion takes the charm away. They may be less reliable although I have never had problems with mine but I bought a TR6 because I wanted how a TR6 drove and sounded and with my A-Type I have 7 forward gears. They were quite nice on the Dragon and Hellbender this year, specially 2nd OD. JMHO.

                    Originally posted by wbwood View Post

                    I'm sure the conversion is quite nice, but whenever I start thinking about it, I recall GLarsen's dead-on characterization of his preference (in another "5-speed vs. OD" thread from Feb. 2017): "I'm one of those who could never put a modern transmission [in] my TR; that "bolt action" feel when you shift gears is part of the charm. It's like you reaching into the box and shifting the gear with your hand as you can feel everything that's going on. It's noisy, it leaks oil and the OD's electrics are a bit wonky ....... and I wouldn't have it any other way really...."

                    Warren
                    72 Pimento w/overdrive

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                    • #11
                      As an aside, my other car has 325 rwhp. It just has a four speed, and I’ve never felt like it needed a five speed. On the Dyno it topped out at 190 mph at redline in 4th!
                      SR
                      73 TR6. HT/AC/OD
                      86 930
                      91 535i

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                      • #12
                        As ever... horses for courses..
                        I have a 6 speed on my turbo diesel eurobox and it makes sense. The power band is REALLY narrow so you need to change gears all the time to get the most our of it..
                        The Triumph box has a certain charm and in J type overdrive form has more gears than I know what to do with.. mind you they are not all in the right order!
                        Do like the novelty of flicking a switch to change gear (never had a flappy paddle modern gearbox), something that works really well between 3rd and OD3rd on some roads. Had wondered about a longer OD as I feel I am still reving too fast at UK motorway speeds but this may be because I used to modern loping diesels that cruise at 70 MPH and 2300 rpm, my TR is more like 2900rpm. Also have the benefit of a supercharger.
                        Have considered a modern 5 speed conversion for increased ruggedness but don't think it would be the same..
                        Cheers
                        Tim

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                        • #13
                          I think that if I wanted to drive a 21st Century car, I would not have spent money for a TR6. I believe that I really do understand why others do as they do, but I really love my car just as it left Canley.

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                          • #14
                            Originally posted by JBJ358 View Post
                            doing my homework to help make a decision on my trans upgrade. thought long and hrd about a rebuilt J type overdrive. but the HVDA 5 speed makes too much sense.
                            About the same price but weighs far less.and possibly more depemndable. Thoughts anyone
                            Just more FYI - I don't know anything about it, but RevingtonTR also sells a kit for a Ford transmission conversion.

                            Comment


                            • #15
                              I am investing heavily in adding a A-type OD to my '75.

                              Having had an OD in a TR before... the A-type is really like having a 6 speed close ratio transmission. Much fun.
                              Plus with the TR transmission you can customize with a short shifter: AKA the short shift lever from the TR3. That is not going to work the same on the W58.

                              I am going to find something out: is it possible that the real reason these transmissions leak is old seals? Or are they inherent leakers by design?

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                              5 speed conversion or overdive

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