[Fot] TR4 transmission

[Bob Kramer]

This email is a keeper. Nice job!.  I would add that for those of use that
have the spare later TR6 trannies to work with, the Dolomite gear sets are
a bargain priced solution.  I built one for the Ex-Lemons/Chump Beanito's
TR6  with a J-type overdrive that everyone loved at COTA.

Bob Kramer


On Tue, Jun 18, 2019 at 9:25 AM Robert Lang via Fot <fot at autox.team.net>
wrote:

> Hi,
>
> Those are THE questions, aren't they?
>
> Okay - Quaife has a straight-cut gear set that uses dog-rings, no
> synchros. Big $$$, 1600 UK pounds. Quaife just ran off a set and the one
> source that I know of in the UK can get them:
>
> Dennis Vessey - Quaife gear kits for Triumph TRs
> <http://www.vessey-classic-car-services.co.uk/triumph-gear-kit.htm#.XQjuu3t7n64>
>
> Dennis Vessey - Quaife gear kits for Triumph TRs
>
> metatags generator
>
> Vesseys Triumph TR Dog-Engagement Gear Kit - developed with Quaife
>
> <http://www.vessey-classic-car-services.co.uk/triumph-gear-kit.htm#.XQjuu3t7n64>
>
>
>
> Note, if you decide to go that route, please contact me, I've been in
> contact with the vendor and I'm trying to place an order for this gearset.
> Maybe we can save some shipping if we get a couple of sets.
>
> Note too that Bastuck has dog box gear sets including one using the J-type
> overdrive. When I contacted them last fall, they had none in stock and
> there was no production scheduled.
>
> Failing that option, there's the "Dolomite Close Ratio Gearset". This
> consists of a different input shaft and main 3rd gear along with the
> corresponding layshaft gears. You need to work the case to get these to
> pit, but they work great. These are helical gears. I've used this setup for
> around 20 years, and it is really really good. Note: for the best total
> gear ratio option, get a later TR6 gearbox with the 16-tooth 1st laygear.
>
> Now, the drawback to the helical gears is apparently excessive thrust
> forces and they effect the layshaft thrust washers as well as the layshaft
> needle bearings. If you make torque and you have any end float for the
> layshaft, you will spin the thrust washers and wreck the case. There are
> some workarounds to compensate for excessive end float.
>
> Note too that because of torque multiplication, the layshaft needle
> bearings on the 1st gear end of the layshaft get beat really, really hard.
> One fix is to install a double bearing on the layshaft (or buy a new one
> from Moss or another source) that is set up for the double bearing. I've
> had Quantum Mechanics install the double bearings, they seem to work better
> than the stock setup. But even with that setup, the layshaft still gets
> pounded and you need to keep an eye on it.
>
> As you may know, a lot of the racers are gravitating away from the stock
> and/or modified Triumph gearboxes mostly because the quality consistency of
> replacement parts is all over the place and you need to know what you're
> getting to spot the differences. That said, frequent oil changes and paying
> attention to the detritus in the oil, you can stay ahead of problems.
>
> If you're going to build a good gearbox, it will cost you as much or more
> than some of the conversions out there, hence a lot of folks switch to
> Toyota/T5/Rocket, etc.
>
> Hopefully you'll get other good advice on this list, but that's where I'm
> at right now (too). The Quaife gearset in the TR gearbox seems like the
> most "vintage" solution, but ALL of the options have pluses and minuses. In
> the spirit of full transparency, I'm also looking at Super T10
> transmissions which are the same as the old Muncie "Rock Crusher" and there
> is a gearset available with a 2.43 1st, 1.63 2nd, 1.23 3rd and 1 4th which
> is pretty close to the Dolomite Sprint setup. And the gearbox is 70 pounds
> which is really close to the stock box. Also, if you want to dish out more
> $$$, Gear Vendors has an overdrive that bolts to the T-10, I haven't
> researched that enough to see if there are any particulars, but it is an
> option, albeit around $3k. But you get a BRAND NEW overdrive. Just sayin. A
> drawback to the Super T10 is that you will need to make or source a bell
> housing, but that is do-able with a combo of a trashed TR gearbox, a
> competent machinist and more $$$. ;-)
>
> Regards,
> Bob Lang
> 339-927-4489
>
> On Tuesday, June 18, 2019, 9:02:31 AM EDT, Mike Deweerd via Fot <
> fot at autox.team.net> wrote:
>
>
> Amici
> What is the preferred gearbox for the TR4 non overdrive and where is the
> best source for getting such
> I’m looking at the pros and cons of the straight cut gear set vs the close
> ratio gear set (I’m assuming the close ratio is still helical gears)
> Please chime in with preferences and opinions
> Cheers
> Mike Deweerd #77
>
>
>
> Sent from my iPhone
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