[Fot] TR4 transmission

Tue Jun 18 10:19:28 MDT 2019

Nice summary!  I don't have much to add other than the Quaife gearset 
uses substantial needle bearings inside each of the gears, much larger 
input to mainshaft needle bearing, steel thrust washers within the 
stack.  Work of art.  Layshaft still uses semi-stock bearings.

When I blew up my tranny I ended up going with the Quaife and really 
like it.  No synchros to break, shifts are lightning quick, gear ratios 
work well.

Cheers, Tony Drews

On 6/18/2019 9:24 AM, Robert Lang via Fot 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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