TT Industries gearbox

Joined
Aug 20, 2010
Messages
96
Country flag
Has anybody taken apart a TT Industries AMC style gearbox? If so could you please post some pictures.
Does it have a selector drum (Japanese style) instead of the AMC flat disc?
Is the gear change mechanism the same as the stock Norton gearbox?
Is the kickstart arrangement the same as the stock Norton?
I assume these parts are all beefed up as is the rest of the gearbox & no stock AMC parts are used?
Mine is a 5 speed XHD with no kickstart. I was originally going to use it on my race bike, but have now decided to put it on a street bike.
I know they make a kickstart version so hopefully I can get the relevant parts to convert it.
 

Fast Eddie

VIP MEMBER
Joined
Oct 4, 2013
Messages
12,180
Country flag
Yes e box has a drum shift mechanism. I had to take mine apart to change the drum. It’s actually very easy to work on. it’s a cassette design, so the whole cluster comes out complete with the inner cover.

mad far as I am aware, none of the internals are interchangeable with a Norton box.

I spoke to TTI about converting a race box to a kickstart box a little while ago and it was VERY expensive. You will be better off selling your box and buying a new one.

Or, keep it as is and fit an e start...!
 

SteveA

VIP MEMBER
Joined
Dec 20, 2011
Messages
1,955
Country flag
There isn't an easier box out there to work on. It is all on a cassette. I have pulled it out just for inspect several times. My box is also a 5 speed XHD race box.

This is marginally more frustrating on my Rickman because I need to get the box out of the frame to remove the cassette due to right lower frame tube. In a Commando or Seeley frame it can be left in situ, remove the primary drive, sleeve gear stays where it is and the drive sprocket/chain can be left on.

I changed the mainshaft, because the clutch thread was damaged. This job is a little more work than the drum change, but still very straightforward. Remove outer cover, unbolt inner cover, pull out cassette.....mount it in a vice and do what you need...reinsert. No gaskets, just threebond it.

The only issue I had was that the drum didn't rotate freely on first reassembly with the new mainshaft, removed drum, lightly lapped with fine grinding paste, cleaned up and replaced. Hasn't happened again on subsequent strip downs.

Unfortunately the TTi website no longer has the useful pictures of the box opened up.

But I am sure Fast Eddie is correct, go e start or sell and then buy what you want.

But, if you havent used one you really should, your race bike deserves it, the gearchange is brilliant compared to....well....pretty much anything else.
 
Joined
Jun 30, 2012
Messages
9,717
Country flag
The only difficulty in pulling the TTI box apart lies in the fact that you have to take the clutch and countershaft sprocket off, to get the cassette out. The countershaft nut is torqued-up to 90 foot-pound, so you need to lock the rear chain as you undo it with the special spanner. When I got my box from Bruce, it had the wrong selector drum, so I got the right one from him and fitted it. Foolishly I fitted the end cases with silastic instead of 3-Bond . The box leaked. So far the bike has been sitting idle for a couple of years. I just cannot get enthused enough to pull it apart again. It's an easy job - but on my bike, every thread is different- you need ten spanners and five hands.
 
Joined
Jun 30, 2012
Messages
9,717
Country flag
With a Norton box, you can take the two end covers off much more easily than with the TTI box.
 

SteveA

VIP MEMBER
Joined
Dec 20, 2011
Messages
1,955
Country flag
The only difficulty in pulling the TTI box apart lies in the fact that you have to take the clutch and countershaft sprocket off, to get the cassette out. The countershaft nut is torqued-up to 90 foot-pound, so you need to lock the rear chain as you undo it with the special spanner. When I got my box from Bruce, it had the wrong selector drum, so I got the right one from him and fitted it. Foolishly I fitted the end cases with silastic instead of 3-Bond . The box leaked. So far the bike has been sitting idle for a couple of years. I just cannot get enthused enough to pull it apart again. It's an easy job - but on my bike, every thread is different- you need ten spanners and five hands.
You need to take the clutch off, because it is mounted on the mainshaft, which needs to come out with teh cassette.

You do not need to take the 'countershaft' sprocket off because it is mounted to the sleeve gear which remains in the case! I haven't had occasion to remove the sleeve gear. It is likely that most of us never will, there are two big bearings on the sleeve gear.

But both are probably irrelevant to OP who hasn't installed the box yet!
 
Joined
Jun 30, 2012
Messages
9,717
Country flag
Thanks for that Steve. It makes me feel better about the prospect of operating on my bike. When I fitted the replacement shift drum, the gearbox was out of the bike and I had not torqued-up the countershaft sprocket. So I was not aware that top gear could stay within the box when the cassette was removed. It is only a little thing, but for me it has been a turn-off. If you have to remove the countershaft sprocket, you start mucking around with both chains. Back in the old days, this would not be an issue, but these days I am lazy. - Now I know I have to just get my head straight and get on with it.
 
Joined
May 11, 2010
Messages
2,324
Country flag
At this point do not most of us have an impact gun? I cannot imagine working on a bike without one. 90 pounds foot is childs play for one.
 
Joined
May 11, 2010
Messages
2,324
Country flag
Come on Steve, small money, just get a cheap chicom one. Makes life easy.
 
Joined
Jan 19, 2012
Messages
1,031
Country flag
Recent offerings by TTI are Triumph T120/T150 and T140/T160 5- and 6-speed gearboxes, the latter providing left-hand shifting. For some time I have lusted for a 5 speed g/b for my Mlk3 build. Has anyome queried for an AMC-Norton version providing left hand shifting? And will the casing be a direct retrofit, i.e., is the crossover shaft in the correct position?

-Knut
 

comnoz

VIP MEMBER
Joined
Dec 10, 2008
Messages
7,194
Country flag
Recent offerings by TTI are Triumph T120/T150 and T140/T160 5- and 6-speed gearboxes, the latter providing left-hand shifting. For some time I have lusted for a 5 speed g/b for my Mlk3 build. Has anyome queried for an AMC-Norton version providing left hand shifting? And will the casing be a direct retrofit, i.e., is the crossover shaft in the correct position?

-Knut
Yes, I have a heavy duty, extra wide ratio 5 speed with left hand shift. The shaft is in the correct position but it is not at an angle like the original. It still fits though.
 
Joined
Jun 30, 2012
Messages
9,717
Country flag
When I raced my 500cc Triton, I always used 4 speeds close ratio. I rode it after my friend had fitted a standard 5 speed Triumph cluster - it wasn't all bad. The four top ratios must be fairly close. But Phil Pick used to sell two pairs of gears which moved 2nd and 3rd gears up towards 4th.
 
Joined
Jun 30, 2012
Messages
9,717
Country flag
I have had the outer cover off and changed the Triumph sourced clutch actuator between practice and races on the same day!
You are quite tight. I have to get my act together. When I was younger, I would have rebuilt that box at a race meeting. The trouble is, I did that once and got a small piece of rag caught up between the cases. The oil leaked out on the way home and I did not check the oil level before the next meeting. The gears in the box became pitted. A gearbox blow-up is a certain crash.
 
Joined
Jul 8, 2011
Messages
2,668
Country flag
Running an extra heavy duty five speed with a kick start and RH shift on a Norton 1,007. You can ask TTI about pricing but I don't recall a sticker shock.
 

Fast Eddie

VIP MEMBER
Joined
Oct 4, 2013
Messages
12,180
Country flag
I don't recall a sticker shock.
You’re richer than me John (not too difficult perhaps)!

I found the sticker price quite painful, and thus put the idea off for a long time.

But I have to say that now I’m in a position whereby the pain of the purchase has passed and the pleasure of ownership persists!

I know all TTI owners say so, but it’s true, they are really nice boxes.
 

Top