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Transmissions Woes

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hondo402000

hondo402000

Darth Vader
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Well I thought I should start a new thread,
after rethreading the output shaft on my TR6 transmission, one of the rear top cover bolts was stripped, so bought a longer one to grab the good threads that were left that worked but I decided to really inspect the gears too. first thing I noticed was a crack in the aluminun casing at the rear of the housing on the top machined surface where the top shift cover goes, umm so further inspection I notice the large gear toward the rear has some huge chips in the teeth, still cant figure out what gear it is, 4? also the reverse gear has some chips on the teeth too. So called Quantan mechanics ,talked to John, shipping my tranny out in a few days, and getting and going for the gusto and get a overdrive transmission. what another 3 grand

Hondo

again its not always the DPO that screws things up how about the DUM thats Dreaded useless Mechanic
 
Ouch! Oh well, better to discover it now rather than later. I thought you might be in trouble when you started describing the output shaft ... went through the same thing myself a few years ago with a Stag OD gearbox from eBay. It had not been described as "rebuilt", but the gorillas had been at work.

With the top cover off, that big gear in the back is 1st gear. The next gear-like thing is actually the 1-2 shift hub, which also has gear teeth for reverse to engage with.

4th gear doesn't really have any "gears" at all. Since it is straight-through (1:1), the 3-4 shift hub just slides forward to engage with the dog teeth on the input shaft. The gear you see at the very front of the box is what drives the countershaft in the bottom.
 
Hondo, with all your upgrades, is not the MOSS 5 speed the answer???? Not to take away from Quantan, but close to the same price.

Wayne

PS There's an overdrive here that worked when I took it out a couple years ago. I might be talked into parting with it.
 
you should look at the toyota 5 speed conversion bill close has. from what I hear its the way to go.
 
Having done a Quantum conversion several years ago and being a friend and a fan of John Esposito as well as very happy with my car, I can say go for O/D.

BUT>>>>>>>

Having driven a Toyota conversion this past summer, I could never say not to go that route either.

Both are very good options if you have to do the work anyhow, or if you have the money available, as neither will likely get less expensive in the future.
 
mtlman8 said:
you should look at the toyota 5 speed conversion bill close has. from what I hear its the way to go.
Click to expand...
agree, get a 5th gear and save 1500 of the 3 grand (and it won't leak or have a short)
Altho, orig is nice, I'd not take an OD lump for the 5 speed box tho.
 
I'm putting a toy 5 speed in the TR3, but I broke a tooth off my TR6 first gear (the gear under the large one on the back that you can't see until you've pulled it apart) a few weeks back. I don't have OD, but I'd rebuilt the transmission a couple years back. It'll end up costing me about $250 to get it going this time, doing all the work myself and having a great knowledgeable club accomplice looking over my shoulder. I'm replacing the counter shaft (and caged bearings), syncro rings, shift collar springs and gaskets and will use the 1st/rev hub that was given to me by the same club member (membership does have privileges).

It's not uncommon to have some chips in the three reverse gears. Even small chips in 1st gear will not be a problem. With a complete missing tooth in 1st, everything worked fine -I didn't like the tick. But more importantly, the idea of a perfectly good tooth getting stuck somewhere it shouldn't, at a most inconvenient time was more than I could handle. -Not to mention I wasn't sure exactly what the tick was, until it was apart.

My point to all this, is you can overhaul a transmission yourself. As my father used to say 'the second time is always better'. Maybe by the third time, I'll know what I'm doing, but I'm no longer afraid of a few gears and bearings. And for me, right now, another $3k is out of the question.
 
thanks for the input, I still like the Idea of having the stock tranny and having an overdrive that works in 3 and 4 give me a 6 speed tansmission! plus I dont have to replace the drive shaft too since I ordered new u joints for Richard good.

Wayne check your pm

Hondo
 
hondo402000 said:
having an overdrive that works in 3 and 4 give me a 6 speed tansmission!
Click to expand...
Just my $.002, but have you considered getting an A-type instead of J-type? I have both, and to my mind, the A-type is much 'sportier' than the J, due to it's instant engagement and operating in 2nd gear. The J is probably the better unit overall as they fixed several shortcomings of the A-type (simpler, easier to service, easier to repair, bigger gears, etc), but it doesn't shift any faster than I can shift the main box. In fact, I have to consciously wait for it to shift when I'm using the clutch! The A-type on the other hand shifts instantly, so quick that it seems to read my mind.

I'm actually somewhat sorry I opted for the J-type on my Stag; been trying for several years now to work out a deal for a Stag A-type.

BTW, 3rd OD is so close to 4th direct that it is rarely useful, IMO.
 
my TR6 is a 71 which was built in 70 so the A type would be factory correct. and I dont have to modify the rear mount as the J type would require. So yes I am looking at the A type OD

Hondo
 
Good. That means it should also work in 2nd gear, and 2nd OD is a very nice split between 2nd direct and 3rd direct.
 
thanks to forum member I secured a nice Transmission and A type overdrive. With the help of my soon to be rebuilder I found out that the transmission in my car was actually from a 74/75 year TR6 and the one I purchased is actually a 1970 year transmission so I really got lucky and have the correct period transmission and overdrive going in my car. tomorrow the engine will come out and by next week they will be shipped off to the rebuilder.

Hondo
 
Just so you don't get a rude surprise later, note that the speedometer calibration and drive ratio are different between 1970 and 1974 TR6, by about 10%.
 
Randal thanks My spedo is the correct year for my car, I always wondered why it was wrong, So now it will go back to being right again! another plus for putting in the overdrive.

I checked it one time with one of those radars they set up on the road and it was usually reading high by a few mile per hour at like 35 it would read around 38-39

Hondo
 
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