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Triumph TR6 - toyota transmission

Gentalmen, I have been reading and learning from this sight for a while now, and know how great an asset and how helpful you all are. I want to put a Toyota 5 speed in my 72 tr while it is all apart having the engine rebuilt. I spoke to HVDA last week and he says to get a transmission first so he knows what shifter kit to send. He said the best one to get is the W58 because it has the best 5th gear ratio. He also says that there is no way to identify this tranny from the other Celica tranny's. If that is the case, how would a Toyota mechanic know what to order parts for? I would think there should be a part number cast onto the casing somewhere. Can anybody confirm or clarify this? BTW, Herman told me last week that his prices will be increasing Mar.1, so if any one else is interested, act fast!

Thank you
Rob
cc85147u
robs726

Rob, become a member and check the archives, lots of info there.
Chris
Christopher

Chris, took your advice and became a member. You were right about the archives, may have found what I was looking for. John in Alberta says that any Toyota tranny with a serial number ending in w58 is what i'm after. Time to start checking the wreckers.
Thanks
Rob
Rob

If you recheck the archives buried in there deep is a post also by John about the rebuild he did on the wrecker W58 he bought. I think he suggested to have it refurbished before installing. He was pretty pissed it failed him and had to R&R the dang thing again.
Don
DON KELLY

Hi Guys,

I've been away for a while....looks like lots of activity on the board.

I've got a W58 gearbox from a Supra sitting in my garage so I'll double check for identifying marks, serial numbers etc....

Check out my car domain website...it's under construction but I have a page on the Toyota 5 Speed conversion.

http://www.cardomain.com/ride/2509243/4

Or http://www.cardomain.com and then search.

And yes, if you can afford the costs, I'd suggest rebuilding the junkyard gearbox prior to install. I spoke with Herman after mine failed and he has never seen a Toyota 5-speed fail. The Toyota gearboxes are known to be bulletproof so who knows...)

Take care

John Parfitt
John Parfitt

Here is a better link to my Cardomain site

http://www.cardomain.com/ride/2509243/1

John Parfitt

Long time no hear John. Glad to have your "voice" with us again. Were your ears burning?
Don
DON KELLY

Hahah, yes I remember the night my gearbox failed half way to my summer vacation destination! My mood swung from "very pissed" to one of acceptance as I realized I had 4th gear available to get me the rest of the way.
(All TR6 owners have a story like this to tell, am I right?)

John P.
Bragg Creek
John Parfitt

John, thanks for responding. If there is no identifying features that you can find, that means that I will have to turn the input shaft and count splines on the outoput shaft like Herman suggests. Do you know off the top of your head what size a socket I will need to remove the output shaft?
Thanks
Rob
Rob

Sorry, flange.
Rob
Rob

Gents, I can not find a w58 toyota tranny anywhere around here. Anyone know where I might be able to source one?

Thank You
Rob
Rob

Isn't that the standard Supra trans. can't be that rare.
DON KELLY

Don
My understanding is that because there is so much rust up here, wreckers don't keep much. With the price of scrap metal where it is, they crush them after 10 or 15 years. I found one guy with a couple of Celica's but he wasn't prepared to look at them untill spring to find out what they had in them. Minus 21 C. last night. I hope spring is soon.
Thanks
Rob
Rob

Rob,

I have a W58 sitting on the shelf I would part with. Toyota gearshifter removed. Shipping would be pricey and I don't know when I'd have time to build a wood box etc. anyhow here is some background on W57 and W58 trannies - the gear ratios and the vehicles they were install in.

W58
This transmission is very popular as a replacement of other vehicles' weak stock transmissions. It came in two varieties: the original found in the 1982-1989 non-turbo Supras, Celicas and Cressidas of the early 1980's; and the version found in Mk3, Mk 4 Supras and Lexus SC 300s. The latter version has some differences from the earlier version.

Toyota lists a change from an alloy sandwich plate to a steel sandwich plate around 1989. The steel sandwich plate has some minor internal differences, and it is believed to be slightly stronger (some wider bearings, some wider gears, slightly different gear selection mechanism etc). In theory the all alloy version of the W58 should be the exact same strength as any other all alloy W-Series transmission. The steel plate version is considered much harder to find and worth approximately three to five times as much as an all alloy version.

The ratios and bolt patterns remain the same regardless of the sandwich plate used.

The W58 & W57 share the highest gearing and closest ratios (1st,2nd,3rd distance to 4th/Direct) of any of the stock W-Series transmissions.

The ratio shift was accomplished by taking the W55 base ratios and changing the input shaft to intermediate shaft ratio by 7.9%, thus shifting 1,2,3 ratios higher by that amount (4th is direct 1:1), this also shifted 5th/overdrive gear higher by the same amount creating a wider/taller overdrive ratio.

The W58 is sometimes designated as a "Close-ratio transmission", however in its stock form it does not meet all the criteria for a Close-ratio box.

Many people have the opinion that the W58 has the best gear ratios of all the W-Series for "road car" use; this seems to be supported by the favor that Toyota has shown to the W58 by including it in so many models and even building a stronger version for higher powered applications.[weasel words]

Ratios:

First Gear: 3.285:1
Second Gear: 1.894:1
Third Gear: 1.275:1
Fourth Gear: 1.00:1
Fifth Gear: 0.783:1
Reverse: -3.768:1
Applications:

1982-1986 Toyota MK 2 Celica Supra
1986-1992 Toyota MK 3 non-turbo Supra
1993-1998 Toyota MK 4 non-turbo Supra
1986 Toyota Cressida
1986 Toyota Soarer
1982-1985 Toyota Celica
1982-1992 Lotus Excel



W57
It differs from the W58 only in its fifth-gear ratio.

The W57 is sometimes designated as a "Close-ratio transmission", however in its stock form it does not meet all the criteria for a Close-ratio box.

The ratio shift was accomplished by taking the W55 base ratios and changing the input shaft to intermediate shaft ratio by 7.9%, thus shifting 1,2,3 ratios higher by that amount (4th is direct 1:1).

Unlike in the W58 the 5th/overdrive gear set was changed to create a smaller rpm drop between 4th & 5th gears so as to remain close to the overdrive ratio seen in the other boxes.

The rest of the transmission remains unchanged.


Ratios:

First Gear: 3.285:1
Second Gear: 1.894:1
Third Gear: 1.275:1
Fourth Gear: 1.00:1
Fifth Gear: 0.861:1
Reverse: -3.768:1
Applications:

1983-1986 Toyota Supra MK 2 in certain non-US markets.
1986 Toyota Crown
1986 Toyota Cressida

John Parfitt

John, you have mail.
Rob

Rob,

Sorry but didn't recieve your email.

John P.
Bragg Creek, Alberta
John Parfitt

John, I will try again. This is why I'm a plumber. I don't know diddly about computors.
Rob
rob

Rob...I once heard a good one about a physician who was upset about his plumber's bill. The Dr quipped that he was a nureosurgeon and he didn't charge such prices. The plumber replied that he didn't either...when he was a surgeon!!
db
Doug Baker

This thread was discussed between 25/02/2007 and 14/03/2007

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