w58 were do i come from

[GA61XX]

[QUOTE=wilbo666]I don't have first hand experience on that, but I'm lead to believe otherwise...

Found this on here http://en.wikipedia.org/wiki/Toyota_W_transmission

The W55 appears to be a base reference point for gear ratios that Toyota used to fine tune later models of the W-series.

W55 Ratios:

First Gear: 3.566:1
Second Gear: 2.056:1
Third Gear: 1.384:1
Fourth Gear: 1.00:1
Fifth Gear: 0.85:1
Reverse: -4.091:1


W57 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

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.


W58 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

[wilbo666]

I was saying that a number of people think that RT142s come with W58s (as opposed to your W55).

I'm aware of what the ratios are

Cheers
Wilbo

[Stefan]

The w58 has a steel sandwich plate, AFAIK - other w5x boxes don't. This should be a good way of identifying a w58 with a magnet, unless I'm missing something.

[RONA]

I thought the rona's have the W55 but depends because like everything there so many bastardised ronas around because of the IRS and Live rear models.

Given that 4th is quite clsoe to 5th I'd assume they are actually a W55 or 57.

[wilbo666]

The w58 has a steel sandwich plate, AFAIK - other w5x boxes don't. This should be a good way of identifying a w58 with a magnet, unless I'm missing something.

Some W55's also had steel sandwitch plates.

And not all W58s have steel sandwitch plates (MA61 for example has a W58 and an alloy sandwitch plate, early MA70s also have alloy sandwitch plates).

Cheers
Wilbo

[77tback]

w-55 trannys have steel housings, w-58 is aluminum. The cross member also is approx 2" further back on the w-58. My 77 Celica came with a w-55, last spring I changed to a w-58. It seems to have longer gears, and my speedo now reads about 20kmh faster than I am going. I think maybe they went with the 58 after 84.

Gabe J

[twentyEight]

w-55 trannys have steel housings, w-58 is aluminum. The cross member also is approx 2" further back on the w-58. My 77 Celica came with a w-55, last spring I changed to a w-58. It seems to have longer gears, and my speedo now reads about 20kmh faster than I am going. I think maybe they went with the 58 after 84.

Gabe J

Wow, you really need to change your speedo gear...

[Shifty]

w-55 trannys have steel housings, w-58 is aluminum

Wrong. The W50 is the steel case.

[Stefan]

w-55 trannys have steel housings, w-58 is aluminum. The cross member also is approx 2" further back on the w-58. My 77 Celica came with a w-55, last spring I changed to a w-58. It seems to have longer gears, and my speedo now reads about 20kmh faster than I am going. I think maybe they went with the 58 after 84.

Gabe J

Wrong. You're comparing W50 with W55/7/8.

[77tback]

Sorry guys, my first post and I'm giving bad info. Yes it likely was a W-50 trans. The fire wall plate says A-40 if that helps. Yes some day I will try to get a closer speedo gear for my new trans. I just threw it in when my orig trans locked up. My Celica is my sole transportation in the summer. A buddy had given the trans to me about 12 yrs ago and said this will fit your car and will never blow. So far so good.
Sorry again for the bad info and will double check befor posting.

Gabe

[LeeRoy]

W58 also comes in both alloy and steel sandwich plates. The steel one is meant to be stronger from what ive heard and read but i havent had either open for comparison.

Heres what this site says about strength

Toyota lists a change from an alloy sandwich plate to a steel sandwich plate in ~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 mechinism etc). The ratios remain the same regardless of the sandwich plate used.

Original info Here

And back on topic the W58's origin according to the above site

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.

This site also has some good info Click me

Another link to old toymods 57/58 discussion Here

- LeeRoy