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 Posted: 03-30-2017 03:31 am
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 289
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Don,

Sorry, I don't have a straight answer for you about where the Toyota transmission's ID number might be. But here's some general info about the Toyota W-series gearboxes.

The W55 is the first of the W-series. It’s rated for 160 Hp max.
Applications:
1982-1983 Toyota Carina
1981-1985 Toyota Celica
1983 Toyota Corona
1986 Toyota Soarer
1986 Toyota Crown
1983 Toyota Chaser
1984-1995 Toyota Pickup 2WD with 22RE(EFI) engine
2002-2005 Lexus IS300 (US Market only)

The W56 is a truck transmission, and its ratios are not appropriate for a JH.

The W57 is what Conversion Components calls the “Close Ratio” gearbox. It’s like the W58, but with a lower O/D ratio.

If you're looking for that tall over-drive gear for relaxed freeway cruising, then skip over this W-57 and go for the W58.

If you're replacing the stock JH5 Getrag 5-spd with it's 1:1 5th and 3.45:1 rear axle ratio, then the W57 becomes more of an option since it's modest O/D ratio combined with the relatively tall rear axle ratio gives a pretty relaxed rpm at cruise. The W57 is rated for 175 Hp Max, and a hotrod 9XX can exceed that power level.

Applications:
1983-1986 Toyota Supra MK 2 in certain non-US markets.
1986 Toyota Crown
1986 Toyota Cressida
1982-1985 Toyota Celica (21R)

The W58 is the transmission Lotus used in the 4-seat 1982-92 Excel & Excel SE, and it’s the one many Jensen-Healey owners seek. It differs from the W57 in its taller fifth-gear ratio that gives the most relaxed cruise of any gearbox discussed above.

The W58 came in two varieties: the original found in the 1982-1989 non-turbo Supras, Celicas and Cressidas of the early 1980s; and the later version found in Mk3/ Mk 4 Supras, and Lexus SC 300s.

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 (it uses some wider bearings, some wider gears, slightly different gear selection mechanism, etc.). In theory the all-alloy version of the W58 should be exactly the 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.

Toyota engineers have shown favor to the W58 over the rest of the 'W' series by including it in so many models and even building a stronger version for higher powered applications.
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
1982-1992 Lotus Excel
1992-1997 Lexus SC300
1998-2005 Lexus IS300 5 speed

The W59 is another truck transmission, and it's ratios are not appropriate for a JH.

The JH 4-speed cars use a 3.73:1 rear axle ratio, while the 5-spd cars use a 3.45:1 rear axle ratio. If you're upgrading a 4-spd / 3.73:1 car, then the W58 with it's taller 0.783:1 5th gear will give a better overdrive result... see the ratio chart below.

If you're replacing the stock JH5 Getrag 5-spd, then the combined 3.45:1 final drive and the W58's tall 0.783:1 5th gear may be more than a stock 2.0 907 can pull comfortably. It might be fine as a flat-land cruiser, but perhaps less than marginal for hill country. In that case, the W57 with it's 0.861:1 5th gear will still give a taller overall overdrive than the stock Getrag 5-spd, but still more reasonable for the 907. A hotrod 2.2 or 2.5 should be able to pull either one. "Disappointment is a function of expectations".

Internal Ratios, and Overall Top Gear Ratios:
…………… 1st ………… 2nd ……… 3rd ………… 4th ………… 5th … Rated Capacity
W55 … 3.566:1 … 2.056:1 … 1.384:1 … 1.000:1 … 0.850:1 … 160 Hp
……………………………………… times 3.73:1 final drive = 3.196:1 … Okay. More relaxed than stock JH 5-spd.
……………………………………… times 3.45:1 final drive = 2.933:1 … Relaxed O/D Cruise

W57 … 3.285:1 … 1.894:1 … 1.275:1 … 1.000:1 … 0.861:1 … 175 Hp
……………………………………… times 3.73:1 final drive = 3.212:1 … Okay. More relaxed than stock JH 5-spd.
……………………………………… times 3.45:1 final drive = 2.970:1 … Relaxed O/D Cruise

W58 … 3.285:1 … 1.894:1 … 1.275:1 … 1.000:1 … 0.783:1 … 204 Hp
……………………………………… times 3.73:1 final drive = 2.921:1 … Relaxed O/D Cruise
……………………………………… times 3.45:1 final drive = 2.701:1 … Ufdah ! Too tall? Use with 2.2 or 2.5 stroker.

The stock JH 4-spd & 5-spd both have 1:1 top gears. The 5-spd is a better 'cruiser' only because it's mated with a taller 3.45:1 axle ratio.
… Stock JH 4-spd 1:1 4th times 3.73:1 final drive = 3.73:1 … Revvy / buzzy cruise.
… Stock JH 5-spd 1:1 5th times 3.45:1 final drive = 3.45:1 … Better cruise than 4-spd, but not really 'relaxed'.

Regards,
Tim Engel

Last edited on 07-03-2017 12:12 am by Esprit2