Don't know how accurate this is, but this guy on Edmunds sounds like he knows what he's talking about. Judge for yourself (thanks to Stanny if it is correct):
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Being a 53 year old gearhead and having some contacts at Toyota, I have as much info as I can get on the new IS300 Manual Tranny. It looks like a brand new design and this is saying something about Toyota. Most manufacturers today do not have the engineers nor the demand to take on the task of designing a new Manual tranny, which costs millions to do today. They must have started this project way before the IS300 was introduced.
So here are the ratios:
1st: 3.566
2nd: 2.056
3rd: 1.384
4th: 1.000
5th: .850
Final Drive: 3.727
Overall, a real "close" ratio box fit for a "boy racer" performance car.
I'd heard that the rear drive was in the 3.80 range, but with this unusual fifth gear ratio at .85 instead of a more common .70-.75, the 3.727 would be more in line to keep NVH and revs lower and meet CAFE standards.
The new tranny is called the W55. It is evidently a Toyota designed and manufactured unit as it is overdrive and the Getrag 220 series is their current RWD five-speed design and has a 1:1 fifth.
The ratios are different than any Toyota I've seen and that probably means a different case - in other words, all new. The old W58 as used in the Supra was quite large, and probably too big to fit in the smaller Lexi.
I don't know what the ratios are in the automatic, but it would be interesting to see if the torque multiplication in each gear is overall similar. There is a chance that the cams in the Manual are slightly different also. More info coming...
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That is all.
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Being a 53 year old gearhead and having some contacts at Toyota, I have as much info as I can get on the new IS300 Manual Tranny. It looks like a brand new design and this is saying something about Toyota. Most manufacturers today do not have the engineers nor the demand to take on the task of designing a new Manual tranny, which costs millions to do today. They must have started this project way before the IS300 was introduced.
So here are the ratios:
1st: 3.566
2nd: 2.056
3rd: 1.384
4th: 1.000
5th: .850
Final Drive: 3.727
Overall, a real "close" ratio box fit for a "boy racer" performance car.
I'd heard that the rear drive was in the 3.80 range, but with this unusual fifth gear ratio at .85 instead of a more common .70-.75, the 3.727 would be more in line to keep NVH and revs lower and meet CAFE standards.
The new tranny is called the W55. It is evidently a Toyota designed and manufactured unit as it is overdrive and the Getrag 220 series is their current RWD five-speed design and has a 1:1 fifth.
The ratios are different than any Toyota I've seen and that probably means a different case - in other words, all new. The old W58 as used in the Supra was quite large, and probably too big to fit in the smaller Lexi.
I don't know what the ratios are in the automatic, but it would be interesting to see if the torque multiplication in each gear is overall similar. There is a chance that the cams in the Manual are slightly different also. More info coming...
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That is all.