I'm on the look out for a good deal on a split case. The reason I'm going with this tranny is that I needed a lower first gear to get the pig rolling with the OM617 without losing top end power.
Info from
http://thewagonway.com/?p=1954:
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H42-
By and large the most common tranny found on US rigs, from 80 to 87. Was installed in two versions, short and what many call the long case model with the spacer. The spacer model appeared in april of 85 in the US, possibly earlier overseas. This tranny has the best road manners of all the manuals that were available.
1st 3.555
2nd 2.292
3rd 1.41
4th 1
Rev 4.271
-H41-
Not as common as the H42 and has very different ratio’s. No external markings to differentiante it from the H42, only easy way to tell them apart is to put them into first gear and count how many times the intput shaft goes around while you turn the ouput shaft, H41 should go around more than four times while the H42 will spin less than four for every revolution of the output shaft.
Essentially it has the same ratio’s as the H55 just minus 5th gear. Not sure if it was sold in a long case version or not. Great tranny to swap in for off road use do to the low first gear and are way cheaper than the H55, especially if you don’t want to do a gear swap. Unfortunately not the best road manners due to what many call gaps in the ratio’s. Most noticeable when mounted behind a 3B
1st 4.843
2nd 2.618
3rd 1.516
4th 1
Rev 4.843
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H55-
What many consider the ultimate Landcruiser tranny, why it was never sold in the US still boggles my mind. All the same gearing as an H41 with the addition of an overdrive 5th gear. Only available in a long case version, mainly due to the fact 5th gear resides on the back side of the main gearbox and is concealed in the spacer. Pretty ingenious of Toyota to come up with this. Two trannys, same gearbox casting. Even the shift mechanism is somewhat of an add on as it’s external in relation to the other gears, comes out the top cover and hooks to the linkage in the spacer. For obvious reasons the same less than stellar road manners behind a 3B.
1st 4.843
2nd 2.618
3rd 1.516
4th 1
5th 0.845
R 4.843