Can you tell an h42 from a h41 visually?

[land cruiser kid]

Is there any differences from the H42 and the H41 by just looking at it? I had put an H41 in a 78 FJ40 and I don't seem to notice much difference from the stock H42. I was expecting my first gear to be a little lower geared than it is. I don't have the H42 to compare it to anymore.

 

[Poser]

There are not any external features of the H41 that set it apart from the H42.

The only sure way to tell is to remove the top cover and look at the size/count the teeth of first gear, or when it is not installed in a vehicle, to put it in first gear and count the rotations of the input shaft vs the output shaft...

 

[lostmarbles]

The H41 definitely should have a noticebly lower 1st gear:



Maybe you put in another H42 by mistake?

 

[land cruiser kid]

Thank you guys!

 

[Fast Eddy]

With an h41, you have to shift to 2nd before the other side of the intersection. With an h42, you can make it all the way across.

 

[land cruiser kid]

With an h41, you have to shift to 2nd before the other side of the intersection. With an h42, you can make it all the way across.

To be honest, it's been 4 years since I drove it with the H42 so it's hard to remember but I believe now I do have to shift before I get to the other side of the intersection.

 

[NoeyR]

There are not any external features of the H41 that set it apart from the H42.

The only sure way to tell is to remove the top cover and look at the size/count the teeth of first gear, or when it is not installed in a vehicle, to put it in first gear and count the rotations of the input shaft vs the output shaft...

So how many teeth should there be in a non USA H41 1st gear?

 

[Rickycruiser]

I think I can answer that

ive opened 4 gearboxes last week, all European 40/42 Bj and FJ and this is what i found

H41 ('79) teethcount starting from engine to transfer 16spline shaft
topshaft: 22, 28, 33, 41 (reverse), 41
bottomshaft: 37, 31, 21, 14, 14
this giver a ratio off 1st:4.925 , 2de:2.643, 3de:1.519 4th:1 reverse:4.925

H55F ('83) teethcount starting from engine to transfer 19spline shaft
topshaft: 26, 33, 38, 41 (reverse), 41, 23
bottomshaft: 43, 36, 24, 14, 14, 45
this giver a ratio off 1st:4.843 , 2de:2.619, 3de:1.516 4th:1 5th:0.845 ,reverse:4.843

H42 is the same as H55f, whitout 5gear offcourse

, now a question; can anybody give me the toothcount of a us gearbox?

ps; anybody interessed in a H41 gearbox (I've got plenty)

 

[NoeyR]

I'm interested in a non USA H41!

Fitment is for a 3B motor, 19 spline to split trans.

 

[Rickycruiser]

Here in pour little belgium, we call a pre 1981 4 speed with 16 spline 32mmOD output a H41
A 1981 to .... 4speed with 19spline 35mm OD a H42

here in Europe all 4speeds have a low 1st gear

H41: 4.925
H42: 4.843

the difference between them is ignorable

1piece transfercase has a low of 1.959268
splitcase has a low of 1.96078

differance is also ignorable

for the moment I have 4 H41 lying about.

 

[Rickycruiser]

I'm interested in a non USA H41!

Fitment is for a 3B motor, 34mm input cluster, 19 spline output, to split trans.

if you use a B, 1B, 2B, 3B, 3BII, 13BT,.. they always fit to the stock belhousing of a diesel H41 gearbox

 

[NoeyR]

if you use a B, 1B, 2B, 3B, 3BII, 13BT,.. they always fit to the stock belhousing of a diesel H41 gearbox

Ok so will it be a straight bolt in for my application?
3B to H41 to split t-case or prolly better with the Euro H42 as it already has the 19 spline. But I can always change out the H41 output correct? Is that a tedious job?

 

[FJ40Jim]

Ricky is slightly mistaken.
The H41 is always the low 1st gear package in the H4x series. They are 5.2ish in 74-earlier, 4.9 75-80, 4.8 81-later.

The H42 is the tall 1st gear version, with 1st gear always around 3.6

 

[NoeyR]

Ok so is this link accurate for North American and Non NA types?
http://www.cruiserfaq.com/08-01.php

 

[FJ40Jim]

Yes, that looks correct.

 

[NoeyR]

So if I'm after a non NA H41 for my appication ('81 BJ42 with 3B motor and 19 spline split t-case) is it essential that I look for a unit that was behind a diesel or is it ok with the gasser units too? If the unit has a 16 spline output, is it possible to swap that out and install my H42 19 spline?

 

[NoeyR]

I think I can answer that

ive opened 4 gearboxes last week, all European 40/42 Bj and FJ and this is what i found

H41 ('79) teethcount starting from engine to transfer 16spline shaft
topshaft: 22, 28, 33, 41 (reverse), 41
bottomshaft: 37, 31, 21, 14, 14
this giver a ratio off 1st:4.925 , 2de:2.643, 3de:1.519 4th:1 reverse:4.925

H55F ('83) teethcount starting from engine to transfer 19spline shaft
topshaft: 26, 33, 38, 41 (reverse), 41, 23
bottomshaft: 43, 36, 24, 14, 14, 45
this giver a ratio off 1st:4.843 , 2de:2.619, 3de:1.516 4th:1 5th:0.845 ,reverse:4.843

H42 is the same as H55f, whitout 5gear offcourse

, now a question; can anybody give me the toothcount of a us gearbox?

ps; anybody interessed in a H41 gearbox (I've got plenty)

For the H41 above, how is 4.925 calculated for the 1st gear?

 

[Fast Eddy]

So if I'm after a non NA H41 for my appication ('81 BJ42 with 3B motor and 19 spline split t-case) is it essential that I look for a unit that was behind a diesel or is it ok with the gasser units too? If the unit has a 16 spline output, is it possible to swap that out and install my H42 19 spline?

The input shaft is different for a 3b diesel application. A 2h diesel uses the same trans as a 2f. (As I understand it.)

 

[Rickycruiser]

For the H41 above, how is 4.925 calculated for the 1st gear?

here is my calculation

inputgear to bottom shaft: 37/22 = 1,6818
bottomshaft 1stgear to outputgear: 41/14 = 2.92857

total reduction = 1.6818X2.92857 = 4.92527

 

[Rickycruiser]

Ricky is slightly mistaken.
The H41 is always the low 1st gear package in the H4x series. They are 5.2ish in 74-earlier, 4.9 75-80, 4.8 81-later.

The H42 is the tall 1st gear version, with 1st gear always around 3.6

well, I learning every day, I believe your correct, the link with all the different gearings is verry interesting

I have to say that in Belgium the landcruiser was imported from 1975, and 99% were diesel

so all belgian imported 40 have the same gearing from pre 1981 16spline H41
after 1981 19 spline H41
After 1983 19spline H55F in the BJ42/46/70/71/73/75, HZJ70/71/73/74/75