H41 H42 help needed

[hammered]

I am sure this has been hashed out in one of the forms, but I can't find the info I need.


1st?
Can I swap a 19 spline output with my current 16 spline output. H41 gearbox.
I want to hook a split case up and not sure if the outputs are interchangeable.


2nd is, if I send someone the input and gears out of a H41 can he put it into his H42 case.
What would he need in order to convert is H42 into a H41?
We are trying to save a buck but sending just the internals rather than the whole gearbox.


Thanks for any info anyone can offer up.

 

[Stumpalama]

Yes, and Yes...

I have H41 gears (w/ 16 spline out) in my later H42 (with transmission support) box, hooked up to an Orion.
I highly recommend it.

You can do the swap yourself, but be prepared to break some tools or sacrifice an output shaft to get the old gears out of the box... apparently the rear bearing is a B***h to get out.

Mark from Marks Offroad built the trans for me. He is good people and does excellent work.

Good luck.

 

[cruiser_guy]

The second I've done for my FJ55 and the first I'd bet on as well. I also have the guts from an H41 for a "B/3B" engine here in Guatemala. It would work for an "F/2F" if you have the right input shaft.

As has been said, getting the bearings out can be a real chore.

You will need ALL the gears as well as the counter gear shaft from the H41 to make the swap.

 

[Nick the Carpenter]

hi there i did a h41 to h42 swap and for memory i used the lay sharft, first,second cluster set. 19
spline sharft is the same on the gear end. Input sharft is the same on the gear end B,H,f the spline is different.Pulling bearings i made my own tools and to push them in i made my own tools.If you get stuck i have brand new 19spline .........do not know how much $$$$$ for the ride from AUS but it sitten there.Hope this helps and makes sence

 

[cruiser_guy]

Input shaft is the same on the gear end.

Are you sure of this??

 

[Nick the Carpenter]

Are you sure of this??

have two on my desk look the same the spline end differant one 16 one 19.For memory i stated with a gear box from a 2b 4 speed with split case and finished with a 2f 4 speed onepeace case with over drive got rid of the crawler gear.

 

[cruiser_guy]

But Nick, is the input end the same? The part between the engine and the remainder of the tranny and that rides on the clutch disc? I know the output shaft is all the same as there are no gears cast into it, just the different spline counts. I have always been under the impression that the input shaft for an H41 and an H42 have a different gear at the end and that gear is part of that lower range.

Can you confirm that the input shafts for the H41 and H42 are interchangeable? That's part #3 in the picture.

 

[Nick the Carpenter]

But Nick, is the input end the same? The part between the engine and the remainder of the tranny and that rides on the clutch disc? I know the output shaft is all the same as there are no gears cast into it, just the different spline counts. I have always been under the impression that the input shaft for an H41 and an H42 have a different gear at the end and that gear is part of that lower range.

Can you confirm that the input shafts for the H41 and H42 are interchangeable? That's part #3 in the picture.

had a look at some they are same teeth count different spline EG petrol/diesel.The gear on the input shaft as i understand is fourth gear and dose not change in the four speed 4= 1to1 ratio.However the lay shaft are different the first on the lay shaft is different fourth been at the front of the box is the same. i did this in 1997 so memory is .It works very well when you need to split gears. Hay i have a ten speed

 

[Nick the Carpenter]

sorry pic did not work for me

 

[cruiser_guy]

sorry pic did not work for me

I think the forum upgrade changed file sizes for the *.gif format.

The gear on the input shaft as i understand is fourth gear and dose not change in the four speed 4= 1to1 ratio.However the lay shaft are different the first on the lay shaft is different fourth been at the front of the box is the same. i did this in 1997 so memory is .It works very well when you need to split gears. Hay i have a ten speed

The way I understand it is that in 4th gear the input and output shafts are linked together.

 

[cruiser_guy]

Pic works again!

 

[65swb45]

Keep in mind that though case dimensions are the same, there are two different extension plates on the 74-80 models, the latter having one extra hole.

 

[cruiser_guy]

Keep in mind that though case dimensions are the same, there are two different extension plates on the 74-80 models, the latter having one extra hole.

I've noticed that. I have at least one of each.

Do you know if the input shaft, part #3 in the picture is common between the H41 and H42? I don't think it is but Nick says otherwise.

 

[Cruiserdrew]

I've noticed that. I have at least one of each.

Do you know if the input shaft, part #3 in the picture is common between the H41 and H42? I don't think it is but Nick says otherwise.

Having done this, I can assure you they are different. The spline count is the same, but the input gear is part of the input shaft and the H41 and H42 have different numbers of teeth. So it looks the same but would not interchange with an H42 gearset.

 

[cruiser_guy]

Having done this, I can assure you they are different. The spline count is the same, but the input gear is part of the input shaft and the H41 and H42 have different numbers of teeth. So it looks the same but would not interchange with an H42 gearset.

Thanks, that's what I thought.

 

[FJ40Jim]

Having done this, I can assure you they are different. The spline count is the same, but the input gear is part of the input shaft and the H41 and H42 have different numbers of teeth. So it looks the same but would not interchange with an H42 gearset.

X2

 

[hammered]

I can't really figure the swap out here as there seems to be mixed opinions on the parts needed.

I gather the input has to be H41.
Output sounds like they are interchangeable.
How about the bottom end. does this need to be shipped also.
Just trying to help a guy out here.
He wants to swap his 42 over and it would be easier for me to ship the 41 parts rather than the whole thing.

If someone could use the numbers off the SOR shot below and lay it out # by # that would be awesome.

Might help others in the future also.

Thanks for all the help here.

 

[cruiser_guy]

You will need to ship everything but the housing/case, output shaft and reverse shaft, I'm not sure if the reverse gear is the same or not, I swapped it to be sure. I have done the conversion but it was a year or two ago. It was just when Nick said the input shafts were the same I thought I might have missed that.

Obviously bearings and syncros will be replaced by whoever is doing the swap.

 

[Cruiserdrew]

I can't really figure the swap out here as there seems to be mixed opinions on the parts needed.

I gather the input has to be H41.
Output sounds like they are interchangeable.
How about the bottom end. does this need to be shipped also.
Just trying to help a guy out here.
He wants to swap his 42 over and it would be easier for me to ship the 41 parts rather than the whole thing.

If someone could use the numbers off the SOR shot below and lay it out # by # that would be awesome.

Might help others in the future also.

Thanks for all the help here.

The counter shaft (that's the one in the bottom) is different too. Only the output shaft is the same. All of the machined gears are different, though I am not sure about reverse. When I rebuilt my H42 into an H41 I think the reverse gear is interchangable.

 

[FJ40Jim]

I am not sure, but I am gonna guess that reverse gear is also different, because the reverse ratio is different between the two boxes.