H41 / splitcase

[allan man]

I got a hold of a H41/split TC already mated together from a member....supposively from a 1980 FJ 40 from australia.....ive read that the H41 can be a direct swap over the H42 without any mods...
However id like to take advantage of the splitcase being mated already and its advantages over the current 4speed TC i have ....like the slightly low gearing 2:31 ,quietness,etc,etc....


what would i expect to modify if i did the swap with the splitcase??
basicly if there is alot to be modded im trying to weigh it out if its worth the 15% of the lower gearing 1:99 versus 2:31.
or would this also be a direct swap?

My current set up:
1974 FJ40
SBC
4 speed transmission
4 speed transfercase
33s with 4:11s

Your knowledge is always greatly appreciated...

 

[handcannon]

You don't have an E-brake on the split case rear output. From what I have seen here on MUD parts can be purchased to add the E-brake to the splitcase.

 

[allan man]

will my speedo cable plug right in the split-tc ?

 

[Vicm]

I think it will, but it is not a big deal to try it on.
I am pulling an h41 and splitcase out of a BJ60 with a 3B, I can try it and report back to you.
I am In the same situation as you.
I want to put the split case with th h41 in my 40, but I already have Full floater rears with discs, so I need to think about the e-brake.
I might just go with the 4sp case, since I am not too cencerned of offroad use.
Cheers.

 

[allan man]

I can try it and report back to you.[/QUOTE]

Yeah pls. do....thanks

 

[Josie'sLandCruiser]

Hi All:

The later model "split" type transfer case is yet another example of the evolutionary approach that Toyota used in the Land Cruiser line.

The "split" t-case is stronger and quieter than the earlier one-piece (aka "three-speed" and "four-speed" t-cases.)

IIRC, the early (1980-83?) USA-market FJ60s came with a 2.28 low-range. Later "split" t-cases had a like a 1.99 low-range. Do you really know what the low-range gearing is in the split 'case you've got

To use this H41/t-case combo you will need to adapt the 1980s-style transmission mount to your rig. This mounts underneath the H41/42/55F more like a cradle.

Like has already been mentioned, you will need to figure out what to do about the missing parking brake. Yes, Spector Off-Road sells all the parts to put a t-case mounted p-brake on a split 'case, but there are other options out there.

Good luck!

Alan

I got a hold of a H41/split TC already mated together from a member....supposively from a 1980 FJ 40 from australia.....ive read that the H41 can be a direct swap over the H42 without any mods...
However id like to take advantage of the splitcase being mated already and its advantages over the current 4speed TC i have ....like the slightly low gearing 2:31 ,quietness,etc,etc....


what would i expect to modify if i did the swap with the splitcase??
basicly if there is alot to be modded im trying to weigh it out if its worth the 15% of the lower gearing 1:99 versus 2:31.
or would this also be a direct swap?

My current set up:
1974 FJ40
SBC
4 speed transmission
4 speed transfercase
33s with 4:11s

Your knowledge is always greatly appreciated...

 

[orangefj45]

the bolt pattern for the early spl;it case and the 40 series 4spd shafts should be the same but the length will change.

i have one of these combos in my troopie and love it. i also have another one sitting on the shelf if anybody is looking for one.

fwiw, TSM makes a nice ebrake kit for the split case as well, sells for $350 and is an external bolt-on.

here's a rough pic, can post more detailed pics tomorrow night.

georg @ valley hybrids

 

[allan man]

Georg,So basicly its not take out H42 and drop the H41 in.....because the output shaft is different in length between the two....are the output shafts interchangeable? could i have avoided this if i had bought a H41 that was mated with a one piece TC. instead of a splitcase,would that had been a direct swap?

 

[cruiser_guy]

Georg,So basicly its not take out H42 and drop the H41 in.....because the output shaft is different in length between the two....are the output shafts interchangeable? could i have avoided this if i had bought a H41 that was mated with a one piece TC. instead of a splitcase,would that had been a direct swap?

Yes, the H41 and H42 have EXACTLY the same exterior dimensions. There is NO way to tell the difference except by spinning the tranny in first gear.

If I were in your situation I would solve the e-brake issue by using a rear axle from an '81 or newer FJ40/BJ40/BJ42 as they moved to an axle mounted e-brake in those years.

 

[cruiser_guy]

I am pulling an h41 and splitcase out of a BJ60 with a 3B, I can try it and report back to you.

If this is a Canadian BJ60 and has the original tranny it is NOT an H41. Check the firewall VIN plate. '82 and older are H42, '83 and newer are H55.

 

[orangefj45]

you can swap the main shafts in the transmissions if you want to keep the early t-case. it's a little bit of work and requires a puller but it's not impossible. however, the bolt pattern on the back of the transmissions is also different for the different t-cases so what it comes down to is that you'd have to put the gear set from the h41 into the h42 or you won't be able to bolt the t-case up.

personally, i like the split cases a lot better than the earlier counterparts. but it all depends on how the vehicle will be driven and used. if you have any intention of gearing lower and you do not want to change the axle gears, then an orion will bolt right onto the back of the early trans. currently there is only one lower gearing option available for the split case and it's by mark's offroad from oz, sold over hee thru AA. the lowest gearing they offer is a 3.15:1 and it also changes high-range to a slight OD. but the gear sets are notoriously noisy and run very hot so most people do not like them at all. there is talk about another lower ratio gear set for the split case coming ut in the future ut it's just talk for now. i would'nt hold my breath.

if i were you, i'd do a little more research on running the split case. usre, it's going to require a new x-member, modified drive shafts and you'll have to do something about the parking brake but the case IS that much smoother, quieter and stronger.

weigh your options and go from there.

hth either way!

georg @ valley hybrids

 

[cruiser_guy]

however, the bolt pattern on the back of the transmissions is also different for the different t-cases so what it comes down to is that you'd have to put the gear set from the h41 into the h42 or you won't be able to bolt the t-case up.

Georg, I don't want to contradict a 'Cruiser expert like yourself but I have an H41 gearset in an H42 case from a BJ60 bolted to a three speed transfer case and a 3B diesel in my FJ55. How's that for a mix of parts?

The difference between the split case and the one piece case is that the one piece case uses a cover plate on the back of the tranny to transition from tranny to transfer and the split case incorporates the cover in the transfer front plate.

 

[orangefj45]

Georg, I don't want to contradict a 'Cruiser expert like yourself but I have an H41 gearset in an H42 case from a BJ60 bolted to a three speed transfer case and a 3B diesel in my FJ55. How's that for a mix of parts?

The difference between the split case and the one piece case is that the one piece case uses a cover plate on the back of the tranny to transition from tranny to transfer and the split case incorporates the cover in the transfer front plate.

correct, this holds tru for the early h4x cases but not the later ones.


besides, i'm not an expert, just a cruiser-nerd!

 

[Vicm]

If this is a Canadian BJ60 and has the original tranny it is NOT an H41. Check the firewall VIN plate. '82 and older are H42, '83 and newer are H55.

I am not really sure if it is the H41, but it seems to be the H42 from what I have seen done to this bj60, I won't know for sure till I pull it out.
The other H41 I have, came with a German 40 ,bolted to a 4sp case.
Would you know the size of the output shaft staked nut for the H42 when bolted to the split case?

I can try it and report back to you.

Yeah pls. do....thanks [/QUOTE]
I tried that , no problem ,it fits.

I agree with orange45, if that is the h41 and since it is already bolted to the split case,I would use the assembly and look for a later 40 axle to solve the e-brake issue. Good luck.

 

[FJ40Jim]

the bolt pattern for the early spl;it case and the 40 series 4spd shafts should be the same but the length will change.

This is not correct. The split case is architecturally identical to the one piece case.

Note that the PN for D-shafts in FJ40 does not change 1974-1984.

 

[FJ40Jim]

IIRC, the early (1980-83?) USA-market FJ60s came with a 2.28 low-range. Later "split" t-cases had a like a 1.99 low-range.

This is not correct. All USA splits have a low range of approx 2.28. Search and there is a thread where actual tooth counts were posted up verifying hi and lo ratios. There is a very slight change, starting in mid 86.

Note that there is one PN for the low output gear 1980-1986, indicating no change in ratios prior to that.

So far, the only verified use of the 1.99 ratio is behind the H55.

It would be interesting to crack open this H41 split case and see what the tooth counts are. Since it has the lower 1st gear shared w/ the H55, it would be consistent to have the taller (1.99) low range.

To use this H41/t-case combo you will need to adapt the 1980s-style transmission mount to your rig.

Not absolutely. The H41 can hang off the BH if that is how the truck is configured. H41 is no longer or heavier than the H42 it is replacing.

Since the OP is using an SBC, the truck probly has the 'propeller' rear mount.
This would be a good opportunity to upgrade to a real tranny mount underneath the transmission.

 

[FJ40Jim]

BTW, the pictured H41/splitcase combo is also equipped w/ Fairey Overdrive.

 

[orangefj45]

It would be interesting to crack open this H41 split case and see what the tooth counts are. Since it has the lower 1st gear shared w/ the H55, it would be consistent to have the taller (1.99) low range.

hmmm, i have an H41/split case combo in my 84 troopie and another combo sitting on a pallet in "the stash". i could climb up there and check it out next week. should be easy enough to figure out without splitting the t-case open, especially since i just resealed it.

 

[allan man]

I thought id post this up for future reference.....
Thanks to everyones input.





(QUOTE)

I suspect it will have the same 1.99 low range as found behind the H55. H41 and H55 are the same, except H55 has the OD tacked onto the back end.

You can easily tell if it is 41 or 42 gearset by counting turns in 1st gear. W/ the trans in 1st gear and t-case in 2Hi, scribe a little mark on the input shaft and the output flange. Now turn the input shaft and count how many revolutions it takes to get the output flange to make 1 revolution. It will either be 3.5 turns or 4.8 turns.

You can use the same technique to get the t-case ratio. Put the transmission in 4th gear (1:1) and T-case in Lo-range. Turn the input to make 1 full turn at the rear flange. It will either take 2.0 or 2.3 turns to get the rear to go around once.

The transfer case is equipped w/ a Fairy Overdrive. Make sure it is in direct drive, not O/D, when doing these tests.

Thanks,
Jim Chenoweth
TLC Performance
Lancaster, Ohio, USA