Split Case Ratio (1 Viewer)

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Tapage

Tapage

Club 4X4 Panamá
Joined
Apr 4, 2003
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Panamá
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Hi all folks .. I have a HJ-60 1987 with H55F trany and Split Case transfer case recently ( this last week end ) prepared all things to install my new MAF low gear set, 1.08 Hi and 3.05 Low. Fine, but my surprise when discover that my Split Case have 1.96 Low ratio ..

Now isn't important, I haev already installed my new low gears, but in y books and on internet I always found info about 2.28:1 ratio for my split case .. .

In now, did you have some info about this .. 2.28 for gas engine and 1.96 for diesel engines .. ?

thanks all ..
 
Perhaps on the non-US (Diesel) models it is different?

M
 
Mike S said:
Perhaps on the non-US (Diesel) models it is different?

M
Click to expand...

I'm not sure .. that the diference becomes from USA or non USA specs, but I'm try stablish a relation to know, what is the reazon to have 1.96 or 2.28 in 2 split cases looks identical ..

http://www.off-road.com/tlc/faq/trans.html
 
Someone else will have the exact dates, but when they went with the longer H42 assembly/H55F, they swtiched to a higher transfer case low range. They also went with a larger idler with the higher gear ratio.

I think it was '81-84 2.27
84+ 1.96

EDIT: even in your instance, you should have ascertained that it was a 1.96 case by looking at the FAQ:

H55F F,B,H,HZ 83- 5 4.843 2.619 1.516 1.000 0.845 4.843 1.959 19 NOT USA
 
I already have 38mm stock shaft in my split case .. One friend disarm his split case in a BJ-40 1980 with H42 tranny, surprise .. 1.96

Here in Panamá, u can not found a HJ-60 or BJ-60 with H55F prior 85 ( year of switch ) all becomes with H42 and split case .. actually I haven't a oportunity to check live this split cases ..
 
I may be wrong, but I am pretty sure that the earlier FJ60's had 1.959 Tcase ration in LR, and the later ones were 2.276. I believe my '87 is 2.276... the same that was used with the H55F.

M
 
Mike S said:
I may be wrong, but I am pretty sure that the earlier FJ60's had 1.959 Tcase ration in LR, and the later ones were 2.276. I believe my '87 is 2.276... the same that was used with the H55F.

M
Click to expand...

Mike is right. The switch to the 2.27 was in 10/84 ('85 model year) and the 38mm idler shaft came in mid to late '86. That's why I bought an '87 transfer case to go with my planned H55f swap. It should hold up better to the Toybox. :eek:
 
Mike S said:
I may be wrong, but I am pretty sure that the earlier FJ60's had 1.959 Tcase ration in LR, and the later ones were 2.276. I believe my '87 is 2.276... the same that was used with the H55F.

M
Click to expand...

Mike,
I've been told the opposite. The older split tranfer cases had the lower range than the newer at least in Canada.
 
RredFJ40 said:
Going by the TLCA FAQ 80-85 should have 2.27 while 86 on should have 2.29

http://birfield.com/modules.php?name=TLCFAQ&p=/~ramullen/FAQ/TEXT/08-01.html
Click to expand...

I think the TLC FAQ is perforated with errors. I would really not rely on it for a whole lot of specifcs unless you have verified yourself.

I am almost 100% certain that my 1987 T-case was 2.276:1 and I know for sure that a 1989 FJ62 t-case is 2.276 and they share the same idler gear part number, so I would guess that from about 4/86 and on, the ratio is 2.276 for sure. prior to that, I think they were 1.96:1, but I dont know for sure, so dont quote me.
 
ridgerunner said:
Someone else will have the exact dates, but when they went with the longer H42 assembly/H55F, they swtiched to a higher transfer case low range. They also went with a larger idler with the higher gear ratio.

I think it was '81-84 2.27
84+ 1.96

QUOTE]

While I can't speak for *all* markets, the above is the general rule. I know all H55F equipped Land Cruisers had the 1.96 to one, at least that's what my FJ62 came with stock.
Click to expand...
 
cruiserbrett said:
I think the TLC FAQ is perforated with errors. I would really not rely on it for a whole lot of specifcs unless you have verified yourself.

I am almost 100% certain that my 1987 T-case was 2.276:1 and I know for sure that a 1989 FJ62 t-case is 2.276 and they share the same idler gear part number, so I would guess that from about 4/86 and on, the ratio is 2.276 for sure. prior to that, I think they were 1.96:1, but I dont know for sure, so dont quote me.
Click to expand...

3B,2H,1HZ 86- 5 4.843 2.619 1.516 1.000 0.845 4.843 2.296 19 NOT USA

In order of this info, was wrong .. I'm pretty sure that my low gear set are 1.96:1 and also I'm pretty sure that mi HJ-60 with H55F 1987 is the stock tranny ..

old-sproket.jpg


actually my question is .. this TLC Faq info is only for USA market ( Gas engines . ? ) maybe is interesant, check this info in autralia,

old-gears.jpg
 
Appologize about stating 2.276:1, as it is 2.296:1 I just took apart my spare 1989 FJ62 t-case and counted the teeth. Input: 32, Hi speed side of idler:43, low speed side of idler: 24, hi output gear: 32, low output gear: 41.

Doing the math, to get low range it would be (hi ilder/input)X(low output/low idler) which is (43/32)X(41/24)=2.296


This t-case has the same idler gear as the 4/'86 and newer split cases (maybe only in the US?) so they would also have the same ratio.
 
Hi Cruiserbrett .. thanks for your time ..

In my stock split case I was

Input: 32, Hi speed side of idler:43, low speed side of idler: 26,low output gear: 38.

Ratio= ( 43/32 ) * ( 38/26 ) = 1.9584 :(

As you seen the difference is in low speed indler ( make sence no .. (;) ) and low output gear ..

And the question is .. is a engine one diference for this issue or market .. ?
 
Could be that they used one ratio for the Diesels, and another for gas engines? Or maybe it varies by market? I admit to being uncertain about the universality of TLC specifications.

M
 
Mike S said:
Could be that they used one ratio for the Diesels, and another for gas engines? Or maybe it varies by market? I admit to being uncertain about the universality of TLC specifications.

M
Click to expand...

Yes .. I mean that .. maybe, with an Canadian TLC with H55F and disel engine, we can check this .. any voluntier . ?
 
The FAQ is accurate for Canada, (where it was written) In any other market, all bets are off. I'll wager your HJ60 with H55f and 1.96 t-case has 4:11's in the diffs. In Canada the same truck had 2.29 in the case and 3.7 diffs. It made for effectively the same crawl ratio but a lower rpm for the highway. I'm guessing Toyota thought most HJ60s would see faster highway speeds in Canada than Central America.

It seems that a five speed rig got low gears in the t-case or in the diffs but never both.

(Waiting the fourty three seconds it will take for somebody to prove me wrong)
 
lowenbrau said:
The FAQ is accurate for Canada, (where it was written) In any other market, all bets are off. I'll wager your HJ60 with H55f and 1.96 t-case has 4:11's in the diffs. In Canada the same truck had 2.29 in the case and 3.7 diffs. It made for effectively the same crawl ratio but a lower rpm for the highway. I'm guessing Toyota thought most HJ60s would see faster highway speeds in Canada than Central America.

It seems that a five speed rig got low gears in the t-case or in the diffs but never both.

(Waiting the fourty three seconds it will take for somebody to prove me wrong)
Click to expand...

I'm very confused again .. K052 3.70 with open diff in mi rig from stock. Not underestand Toyota ( again ) with this steup.

Diesel engine, full HJ-60 with 1.96 on T-Case and 3.70 on the diff sounds very bad to me. But was my case ..
 
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