Tech Talk: H55F Input Shaft & Bearing Retainer Tech/ID Page (2 Viewers)

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cruiseroutfit

cruiseroutfit

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H55F Input Shaft, Bearing Retainer and Bearing Tech and Identification Guide - Full Nerdery!

First, there are many great posts on this subject here on Mud but they are in dozens of different threads. I wanted to share some of our internal reference docs and information we use to assist customers and build H55F/BF1 Split T-Case transmissions and transmission/t-case combos.

1711135936235.png

(33030-60450 / Cruiser Outfitters Part# TR60450 Shown)

There are 20+ different iterations of the H55F (EPC: 33030), many are minor changes, the most prevalent differences being associated with the Input Shaft (EPC: 33311) and Front Bearing Retainer (EPC: 33131). Input shafts are matched to the front bearing retainer by the bearing, seal and length. Fortunately these changes are easily identified both externally and internally.

1711131564595.png


The H55F has (10) different input shaft variants for use behind the B, F, H, & HD/HZ family motors. Those (10) supersede to (5) different total variations. B early & late, F/H early & late, and 1HD/1HZ. All of these shafts have a 26-tooth count on the gear itself. The shaft splines are available in a 10 (~27.7mm OD) or 21 (27.8mm OD) as well as 3 different overall all shaft lengths (measured when loose from transmission), 245mm, 260mm, and 280mm.

The major difference is the internals and they correspond to those early (10/1982-9/1985) and late (10/1985+) versions of each transmission.
Note: there is only (5) because there was never an early (10/82-9/85) version of the 1HZ 21 spline variant with the medium length shaft.

1711136757015.png

(New OEM 33311-60070 (Supersedes to 33311-60090),10/1982-9/1985, 15mm pilot journal, 28.5mm seal and high step input bearing journal. 245mm OAL)

1711136682863.png

(Used OEM 33311-60080, 10/1982-9/1985,12mm pilot journal, 28.5mm seal and high step input bearing journal. 280mm OAL)

1711139024864.png

(New Aftermarket 33311-60090, 10/1982-9/1985, 15mm pilot journal, 28.5mm seal and high step input bearing journal. 245mm OAL)

1711139419660.png

(New aftermarket 33311-60110, 10/85+, 12mm pilot journal, 32mm seal and low step input bearing journal. 280mm OAL)

1711136634471.png

(Used 33311-60111, 10/85+, 12mm pilot journal , 32mm seal and low step input bearing journal. 280mm OAL)

1711138752974.png

(New aftermarket 33311-60100/33311-60101/33311-60120 -> 33311-60121, 10/85+, 15mm pilot journal, 32mm seal and low step input bearing journal. 245mm OAL)

(PIC COMING SOON)
(New aftermarket 33311-60170, 10/90+, 15mm pilot journal , 32mm seal and low step input bearing journal. 260mm OAL)

You can determine the early vs late input shaft based on the front bearing dimension and/or the step present on the shaft that the bearing sits against. The taller step corresponds to a narrower input bearing (90363-40002), the short step corresponds to a wide bearing (90363-40035/90363-40037)

1711148652040.png
 
Last edited:
Bearing Retainer Identification:

Likewise, there are (4) different bearing retainers utilized for the different models. Early & Late as well as "short" and "long". The early and late can be identified by the ears on the upper front face. Those ears correspond to oiling ports on the back for the retainer and transmission itself.

1711148615947.png

(Early (left) without "Ears" and the late style (right) with the pronounced "ears")

Bearing Identification & Dimensions:

Early, 10/82-9/85 (90363-40002)
1711389881639.png

(90363-40002: 89.90mm OD 22.85mm H 39.95mm ID - Koyo# RCT40 Nachi# 40TRBC0727SB or NSK# 308NU32 - Cruiser Outfitters part# TCB40002

Late, 10/85+ (90363-40035/90363-40037)
1711389461161.png

(90363-40035/90363-40037: 91.90mm OD 25.4mm H 39.95mm ID - NSK 40TM05U1/35TM03NZ - Cruiser Outfitters part# TCB40035)

NOTE: The OD changes (which can also be measured on the back of the bearing retainer), the height changes (that corresponds to the wide and narrow bearing journals on the input bearing.
 
Input Seal Identification & Dimensions:
1711395346241.png

(Early 90311-28004 on left, later 90311-32013 on right)

Early, 10/82-9/85 (90311-28004) - Cruiser Outfitters Part# TR28004
1711390932726.jpeg

(OD: 43mm, ID: 28.5mm, H: 6.5mm - NOK AD1623E)

Late, 10/85+ (90311-32013) - Cruiser Outfitters Part# TR32013
1711395311395.png

(OD: 48mm, ID: 32mm, H: 6.85mm - NOK AH1893G)
 
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rick_d said:
Kurt.
THANK YOU for getting this info started. I would start w bearing retainer for “barn floor identification” from the outside. Many questions seem to be “what do i have”.

I would also add input bearing (open, black sealed, orange sealed etc) to the thread. Clarity up front for non interchangeability between old and new. Tooth count so none of the h42 gets tossed in).

Then finally what is available.
I have a hdt what do i need?
I have a 2F bellhousing and ears don’t fit?
Etc

Thus also comparison between R151 (US part) H152 (since US part why go anywhere else) and advantages and disadvantages for all three can be in a linked sticky.

Maybe this can morph into split case adaptation here or in another thread.

I know we have been fielding this question for 24 years at least (i know i answered 30 questions 2001-2003).

(I will delete this once consensus takes over)
Click to expand...

I’ve got the bearings on the table to photo, along with addition retainers. Great suggestions!

Funny, a split cast ID thread was next on my list!
 
cruiseroutfit said:
Likewise, there are (4) different bearing retainers utilized for the different models. Early & Late as well as "short" and "long". The early and late can be identified by the ears on the upper front face. Those ears correspond to oiling ports on the back for the retainer and transmission itself.

View attachment 3588654
(Early (left) without "Ears" and the late style (right) with the pronounced "ears")

The input bearing differences:

(PIC COMING SOON)
Early, 10/82-9/85 (90363-40002) on left, Late, 10/85+ (90363-40035/90363-40037) on right)

Dimensions:
90363-40002: 89.90mm OD 22.85mm H 39.95mm ID
90363-40035/90363-40037: 91.90mm OD 25.4mm H 39.95mm ID

Note the OD changes (which can also be measured on the back of the bearing retainer), the height changes (that corresponds to the wide and narrow bearing journals on the input bearing.
Click to expand...

Kurt,

Thank you very much for the info and taking the time to educate us.

As far as external identification goes, besides the early/late presence/absence of "ears" is there a correlation to posted input bearing dimentions with "short and long" varients?
 
jayp2 said:
Kurt,

Thank you very much for the info and taking the time to educate us.

As far as external identification goes, besides the early/late presence/absence of "ears" is there a correlation to posted input bearing dimentions with "short and long" varients?
Click to expand...

No, the F/H (short) and B (long) both came in early & late and thus both bearing dimensions.
 
cruiseroutfit said:
No, the F/H (short) and B (long) both came in early & late and thus both bearing dimensions.
Click to expand...

Beyond the short/long variant's spec being internal to the transmission, are there consequences to what it (long/short bearing) will properly interface with regarding engine/xfer case?

Or is the need to identify short/long specific to servicing/ordering internal parts?

Is short/long more/less desirable as far as longevity/durability?
 
jayp2 said:
Beyond the short/long variant's spec being internal to the transmission, are there consequences to what it (long/short bearing) will properly interface with regarding engine/xfer case?

Or is the need to identify short/long specific to servicing/ordering internal parts?

Is short/long more/less desirable as far as longevity/durability?
Click to expand...

Sorry, I'm not tracking. The input shaft and matching bearing retainer and bearing are 100% related to the transmission they will work with. They also have to be matched to early or late internals but you can swap an early 3B input shaft on an early 2F H55F, if you have the bearing retainer to go with it.

The need for identifying is knowing what transmission one has for use, rebuild, parts, etc.

The transfer case is on the output shaft, not covered by this article. For the most part are split t-case variants (I've identified 63 different ones and I'm sure I'll find more) :D

1711386663985.png
 
cruiseroutfit said:
Sorry, I'm not tracking. The input shaft and matching bearing retainer and bearing are 100% related to the transmission they will work with. They also have to be matched to early or late internals but you can swap an early 3B input shaft on an early 2F H55F, if you have the bearing retainer to go with it.

The need for identifying is knowing what transmission one has for use, rebuild, parts, etc.

The transfer case is on the output shaft, not covered by this article. For the most part are split t-case variants (I've identified 63 different ones and I'm sure I'll find more) :D

View attachment 3590834
Click to expand...
Sorry Kurt, I suspect I may have misread your post below

cruiseroutfit said:
Likewise, there are (4) different bearing retainers utilized for the different models. Early & Late as well as "short" and "long". The early and late can be identified by the ears on the upper front face. Those ears correspond to oiling ports on the back for the retainer and transmission itself.
Click to expand...

the short/long pertaining to the bearing retainer and early/late (ears/absence of ears)

If you want to delete my question/posts pertaining to this to keep the thread tidy please do
 
jayp2 said:
Sorry Kurt, I suspect I may have misread your post below



the short/long pertaining to the bearing retainer and early/late (ears/absence of ears)

If you want to delete my question/posts pertaining to this to keep the thread tidy please do
Click to expand...

No worries. I'm going to make a chart similar to the one we use in-house that hopefully clarifies more!

1711390109455.png
 
@rick_d & @jayp2 - I added the bearing info and some availability info. When I'm back at my desk in the shop I'll continue fleshing out additional information.
 
I need to spend a bit more time with the dates as the cut-off isn't exactly 9/85 - 10/85 and in some cases (such as a BJ74) would have gone to the late parts as soon as 11/84 on a MY 85. That will get complicated as we know the fuzzy area that exists with those dates, different markets, etc.
 
BJ74s are good for that old Fuzzy Feeling... :grinpimp:
 
God bless you, Kurt. Sticky this, please.
 
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