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.
View attachment 3588545
(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.
View attachment 3588501
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.
View attachment 3588549
(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)
View attachment 3588548
(Used OEM 33311-60080, 10/1982-9/1985,12mm pilot journal, 28.5mm seal and high step input bearing journal. 280mm OAL)
View attachment 3588566
(New Aftermarket 33311-60090, 10/1982-9/1985, 15mm pilot journal, 28.5mm seal and high step input bearing journal. 245mm OAL)
View attachment 3588570
(New aftermarket 33311-60110, 10/85+, 12mm pilot journal, 32mm seal and low step input bearing journal. 280mm OAL)
View attachment 3588547
(Used 33311-60111, 10/85+, 12mm pilot journal , 32mm seal and low step input bearing journal. 280mm OAL)
View attachment 3588565
(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)
View attachment 3619894
(New aftermarket 33311-60170, 10/90+, 15mm pilot journal, 32mm seal and low step input bearing journal. 260mm OAL)
