We offer Mark’s 4wd adapter kit to allow you to adapt the late model GM 4L80E to Landcruiser HF2A transfer case. The adapter kit includes an adapter housing, extension housing, coupler shaft, oil seal, fastening hardware, and adapter instructions. This kit is machined to accept the FJ80 transmission mounting rubber. The crossmember mounting holes may need to be slotted to allow it to be moved rearward slightly. The transfer case shifter mounts to the top of the adapter housing. The bracket provided in the kit allows for the HI/LOW lever to come though the original hole.
This assembly is used with the1990-2002 HF2A Transfer Case that was previously used with the Landcruiser automatic transmission.
The adapter kit is designed for exclusive use with the GM 4L80E 4wd. A GM 4L80E output shaft speed sensor must be used. This transmission is similar to the TH400 except that it is electronically controlled and has an overdrive. This transmission does not use a reluctor ring like the 4L60E. The 4L80E transmission is normally equipped with an internal reluctor ring on both the transmission input shaft and output shaft. The computer takes both of these readings in for the proper shifting and operation of this transmission. We have always ignored the reluctor ring requirement for this transmission since it is internally regulated. We have now learned that the rear reluctor ring is not always installed into the transmission. The basic rule of thumb is 4WD transmissions up to 1996 should have a rear reluctor ring in the main transmission case. All 2WD transmission should have the rear reluctor in the main transmission case, and the 1997 & newer 4WD 4L80E transmissions have a sensor provision; however, the reluctor ring in the transmission is left out. The tailhousing bolt pattern is the same as the TH400, but indexed with a different diameter. There are several lengths of the stock 2WD transmission output shaft and only one length of the 4WD. When designing our kit, we standardized off of the 4WD output shaft. The 1st gear ratio is 2.482; 2nd 1.482; 3rd 1.1, and a 4th gear ratio of .75. Before installing your transmission make sure it is equipped with the rear reluctor ring.