GM 4L80E 4 Speed Automatic Transmission to the August 1980-1990 Land Cruiser 19 Spline Transfer Case Adapter Kit

The 4L80E adapter to the Land Cruiser 19 spline transfer case is 3.19” in length. And the overall length of the transmission and adapter is 29.19”. The adapter material is 356 T6 heat treated aluminum alloy. The adapter kit includes an adapter housing, adapter plate, 19 spline spud shaft, sealed bearing, gaskets, fastening hardware, and adapter instructions.

 

 

This adapter assembly fits August 1980 to 1989 transfer cases. The transfer case design was changed to a split-case design configuration with a 19 tooth internal spline on the input gear. 

 

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.