Spicer supplied T18 Transfer Case to Willys. This transfer case was of 2-speed design and had a high gear (1 : 1) and a low gear (2.46 : 1) ratio. These transfer cases were fitted on all 4WD versions of CJ2A, CJ3A, CJ3B, CJ4, CJ4A, Station Wagon, FC150, FC160, FC260, CJ500D, NC670. It is still getting manufactured at Mahindra plants and are fitted in 4WD versions of the Mahindra Pikup, Bolero Maxitruck, Bolero Camper as well as the Roxor in the US.
- Production – 1949 and continuing till date
- Plant(s) – Mazagaon, Ghatkopar, Kandivali
The T18 transfer case had a sliding spur gear low gear and a dog clutch to engage 4WD. The vehicle needs to come to a standstill for shifting. It also had a provision to fit a power take-off unit.
Factoid – The interlock system in the transfer case does not allow the possibility of a 2WD Low mode. A small interlock plunger between the two shift rails inhibits this operation. However coffee estate owners in Coorg know how to get “2WD Low” without meddling with the transfer case.
The original design of the T18 transfer case remains same even today except the shifting patterns have changed. Original shifting pattern had 2-levers which then moved to a single lever U-Shift pattern and finally to a single lever straight line shift pattern.
The Museum by Samuel Premkumar 
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