This Jeep transfer case built by Borg Warner is commonly referred to as the Quadra-Trac.
JEEP VIN DECODER JK FULL
Dana 20 transfer cases were found in the following Jeep vehicles: 1962-1979 full sized Jeep trucks, 1967-1973 Commandos, and 1972-1979 CJ-5, CJ-6 and CJ-7. Dana 20 transfer cases are very strong, and there are numerous aftermarket parts available to increase its strength. Because of the straight through design, the Dana 20 also tended to wear less than the Dana 18. It was referred to in its early years as a “silent type” case. The centered rear output allowed for a straight through design, and made the Dana 20 much quieter than the Dana 18 it replaced. The Dana 20 also differs in that it has a 2.0:1 low range and single shift lever. It shares the same cast iron case as the last versions of the Dana 18 with the 4″ bore and passenger front output but has a centered rear output. It has also seen action in Scouts, early Bronco’s and even some early Chevy Blazers. The Dana 20, a replacement for the Dana 18, was first used in Jeep trucks in the early 1960’s but didn’t arrive in the CJ’s until 1972.
The Dana 18 began its life during WWII in the MBs and GPWs and continued service until 1971 in all varieties of Jeeps both Military and civilian. The overdrive also adds another shifter to the mix and makes it easy to spot a Dana 18 with the overdrive unit. Many of the Dana 18 transfer cases were also fitted with the Warn overdrive attached to the rear via the PTO port. Dana 18’s are typically noisy transfer cases as the offset rear forced all the gears to spin while in 2wd or 4wd. The early versions had a 3″ locating bore in the rear while the later cases had a 4″ locating bore.
The earliest versions have a 2.98:1 low range and smaller intermediate shaft while the later versions have either a 2.42:1 or 2.46:1 low range and larger intermediate shafts. There are 5 different varieties of the Dana 18 transfer case. It also has 2 shifters one for high and low, the other to engage/disengage 4-wheel drive. The Dana 18, as it is commonly referred, is easily identified as it has both front and rear outputs offset to the passenger side of the Jeep. This information was compiled to give you some background on a few of the more popular transfer cases, and help you identify them should you stumble across one in a wrecking yard. There is a lot more information available about each of the transfer cases listed below, as such this article is written to give you an overview of each. Note: This article does not cover every transfer case ever installed in a Jeep, but instead highlights the most popular used throughout the years.