Transfer Case Identification Chart for 1941-1979 Jeep Vehicles
The Dana Spicer transfer case, Model MB dual lever shift control, can be identified by the small intermediate gear idler shaft that is only .750" in diameter. This MB transfer case is marginal for V8 power, so we suggest that you limit your engine size to a V6 or change the transfer case to the later model Dana 18. This transfer case uses an input gear with 1-3/8" 6 spline.
These vehicles were equipped with the Dana Spicer Model 18 and 20. These transfer cases have a four position shifter that provides two gear ratios in 4WD, one ratio in 2WD, and a neutral position. Four wheel drive low provides a reduction ratio of 2.03:1 on the Dana 20, and a 2.46:1 on the Dana 18. The controls varied from a dual lever design to a single lever on the later models. The bolt pattern on the input side has always remained the same, so transfer cases can be interchanged between years - with some exceptions. These exceptions include: the indexing or alignment bearing retainer that protrudes from the back side of the transmission. Another difference is that the Model 20 transfer cases have the power to the rear axle directly in line with the transmission, while the Dana 18 has the power offset to the passenger side.
Dana Spicer 18 & 20
6 Spline Transfer Cases
On all Jeep vehicles 1941-79, equipped with the Dana Spicer 6 spline transfer case, you will have the largest selection available for transfer case adapters. These adapters are for replacement of Jeep transmissions that have a 6 spline input gear to the transfer case. The Jeep transmission model numbers are T84, T90, T86, T85, T89, T98A, T18, T15, and T150. Not all of the transmission options are compatible for use with short wheel base vehicles.
Dana Spicer 18 & 20
10 Spline Transfer Cases
On all Jeep vehicles 1969-71, some were equipped with the Dana Spicer 10 spline transfer case.
Dana Spicer 20
15 Spline Transfer Cases
On all Jeep vehicles that were equipped with the AMC TH400 automatic transmission, you will find that they used a special input gear to the transfer case that was held in place with a snap ring and splined to a special coupler shaft with 15 teeth.
Borg Warner Quadra-Trac
This is a chain-driven transfer case used with the AMC Turbo 400 automatic transmission. The Turbo 400 has a 10 spline super-long output shaft that simply slides into the input gear of the transfer case.
The following parts require additional handling charges due to their large size or
weight: wheels, tires, full suspension lift kits, oversized bumpers, tire carriers, body tubs, hard tops
and cargo racks. The following parts do not qualify for free shipping: Oversized items and items
delivered by truck freight, as well as prior purchases and returns.
Jeep Parts & Jeep Accessories Take your Jeep to the next level with the parts found on our site. We are a leading Jeep accessories retailer, providing performance products for our customers. We work hard to give you the best information to turn your vehicle into a top-notch ride. Whether you are looking for 4wd suspension parts & accessories or want improved Jeep performance, we have the parts & Jeep accessories you need.
The terms Quadratec and Essentials are Registered Trademarks of Quadratec Incorporated, Registered in U.S. Patent and Trademark Office. All manufacturers names, numbers, symbols and descriptions are used for reference purposes only, and it is not implied that any part listed is the product of these manufacturers or approved by any of these manufacturers.
*Jeep, Wrangler, Rubicon, Renegade, CJ, Quadra-Trac and the Jeep Grille Design are registered trademarks of FCA (Fiat Chrysler Automobiles). Quadratec, Inc, has no affiliation with FCA. Throughout this website and catalog the terms Jeep, Wrangler, MOPAR®, & Rubicon are used for identification purposes only. Geo is a registered trademark and Tracker is a registered trademark of the General Motors Company. Sidekick and Samurai are trademarks of Suzuki Motor Corporation. Amigo is a product of Isuzu Motors Limited. Chevrolet, the Chevrolet Emblem, S Series, GMC, GMC Truck, Chevy, Vortec and Sonoma are registered trademarks of the General Motors Company. Expedition, F-Series, F-150, F-250, F-350, Super Duty and Flare Side are registered trademarks of the Ford Motor Company. All other marks, names, and logos mentioned on this web site are the property of their respective owners.
Throughout this web site all the preceding marks & logos are used for identification purposes only. Quadratec has no affiliation with the FCA, MOPAR®, General Motors Company, Ford Motor Company, Suzuki Motor Corporation or Isuzu Motors Limited. It is not implied that any part listed is a product of, or approved by FCA, General Motors Company, Ford Motor Company, Suzuki Motor Corporation or Isuzu Motors Limited.
Quadratec, Inc. is sometimes mis-searched as Quadartec and Quadratech, we have no affiliation with either. 
* Free Shipping Special Offer Details
To qualify for FREE shipping the parts on an individual order must meet a combined total value of $75 or more. Customer must select Standard Shipping in the checkout and ship to an address in the contiguous 48 United States. Some parts require additional handling charges due to their large size or weight: including wheels, tires, full suspension lift kits, oversized bumpers, tire carriers, body tubs, hard tops, cargo racks, winches and hitches. Oversized items, items that are delivered by truck freight, prior purchases and returns do not qualify for free shipping.