Borg Warner 1305/1339 QuadraTrac Transfer Case Specs & Info
This was the optional full-time chain drive transfer case found behind the AMC TH400 automatic between 1973 and 1979. It was the first Jeep transfer case to be made of aluminum and to be chain-driven. These transfer cases have their share of problems, many related to the fact that no provision was made to compensate for stretch of the steel drive chain. This unique transfer case had an integrated differential that, like an open axle, flowed the power to the axle with the least traction. A driver operated vacuum switch allows this differential to be locked at will.
The basic version of the QuadraTrac is the BW 1305. This transfer case did not have a low range. However there was an optional low range of 2.57 for the QuadraTrac available, being attained through a bolt on planetary reduction unit. This unit as a whole is designated as the BW 1339. Domain: http://www.novak-adapt.com
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Submitted by Code3TJ on 08/02/04
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Building A Better Dana 20
The Jeep Dana 20 is one of the most common transfer cases around. It's cast iron housing and all gear drive make it strong, and the short tail shaft maximizes the length of the rear driveshaft. It also hangs down at a less steep an angle than a Dana 300, conserving valuable ground clearance. The down side to this transfer case is the 2.03:1 low range. A combination of gears from a Jeep Dana 18 transfer case and an older Early Bronco Dana 20 put inside a Jeep Dana 20 case can make for an almost painless conversion to a 2.46:1 low range. Domain: http://www.off-road.com
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Submitted by Code3TJ on 08/02/04
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Changing Your Transfer Case Fluid
How to change the fluid on your Jeep's NP231J transfer case. Domain: http://jeep.us41.org
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Submitted by Code3TJ on 11/29/05
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CJ7 NV4500 Conversion
Rebuilding a GM NV4500 transmission and swapping it into a CJ7. This transmission has the coveted 6.34:1 first gear. The author describes the install of a new mainshaft and bellhousing to mate it to his Jeep. Domain: http://www.4x4wire.com
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Submitted by Code3TJ on 08/02/04
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Cleaning an AW4 Neutral Safety Switch
If the reverse lights on your XJ have stopped working, or only work some of the time, your Neutral Safety Switch (NSS) could need to be cleaned. The NSS is what controls your reverse lights as well as what keeps the engine from being started in any gear other that Park or Neutral (hence the name). Having the dealer replace the NSS will cost you between $300-$400, so doing this yourself can save you a bundle. Domain: http://jeepin.com
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Submitted by Code3TJ on 07/16/04
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Clutch/starter interlock
On the Jeep TJ, Chrysler designed a clutch/starter interlock to make it necessary to push in the clutch before the starter will engage. It is good sometimes to be able to start your Jeep with it in gear. On 1998 and later TJs, you can pull a fuse to disable this "feature". Unfortunately, on the 1997 model, there is no such fuse. There is, however, a solution for 97 owners. Just in front of the drivers door on the inside of the Jeep, there are 2 plugs. One of the plugs is for TJs with an automatic transmission and the other for TJs with manual transmissions. To disable the clutch/starter interlock, unplug the connector from the forward plug (manual transmission plug) and insert it in to the rearward plug (automatic transmission). Now the Jeep thinks it has an automatic transmission, therefore bypassing the clutch/starter interlock. Domain: http://homepage.mac.com
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Submitted by kizer on 11/16/03 Edited
01/09/04
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Crawl ratio calculator
Use this online calculator to figure out your final crawl ratio. It includes the standard ratios for most of the popular Jeep axles, transmissions and transfer cases. Domain: http://www.californiajeeper.com
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Submitted by Code3TJ on 04/14/04 Edited
04/16/04
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Dana 20 Shifter Assembly Diagram
An exploded view of the Dana 20 transfer case shift lever assembly. Requires Adobe Reader. Domain: http://www.earlycj5.com
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Submitted by Code3TJ on 10/20/05
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Dana Model 18 Transfer Case Rebuilding Guide
This guide is for the Dana/Spicer Model 18 transfer-case. After I started this project, I discovered that the repair manual's instructions for the transfer-case were adequate for the experienced rebuilder. However, they left room for inexperienced people to commit errors. This rebuild guide follows the basic instructions from the book with added steps and tips. I also included instructions for removing the WARN Overdrive. This guide is divided into 4 sections, Disassembly, Inspection, Assembly and Troubleshooting. Domain: http://www.willystech.com
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Submitted by Code3TJ on 07/26/04
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Dana Spicer Model 18 Transfer Case Specs & Info
Probably the most famous and recognizable transfer case of all the four-wheel-drives is the Jeep Spicer Model 18, also known as the Dana 18. Introduced in 1941 in the Willys MB and Ford GPW, its production spanned thirty years. The Model 18 has a cast iron case and is gear-driven. The most obvious sign of the Model 18 is the passenger side offset of both the front and rear output yokes. The Model 18 transfer case is the only standard American made unit with such a distinction. Domain: http://www.novak-adapt.com
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Submitted by Code3TJ on 08/02/04
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Dana Spicer Model 20 Transfer Case Specs & Info
The successor to the Model 18 is the Jeep Spicer Model 20. Its case is of iron and it is gear driven. It shares many similar features and even some parts interchangeability with its predecessor. It, however, is differentiated by its centered rear output yoke, with only the front output yoke being offset to the passenger side. This "Silent Type" transfer case was so called because power flow to the rear wheels was direct. The Model 20, unlike the 18, has a 4" locating bore for all years and applications.
Domain: http://www.novak-adapt.com
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Submitted by Code3TJ on 08/02/04
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Dana Spicer Model 300 Transfer Case Specs & Info
The last of the great Jeep gear-driven, iron-cased transfer cases, and perhaps the finest incarnation of them, was the Model 300, introduced in the 1980 model year. It is found in CJ Jeeps only.
This transfer case combines the strength of the Model 18 with the efficient design of the Model 20 into a compact, sturdy and serviceable unit. The 300, like its predecessors, had a passenger side front output yoke. The unit has a respectable gear ratio of 2.62:1 and runs direct in high. Domain: http://www.novak-adapt.com
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Submitted by Code3TJ on 08/02/04
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Dana300 shift patterns
The shift patterns of the twin-stick shifters on the Dana 300 transfer case... Domain: http://www.sierrajeep.com
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Submitted by kizer on 02/04/04 Edited
07/26/04
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Dana300 Twin Stick Shifter Design
In a continuing effort to bring great ideas to everyone, we would like to show you how you can make your own twin stick shifter for your D300 for little or no cost. This setup will allow you to create a nearly stock looking installation but having the advantage of a twin shifter. (Please disregard the rough look of the shifter shown here. The shift boot was removed to show the setup and parts more clearly. Installation of the boot makes for a nice clean look.) Domain: http://7slotgrille.com
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Submitted by kizer on 01/14/04 Edited
07/26/04
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