What is a Dana 20 transfer case?
The Dana 20 transfer case is a medium-duty, gear-drive unit that was manufactured from about 1962 to 1979. It is a part-time, manual-shift t-case that was found in Jeep, GM, Ford, and some International Harvester vehicles. The cast iron housing helps contribute to its reputation as a robust and reliable transfer case.
How do you calculate crawl ratio?
To figure out a crawl ratio you need to know the transmission first gear ratio (TR), transfer case low gear ratio (TCR), and axle gear ratio (AGR). The formula is simple once you have those numbers; Crawl Ratio = TR x TCR x AGR or use an online calculator like the one on Crawlpedia.
How do I know if I have a Dana transfer case?
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. It also has 2 shifters one for high and low, the other to engage/disengage 4-wheel drive. There are 5 different varieties of the Dana 18 transfer case.
What’s a good crawl ratio?
An ideal crawl ratio for general-use 4x4s is typically in the 50:1 range. Those who tackle more difficult terrain will strive to obtain at least a 100:1 ratio.
What years did Ford use NP205?
Ford used driver-side front outputs and a divorced NP205 in its trucks from about 1972 to 1977, then changed to a six-bolt pattern married NP205 with a 31-spline female input through 1979.
How strong is a Dana 300 transfer case?
Broken cases or other components are only very rarely seen. The 300 uses all helically cut gears. It uses a large 1.25″ intermediate shaft. The Dana 300 is strong enough from the factory to handle even the most potent engines and situations.
What vehicles use a NP231 transfer case?
Since 1988, the NP231 has been the “Command Trac” transfer case used in the XJ Cherokee, MJ Comanche, and YJ Wrangler. It has been the “Command Trac” transfer case in the ZJ Grand Cherokee since its introduction.
What kind of gear does a Dana 20 have?
The Low20 for manual transmissions kit uses a six-spline input gear for Dana 20s with MANUAL transmissions. The kit converts the stock 2.03:1 to 3.15:1 for improved rock crawling performance. This five-gear kit fits 1963 through 1979 CJs, Jeepsters, Jeep trucks, Wagoneers, and 1972 through 1979 Scouts.
Is the Dana 20 a good transfer case?
The Dana 20’s design was outstanding and remains one of the strongest and most refined of all the popular transfer cases. You can’t fully know the Dana 20 without knowing its great predecessor, the Dana 18.
Can a Bronco sliding gear be used in a Dana 20?
Of note, it is possible to swap a Bronco sliding gear into the Jeep or IH Dana 20’s – along with Model 18 gears – to acheive a 2.46:1 Low. A few Ford applications used a single speed variant of the Dana 20; the Dana 21. They are similar in construction to the Jeep Dana 21, but having a bolt pattern similar to the Bronco Model 20.
What is the difference between Dana 20 and 26 spline shafts?
The 10 spline vs. 26 spline shafts show no greater nor less tendency towards breakage, as the shaft diameters (the real measure of strength, not spline count) are very similar. The gearset in the Dana 20 is strong, but unbalanced. The front seat is helical and the rear set is spur cut.