Know Your T-Case With so many transfer cases in use on a large number of 4x4s, it's difficult to accurately - and thoroughly - list every T-case manufactured and which 4x4s used any particular T-case, especially since many transfer cases were used in multiple applications, such as the use of the New Process 203 on fullsize SUVs and trucks built by Dodge, Ford, and GM. To keep this overview within reasonable limits, we've focused on the most popular transfer cases used on 4x4s built during the '60s, '70s, '80s, and '90s. Here's a condensed rundown of the specs on popular 4x4 transfer cases.
Model: New Process 203 Low-range: 2.00 Internal drive: Chain Applications: '71-'80 Chevy/GMC K-Series trucks, Blazers, and Suburbans; '74-'76 Ford F-150 and Bronco; '71-'80 Dodge Ram and Ramcharger Details: Uses internal differentials for full-time operation; cast-iron case
Model: New Process 205 Low-range: 1.98 Internal drive: Gear Applications: '71-'80 Chevy K-Series trucks, Blazers, and Suburbans; Dodge Ram trucks and Ramchargers; '76-'79 Ford Bronco and F-150 trucks Details: NP 205 still being used on heavy-duty Dodge trucks; cast-iron case; part-time operation
Model: New Process 208 Low-range: 2.61 Internal drive: Chain Applications: '80-'87 Chevy K-Series trucks, Blazers, and Suburbans; '80-'87 Dodge Ram trucks and Ramchargers; Jeep fullsize trucks and Wagoneers; '80-'87 Ford F-150 trucks Details: Aluminum case; part-time operation
Model: New Process 241 Low-range: 2.72 Internal drive: Chain Applications: '88-and-newer Chevy K-Series trucks, Blazers, and Suburbans; Dodge Ram trucks and Ramchargers. Details: Aluminum case; part-time operation
Model: New Process 231/New Venture Gear 231 Low-range: 2.72 Internal drive: Chain Applications: '88-and-newer Jeep Cherokee, Grand Cherokee, Comanche, and Wrangler Details: Aluminum case; part-time operation
Model: New Process 242/New Venture Gear 242 Low-range: 2.72 Internal drive: Chain Applications: Jeep Cherokee and Grand Cherokee Details: Aluminum case; part-time operation
Model: New Process 207 Low-range: 2.61 Internal drive: Chain Applications: Jeep Wrangler and Cherokee; '83-'87 Chevy S-Series Details: Part-time operation; aluminum case
Model: Dana 300 Low-range: 2.62 Internal drive: Gear Applications: '80-'86 Jeep CJ Details: Cast-iron case with aluminum tail section; single shift lever
Model: New Process 233 Low-range: 2.0 Internal drive: Chain Applications: '94-and-newer Chevy/GMC S-Series Details: Aluminum case; part-time operation
Model: Dana 20 Low-range: 2.03 Internal drive: Gear Applications: '72-'79 Jeep CJ; '63-'79 Jeep fullsize trucks; Chevy/GMC K-Series trucks and Blazers; '66-'77 Ford Broncos Details: Part time operation; cast-iron case
Model: Spicer 18/Dana 18 Low-range: 2.42; (5th generation Dana 18 has a 2.46 ratio) Internal drive: Gear Applications: '41-'71 Jeep CJ, pre-'65 Jeep fullsize trucks Details: Cast-iron case; part-time operation
Model: Borg-Warner 1345 Low-range: 2.72 Internal drive: Chain Applications: Certain '80-'88 F-150/F-250 Details: Aluminum case; integral oil pump; part-time operation
Model: Borg-Warner 1350 Low-range: Internal drive: Chain Applications: Ford Ranger and Bronco II Details: May be equipped with Touch-Drive electric shifting; aluminum case; part-time operation
Model: Borg-Warner 1356 Low-range: 2.69 Internal drive: Chain Applications: '88-and-newer Ford F-150 trucks Details: Magnesium case; manual or electric shift; part-time operation
Model: Dana 21 Low-range: None; the Dana 21 is a single-speed T-case Internal drive: Gear Applications: '69-'76 Ford F-100 trucks Details: Cast-iron case; single shift lever; part-time operation
Model: Dana 24 Low-range: 1.86 Internal drive: Gear Applications: '69-'73 Ford F-250 trucks Details: Divorce-mounted transfer case, separate from transmission; cast-iron case; part-time operation
Model: Jeep Quadra-Trac Low-range: 2.57 Internal drive: Chain Applications: '72-'79 Jeep trucks equipped with TH400 automatic transmissions Details: Aluminum case; full-time operation
Model: Land Rover LT230R Low-range: 3.32 Internal drive: Gear Applications: Pre-'92 Range Rover, Defender, and Discovery Details: Early-model LT230Rs use central locking differential; late-model LT230Rs use viscous coupling center diff