early mid 90s is the np241 you want to look for, will have fixed yoke front output like jeep cases, rear is still slip yoke. that's what I'm getting for my rear case and those years will be manual shift
Well, of course it's going to be manual shift. It ends in a 1.
In "case" nobody knew this...(see what I did there?
)
NP/NVG - New Process Gear/New Venture Gear, that's who makes them.
2 - that means it's 2 speed
4 - denotes relative case strength (i.e. - a 271 is stronger and larger than a 241)
1 - means it's manual shift, part time 4wd
First Number: The number of speeds. If it is a standard high range, neutral, low range transfer case, the number is 2. If it is a single speed with no low range, like a 133, it gets a 1.
Second Number: The size of the case, physically, and has a lot to do with how strong the case is. The case sizes current are: 2, 3, 4, 6, 7. With 22X being the smallest and 27X series being the largest.
Third Number: The third number tells you what type of 4wd system is in the transfer case. Current systems are designated by: 1, 2, 3, 4, 6, 7.
1 - Part time transfer case, manually
shifted. When in 4wd, front and rear driveshafts are locked together. If its a 2 speed tcase, then it would have 4 positions, 2wd, 4wd, N, 4 low
part-time . These cases are shifted by a
lever on the floor. Example: 231, 241, 261, 271.
2 - Part time transfer case plus Full time,
manually shifted. A geared differential is used to allow the driveshafts to turn at different speeds, while still applying torque. Some are 4 position and some are 5. 4 position have 4FT,
4PT, N, 4LPT. 5 position boxes get a true 2wd where the differential is bypassed and all the torque goes to the rear driveshaft. These cases are shifted by a lever on the floor. Example: 242, 242HD, 242AMG
3 - Part time transfer case, electrically
shifted. Everything is the same as a -1-, except an electric motor is used to shift the transfer case. Instead of a lever on the floor, you have a button or a dial on the dash. Example: 133, 233, 243, 263, 273.
4 - Part time transfer case plus Full time,
electrically shifted. Everything is the same as a -2-, except an electric motor is used to shift the transfer case. Instead of a lever on the floor, you have a button or a dial on the dash. Example - 244
6 - Active on demand System. Front and rear axles are constantly monitored electronically to detect any differences in speed due to wheel slippage. When a speed difference is detected, a computer
signals the transfer case clutch pack to engage. Torque transfer is transparent to the driver, meaning the driver can't tell it happened. Basically, AutoTrac. Example: 226, 236, 246
7 - Progressive on demand system. The vehicle operates in 2WD. When traction is lost by one of the driving wheels, power is automatically transferred to the other axle.
Example: 247
This doesn't apply to older stuff like the NP203, NP205, or NP208, but those are pretty easy to identify.
So what is the transfer case going in? That'll help determine what you need to pull one from or look for. What transmission is it being bolted to? You can always swap inputs around between cases. A lot of parts interchange netween NP/NVG cases, but some are clocked a little differently than others and/or the bolt pattern on the mating flanges are spaced out differently.
