Jeep transfer cases have a round red and silver identification tag on the back side. It will show the part number, gear ratio, date code and other information. Common Jeep transfer cases are 209, 231, 242. Look for a three digit number that may or may not be preceded by or followed by some additional letters like NV, NP, or J.
Transmission: a 3 speed Chrysler 727 Torqueflite automatic Transfer Case: New Process model 229 (NP229) (this is assuming it has the AMC 360ci V8)
The 1989 Jeep Grand Wagoneer is equipped with the Quadratrac transfer case, which is a full-time four-wheel-drive system. This transfer case uses a center differential to allow for power distribution to all four wheels, providing improved traction in various driving conditions. It features a low range for off-road capabilities, making it suitable for both on-road and off-road use.
may need new transfer case or transfer case controller
I have a 229 A in my Grand Wagonner fron -84 (with 360 engine)
T-Case is most likely an NP229
its the borg warner 1350
On a Grand Wagoneer, the 4x4 vacuum lines are typically located near the transfer case and the front axle. These lines are part of the system that engages the front axle when 4WD is activated. You can usually find them running from the vacuum actuator on the transfer case to the front differential. It's important to check for any leaks or damage in these lines to ensure proper 4WD operation.
If the shift lever on the floor won't move to engage there is most likely a linkage problem. If the linkage seems to move and you shift the lever under the dash from 2wd to 4wd and the transfer case does not engage look for a vacuum problem. the lines can be very brittle and break easily. There is a vacuum motor on the transfer case that must work in order to engage the 4wd. if all of these seem to work then the problem is likely to be internal.
If you are talking about the transfer case on the transmission....it would be any brand of 90 weight oil.
Fill plug is located on the center rear of the transfer case
22
Transfer case gets ATF (auto trans fluid) Axles get 75w90 or 80w90 gear oil.