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.
I have a 229 A in my Grand Wagonner fron -84 (with 360 engine)
may need new transfer case or transfer case controller
T-Case is most likely an NP229
the Jeep Grand Wagoneer was last made in 1991. do you mean the Jeep grand Laredo or Jeep grand Cherokee?
Four door models include the Wagoneer, Cherokee, Grand Wagoneer, Grand Cherokee, Liberty, Compass, Patriot, Wrangler.
If you are refering to the belt tensioner. I have not seen one on a grand wagoneer with a 360.
according to the owners manual for my 1987 Grand Wagoneer, it holds 20.3 gallons
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.
Transmission: a 3 speed Chrysler 727 Torqueflite automatic Transfer Case: New Process model 229 (NP229) (this is assuming it has the AMC 360ci V8)
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.
not from the factory
the v8 is 14.0 qts