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Are they both the same trans? There are 3 speeds and 4 speeds. Swapping between them would be a ton of work. The 3 speeds are dead nuts simple. All hydraulic control with just a single solenoid for 4WD. Send 12V to it for 4WD. The 4 speeds are electronic control. You have to do a ton of harness work, swap the dash etc, to get a 4 speed in a 3 speed car.

Yes. Off the top of my head: Trans Driveshaft Carrier Bearing Diff fuel tank Diff mounts axles hubs shifter wiring

Pretty simple swap. Best if you can get both cars in the same place.

Swapped out the left front axle with a spare. No more clunking in turns! Wheel bearing was ok. Just because, I greased the pins of the left front brake, pads looked ok. Nothing obvious was loose. Axle goes back to rebuilder for another go.

Torque bind. Change the fluid and ensure all 4 tires are the same diameter (size and tread wear/depth) immediately. If this is an initial onset, changing the fluid 2-3 times can alleviate it. If it needs repair there are two causes: 1. install FWD fuse - if this works then the duty solenoid is probably fine and the clutches need replaced. 2. if the FWD fuse doesn't put the car in FWD and it still binds then the Duty C solenoid is bad. usually best to replace solenoid and clutches at the same time. The transmission doesn't need to come out to repair - they're all accessible from under the vehicle by pulling the rear extension housing case off which isn't that hard. If the FWD fuse works then a work around is to install a switch that toggles between the FWD fuse and no FWD fuse so that you can have either "FWD" or " 'locked' 4WD". Then just keep it in FWD all the time unless you're offroad or in snow. I've done it before and it's a beautiful fit in some situations that don't warrant the full on repair and makes the car 100% functional for $5 in parts and very little time of some simple wiring. Or you can just embrace the high maintenance an leave the FWD fuse in all the time and pull it when 4WD is needed. But if you need it often that's going to be awfully annoying.