1990 E4wd Qestion
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Senior User
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From: Liverpool, NY
1990 E4wd Qestion
hi - the u joints on my front driveshaft need to be replaced, but if i take the shaft out, can i still drive the vehicle? I mean, i would have to take out the fuse and it would ride like a 2wd right?
..and just when i thought i knew everything.
-Matt
..and just when i thought i knew everything.
-Matt
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Joined: Oct 2004
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You should NOT plan on driving the van with the front shaft removed. The T/C clutch will be cycling on and off constantly because it will think the front wheels are slipping. Also, you will have no PARK. The van will just roll away like it is in neutral. If you leave the E4WD fuse IN, you will be able to move the van around in a parking lot or something. If you take the fuse OUT, the van will not move at all. Remember, with that front shaft out you will need to set the emergency brake to keep the van from rolling.
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From: Rochester, NY
This isn't like truck 4WD system. The AWD system uses a center differential with an electonically controlled clutch to lock it up as needed. But since the diff is there, it sends power to both axles all the time. If one axle is disconnected, the center diff will spin up much like an open diff in an axle will if a tire is on ice. The diff needs to have some resistance on both outputs in order to send torque to them, usually from the tire to road friction. But if you unhook the driveshaft, you lose that completely on the center diff's front output. The fuse would only shut down the lock clutch; it would have no affect on the diff itself.
Because of that, like Aerostar1 said, when you put it in park you will lock the diff input from turning, but not the outputs. If the diff can free-spin since its unhooked on one side, then there's nothing to stop the rear axle from turning.
Because of that, like Aerostar1 said, when you put it in park you will lock the diff input from turning, but not the outputs. If the diff can free-spin since its unhooked on one side, then there's nothing to stop the rear axle from turning.
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Great explanation Torsen Rick. Another analogy for how the center differential works is to think of it as a Teeter-totter. You got a fat kid (rear wheels, 66%) on one end, and a skinny kid (front wheels, 33%) on the other end. If one kid jumps off, the Teeter-totter(center differential) doesn’t work. In this case, you are taking the skinny kid off. The fat kid (sorry, politically incorrect terminology, the calorically challenged kid) will not be able to teeter-totter by herself.
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From: Liverpool, NY
i was just wondering since the front shaft needs u-joints if it was possible to drive it back and forth to work - but since this is not possible(for stated reasons), the van will have to sit.
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Although I can't recomend it, I was able to limp to a garage where my work was done with the cluch locked-up. Although the front shafts were still in place, one CV had desinigrated and that shaft was turning freely. I only had a mile or so to go and I kept it under 10 MPH.
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From: Liverpool, NY
wow - my dad and i got the front shaft out thins morning by cutting it(u-joints were rusted in place). Also I noticed the engine pinging. It doesn't affect the ride but boy does it sound awful. Dad says it's a bearing going somewhere but i think it's a lifter. Anyone got a guess?
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I think it is either a cracked exhaust manifold, or carbon build up in the engine. Decarbon it with Seafoam, and use 87 octane gas, no higher. I would doubt it is a bearing unless you have let the engine run out of oil.
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