Clunk on full steering lock in low range has center diff lock
I would be looking at the ling pin of front suspension set up for the clunk on full steering lock If you have a live front axle ( one where the diff housing runs from left to right with steering joints at the wheels Like the old jeeps / land cruisers /ford mavericks) there are bearings top and bottom to allow the wheels to turn on steering. These bearings fail regularly (king pin wear) and the resultant movement upsets the running position of the drive axle inside . Hence as the stub axle falls about the u-joint on the drive shaft cannot stay in the correct operating plane and locks up. Have a front end specialist check it out for worn points and ball joints.. If you have an independent front suspension then the problem may be in lower or upper ball joints.
SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4
One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.
SOURCE: transfer case noise
your u joints are gone.it is common on gm trucks,as they are a sealed unit and the needle bearings rust .there are replacement u joints available that have grease nipples on them. there should be very little play,less than 1/8 inch.
SOURCE: 93 f250 transfer case lever will not push down to
There is a sequence to it. You have to be stopped and in NEUTRAL before shifting into the big low gear.
You have to reverse the procedure to get it out of low.
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