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It should have been thoroughly checked. Noises like these on four wheel drives could several different things. A bearing, CV axle, or the differential, or bearings in the differential. A wheel bearing will make different sounds when making a turn. A CV axle is a constant sound. Differential bearings can come and go, depending on if it is a bearing for the axle or a pinion bearing. Axle side bearings usually make a constant noise. The differential can also come and go. Depends on acceleration or slowing down. All these sounds are also with a vibration. Slight to harsh.
Based on your description, I'm thinking the problem is in the transmission casing. I was thinking it was a wheel bearing, based on your description, but that is contradicted by the fact that you say it doesn't sound like it's a wheel or hub bearing.
You say that the the rf cv axle is now leaking where it goes into the trans. I'd say that's a good place to start looking.
A damaged cv axle or half shaft might make more clicking noises on a tight turn. The cv axle is greased up and has balls inside some designs.
Have you checked the transmission fluid level to see how much fluid has been lost thorugh the place where the cv axle enters the trans.? If adding fluid makes the sound lessen or go away, then the trans. is at fault, vs. the cv axle.
A pinion seal leaks for one or boyh of these reasons. A worn pinion bearing or a driveshaft vibration, Sounds as though you have both. Do not confuse tire howl with gear howl, be sure.The rear end can run 3 to 500.00 if not more. Ck the gear oil in the rearend for metal content. That will tell you alot. The hard shifting is generally from a sticky spool in the trans valve body. Have the trans serviced w/new oil and filter. The new oil often cleans the moving parts of gum and varnish buildup.in the valve body. One more thing, the rear ends take a special oil and additive if it's a limited slip or posi lock. You will have a popping/binding noise when turning if the wrong lube is install. Have your driveshaft aligned and balanced at at driveshaft shop.or you will end up tearing up the tailshaft on the trans. Good Luck
The desciption you gave is exactly how it feels when you have an axle with a bad inner CV joint. It won't make a "clicking" noise like when you have a bad outer CV joint, but will shake pretty bad on accel. If you crawl under the car while it's on the ground (don't lift it) and grab on to the axle close to the inner CV joint and wiggle it, there shouldn't be very much play in it. If there is play in it, replace that axle.
Jack up the front end and put stands under it and block rear wheels. Look at axle boots and see if they are cracked. Try turning wheel back and forth sharply and see if you can hear any clicking. Problem could be outer axle joints. If the boots are cracked or you hear a clicking noise you will have to replace the axle. The axle and boot come as a complete unit. Please let me know what you find out.
It is likely both your track bar and the lack of a steering gear box stabilizer. The bushings on your stock track bar can be replaced with polyeurethane or metal bushings which will help curb the problem.
The steering stabilizer attaches to your steering gear box and your frame allowing the steering to be more stable. I have put both on my truck and it drives like a caddy now as a result. If I had to choose between the two items, my money would go to the steering stabilizer first. I believe I bought mine here:
Hope this helps