The transfer case was making l lot of noise. There was no oil in it. I filled it and the noise stopped but it has a slow leak. The oil is not leaking form the gasket or the prop shaft seal. The oil appears on the rear passanger side of the transfer case but I can't tell where it's comming from.
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proper oil in transfer case ? most transfer cases have a separate oil reservoir, heavy duty off roading sometimes makes a hole in oil seals and oil leaks out , I allways wash off all my oil seals surfaces after a visit to the MUD PIT saves me a ton on fixing seals
Sounds like a bearing starting to go somewhere in the driveline; assuming the differential and transfer case are full. As to the oil pressure; If you have the correct weight of oil in the engine and it has been changed on schedule; the higher the better.
If its the front or rear carriar thats not that unusely. These use 80 90 weight oil and it tends to expand a lot usely when the weather is hot this is why they have vents in the cases to prevent the seals from leaking if the pressure were to build up to high. The transfer case is differant thats behind the automatic transmission and that uses ATF fluid that is also vented but normaly dosn't leak fluid. I guess it depends on how much its leaking and if it has been services lately it may have been over filled its better that its leaking at the vent then the seals. If its close to the dipstick its the front carriar witch is the 80 90 oil its cool where i am how hot is it where you are. If its not giveing you a problem or makeing noise just keep an eye on it for now.
If the front differential is covered with oil, chances are that the leak is from the pinion seal on the diff itself or from an engine leak. check all the fluids and find what is low and clean off all the residue there so you can find the source. Since the t case is behind the diff, and the air flow is towards the rear (unless you drive backwards all day long) any leaks would tend to blow towards the back, not towards the front.Once you find the actual leak source, someone here can help advise you on how the repair can be made.
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.
can't help with leak...you didn't say what is leaking...change fluid by removing two one inch flat bolts at back of case, drivers side bottom is drain, upper is fill (remove fill first...if frozen you can't re-fill it.)
Change Oil in transfer case (AWD) make sure refill ith GM trnsfer case oil may have to be done twice to flush out old gfrease trhat the older or original oil builds up slude orbecomes harden over time Alos make sure you chane both frt & rear Differential (not the rear end oil)but you can do that to it won't hurt had similar noise coimg from mine but dealer cost a lot more i had mine down at Jiffy Lube shop and made sure they did transfer case twivce because that was the recogmendation of GM procedure .That what dealer told me but i didn't want to pay around $400.