How to replace front shaft seal - Bunn Margarita Machine Ultra 2 Slush Granita Maker

seal installed wrong way round
groove worn in seal surface on axle /shaft
worn bush /failing bearing for shaft not keeping shaft in the center of the seal

Keith the seals will need replaced, take into a shop and have a tech give estimate for repair. Check the attached links,instruction and guides, Good luck
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This is not easy....You will need air tools ,spray penetrate,seal remover,hammer,and Jack stands..Seal installation tool,.All proper tools..safety glasses.correct seal replacement.,new lock nut...Set park brake,block rear wheels,raise vehicle front and safely place jack stands under each side of lower control arms..Spray lube front drive shaft mounting hardware and lock nut that holds Yoke on front diff..Let it set to penetrate..put vehicle in neutral..Mark shaft to yoke location and direction perfectly because it has to be installed in perfect timing exactly how it was removed..,Remove drive shaft..Remove lock nut and yoke from front diff...You will have to hold yoke while removing lock nut because it will spin..PROTECT HANDS..( These can be VERY DIFFICULT to remove..Sometimes they have to be heated..You will need a yoke removal tool if it doesn't tap off with hammer...Mark exactly the yoke to spline location before removal..You can take close up photos however Mark it also to be sure...If you re-install it wrong it will vibrate terribly..Once yoke is removed You can remove seal.Make sure the new seal is correct...CAREFULLY..DO NOT DAMAGE SPLINES WHILE REMOVING..Sometimes even the perfect seal remover will damage splines..So cover it to protect spline threads..Clean all areas once seal is removed..Make sure nothing is pitted or damaged...Install new seal with installation tool..Lightly,perfectly tap it flush with diff..You can use old seal to install new seal if you don't have installation tool But only a pro should do that...Once in place Line drive shaft yoke with your marks and tap it on ..Use NEW LOCKNUT AND TORQUE IT TO SPEC..Install drive shaft as marked..torque to spec..Lower truck and check fluid..Complete..

Check where the speedo drive goes into the gearbox it could be the filler hole.

You have to drop the Transmission pan and unbolt the valve body and remove to gain access to the shift shaft. Undo the front nut and the nut on the rear of the shaft. Pull bracket off from front ,then you can slide the shift shaft out from the inside. Then replace the seal that is in the case.

Most common and likely situation with this,... mechanical pump shaft seal has failed. This allowed water to enter into the electrical motor and lubrication from the front bearing had been washed away. The purpose of the shaft seal is to keep the water OUT of the motor!
Now as motor spins, bearings with less lubrication gets a lot hotter!
And... When metal gets hot, it gets soft! What was once perfectly round and lubricated, is now getting oblong or square and not lubricated. Square bearings don't spin well and are not as quiet as round bearings! Hence your loud noise. Oil on the shaft will do nothing. You either need to replace both bearings, front and back, and absolutely replace the shaft seal or, replace the motor and the shaft seal.

I recently had this happen to a fairly new pb-4 that ran dry and overheated for about an hour before I noticed it. I disassembled the volute and impeller on the front of the shaft to look at the condition of the impeller and shaft seal. There are several youtube videos that detail the shaft seal replacement. I ended up having to replace the impeller as well as the shaft seal due to the impeller being deformed. Cost me about $35 for both the impeller and seal.

You need to replace the seal. If you are describing the driveshaft coming from the Transfer case, the part would be called a Pinion seal. You can price the repair by using this description and the Repair shop will know what you are talking about.

Sometimes people refer to the smaller shafts between the wheels and the front differential as driveshafts too. They are cv shafts or output shafts.

get a 4x2 tranny, and replace the 4x4 tranny and 4x4 transfer case with it, you will also need to remove your front drive shaft, that operates your front FWD, and replace the drive shaft for the rear axel.....

Find a good Salvage yard and see about trading parts to convert to 4x2

I see that the solution given is for an axle shaft and not the drive shaft that was asked about. I am 99% sure that if you take out the bolts the other end will slide out of the t-case. Then the u-joint can be replaced as normally done.