The pinion seal is shot. A mechanic can replace the seal and check for problems.
23nm/17 ft-lbs
The transmission could have a bad seal or have too much internal pressure causing the fluid to come from the 93 Suburban vent hole. The Fluid is probably leaking slowly, and that is why the level still shows normal.
The only seals on the driveshaft itself would be on the slip yoke. You're probably thinking of the pinion seal, which is at the front of the differential, behind the input yoke to the differential.
The Welsh plug in the yoke is no longer sealed. The yoke will need replaced.The Welsh plug in the yoke is no longer sealed. The yoke will need replaced.
Mark driveshaft, splinced shaft at front of shaft, and rear yoke to ensure that it is replaced at the same position to maintain factory balance Remove and discard small "u" bolts at the differential yoke Pry driveshaft out of yoke and up onto to splines at rear of transmission Drop driveshaft Pull driveshaft off of splined end of transmission Use new "u" bolts on installation
Mark driveshaft, transmission splines, and differential yoke. So that installation will maintain factory balance remove and discard small "u" bolts from differential yoke pry driveshaft out of differential yoke pull drivshaft out of transmission spline shaft bring driveshaft to machine shop to have old universal joints pressed out of shaft and new ones installed or use vise and sockets to drive "U" joints out of driveshaft re-install driveshaft in same position as removed using new "U" bolts
The slip yoke on the Ford Bronco is located on the rear axle rather than on the transfer case. This is the portion of the axle that allows it to flex.
75 ft/lbs
Use a crayon or piece of chalk and draw a line on the rear yoke in the differential and on the driveshaft. Do this on the front end of the driveshaft/trany/transfercase also. This is so the driveshaft goes back into the same position you took it from (otherwise you may get a vibration). Undo the 4 bolts on the rear axel yoke. Pry out universal from the yoke. Pull the driveshaft out of the back of the trany/transfer case. You may loose fluid from the trany/transfer case rear seal so check it when you reinstall it
The yoke on the driveshaft of a gm turbo 350 trans has a small vent hole in it. If the trans is over filled to the point fluid comes out of it you will do serious damage to the trans if you try to drive the vehicle.
Worn yoke/tailshaft bushing
yoke on the driveshaft[s}