Hi, I have a 1986 F250 3/4 ton with a 302 engine. I'm wondering how to go about getting access to the seal which I think is the problem. The info for the axle on the inside door is 27 thats all it says for the axle. Theres a small tag on the rear end and the #'s are as follows...3...V1O8B and below that is 3. 731026H28 And I was going to take off the rear end cover but I didn't see any place to put new gear oil in. Anyway, thats what I would like to find out. Thanks in advance, Rick
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Re: Leak in rear axle
You will need to unbolt the axle and slide it out there should be 6 or 8 bolts on the hub that sticks out of the center of wheel. take this out and there is a spanner nut inside you will need to bend back locking tab and unscreww nut and drum and hub will slide off you will see seal inside hub
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If you can see inside the wheel bearings then they require lubrication from the differential. If they are sealed then no. You don't say if the rear axles are 1/2 ton or 3/4 ton. No brand of seal will seal better than any other. Spray engine degreaser in the rear end and flush out with water. You may need to do that more than once.
JACK up the truck and block other rear wheel both back and take hand brake off ,,remove rear wheel/brake drum/handbrake cable from rear brake/remove metal brake hose/remove rearbacking plate with all parts fitted to it ie brakeshous 4or5 bolts holding the rear axle in to housing and when all parts off then put on a IMPACK PULLER and remove complete backing plate with axle assy and take to the engineering shop to get it pressed off and a new bearing and seal assy pressed back on .
Then refit in reverse of removal and bleed the brakes and top up the rear axle of oil (EP90) apply h/brake take out blocks and lower jack and test drive .. BUT MAKE SURE THE BRAKES ARE 100%
Not that difficult, raiseand support the rear of the truck and remove the wheels. Might as well replace both sides so you know you have new seals, remove the differential cover and drain the fluid. Once differential is opened and cleaned , remove the axle "C" clip that hold the axle in place and slide the axle out. Once the axle is out remove the wheel seal and clean around the area. This would be a good time to replace the wheel bearing too since you have access to them and there not that expensive. Install the new bearing and seal, note make sure you oiled the bearing and seal before installing it back and take care when installing the axle back in and "C: clip. Use RTV silicon gasket maker to seal the differential cover and wheels back on and lower. If your lazy like i am, you can drain the differential fluid and replace it with a 50/50 mix with gear oil and Lucas engine oil additives. That may stop the leak and get you a few more miles. You gear oil is 75W-90 and the capacity is 2.6 liters and 3.6 liters if you have the 11.50 Ring gear. Good luck and hope this helps.
Based on your description I am going to assume your leak is @ the rear of the transmission. If so, the leak would most likely be from the transmission output seal. To fix, you will have to remove the drive-shaft by unbolting it from the rear axle and sliding it rearward out of the transmission. Once the shaft is out of the way, you will need to remove the seal by inserting a pry bar or large screwdriver between the transmission output shaft and the seal lip and pop it out. Sometimes you may have to partially collapse the steel shell inward towards the center with a small chisel and hammer to releive the press fit. Drive the new seal into the bore and reinstall the driveshaft. Check fluid, road test and check for leaks after the road test.
There are 4 bolts for each rear axle. They are located behind the rear brake drums. Remove e-brake cable from rear drum and take off brake line.(carefully). I recomend draining and changing your rear differential fluid too, because if the fluid by run out of axle housing. also you should replace the seals for the axles of if you are changing the bearings. When you are done don't forget to bleed your brakes, and hooking up e-brake cable. I hope this answers your question.
if it is the seal, you will have to remove the caliper and rotor, remove the differential cover and remove the bolt and pin inside the diff carrier housing. push in the axle and remove the axle clip and pull out the axle use a seal puller or prybar to remove seal reverse the steps to assemble