Hi Friend: My name is David i'll be Assissting you today.
#1) First get you a Drain Pan put underneath truck where the Tail Shaft is located you'll loose some fluid when you remove the Rear Transmission Seal.
#2) You might need to Jack up thr rear of your Truck to give you more work space.And Secure your Truck with good jack stands and Also Put some Wheel Chucks (Blocks in Front of your front Wheels to prevent it from rolling forward on you.
#3) Next you'll need to remove your Drive Shaft, There are Four (4) Nuts on the Rear of the Drive line where it connects to your Rear End on the Front Side of 3rd Member.
#4) The (4) Nuts are Hold 2-U-Clamps 2- Nuts per Clamp, Take off the 4 nuts Tap the drive line with a Plastic Mallet this will loosen up the U-Bolts Save all your Nuts ,you'll need them to put back on the U-Bolts to get Drive line back in and Tight.
#5) You might have to use a small pry bar to FREE Up the Drive line Universal Joints and push the Drive line Forward just enough to get Drive line away from the Rear End.NOTE: becareful not to let the 4-Universal Caps come off the Universal Joint.Take some Black Tape and Just Wrap it Around ALL 4-Of the Caps to hold in place until your ready to put back in.
#6) Now Pull back on the Whole Drive Line Slowly and it will Come out of the Rear of your transmission.Thats where your Rear Seal is Located.
#7) Get the Proper Tool to Remove the Rear Seal from the Tail housing, (Seal Remover) and remove it from the transmission.
#8) Now Using a Seal In-Staller You'll line your new seal up to the Tail of your Transmission.Evenly And Tap your New Seal in ,it must be Tapped all the way in until its flush with the Tail Housing.
#9) Now you just Reverse the Removal Instructions( take Off the Tape) and put your Drive line back in. Just put your truck in Neutral so you can get the Rear Cups to line back up in the rear end.
#10) Make Sure you are lined up now put your U-Bolts back in.
And the Nuts on and Tighten up good and Tight.
Don't forget to put back the Transmission Fluid Lost.and after Starting Check and Make sure your Transmission Fluid is up to the FULL line.
This will get you back on the Road Sir.Thank You for Using FixYa Please let me know how my solution has helped you by Voting Thanks Again. From: d_hubbs
SOURCE: leaking rear seal on transmission
if you are talking about the seal at the rear of the tranny where the drive shaft goes into than it is fairly easy.
1.put something behind both tires so the vehicle does not try to roll away when you complete step 2.
2.take the drive shaft down.
3. take a flat head screw driver and a hammer.
4.take the screw driver and put it in the crack where the seal and tranny meet.
5.you will need to tap the screw driver into the crack until you can get a good grip on the seal with the screw driver.
6 you will need to pry out on the seal until you see it move.
7.do this all the way around until you can get the seal out.
8.make sure nothing is in the way of you putting in the new seal
9.put a little bit of tranny fluid on the new seal.
10 put the seal in place and lightly tap the seal. into the tranny.
11. put the drive shaft back together.
please do not forget to rate and comment about your experience today.
SOURCE: 360 ci Dodge Rear Main Bearing Seal Replacement
Yes ,regardless of which seal is used as you have to loosen main bearings so the crank can be moved down as the seals are crush type and you wont have the clearance to fit the new one,Split seals (2 piece)are the easiest to fit without moving the crank too much.The one piece seal also means trans removal.As far as removing trans completely you may be able to move it back while its being held up by a trolley jack and only pull it back far enough to give you the clearance needed.Autos are far easier than manuals.If its the rope type seal a special tool is used to fit them and its not a tool that is sold just anywhere as that type of seal kept noahs ark from sinking and havnt been used in engines for many many years.
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