Question about 1994 GMC Jimmy

1 Answer

My 1994 Jimmy was in a rear end accident and all the transmisson fuel leaked out. I aws able to operate the transmisson after the wreck so I think it is the rear seal. What's the procedure for replacing the rear seal?

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 63 Answers

Replacing the rear transmission seal involves removing the driveshaft for access.

Depending on the ground clearance of the vehicle, you may need to raise the rear of the car and support it on safety stands. Please make sure that the car is completely stable before continuing any work if you do need to raise it.

You will need some tools, mainly the correct sized wrenches or socket set to fit the bolts and nuts that must be removed. A large screwdriver will come in handy, a hammer, a marking tool, tape and if the transmission has fluid in it, you should have a container for catching any fluid that will leak out. You will of course need the correct seal for the back of the transmission and transmission fluid of the correct type to replace any that leaks out during this procedure.

The first step is to mark the location of the driveshaft in relation to the connection on the rear end. Using chalk or some type of marker, make a mark on the driveshaft and also the pinion yoke. This yoke is the part that the driveshaft universal joint is bolted too. Once that is done, you can start unbolting the caps or straps that are holding the universal joint to the rear end. With those connections out of the way, gently use the screwdriver to lever the driveshaft forward far enough for the universal to clear the pinion yoke. Now drop the back of the driveshaft down and using the tape, wrap a few runs around the universal joint and its caps. This will keep them from falling off and getting dirt in the caps which can damage the inner bearings.

Now you are ready to remove the driveshaft. While not very heavy, it can be a bit tough to handle while laying under a vehicle. Take your time and simply pull the driveshaft backwards until the front input shaft slides out of the transmission. With the container in place, any fluid that escapes should be caught. You can now lay the driveshaft to the side, but place a rag underneath the input shaft to minimize any dirt being picked up.

You can now remove the rear seal from the transmission. Normally using the screwdriver and being careful to only pry on the seal, you should be able to lever out the seal. You may need to work your way around the seal, levering it out a little bit at a time, but it will come out. With the seal out, wipe the seal area to remove any dirt, fluid, etc. I prefer to put a touch of sealant around the outside circumference of the seal (painted area), but it is not mandatory, just a little insurance. Using the hammer, carefully tap the seal back into place. Take your time and do not damage or bend the rubber seal area.

Now you can put the driveshaft back in, but here are a couple of tips. First, place the gear selector in neutral, this will help you line up the back of the driveshaft with the marks that you made during removal. Second, wipe the rubber of the seal with just a touch of transmission fluid to lubricate it.

Once you have the driveshaft input shaft back in the transmission, you will need to line up your marks on the driveshaft and rear pinion yoke. You should be able to rotate the driveshaft as needed, then remove the tape and push the driveshaft back in place. Replace the caps or straps, start the bolts, then put the gear selector back in park. Now you can tighten down the bolts or nuts as required.

Safely lower the car back to the ground, top up the transmission fluid as required and you are finished.

Please let me know if you have any additional questions concerning this issue.

Posted on May 07, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 2000 subaru forester does not start

check to see if the fuel shut off has been tripped some times they
do not completely trip in wreck but trip a short time later some times
even bumpy roads cause them to trip without wreck

Jan 01, 2014 | Cars & Trucks

1 Answer

93 gmc jimmy had the egr vavle taking off and cleaned. The guy told me to run some fuel injection cleaner through it to help cause it was covered in carbon. I put in stp complete fuel system cleaner and...

Check for a vacuum leak around the EGR Valve . It is possible the EGR valve stuck open after cleaning it and causing an internal leak now.

Sep 15, 2017 | 1996 GMC Jimmy

2 Answers

Reset fuel pump after a wreck

on some of the escorts, there is a red button, that is in the trunk area, located on the right upper side, this is a fuel pump reset button, it allows the fuel pump to activate, and pump the gas from the tank to your engine, i believe that the sysytem is designed to shut off the fuel in the event of an accident, so that is why it has to be reset. hope this information helps you out.

Feb 13, 2011 | 1994 Ford Escort

1 Answer

1994 Jimmy: trying to find fuel pump on 1994 jimmy...

Unfortunately your fuel pump is in your gas tank. I have to do three of them - tons of fun

May 06, 2010 | 1994 GMC Jimmy

1 Answer

1994 gmc jimmy need wiring diagram for blinker and wipers

its got a 4.3 vortec in it i think got a piece in the intake called a spider that acts like fuel injecors probley not oppening up to let fuel into the motor also has a fuel presure regulator built in it there kinda pricey but that more than likely your problem

Mar 24, 2010 | 1994 GMC Jimmy

1 Answer

Rear end is leaking fluid

If it is leaking out the front then it is the drive train seal. It is a gasket problem if it is leaking from the back unless you do have a rust hole in it. It could have a hole but I would suspect a gasket first.

Jul 06, 2009 | 1997 GMC Jimmy

1 Answer

It turns over but wont start

the fuel pump safety switch is tripped from the accident, reset it.
The switch is located behind the trim panel inside the truck on the left hand side, there is a small access hole u put your finger through to push and reset switch.

May 26, 2009 | 1994 Ford Mustang

1 Answer

Bad rear axle bearing with probable damage to inner bearings

If you have a bad bearing than there is probably metal throughout the whole rear end. I would contact a toyota wrecking yard and price a complete rear end for your vehicle. Search online for a toyota wrecking yard in your area. A complete rear end will be around $600 dollars.

Mar 01, 2009 | 1994 Toyota Previa

1 Answer

1994 GMC Jimmy not switching gears

1994 transmission is all electronic shift so if you have a blown fuse you will likely start in second gear and never change, also when you let off the accelerator pedal the engine will return to idle rather than stay reved up till the vehicle stops. I would check your fuses and any wires in the area you worked while addressing the coolant leak you could have knocked a wire loose. also check the vaccum line going to your map sensor on the passengers side of engine beside the throttle body.

Jan 15, 2009 | 1996 GMC Jimmy

Not finding what you are looking for?
1994 GMC Jimmy Logo

155 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

76848 Answers


Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides