I had the truck in five times with transmission problems without a fix. Every part in the drivetrain is original, except the rear end. I've run Mobil 1 in it since I broke it in, and even 1500 miles after an oil change, the dipstick still comes out with amber colored oil on it. Posted on Jan 04, 2010 the transfer case control module is located behind the left side of dash behind the headlight switch, you will need to remove the speedo trim around speedometer, then pull put the headlight switch. These were limited to the 1500's. I am getting my 03 Sierra quadrasteer ready for the summer beach trip, and I plan on changing the front differential and transfer case fluids. The Np1 is a selectable.
The previous fluid and the new fluid can be mixed or topped off if necessary. I don't remember the capacity but the dealership would have this information. I can't find a reliable source anywhere that says my truck is supposed to take 2 or 3 quarts of front diff fluid. I thought at first it was only recommended for the diesels, but apparently it's not a bad idea for the gassers either. Insisted that he would personally have a allison transmission guru personally review my vehicle.
There is a small skid plate under it, and a large driveshaft leaves the rear end of the case heading to the rear differential axle. General Motors Engineering Standards, Rear Axle Friction Modifier, Specification 9985412, April 1989. Can anyone confirm that my front diff doesn't take 3 quarts? To my knowledge this particular fluid is still a dealer only item. Lower the truck to the ground. The problem continues and has very serious potential. I've taken the vehicle to 3 different dealerships 4 different times and always find something new creating the problem. But the front is open.
Mine came right out with a t handle Allen wrench. While I had the plug out I took pictures of the amount of shavings and sludge on the magnetic drain plug. When I finished the second quart, fluid came pouring back out and I stuck my finger in and down and it felt full. The 4X4 system was completely disable and inoperable. This occurs at any speed.
Wipe any road grime or dirt from around the plugs with a shop rag. Well they changes some sort of part within the drivetrain and the guru never showed up. I think it actually got rid of a bit of the driveline noise. While I want to bring these services up to date, I do so with a touch of trepidation. At least I don't have to deal with road salt, so all of my junk is in pretty decent shape,with zero rust. The transfer case bearings were replaced.
There are 4 different types. Regular transmission service is necessary to keep your car on the road. It says 75w-90 synthetic but i thought the rear needed something special?? I do have the limited slip rear diff. Very dangerous when this happens. All 4 by 4 trucks, should use the auto trac fluid.
If you do, it will have the code G80 in the list. This could be old news too, I am new here. Dealer has put several parts on including reprogrammed module in transfer case, replaced differential case and gear kit, brake pedal would go to the floor, dealer replaced left front shock because of leaking fluid onto rotor, clunking noise from forward to reverse was told this was normal, engine cranks but does not start, towed in, dealer replaced body control module. Ok, being a guy who usually takes really good care of his cars, I have to admit I'm about embarrassed that I've done this, but I wanted to get some input. Before: After: Jeb I'm starting to worry,. This is in case you can't get the fill plug out.
As a result, improper fluid and filter specifications were displayed at least during the week of Oct 29-Nov 2. Since my, um, driving style tends to break parts in 10-bolt axles, I upgraded the rear to a 9. I replaced both with Amsoil Severe Gear 75W90, and no issues yet. If an individual would prefer an used Sierra, independent as well as main dealers … may be able to supply one, and websites such as Car Gurus can be used to find one locally. The '91 S-Jimmy was purchased brand new and paid off 3 years later. The techs at my stealership argued about this one. Apr 19, 2009 The transfer case shows to use Automatic Transmission Fluid.