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Old 11-27-2007, 10:09 PM   #1 (permalink)
Jasondt2001
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How to change your fluids (Front and Rear Diff + Transfer Case thru Speed Sensor)pics

OK, we're going to start with the materials I've used...



-----------------------------------------------------------------------

For the front end Differential I needed 4 things.

15MM Wrench
13MM Wrench
Oil Catch Can/Pan
Oil & Oil Pump (3 quarts but it won't use all 3) (I used Amsoil Severe Gear 100% Synthetic 75W90 I got from Heath here on the board)

Ok, the GREATEST thing about having a truck I think is even for a big guy like me, i could get under it w/out a creeper and NO JACKS/STANDS!


First thing I did was take and clean the garage and then take the trash to the dump, I wanted to get the fluids nice and warm.

I then parked it in my level garage. Slid my catch pan underneath and went and got my wrenches.
Then i crawled under the truck and here's the pics:

















yes, those little 'hairs' are metal particles on the end of the drain plug.








By 2 pumps, I mean i primed the hose w/ oil up to the end, then I pushed the pump handle down 2 times.


Like I said, I dont know if made a difference but I felt better after flushing that stuff out. It smelled burnt and ran VERY Slowly, and was almost sticky, not what you would think of lubrication wise.

To finish up the front, put the drain plug back in, tighten snug (don't kill it, there's no need) Make sure you kept the little plastic washer off of the two plugs.

Now fill with oil until oil starts to slowly drip/run out of the top, as soon as that happens pull the fill tube out and put the fill plug back in.
Tighten snugly and move on to something else.



-----------------------------------------------------------------------

On to the differential...

I didnt have the right size for the speed sensor, or the drain plug (There's NO need to take out the fill plug if you're going the 5W30 3 quart through the speed sensor hole route).

Materials:
Adjustable wrench
5W30 Synthetic Oil (I used Amsoil 3000 5W30 100% Synthetic Heavy Duty Diesel Motor Oil I got from Heath here on the board.)

First thing I did was unhook the speed sensor wire from the top of the sensor. I then took my adjustable wrench and unscrewed it from the tcase. Once you get it loose it'll unscrew by hand... BECAREFUL with the sensor, as it and it's threads are plastic. So it's also VERY important to NOT overtighten this sensor.

Here are the pics:
























-----------------------------------------------------------------------

Now last but not least... The Rear Differential.

Materials:

15MM wrench
3/8" Ratchet
4 Quarts of Oil and Pump (I used Amsoil 100% Synthetic Severe Gear 75w110 I got from Heath here on the board)

I wasnt able to get many good pictures, I'm sorry, this whole time it was just me doing this and I didnt want to ruin my camera

Here's some pics:
















Ok, after you have finished letting it drain and wiped off the end of the drain plug from all the crud. Put the drain plug back in and start pumping oil into the rear differential fill hole (on the pan itself).
Put 4 quarts in there and if it's not leaking out (Mine wasn't) put your finger in there, you should feel it almost at the top. So i stopped with 4 quarts and was good.
I put the fill plug back on the pan w/ the plastic gasket (and no, the rear diff plug didnt have a plastic gasket, it had a rubber 'hood' around it - so no worries you didn't lose anything).






OK guys, thanks for reading this. Please as always correct me if I'm wrong about something!
I wanted to apologize for the lack of pics near the end, I had greasy oily hands and a $250 dollar camera, I was scared to death doing this. The camera is fine (I love Canon's!). I was all alone or i would have had my wife help and it might have been easier to follow.
Before everyone starts asking why oil in the tcase, Mike L. was made aware of of a problem they were having w/ the dexron they added in at factory fill. They recommended 5W30 motor oil, 3 quarts total added from the speed sensor hole in the case itself.


The truck in the thread is mine....
2007 GMC Sierra Dually, Crew Cab, Duramax & Allison Tranny.
This truck is worked, it's my 'tuner toy' (via EFILive) and also a horse trailer hauler and daily driver. I take care of my vehicles but I do tend to drive somewhat aggressive.

The vehicle has 29,000 miles on it, I would have done it at a even 30,000 but I knew right now I had the time

I hope this helps someone, and feel free to leave me a comment or correct me if I've stated something wrong!

- JasonDT2001


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Old 11-27-2007, 10:20 PM   #2 (permalink)
Heath
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Wow!! It's like watching a movie with subtitles. Very nice and helpful.

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Old 11-27-2007, 10:21 PM   #3 (permalink)
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Fantastic post! I started to get involuntary twitches in my back from having gone through the same maintenance work on my truck a few months ago. My back still hurts from all of the crawling around under the truck.
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Old 11-27-2007, 10:24 PM   #4 (permalink)
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good job!! except to fill you don't have to remove that sensor as you it has an actual fill plug, but nonetheless excellent write up!!
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Old 11-27-2007, 10:39 PM   #5 (permalink)
Jasondt2001
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Thanks you guys!!

Quote:
Originally Posted by Heath View Post
Wow!! It's like watching a movie with subtitles. Very nice and helpful.
Hey man, I couldnt have done it without your product. You made it real easy ordering and it came the day you promised... 2 working days, not bad!!
It's important to buy from our supporting vendors, that's why I kept making the mention I got it from Heath. He couldnt have made it any easier to order and it came in 2 working days, I'm thrilled with our vendor's services!!!
Thanks again Heath!!

Quote:
Originally Posted by Vin63 View Post
Fantastic post! I started to get involuntary twitches in my back from having gone through the same maintenance work on my truck a few months ago. My back still hurts from all of the crawling around under the truck.
Man I know what you mean, I'm sitting here on the couch wondering why I can't get comfortable... Then I'm like "ohhhh yeah, I'll feel THIS tomorow...LOL"

Quote:
Originally Posted by stroke250 View Post
good job!! except to fill you don't have to remove that sensor as you it has an actual fill plug, but nonetheless excellent write up!!
Thanks for the kind words, this is the reason I did it this way... https://www.dieselplace.com/forum/sho...ight=motor+oil
There was a mention of doing it this way by Mike L.
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Old 11-27-2007, 10:42 PM   #6 (permalink)
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Quote:
Originally Posted by stroke250 View Post
good job!! except to fill you don't have to remove that sensor as you it has an actual fill plug, but nonetheless excellent write up!!

Filling from the speed sensor, you can get a little more than an extra quart into the case.

JasonDT2001, how many of the 29K miles were towing? Just curious. I had about the same mileage and my front and rear diff. fluids looked similar to yours coming out. I had about 14K miles of towing, about 50% of the time.
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Last edited by Vin63; 11-27-2007 at 10:53 PM.
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Old 11-27-2007, 10:52 PM   #7 (permalink)
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Quote:
Originally Posted by Vin63 View Post
Filling from the speed sensor, you can get a little more than an extra quart into the case.

JasonDT2001, how many of the 29K miles were towing? Just curious. I had about the same mileage and my front and rear diff. fluids look similar to yours coming out. I had about 14K miles of towing, about 50% of the time.
I'd say a bit over 12K total towing miles, my wife shows her horses every weekend in the summer, it's about an hours drive but it's over a 10% WINDY (WINE-DEE) grade, to there and back.
Im usually at about 12k w/ my trailer and the horses I believe.
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Usually Towing a Exiss 310 Event Series Living Quarters Horse Trailer.

BAD AMERICAN #1
MEMBER #421 OF THE DUALLY CLUB!

Traded but not forgotten:
2005 GMC Sierra Crew Cab S/B 1500 Non HD Z-71 With the 5.3 V8 Non Aluminum Stock (Darn good truck)
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Old 11-27-2007, 10:55 PM   #8 (permalink)
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Nice info.

A suggestion, if your fluid comes out really crappy looking and you want to do a flush and save a little money, you could drain and refill with cheaper dyno axle or T-Case lube, drive around for 20-30 miles to heat up fluid, then drain this fluid, and refill with synthetic fluid.
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Old 11-27-2007, 10:56 PM   #9 (permalink)
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Quote:
Originally Posted by modified View Post
Nice info.

A suggestion, if your fluid comes out really crappy looking and you want to do a flush and save a little money, you could drain and refill with cheaper dyno axle or T-Case lube, drive around for 20-30 miles to heat up fluid, then drain this fluid, and refill with synthetic fluid.
Not a bad idea at all. I didn't think of that.
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Traded but not forgotten:
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Old 11-27-2007, 11:37 PM   #10 (permalink)
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Excellent write up. Thank you!

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