Parts advice for new seals

TAJ

New member
Oct 8, 2024
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Americas
Greetings, I was hoping to get some advice on some part numbers I need to order.

I've been driving (and abusing) my 2007 Silverado 2500HD Classic (LBZ) 4x4 [VIN - 1GCHK23D57F191607] for the past 16 years from Alaska to Tierra del Fuego, and the truck currently has 207k miles on it. I'm currently in Argentina where it is impossible to get parts, but I have a friend coming down to visit in a few weeks so I would like to order these so they can be brought down to me.

Last year I changed the rear diff pinion seal so that's good, but suddenly it seems like I'm slowly leaking fluids from every other possible place. I'm no mechanic, so I was hoping someone could advise me on what specific seals I need to order, when I look at the parts sites, I'm unclear if I'm looking at the correct part with some of these seals.

I've looked at my usual go-to parts sites, but I'm a bit baffled here as to what I need exactly. In the past, I've always delt with more straightforward parts like the master cylinder, power steering pump, upper/lower suspension control arms, and various hoses.... those are easy parts to figure out. However, I'm a bit perplexed about the seals that I specifically need. I see numerous seals listed on the Automatic Transmission page and the Axle Shafts & Joints page, but they are numerous with vague names and not listed on the diagrams. I am not trying to be lazy here, it's just that this is all well beyond my knowledge and I'm hoping someone who is familiar with these parts can offer some guidance as to what specific parts I need for the various issues shown in the photographs.

Sorry, about the grimy images, I've been driving through a lot of dust and mud this past week and haven't been able to spray it so it's pretty ugly underneath with the leaks and all.

#1 - Rear Differential


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#2 - Above transmission oil pan.
I have an aftermarket PPE transmission oil pan,. I seem to be leaking fluid from this part just above the oil pan, I have no idea what this is
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#3 - Transfer Case, both sides

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#4 - Motor oil pan
It seems like it's leaking oil from the sensor or whatever that is that enters the midway up the pan from the drain plug

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#5 - Front Drive Shaft, driver & passenger side

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This novice appreciates all advice and suggestions.
Thanks
Eric Mohl
Trans-Americas Journey
www.trans-americas.com
 

1FastBrick

Well-known member
Dec 1, 2016
2,509
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Junkyard
#1 The rear differential is either an issue with the pinion seal or the or the flange on the yoke. That's assuming it properly filled and not over filled. Also that the vent is not plugged either.

#2 Manual selector shaft seal
#3 The first picture is the front outpushaft the 2 pictures after are the front differential pinion seal
#4 The oil pan level sensor has an o-ring But it appear your leak is much higher. Possibly the oil cooler to the block seals or the oil cooler it self
#5 is the Front axle shaft seal's

It's hard to give part numbers because your in a remote location and can not return or exchange them if they are wrong. But if you use a place like Merchant Automotive they should have just about all the correct parts you need. I recommend you call to verify before ordering anything.

1. https://www.merchant-automotive.com/11.5-Pinion-Seal
2. https://www.merchant-automotive.com/manual-selector-shaft-seal-allison-2001-2023/
3. https://www.merchant-automotive.com/gm-duramax-263-xhd-transfer-case-seals-kit-10468
https://www.merchant-automotive.com/Pinion-Seal-9.25-IFS-2001-2010
4. I don't see the o-ring separate but maybe call and ask. https://www.merchant-automotive.com/Engine-Oil-Level-Sensor-Kit-2001-2016
They do have an oil cooler rebuild kit if thats what is leaking. https://www.merchant-automotive.com/Oil-Cooler-Seal-and-Gasket-Kit-LB7-LLY-LBZ-LMM-2001-2010
5. https://www.merchant-automotive.com/Front-Drive-Axle-Inner-Shaft-Seal-2001-2010
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
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Texas!!!
If you change the rear pinion seal (sounds like you already changed it once if I understand what you wrote in your post), I would suggest changing the sleeve on the yoke also. I've seen them get gunked up and grooved from old pinion seals that leaked and wore into them from all the grime and grit they were running in. Here's the AAM part number: 26060977

AAM-26060977.jpg
 
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