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2003 Silverado 1500 HD torque specs Differential housing Transmission

Rocko973

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Rocko973 Enthusiast

Rocko973

Posted
Posted

Hi Everyone!

 

I have a 2003 Silverado 1500 HD with 112K miles, and I hate to say this but I have never changed out the Differential Fluid, Transmission Fluid, Brake Fluid, Power Steering Fluid, and Coolant. Unfortunately I have no good excuses, blame is all on me, however, she has been pretty much been sitting in my garage the last four years. She has Always been garaged though, for whatever that's worth.

 

I am hoping to change out the Diff fluid and Transmission fluid + filter and brake fluid this weekend. Can anyone please tell me, or point me in the right direction, the torque specs for the Rear Differential Housing bolts, Transmission Fluid Pan bolts, and their plugs, and also the lug nuts, for my year and model, 2003 Silverado 1500 HD? I would really appreciate it...

 

Thanks,

George

 

txab Senior Enthusiast

txab

Posted
Posted

4L60E pan bolts 97 inch lbs or 8 lb ft

drain plug 13 lb ft

 

4L80E pan bolts 18 lb ft

drain plug 25 lb ft

 

Rear Diff:

 

Fill Plug (All Except 9.75 Inch Axle) 24 lb ft

Fill Plug (9.75 Inch Axle) 15 lb ft

 

Drain plug:

 

Drain Plug (All Except 9.75 Inch Axle) 24 lb ft

Drain Plug (9.75 Inch Axle) 20 lb ft

 

 

Cover bolts 30 lb ft

 

Wheel nut torque 140 lb ft

Rocko973 Enthusiast

Rocko973

Posted
  • Author
Posted

Thanks for your help, Txab. Just one more question: is the drain plug on the 4L60E the same for the Rear Diff plugs? If not, do you have that?

 

Thank you!

George

txab Senior Enthusiast

txab

Posted
Posted

Most people report not being able to remove the plug without stripping the head. '04 forward don't have drain plugs. I just use a big catch pan

 

13 lb ft for the trans pan plug for a 4L60

 

Here's a write-up for the pan drop. Has lots of good info that will apply somewhat to your setup.

Rocko973 Enthusiast

Rocko973

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Thank you so much!! This forum is awesome! I just love how we enthusiasts can share and talk truck stuff. I am so excited to be doing this work and getting my great truck back in tip top shape. I'll never neglect her again! I only hope I can eventually offer some help and advice some day here on this forum...

 

Thanks!

George

Badass69 Senior Enthusiast

Badass69

Posted
Posted

Your truck has a 4L80E transmission, not a 4L60E. The bolt torque is actually 18 lb ft for the pan to case bolts. Otherwise the rest of the specs above are correct for your truck. Make sure you get parts for a 4L80E, not a 4L60E. Your rear diff is a 9.5" 14 bolt semi floater.

 

Good luck.

Rocko973 Enthusiast

Rocko973

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Hi, thank you for your response. I just want to make sure: Did you actually mean 9.75" and not 9.5", or is my axle really a 9.5" axle as you wrote? The Diff Plate does have 14 bolts though, as you stated.

 

What does the 9.75" (or 9.5") refer to exactly?

 

Thank you!

Badass69 Senior Enthusiast

Badass69

Posted
Posted

Hi, thank you for your response. I just want to make sure: Did you actually mean 9.75" and not 9.5", or is my axle really a 9.5" axle as you wrote? The Diff Plate does have 14 bolts though, as you stated.

 

What does the 9.75" (or 9.5") refer to exactly?

 

Thank you!

 

As stated it's the ring gear size in the trucks rear end. It is 9.5" as I stated. 9.75" is a Dana 60 that was not offered in your truck unless you have a Quadrasteer Denali pickup.......... which you don't because it's a Chev, not a GMC for one.

 

If you want to get a cover gasket for when you change oil in the rear diff you will need to know what differential the truck has. Your diff holds 5.5 pints of oil btw. Just use a good quality synthetic oil and DO NOT use any limited slip friction additive. The Gov Lock doesn't need it and the additive will actually cause them not to work properly oddly enough........ not that I care as I trashed mine for Detroit Lockers, lol.

 

The transmission will vary. Probably 6-8 quarts with a pan drop and filter change. If you are lucky your drain pan will have a plug in it so you don't need to take a bath in atf. If not... well leave one or two bolts in and pry the oppostie side down slowly. My 05 didn't have a plug in the drain pan, so I bought a Dorman replacement that does. My 04 on the other hand has one from the factory........ go figure.

txab Senior Enthusiast

txab

Posted
Posted

A good tip for you..... always remove the fill plug first. There have been occasions where people have had a helluva time breaking it loose. Some have needed to have someone else do it for them. So if you drain first and then cannot fill it, you got a problem

Rocko973 Enthusiast

Rocko973

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Thanks, Notamember, for taking the time clear that up for me. I actually bought some Redline Diff oil, 75W 90, which has limited slip additive already in it. I was told by "someone" that the Additive wouldn't hurt anything, but now I am skeptical after what you just said. Just to be safe, I will use something else without the additive. Thanks so much!

 

George

Rocko973 Enthusiast

Rocko973

Posted
  • Author
Posted

Thanks, Notamember, for taking the time clear that up for me. I actually bought some Redline Diff oil, 75W 90, which has limited slip additive already in it. I was told by "someone" that the Additive wouldn't hurt anything, but now I am skeptical after what you just said. Just to be safe, I will use something else without the additive. Thanks so much!

 

And yes, my transmission luckily has a drain plug.

 

George

Rocko973 Enthusiast

Rocko973

Posted
  • Author
Posted

Hi, I just want to be extra sure that I am not missing anything, but when I do the transmission fluid drain/fill on my 2003 Silverado 1500HD, the fill is through the dip stick hole, right?

 

Thanks in advance!

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