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Driveshaft will not turn in neutral?

Tiny
OLIVERERIC423
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 565,000 MILES
Attempting to replace spider gear in my truck listed above 2500hd. Parts are coming on Monday but wanted to get the project going so that after work Monday I can just start replacing the gears. I got the wheels off and took off the brake calipers. I put the truck in neutral and went to turn the driveshaft to get the differential in the position it needs to be in, but the driveshaft will not turn. Am I missing something? What should be my next step? Also, if there's any tips on replacing the spider gears in a 10.5 inch differential, that would help greatly! Thanks!
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Saturday, July 15th, 2023 AT 4:35 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,339 POSTS
Are you sure it is the spider gears that are bad because a bad ring or pinion gear will make it, so the driveshaft doesn't turn. Anyway, remove the driveshaft from the differential and see if you can turn the driveshaft. This will help us see which side the problem is on. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-remove-a-drive-shaft

This video may help you as well. It shows how to get the axles and spider gears out.

https://youtu.be/ytqXLSjHNm0

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Sunday, July 16th, 2023 AT 11:01 AM
Tiny
OLIVERERIC423
  • MEMBER
  • 16 POSTS
I am not sure it is the spider gears. Looking at it today I don't even know where they would be at. I do not have an opening anywhere on the side to find any gears. I guess I should've looked before ordering them, but I can always return them if needed. However, when turning the driveshaft while disconnected from the differential it seems to turn fine. In fact, the differential seemed to turn just fine when disconnected from the driveshaft. I'm thinking it's possible u joint on the rear causing it. Also, when draining the old fluid, it was almost a dark chocolate pudding color. I'm almost positive that's not normal but I am not a mechanic by any means, so I do not know at all.
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Sunday, July 16th, 2023 AT 1:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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No problem, can you turn the driveshaft once it is disconnected?
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Monday, July 17th, 2023 AT 10:23 AM
Tiny
OLIVERERIC423
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  • 16 POSTS
Yes I can.
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Monday, July 17th, 2023 AT 1:19 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,339 POSTS
This means the rear differential is the problem, I would remove the rear cover for inspection. Please go over this video to help:

https://youtu.be/6F26Kir0OCg

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Tuesday, July 18th, 2023 AT 10:22 AM

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