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Old 05-14-2011, 05:35 PM
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Silverado differential cover size

I need a new diff cover for my 2000 Silverado 2500 6.0L 4wd. There's a a couple different options. I need to know what size ring gear I have, 9.5 or 10.5. It's a 14 bolt
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Old 05-14-2011, 06:05 PM
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I believe most 2500 6.0s have the full floating rear axle, which would be the 10.5" ring gear. There were some "light duty" 2500s that still had 8 lug wheels (at least some of those had the 5.3) but the semi-floating 14 bolt, those had the 9.5" ring gear. Take the center cap off one of your rear wheels to see if you have the full floating axle or the semi floating.

I too have a '00.
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Old 05-14-2011, 06:29 PM
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If we could get a picture of the rear cover I would feel more comfortable in saying what it is. Around that time is when the AAM axles started showing up.
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Old 05-14-2011, 06:45 PM
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The AAMs showed up in the 01-up Silverado/Sierra HDs with 11.5" ring gears. The 99-04 "non-HD" 2500s used the 9.5 (semi floating) and 10.5" (full floating) 14 bolts. The 1500 HDs also used the 9.5' 14 bolt.

This may help too:
https://www.4wdfactory.com/store/cat...al-Motor-Axles
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Old 05-14-2011, 06:54 PM
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Randy lists both the 10.5 and the 11.5 for 2000 in the Silverado 2500 (Non-HD).

Very confusing. Wonder if there is a GM Light-Duty expert around here that can chime in? Can't help but wonder what options gets what axle.
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Old 05-14-2011, 07:17 PM
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What's even more confusing is that 8600GVW 2500s in 99 and 00 were also called "HDs". My truck that I posted above is the "HD" with the 10.5" ring and pinion. The 9.5" semi-floating 2500s had a 7200 GVW.

http://dieselpower.automotive.com/10...dup/index.html
http://en.wikipedia.org/wiki/10.5%22...t_Differential

When you mention "Randy", are you talking about Randys Ring and Pinion? I checked it out and I think that's a mistake. My GM service manual (which covers all full size Chevy and GMC pickups and SUVs) lists an 8.5" (for half tons), a 9.5" and 10.5" ring gear. There is no 11.5" listed, those came out with in 2001 along with the 8.1L and Duramax.

Last edited by Blazin72; 05-14-2011 at 07:36 PM.
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Old 05-14-2011, 07:25 PM
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Yea it's kind of confusing.. I have a picture of the rear pumpkin on my phone.. I'll upload it later when I get to my computer.. How would I tell if it's a full floating or semi floating.. I ordered a diff cover from Autozone for a 10.5, it was only $20.. Got a feelining its gonna be the wrong one but dunno.. I can always return this one when it comes in if it's wrong
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Old 05-14-2011, 07:27 PM
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Mine looks like the one in the pic. I have a long bed and I have different stock wheels.
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Old 05-14-2011, 07:32 PM
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Quote:
Originally Posted by cutsupreme
Yea it's kind of confusing.. I have a picture of the rear pumpkin on my phone.. I'll upload it later when I get to my computer.. How would I tell if it's a full floating or semi floating.. I ordered a diff cover from Autozone for a 10.5, it was only $20.. Got a feelining its gonna be the wrong one but dunno.. I can always return this one when it comes in if it's wrong
Pull the center cap off the center of the wheel. The lug nut covers usually just twist off with a 1/2 turn or so. On mine they frequently come loose and I can usually just lock them back in place by hand. After the cover is off, if you see a ring of 8 bolts then you have a full floating axle. If you see nothing then you have the semi floating axle.

Again, the full floater is the 10.5" ring and pinion. The semi floater is the 9.5" ring and pinion.

With a full floating axle you can pull the axle out of the housing with the rear wheels sitting on the ground.

With a semi floating axle you have to jack the truck up, remove the rear wheels, drain the differential and remove the cover, remove the spider gears, pull the c-clips. After all of that, you can pull the axle out of the housing.
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Old 05-14-2011, 07:34 PM
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Quote:
Originally Posted by cutsupreme
Mine looks like the one in the pic. I have a long bed and I have different stock wheels.
If yours is like mine then you most likely have the 10.5. Pull the center cap and take a picture.

Do you have the chrome or painted steel wheels?
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Old 05-14-2011, 07:37 PM
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Mine are the chrome wheels.. I think they're actually chrome covers
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Old 05-14-2011, 07:40 PM
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The 10 1/2 full floater will have a bolt in pinion support. The 9.5 will not.
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Old 05-14-2011, 08:14 PM
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here's some pics
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Old 05-14-2011, 08:23 PM
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Looks like a 9.5
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Old 05-14-2011, 08:26 PM
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Quote:
Originally Posted by Blazin72
Looks like a 9.5
I agree.
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