Rear Axle

**Br&on's Z** · 08-10-2009, 04:03 PM

So I was just wondering if the ZR-2's came with the 7.5 or 8.5 rear end. I'm getting confused with the different stuff I've read on here. I've heard that the 7.5 had the little "ears" on the top of the housing which mine has, It just doesn't make much sense to me that some blazers came with the 8.5 but the heavy duty ZR-2 would come with the smaller and in turn weaker 7.5. If someone could help me better understand this it would be appreciated.

Tyhuck · 08-10-2009, 04:59 PM

The ZR2 code added many heavy duty options including the 8.5" axel. Somebody check me but I think Im right.

raven2510 · 08-10-2009, 08:30 PM

All ZR2's 94-98 should have an 8.5" rear diff.
Mid year 99 GM switched from the 8.5" axle to the 8.625" axle.
All ZR2's 00-05 should have the 8.625" axle.

**Br&on's Z** · 08-10-2009, 10:59 PM

Mine is a 2001. Does the 8.625 still have the little ear looking pieces on the top?

zr2bccan · 08-18-2009, 05:24 AM

I have an '00 zr2. I'll check the diff in the mornin' for ears. I think the diff is made by Eaton. Thier site might have some id info.

Tyhuck · 08-18-2009, 10:23 AM

Quote: Originally Posted by Br&on's Z

Mine is a 2001. Does the 8.625 still have the little ear looking pieces on the top?

Yes because my 01 also has the little ears on it.

08-10-2009, 04:03 PM	#1
Br&on's Z Rollin' 32's! Age: 18 Join Date: Jun 2009 Posts: 1,227 Location: Gate City, VA User is: OffLine	Rear Axle So I was just wondering if the ZR-2's came with the 7.5 or 8.5 rear end. I'm getting confused with the different stuff I've read on here. I've heard that the 7.5 had the little "ears" on the top of the housing which mine has, It just doesn't make much sense to me that some blazers came with the 8.5 but the heavy duty ZR-2 would come with the smaller and in turn weaker 7.5. If someone could help me better understand this it would be appreciated.
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08-10-2009, 04:59 PM	#2
Tyhuck Game Pop. Control Agent Age: 25 Join Date: Feb 2009 Posts: 597 Location: East, TX User is: OffLine	Re: Rear Axle The ZR2 code added many heavy duty options including the 8.5" axel. Somebody check me but I think Im right.
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08-10-2009, 08:30 PM	#3
raven2510 Overhead Console Expert Age: 22 Join Date: Jan 2008 Posts: 1,729 Location: Omaha, Nebraska User is: OffLine	Re: Rear Axle All ZR2's 94-98 should have an 8.5" rear diff. Mid year 99 GM switched from the 8.5" axle to the 8.625" axle. All ZR2's 00-05 should have the 8.625" axle.
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08-10-2009, 10:59 PM	#4
Br&on's Z Rollin' 32's! Age: 18 Join Date: Jun 2009 Posts: 1,227 Location: Gate City, VA User is: OffLine	Re: Rear Axle Mine is a 2001. Does the 8.625 still have the little ear looking pieces on the top?
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08-18-2009, 05:24 AM	#5
zr2bccan Registered User Join Date: Aug 2009 Posts: 31 Location: User is: OffLine	Re: Rear Axle I have an '00 zr2. I'll check the diff in the mornin' for ears. I think the diff is made by Eaton. Thier site might have some id info.
	[Reply w/Quote]

08-18-2009, 10:23 AM	#6
Tyhuck Game Pop. Control Agent Age: 25 Join Date: Feb 2009 Posts: 597 Location: East, TX User is: OffLine	Re: Rear Axle Quote: Originally Posted by Br&on's Z Mine is a 2001. Does the 8.625 still have the little ear looking pieces on the top? Yes because my 01 also has the little ears on it.
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