Upgrade to G80 Rear End
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Newbie
Joined: Jan 2008
Posts: 16
Upgrade to G80 Rear End
Did a search but could not find much on this. What would be involved in upgrading a standard differential to G80. I know I need the G80 carrier. Can it be installed into the standard differential housing? What about the axles? Bearings?
4th Gear Member
Joined: Mar 2006
Posts: 2,430
From: Florida
RE: Upgrade to G80 Rear End
First G80 is the RPO code for Limited Slip rear. Yes a limited slip can be purchased for any rear axle assembly. But first your info is limited to the present type of rear axle, gear ratio, axle shaft spline countand year. Also this is not going to be a cheap DIY mod.
Thread Starter
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Newbie
Joined: Jan 2008
Posts: 16
RE: Upgrade to G80 Rear End
the year is 1990 RS 305 TBI. The current rear is 2.78:1 standard. Not sure of spline count. I will check. I understand that I may have 26 or 28 spline axles, true?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
4th Gear Member
Joined: Mar 2006
Posts: 2,430
From: Florida
RE: Upgrade to G80 Rear End
ORIGINAL: 77vettejeff
the year is 1990 RS 305 TBI. The current rear is 2.78:1 standard. Not sure of spline count. I will check. I understand that I may have 26 or 28 spline axles, true?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
the year is 1990 RS 305 TBI. The current rear is 2.78:1 standard. Not sure of spline count. I will check. I understand that I may have 26 or 28 spline axles, true?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
August 2009 ROTM
Joined: Sep 2007
Posts: 1,143
From: Lima, OH and Ft. Lauderdale, FL
ROTM Winner's Club
RE: Upgrade to G80 Rear End
ORIGINAL: blackz87
You have a 2-series 2:73 ratio 10-bolt with 28 spline axle shafts. So to change you would need a 3-series limited slip carrier, new gear set (3:42 or 3:73), 7.5/625 dia (both are the same ) and rebuild kit. You will need about $700/800 for parts and labor. Now is this going to worth it with the 170 hp305 TBI?? My opinion is NO.......money better spent elsewhere.
ORIGINAL: 77vettejeff
the year is 1990 RS 305 TBI. The current rear is 2.78:1 standard. Not sure of spline count. I will check. I understand that I may have 26 or 28 spline axles, true?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
the year is 1990 RS 305 TBI. The current rear is 2.78:1 standard. Not sure of spline count. I will check. I understand that I may have 26 or 28 spline axles, true?
So, if I have 28 spline, I should be able to get complete posi carrier assembly from a G80 7.5" or 7.625" (with bearings), get ring and pinion set,and should be able have shop do the install w/shimming?
4th Gear Member
Joined: Mar 2006
Posts: 2,430
From: Florida
RE: Upgrade to G80 Rear End
ORIGINAL: 77vettejeff
Thanks for the comments. I do not know Camaro's well. It is alot of money. This is my son's car. I am really surprised that an RS Camaro did not come with a posi.
Thanks for the comments. I do not know Camaro's well. It is alot of money. This is my son's car. I am really surprised that an RS Camaro did not come with a posi.
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