How can I protect my 05 rear diff.
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
Don't run drag radials or slick tires.
Don't drag race the car or attempt to launch it very hard.
Avoid Wheelhop at all costs (this goes for any car with any kind of differential though).
If you plan on breaking rules 1 and 2, or have aspirations of making big power be prepared to replace your weak '05 rear diff with an 06+ or a C5 Z06 rear diff when it breaks. On street cars many have found the 2005 rear differential to be perfectly suited for most types of driving.
I bet someone will suggest a differential brace, but if you search around you will find plenty of people who have broken their diffs with the brace. Others argue that the brace's job is to prevent a broken diff. from breaking the transmission. I'd rather just not break anthing in the first place.
Don't drag race the car or attempt to launch it very hard.
Avoid Wheelhop at all costs (this goes for any car with any kind of differential though).
If you plan on breaking rules 1 and 2, or have aspirations of making big power be prepared to replace your weak '05 rear diff with an 06+ or a C5 Z06 rear diff when it breaks. On street cars many have found the 2005 rear differential to be perfectly suited for most types of driving.
I bet someone will suggest a differential brace, but if you search around you will find plenty of people who have broken their diffs with the brace. Others argue that the brace's job is to prevent a broken diff. from breaking the transmission. I'd rather just not break anthing in the first place.
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
The weakness of the 2005 rear differentials is in the case design; there is not a whole lot you can do to strengthen it so if you plan on racing that just be mindful of how hard you launch and never let it wheelhop.
Drifting
Joined: Mar 2004
Posts: 1,291
Likes: 0
From: Shavertown PA
The 05 diff case was redesigned on 06+ because it was weak and prone to failure.
I can only recommend that if you want to beef it up you'll need hardened left and right output shafts. If you're doing that already go for a gear swap and the newer 06+ diff.
Finally, get the DTE Differently brace that ties the diff to the trans. Worth every cent!!!
New case will give you a better start and minimize the risk of failure in the case. L+R output shafts will protect the weakest internal links. DTE brace will minimize the risk of the shearing force thats inherent under load of the diff wanting to "snap off" the back of the tranny.
If you do these you will have probably the best protection for the rear end you can get.
If you are going to drag at all jus knuckle up and do these steps. You don't have to but then its a just a matter of time.
I can only recommend that if you want to beef it up you'll need hardened left and right output shafts. If you're doing that already go for a gear swap and the newer 06+ diff.
Finally, get the DTE Differently brace that ties the diff to the trans. Worth every cent!!!
New case will give you a better start and minimize the risk of failure in the case. L+R output shafts will protect the weakest internal links. DTE brace will minimize the risk of the shearing force thats inherent under load of the diff wanting to "snap off" the back of the tranny.
If you do these you will have probably the best protection for the rear end you can get.
If you are going to drag at all jus knuckle up and do these steps. You don't have to but then its a just a matter of time.
Drifting
Joined: Jul 2005
Posts: 1,635
Likes: 190
From: Austin TX
replace it now if you have the $$$ and the need to do it. if you wait till it breaks, you could run the risk of screwing something else up. say if youre on a strip and you light up the tires and you break the diff, you run the risk of taking a sharp (90 degree turn) into a wall. try explaining that one to your insurance agent
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Drifting
Joined: Mar 2004
Posts: 1,291
Likes: 0
From: Shavertown PA
I would recommend replacing now. If you grenade a rear end you're looking at the potential for incredible collateral damage for axles, trans, trans output shaft, inner fender wells, etc.
You can get a decent price for the rear end for those that just want to upgrade their gears and offset the cost for the new one with those funds.
Best of luck...I wish a rear end catastrophe on no one!!!
You can get a decent price for the rear end for those that just want to upgrade their gears and offset the cost for the new one with those funds.
Best of luck...I wish a rear end catastrophe on no one!!!
Le Mans Master
Joined: Oct 2007
Posts: 6,149
Likes: 11
From: Greater Detroit Metro MI, when I'm not travelling.
I would recommend replacing now. If you grenade a rear end you're looking at the potential for incredible collateral damage for axles, trans, trans output shaft, inner fender wells, etc.
You can get a decent price for the rear end for those that just want to upgrade their gears and offset the cost for the new one with those funds.
Best of luck...I wish a rear end catastrophe on no one!!!
You can get a decent price for the rear end for those that just want to upgrade their gears and offset the cost for the new one with those funds.
Best of luck...I wish a rear end catastrophe on no one!!!
Your differential is worth a LOT more when it is not in pieces
Not to mention that it is not uncommon for rear differential failures to cause transmission breakage as well...
Le Mans Master
Joined: May 2006
Posts: 8,824
Likes: 3
From: The left Coast
St. Jude Donor '08
Which is exactly why I have the DTE brace on mine. If I break the diff I'm hoping the trannie doesn't go with it.
Safety Car
Joined: Jun 2005
Posts: 3,989
Likes: 5
From: DFW This user does not support or recommend the product or service displayed in the ad to the right
People make a huge issue out of the 2005 diff, mine seems to be holding 446 RWHP on Kumho V710 and toyo RA1 just fine. 
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Buy the RPM new unit is the forum c-6 ads from Drumhawk he had it built special and never put it in. Still on the pallet he'll cut you a deal. then you will be close to bullet proof! Just an idea!
Safety Car
Joined: Jun 2005
Posts: 3,989
Likes: 5
From: DFW This user does not support or recommend the product or service displayed in the ad to the right
No wheelhop is the key, that will tear up any year corvette case. Plenty of guys here have destroyed 2006+ diffs as well.
Safety Car
Joined: Dec 2004
Posts: 4,477
Likes: 2
From: Boca Raton, FL
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Don't run drag radials or slick tires.
Don't drag race the car or attempt to launch it very hard.
Avoid Wheelhop at all costs (this goes for any car with any kind of differential though).
If you plan on breaking rules 1 and 2, or have aspirations of making big power be prepared to replace your weak '05 rear diff with an 06+ or a C5 Z06 rear diff when it breaks. On street cars many have found the 2005 rear differential to be perfectly suited for most types of driving.
I bet someone will suggest a differential brace, but if you search around you will find plenty of people who have broken their diffs with the brace. Others argue that the brace's job is to prevent a broken diff. from breaking the transmission. I'd rather just not break anthing in the first place.
Don't drag race the car or attempt to launch it very hard.
Avoid Wheelhop at all costs (this goes for any car with any kind of differential though).
If you plan on breaking rules 1 and 2, or have aspirations of making big power be prepared to replace your weak '05 rear diff with an 06+ or a C5 Z06 rear diff when it breaks. On street cars many have found the 2005 rear differential to be perfectly suited for most types of driving.
I bet someone will suggest a differential brace, but if you search around you will find plenty of people who have broken their diffs with the brace. Others argue that the brace's job is to prevent a broken diff. from breaking the transmission. I'd rather just not break anthing in the first place.
I'm putting out big rw hp/tq numbers and have launched at 5k with DRs. I have, however, added hardened output shafts and the DTE brace.
Maybe I've just been lucky
Pro
Joined: Dec 2008
Posts: 588
Likes: 21
If one just wanted to be safe with 500 rwhp, no track use but some street play, what would you suggest? A new rear with better parts or a Z06 stock rear? I've seen Z06 stock rears for $900, what's a new built unit usually run? I had no idea the 05 rear was weak. What's most cost effective?
