No, I don't build rears Dave and Chuck do that for me. But, I've built everything else. I've held both diffs and the C5 has gusseting in the rear where the C6 breaks. Its not fool proof but its better. You have a C6 that traps 150? Ok. Road race cars don't count, different forces. You want to send me one of your rears? I'll shatter it like a pumpkin. My car traps 126 or so. No disrespect intended I just disagree and think the C5 rear is slightly stronger. When it warms up I'm going to see how long that one holds.

And, no disrespect to DTE. Those guys make fine C5 and C6 rears. The argument got off topic and back to the C5 vrs C6 rear thing. Sorry for that.

 

No problem Sir...it happens and we're guilty of that sometimes too.

Phil

 

Dave I never said drag racing you did. Second I have installed a C5 housing in a C6, but not for the reason you do. There were no issues with clearance. Second my diffs have seen over 150 and road racing brings a whold ton of new stresses to the diff that a drag cars does not see. On a drag car if it get through the launch then its fine. A road race car has 50 minutes to 24 hours of abuse on it. When you build a diff that goes throught the daytona 24 hour or a season of WC races then you call BS pal. Now that I realize who you are, why have you not used us in your diffs. I know Tony Fegly told you about us as we helped him out plenty. I know you know your engines, you guys did a wonderful job on Tony's C5, but as many of those as you have done that how many diffs I go through. I have built diffs that some claim to have invented before they even thought about it. So maybe when you see a supporting vendor or tuner you might want to think about who it is you are claiming BS too.

 

I know you are a vender before I posted. While I can respect that, I will voice my opinion if I don’t agree and feel it is miss leading. Read what I posted.

“I call BS on your 150+ MPH and not breaking if we are talking drag racing.”

Like I said “IF we are talking drag racing”

We have assembled quite a few C5 and C6 rears for road racing. The only upgrades that are typicaly needed is for cooling. Drag racing rears see’s a lot higher load from launching on slicks and power shifts, not to mention wheel hop. Road race drivers typicaly finesse the launch and shifts.

As far as using you in our diffs, I am confused, what would I need? No disrespect, but what custom parts do you make at ZIP for the rear. We can make claim to be first in a lot of things but what does that have to do with this thread?


I think you need to reread my post’s and realize that I disagree with some of your statements but I haven’t attacked you. Like I said, I don’t want any one to be miss lead. I am stating facts from plenty of experience. It is never good for business to tell a customer his factory rear is weak, and has a high failyer rate when drag raced, but feel it is our responsibility. We posted as well as others, in October of 04 when our rear broke while base lining our rear. We made pictures available, and expressed our opinions on what failed and why. We do not feel our C5 conversion is necessary for every one, but has proven it’s worth in high HP cars on the street and strip.

 

Dave,
I'm sorry, but it sounded as if you were coming after me, at least I took it like that. We have built diffs for both road and drag racing also, we have also blown our fair share up on the drag strip. In my opinion the road car are harder on the diff at least in WC where they do have a standing start, you are also dealing with cars that have clutchs that are on or off with no slip. We have found that on the drag cars the main weakness is in the side cover, and it holds the same on the road cars. I was not referring to you about making claims. We don't have anything special for the drag cars, just a well built diff, the road cars are different though. We offer several diffs from a custom built 8 pack clutch setup to a Quaife. Most of data comes from road racing though, but no matter which it is the rears have the same weakness. I understand what you are saying about the C5 housing, I did not realize you were bolting it in, I thought the customer was stating to just use the housing. Anyways I also did not realize you were building your on diffs, so I can't offer you anything as far as service and my custom clutch setups are not for sale seperatly. If you are interested in a Quaife then I can help, but I am also working on an electronic limited slip setup that can be tuned with a computer. That is a later date though.
Again I am sorry if I took it the wrong way

 

While I cannot comment about what these guys are speaking, I got the stage 2 package from DTE with 4.10 gears. This is, hands down, the best mod done to my car. The difference in the car as far as sotp is concerned is night and day. I don't drag race my car either so the stage 2 is perfect for me and you cannot go wrong with Phil. DTE knows their stuff. Good luck with your modding.


Robin

 

Just for grins.... my '05 rear

 

As far as which rear to have in your car if there isnt any strength gains, I'd rather have a C5 diff with its 700 dollar core charge to pay than the insane 2006 core charge of 2200 for any carnage that occurs. So you use a C6 unit and I'll keep my C5 unit.

 

Oh yeah, the 4.10s are an awesome gear for the manual trans cars.
But it's really not until one launches a manual car on a sticky tire at a sticky track that one can know for sure whether or not one's rear is strong/well built.

 

Spin that is the one area I will absolutly agree with, the price of the new diff from GM is unbelievable. I am lucky to a very good source for them, but without I guess I would have figured out how to use a C5. I have used C5 housing on race diffs, but not for strength issues, we actually used the two series C5 because we were not using the VSS sensor so the housing did not matter. Plus I have paid as little as $20 for a 2.73.