A4 vs A6
Thread Starter
Pro
Joined: Feb 2002
Posts: 568
Likes: 4
From: Central OH
I saw on another thread the difference between an 05 and 06 rear diff and I just wonder what in the hell was GM thinking, those cheap bastages. Its like the 82-02 F-body rears, just cheap aholes.
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 111
From: Tucson AZ
Convert it to a Powerglide
If you are serious about bracket racing, just get the newest C6 you can afford. Then convert it to a Powerglide. In race trim the Powerglide has less internal drag, it is stronger than the 4L65E or the 6L80E, has a very fast releasing trans brake, and has much better converter selection than any other trans available. There is just no equal for strength or consistency.
Most faster bracket classes have a cut off around 11.99. You should consider a 2008 with the LS3 as it would be a better foundation when you start adding a cam, headers, forged pistons, and intake manifold.
You will also have to change the rear end gears as CAFE (Corporate Average Fuel Economy) has all new auto trans Corvettes coming with a nosebleed high 2.56 rear gear. The Z51 cars get a slightly lower gear, but it is still not even close to what you need. If you go with the Powerglide, start with at least a 4.10 rear gear. If you end up with e 4L65 or 6L80, then a 3.42 will do as the lower gears in the trans will make up for the taller difference for the 4.10 gears.
Contact the experts at RPM: 1-800-406-1109
Most faster bracket classes have a cut off around 11.99. You should consider a 2008 with the LS3 as it would be a better foundation when you start adding a cam, headers, forged pistons, and intake manifold.
You will also have to change the rear end gears as CAFE (Corporate Average Fuel Economy) has all new auto trans Corvettes coming with a nosebleed high 2.56 rear gear. The Z51 cars get a slightly lower gear, but it is still not even close to what you need. If you go with the Powerglide, start with at least a 4.10 rear gear. If you end up with e 4L65 or 6L80, then a 3.42 will do as the lower gears in the trans will make up for the taller difference for the 4.10 gears.
Contact the experts at RPM: 1-800-406-1109
Last edited by Vito.A; Apr 11, 2010 at 02:32 PM.
Thread Starter
Pro
Joined: Feb 2002
Posts: 568
Likes: 4
From: Central OH
Then maybe I should just buy a C6 Z06 and put an auto in it.
I come from a bracket racing background and to me a powerglide is really just a drag tranny. I still want a car I can drive on the street and enjoy and a powerglide won't get it done. I had a high 10 sec 69 Camaro with a powerglide in it and it was street driven as well and the glide was a bore.
Were only talking 30hp between an LS2 and LS3, and for a coupe the 2008 vs an 05 or 06 or newer will set me back $10-15,000 more, money that could be spent on mods.
I wouldn't even consider a glide unless I was shooting for well into the 9's and a drag car only. I don't want to go faster than 10.00 and I want to keep the car street driven.
I come from a bracket racing background and to me a powerglide is really just a drag tranny. I still want a car I can drive on the street and enjoy and a powerglide won't get it done. I had a high 10 sec 69 Camaro with a powerglide in it and it was street driven as well and the glide was a bore.
Were only talking 30hp between an LS2 and LS3, and for a coupe the 2008 vs an 05 or 06 or newer will set me back $10-15,000 more, money that could be spent on mods.
I wouldn't even consider a glide unless I was shooting for well into the 9's and a drag car only. I don't want to go faster than 10.00 and I want to keep the car street driven.
If you are serious about bracket racing, just get the newest C6 you can afford. Then convert it to a Powerglide. In race trim the Powerglide has less internal drag, it is stronger than the 4L65E or the 6L80E, has a very fast releasing trans brake, and has much better converter selection than any other trans available. There is just no equal for strength or consistency.
Most faster bracket classes have a cut off around 11.99. You should consider a 2008 with the LS3 as it would be a better foundation when you start adding a cam, headers, forged pistons, and intake manifold.
You will also have to change the rear end gears as CAFE (Corporate Average Fuel Economy) has all new auto trans Corvettes coming with a nosebleed high 2.56 rear gear. The Z51 cars get a slightly lower gear, but it is still not even close to what you need. If you go with the Powerglide, start with at least a 4.10 rear gear. If you end up with e 4L65 or 6L80, then a 3.42 will do as the lower gears in the trans will make up for the taller difference for the 4.10 gears.
If you end up racing with a 6L80, start saving up for an aftermarket 4L65E as the six speed will be short lived.
Most faster bracket classes have a cut off around 11.99. You should consider a 2008 with the LS3 as it would be a better foundation when you start adding a cam, headers, forged pistons, and intake manifold.
You will also have to change the rear end gears as CAFE (Corporate Average Fuel Economy) has all new auto trans Corvettes coming with a nosebleed high 2.56 rear gear. The Z51 cars get a slightly lower gear, but it is still not even close to what you need. If you go with the Powerglide, start with at least a 4.10 rear gear. If you end up with e 4L65 or 6L80, then a 3.42 will do as the lower gears in the trans will make up for the taller difference for the 4.10 gears.
If you end up racing with a 6L80, start saving up for an aftermarket 4L65E as the six speed will be short lived.
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 111
From: Tucson AZ
A C6 Z06 certainly is a larger investment, but is also a lot more car. The LS7 would be the best basis for a drag engine.
There are several C6 Z06 cars that have been converted to an auto trans. The first few were 4L80 and these last ones are 6L80's. With a good converter is is faster and more consistent than the manual 6 speed. Again, if you are interested in this route, call RPM.
There are several C6 Z06 cars that have been converted to an auto trans. The first few were 4L80 and these last ones are 6L80's. With a good converter is is faster and more consistent than the manual 6 speed. Again, if you are interested in this route, call RPM.
