Looks like FAST makes something that might work, and I saw a couple others that may work as well. The gear ratios in the 6R80 are as follows:
4.17, 2.34, 1.52, 1.14, 0.87, 0.69
Biggest hurdle I see is figuring out what rear end ratio to run with the thing. A 2.73 would be equivalent to having a 4.10 out back of a 4R70W in gears 1-3. Not bad if you cross the traps under 115mph and can rev to at least 6250 rpm.
Guys like David, Chris, or Kevin running 125mph+ trap speeds could get away with a 3.27 at the cost of shifting into 4th, but 1st-3rd gear would blow the tires off with a 13.63:1 final drive ratio. That's like a 4.80 rear gear!!
Oh well... maybe it's not such a good idea after all.
Guys like David, Chris, or Kevin running 125mph+ trap speeds could get away with a 3.27 at the cost of shifting into 4th, but 1st-3rd gear would blow the tires off with a 13.63:1 final drive ratio.
as power levels go up you don't need as many gears. that is why i want/am going to a powerglide (just 2 forward gears)
Gear ratio's are the last worry. Bolting it up to your 3.8L would be by far the biggest challenge.
I have been thinking about going with a C4.............
With the advances they have with the AOD's and how tough those things are becoming (I've read easily over 800rwhp now) I'd get a built up one and at least have the OD when cruising along. Later vehicles with the 4r70w's are also up there when using a more modern one.
I don't think there is anyone in the club running high enough power with the v6 that can out run a properly built up AOD/4r70w.
Fraser
With the advances they have with the AOD's and how tough those things are becoming (I've read easily over 800rwhp now) I'd get a built up one and at least have the OD when cruising along. Later vehicles with the 4r70w's are also up there when using a more modern one.
I don't think there is anyone in the club running high enough power with the v6 that can out run a properly built up AOD/4r70w.
Fraser
I agree, but only if the car is mostly street driven and doesn't exceed a 1000 HP. For an SC of average weight that is mainly driven on the track or is making more than a 1000 HP (at the crank), I'd use a built TH400. From everything I've read, the C4 won't last very long in a high powered car that weighs more than 3000 lbs. Even the high powered mustang guys think their cars are too heavy for a C4, and the majority of guys with more than 650 rwhp use either a TH400 or a Glide.
David
Gear ratio's are the last worry. Bolting it up to your 3.8L would be by far the biggest challenge.
I thought that is what they made arc welders for .
Fraser
Found the gear ratios for the 6r75. And some comparison numbers of other tran's
6R75............................4.17 2.34 1.52 1.14 0.87 0.69 Thats one hellofa 1st gear.
4R70W................................2.84 1.55 1.00 0.70
AOD....................................2.40 1.47 1.00 0.67
C4......................................2.46 1.46 1.00
M5R2............................3.75 2.32 1.43 1.00 0.75
M5R2-C.........................3.42 2.16 1.34 1.00 0.75
And I see Ricardo is building tran's for ford. 6 Speed manual. Looks like a good one too.
Ricardo 6...........2.611 1.708 1.233 0.943 0.767 0.625
Pulled these numbers for this site Ford trans ratios
I just came across this on a 71-3 Mustang site that Performance Automatics company has a kit for mating a 6R80 with a Small block ford, which should mean our 3.8's as well.
thread says summit racing sells a complete kit with trans and controller.
Just looking into this myself as have thought would really like the idea.
Ed - can you bring in a 2.7EC crate motor!!
Pete in Toronto