Overdrive Transmission for 630 HP motor
I've been running an Extreme Automatics Stage 2 - 2004R transmission with a 3800rpm stall converter with 3-carbon fiber lock-up clutches in my 408 Magnum powered '68 Barracuda convertible for nearly a decade now. It's the best performing transmission I've ever had the pleasure of owning. It's compact, very strong when built properly and the gear ratios are nearly perfect. I run 3.91 gears with 28" tall 275/65R15's.
I'm essentially doubling the horsepower with my latest upgrade, and am installing a Stage 2 - 4L60E from Performabuilt rated at 900hp. I also had the super-low ratio 1st gear changed to a ratio much closer to the 2004R with a 6 pinion gearset.
The 4L60E fits in the car with only a minor modification to my custom crossmember, as the mount itself is in a slightly different place. I did not have to cut the floor to install the 2004R, but I did modify the torsion bar crossover to fit the transmission in the tunnel with the proper driveline and pinion angles.
The 4L60E is fully programmable, which is a nice feature, but this transmission is as yet untested in my case.
Note the fully spot welded seams, which I did while installing the full US Cartool Chassis Stiffening Kit. I also added my own version of a Monte Carlo Bar to help support the front half of the car.
I was blessed to have found such a rust free example of this A-Body. The chassis was very strong even before adding the US Cartool kit.
I've been running an Extreme Automatics Stage 2 - 2004R transmission with a 3800rpm stall converter with 3-carbon fiber lock-up clutches in my 408 Magnum powered '68 Barracuda convertible for nearly a decade now. It's the best performing transmission I've ever had the pleasure of owning. It's compact, very strong when built properly and the gear ratios are nearly perfect. I run 3.91 gears with 28" tall 275/65R15's.
I'm essentially doubling the horsepower with my latest upgrade, and am installing a Stage 2 - 4L60E from Performabuilt rated at 900hp. I also had the super-low ratio 1st gear changed to a ratio much closer to the 2004R with a 6 pinion gearset.
The 4L60E fits in the car with only a minor modification to my custom crossmember, as the mount itself is in a slightly different place. I did not have to cut the floor to install the 2004R, but I did modify the torsion bar crossover to fit the transmission in the tunnel with the proper driveline and pinion angles.
The 4L60E is fully programmable, which is a nice feature, but this transmission is as yet untested in my case.
Note the fully spot welded seams, which I did while installing the full US Cartool Chassis Stiffening Kit. I also added my own version of a Monte Carlo Bar to help support the front half of the car.
I was blessed to have found such a rust free example of this A-Body. The chassis was very strong even before adding the US Cartool kit.