Coming Soon: 4L65RR Manumatic System

[Turbo67camaro]

I've decided to go with a 4L80E solution with computer control.

I'll make up some up the weight gain with an aluminum drive shaft.



The first gear won't be optimum for out of the hole performance w/ 3.42 rear, but since my motor is cammed for low end torque and will use a turbo, it won't be a slouch either. With a 6000 rpm redline, 3rd gear should go to 145 mph, so I can finish the 1/4 before needing 4th.

Added bonus: the 2.48 1st might keep my wife from snapping the rear end !

For autocross and road racing, the 2.48 1st gear with 3.42 rear may prove a useful combination. If I went with a 4L60E, the 3.06 1st gear w/ 3.42 rear may be too wide to be useful, especially with a turbo motor that makes power at a lower RPM.

For highway overdrive, the wider .75 OD 4th should pair well with my 3.42 rear. With an EFI motor cammed for low RPM torque, I may sacrifice gas mileage slightly and unnecessarily compared to the .70 or .67 ratio of other trannys, but I'll get a little insurance against lugging. I should be able to plod along well at legal speed even up moderate hills. 65mph should be 1994 rpm in 4th. Maybe I'll get lucky and the RPMs will be in the sweet spot for MPG.

If money were no object, I'd get upgraded gears in the 4L80E (2.75 1st, 1.57 2nd), but I'll probably justify that money elsewhere.

Now, to figure out what torque converter and stall speed, and where to get that 4L80E.

In short, for about the same price as a really well built 700R4 or 2004R, I can get into a electronic solution. However, I get more control, more reliability, more consistency and safety at the drags, and ability to upgrade to a paddle shifter. Small price to pay for a little weight gain.

Picking a transmission has been the most difficult decision on building this car by far.

Steve, PM sent to find out what model that PCS computer is so I can research it.

Thanks for the help,

Mike