Hey all, OSS here;
I installed a Demon 650 double pumper on my '84 Trans-AM w/ 700r4 tonight. I'm aware double pumpers are ment for manuals. There wasnt a bracket to install the kickdown cable, so I left her off. Now, I fired her up at the parking lot tonight and it was almost as if the linkages were disconnected in the transmission..I could slide the shifter very easily without resistance up and down the 'gear range'. Car rested in park the whole time... I removed teh console..everything seems connected still...I dont understand what's going on here...Any ideas?

-OSS

 

That's not a kickdown cable. That's a Throttle Valve cable, it's far more complex in its function than any old school kickdown cable was. It controls the hydraulic pressures inside the transmission so you cant just leave it off. If you had actually driven it around like that you'd ruin the transmission very quickly.

And if you dont get the geometry right with the throttle linkages then you'll still burn up your trans. They make adapter brackets to replicate the stock geometry. A certain amount of throttle input has to have a certain amount of pressure inside the transmission so that it knows when and how hard to shift.

Take the time and do this right.

This is a sad picture, but this is how I had mine set up. Since I was able to adjust where the TV cable was fairly easily, I was going to try and do without that adapter bracket I was mentioning, but most people here will tell you that's a bad idea, I had still planned on ordering it. For obvious reasons I never got around to it. By the time I had this motor rebuilt I had a T56, but this is roughly how it needs to be done.

 

Hrm..well thankyou for the response. I'll change my carb back over to the Rochester then. At least that carb has the proper hookups! Thanks!

-OSS

 

Update: Swapped carb back over, hooked up TV cable but still no luck. I jacked up the car to see the transmission linkage was disconnected from the shift cable. I found a spare c-clip for the carb, so I jimmied it on for now till I can get to the shops tomorrow.

 

They make adapter brackets to replicate the stock geometry.

Where can you get this adapter bracket???

 

Summit has it, most of them have it Im sure, this is the part:

http://www.holley.com/20-121.asp

http://www.summitracing.com/parts/HLY-20-121/