sethj78

I just got my 455 (olds) in my 1978 Regal and I built a beefed up 700r4 for it,I am having trouble with shift times. It shifts hard and long time between shift under light throttle and quick and soft under heavy throttle, I probably don't have the shift cable sweep right and wondered if anyone knew where I could find info on it?

Any ideas???
Thanks in advance

jag1886

You didn't tell us what you have for a carb and manifold, that is needed for good advice.

sethj78

I have a holley 3310 (chart says 750cfm) on an edlbrock performer


I found a site PATC that had specs on the cable sweep geometry...it drives so nice now!!! I googled "700r4 cable sweep specs" and got http://transmissioncenter.net/subject.htm that takes me right to it.


Here is the first couple steps and the CENTER LINE is from the cable.


SUBJECT: Proper installation of the throttle valve cable on Factory and after-market carburetors or fuel injections. This information applies to all 700R4, 4L60 and 200-4R transmissions. Throttle valve cable adjustment instructions, numbers 4, 5 and 6.#1. The button that the cable hooks to at the carburetor or throttle body must have approximately 1 and 3/32-inch radius from the center of the throttle shaft to the center of the button the cable hooks to.

#2. Looking at the throttle shaft lever from the left side at idle position, approximately 33% of the throttle lever total travel must be to the rear of the throttle shaft centerline. And at wide-open throttle, approximately 67% to the front of the throttle shaft centerline. This will be about ½-inch to the rear and 1 inch to the front of the throttle shaft centerline.

#3. The throttle valve cable must be hooked up in this manner so the pressure will rise faster off idle and slow down at heavy throttle. If the pressure cable is pulled in a more even manner the pressure will be too low at light throttle. Failure to hook-up the throttle cable in this way will burn the three-four clutch pack up fast.

#4. The throttle valve cable controls transmission pressure. Adjusting this cable is the most important step when installing a 700R4, 4L60 or 200-4R transmission.

#5. The final step is to adjust the throttle valve cable. The cable must be adjusted so it is pulled fully out at wide-open throttle. To make sure disconnect the cable, hold the throttle wide open with your left hand, pull the cable fully out with your right hand and see if the cable end lines up with the button on the throttle lever. The cable should also be pulled out 3/8 to 1/2 of an inch at idle.