The spring pulls the cable assembly taut, that is it's main objective , a side effect is it makes the gas pedal a little harder to push down.
Slipping can be caused by a number of things and what you think is slipping may actually be an RPM flare caused my a timing issue . a stock 727 dances a fine line on shift timing by design , add a shift kit , which changes the line pressure , change clutch pack or band clearance and it throws that timing off.
What gears is your SLIP happening between?
It's not all the time. When it's happened first few were light accelleration at the upshift from 1-2. Once it happened at 2-3. yesterday it happened just pulling off the lawn and out of the driveway. It's definitely slipping...I wind up putting it into neutral and then into drive and then it's fine..and it doesn't happen every time...Right now there's no consistency.
