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Old 07-02-2010, 09:18 AM
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350 Shifting to soon?

72 Chevy 3/4 ton pickup. I installed a quadrajet and it is working great. I adjusted the transmission cable with the throttle wide open and then connected the cable. I pulled a trailer for the first time today and going up a steep grade at 55 is down shifted up shifted and down shifted several times very quickly. When I got down to 50 it down shifted and stayed there until I got to the top of the hill. It seems to be shifting early without the trailer as well. I have a stock converter and rebuilt trans with a shift kit. Is the cable to tight?

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Old 07-02-2010, 03:11 PM
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I'm going to stick my face into the obvious first

Is the kickdown the only thing you adjusted right before prob, or did you install tranny+adjust cable before prob? In other words,did it ever act right? If yes to that then its your kickdown adjustment. If no to that it could be(oh geez wer do I start the list) kickdown,modulator,vac leak,governor,etc etc etc
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Old 07-02-2010, 09:25 PM
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Originally Posted by Mertz
Is the cable to tight?
Sounds like it's too long if anything (early upshift).With the throttle blades closed, engine off, look at the cable. You will see a "lock" of sorts that when lifted up, will allow the cable to retract very short. This lock can be hard to lift by hand, you might want to use a screwdriver to lever it up.

Then get into the car and floor the accelerator pedal. That will set the cable. If need be, you can fine tune it a bit tighter or looser than this setting.
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Old 07-06-2010, 11:31 AM
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The cable was set too short. I undid the clip and opened the throttle by hand and it moved quite a bit. I locked it down and now it seems to be shifting correctly. I haven't tried with the trailer yet but I will on Thursay when I leave for 2 weeks of fly fishing on the St Joe River in Idaho.
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