72 th400 Downshifting problems???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72dreamer · 03-18-2003, 02:37 AM

Anyone know what the switch that is located under the dash on the accelerator pedal's bracket is called? I know that on the th350 they have detent cables for the downshifting. Mine is supposed to be vacuum controled, but the modulator is new and I know that the switch has something to do with it. Please help me figure this one out. My truck won't downshift over 40 mph.

Hooter · 03-18-2003, 02:47 AM

that is the kickdown switch, sounds like your modulator might be the one with the wrong setting for your gear ratio.

72dreamer · 03-19-2003, 01:37 AM

Thanks hooter, but how do I fix it. There weren't any options when I bought the modulator...

Low67C10 · 03-19-2003, 02:11 AM

Id definately check the kickdown switch, there should be power getting the the conncetor on the trans when ever the throttle is wide open(or close to it). Also you can usually hear the kickdown solenoid in the trans click when you open the throttle all the way.

Jason71k10 · 03-19-2003, 12:00 PM

ttt

72dreamer · 03-21-2003, 12:54 AM

thanks guys I'll work on it.

03-18-2003, 02:37 AM	#1
72dreamer Registered User Join Date: Sep 2002 Location: St. George, Utah Posts: 18	72 th400 Downshifting problems???? Anyone know what the switch that is located under the dash on the accelerator pedal's bracket is called? I know that on the th350 they have detent cables for the downshifting. Mine is supposed to be vacuum controled, but the modulator is new and I know that the switch has something to do with it. Please help me figure this one out. My truck won't downshift over 40 mph. __________________ 72 c20 custom deluxe Rebuilt and hopped up 402 BBC Just the body to go...

03-18-2003, 02:47 AM	#2
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,078	that is the kickdown switch, sounds like your modulator might be the one with the wrong setting for your gear ratio. __________________ MEMBER DISCS UP FRONT CLUB 69 custom camper/cst 10 70 monte carlo 383 stroker with a 700r4 77 fully loaded silverado (back in the backyard for a little while longer) 1980 BMW 320i (back in the garage finally) 1981 f@*d f150 4x4 (Robert red ford) tried to kill me 1972 Honda ct 90 trailbike Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com AC/DC RULES!!! First generation Monte Carlo club pictures of my life

03-19-2003, 01:37 AM	#3
72dreamer Registered User Join Date: Sep 2002 Location: St. George, Utah Posts: 18	Thanks hooter, but how do I fix it. There weren't any options when I bought the modulator... __________________ 72 c20 custom deluxe Rebuilt and hopped up 402 BBC Just the body to go...

03-19-2003, 12:00 PM	#5
Jason71k10 ready for reassembly Join Date: Jun 2002 Location: Barrie ONT, Canada Posts: 413	ttt __________________ stock 71 4x4 2003 Jeep Liberty, rocky mountain edition I'm obsessed, and wouldn't have it any other way!

03-21-2003, 12:54 AM	#6
72dreamer Registered User Join Date: Sep 2002 Location: St. George, Utah Posts: 18	thanks guys I'll work on it. __________________ 72 c20 custom deluxe Rebuilt and hopped up 402 BBC Just the body to go...

03-19-2003, 02:11 AM	#4
Low67C10 Registered User Join Date: May 2002 Location: Southern California Posts: 66	Id definately check the kickdown switch, there should be power getting the the conncetor on the trans when ever the throttle is wide open(or close to it). Also you can usually hear the kickdown solenoid in the trans click when you open the throttle all the way.



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