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#831377 - Thu Mar 01 2012 05:40 PM trans wont gear down
wodniw5 Offline
Shop Shark
Registered: Tue Oct 04 2005 12:00 PM
Posts: 820
Loc: north carolina
1977 chevy stepside. I swapped out the 305 and original 400th trans and put in a 350 350th trans. ( BE CLEAR I HAVE NEVER DONE THIS MUCH BY MYSELF BEFORE) engine runs great trans shifts smooth but wont gear down. I put on an edlebrock performer intake and a holley 900 4 bbl carb. I had to add a bracket for the throttle cable and trans cable that came with the carb kit. do i need to adjust the trans cable or am i missing something?? any and all suggestuons welcome. Paul
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#831395 - Thu Mar 01 2012 06:50 PM Re: trans wont gear down [Re: wodniw5]
48bigtrucks Offline
Registered: Thu Mar 04 2004 12:00 PM
Posts: 4487
Loc: Center Point, Iowa
The cable should be pulled all the way out when the throttle is wide open. That's the adjustment for the kick down cable. Also be sure you have a vacuum source for the modulator,
Scott
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Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!
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#831488 - Thu Mar 01 2012 11:36 PM Re: trans wont gear down [Re: wodniw5]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 12882
Loc: Dellrose, TN
The only function of the cable on a 350 is for kickdown. Just as the throttle reaches wide open, the cable should reach its full travel. Shift points on a 350 are controlled by the modulator and the governor pressure, which is generated by the speed of the driveshaft. Adjust the kickdown cable to be full forward at wide open throttle and it should function. If it doesn't, there is an internal problem with the kickdown band and/or the servo that applies it. That's overhaul territory!
Jerry
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Matthew 7:6

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