Th350 shifting problem..

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Klinthill544

Junior Member
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Mar 5, 2013
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Location
Tennessee
First Name
Klint
Truck Year
1978
Truck Model
K1500
Engine Size
402 BB
so, when I take off from a stop under normal driving conditions say 25% or less throttle my trans won't shift out of first.. In drive or manually. But, if I take off under heavy throttle, 50% or higher, it's shifts through the gears fine 1-3rd.. Any help would be greatly appreciated, thanks!
 

CSFJ

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Is the vacuum line to the modulator in good shape?
 

Klinthill544

Junior Member
Joined
Mar 5, 2013
Posts
15
Reaction score
12
Location
Tennessee
First Name
Klint
Truck Year
1978
Truck Model
K1500
Engine Size
402 BB
Honesty, I don't know.. Didn't think to check that! I will today and let you know
 

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