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C6 difference

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Old Jul 26, 2006 | 04:37 PM
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From: Middle Gawga
C6 difference

I found a C6 in a 91 van with a straight six. Will this transmission work behind my 87 F-250 with a 351?
 
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Old Jul 26, 2006 | 04:56 PM
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Yes it will.
 
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Old Jul 26, 2006 | 06:30 PM
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Great! Thanks AndyM.
 
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Old Jul 26, 2006 | 06:40 PM
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Kind of, it will bolt up, but the shift points and internal controls will be all wrong.
 
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Old Jul 27, 2006 | 10:48 AM
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So there is a differance in the valve body? If so could I just swap ou the valve body?
 
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Old Jul 27, 2006 | 11:03 AM
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The only thing you should need to change would be the vacuum modulator on the rear of the trans. Make a note of the color band on the one behind the 351. It's what controls the shift points. The tranmissions are identicle internally.
 
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Old Jul 27, 2006 | 11:39 AM
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not to hijack the thread but that leaves me with a question, my truck originaly had a 302, i put a 351w in it and converted it over to automatic. its a c6, and was originayl out of a f 250. now i also just put 4.11 gears in my truck, is there anyway to figure out which modulator to use?
 
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