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chevy transmission 4 by 4

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New User

Sep 3, 2007, 10:39 PM

Post #1 of 2 (1762 views)
chevy transmission 4 by 4 Sign In

I just got a 1986 a chevy 3/4 ton pu with a 350 and a 700r transmission ,it wont shift out of first gear. the fluid is full and not burnt but not new so i dont think no one worked on it recently.I tried shifting it manualy but that didnt work. any ideas?

Tom Greenleaf
Ultimate Carjunky / Moderator
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Sep 4, 2007, 3:18 AM

Post #2 of 2 (1752 views)
Re: chevy transmission 4 by 4 Sign In

Check for vacuum leaks. The 700R might still use a vacuum diaphragm to sense load on engine and if vacuum is zero it will think it's under full load and stay in the lowest possible gear. Also check for mechanical cable that tells the trans the throttle position. Trans should upshift by overriding centrifical governer at about 40mph depending on rear axle ratio. That's pretty high rpm for an old engine so try that AYOR,


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