79 c6 tranny troubles...............
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Joined: Nov 2003
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79 c6 tranny troubles...............
I have a 79 f250 460 with a c6.,I'am only getting 10 psi of vac(cam).Will the c-6 have trouble shifting at this low vac.It's works great when cold but will not auto shift when (ok manuel)warm/hot and slips out of 3rd.This tranny has just been rebuilt and the tranny guy say's it needs at least 15 psi of vac to work right. Any thoughts 
