highboy tranny problems
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Joined: Feb 2004
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From: MN
highboy tranny problems
I've got a 400/c-6 in my highboy, the problem I have is the first time you put it in drive for the day it just sits there, then after about 20 seconds (rough guess) it takes ahold and goes. 
It will work fine all day no matter if you shut it off or whatever, but then the next morning same thing. If you put it in reverse right away its fine, but then when you shift to drive same thing. Its been like this since I bought it in 2000. This winter I took the motor out to freshen it up, the front tranny seal looked like crap so I replaced it figuring that was the problem (figured it was suckin air and not priming pump right away), I also installed a B&M shift kit with new filter and fluid, and it still does it. 
Thought it was the vac line, checked that and it looks good. Tranny is good and strong and pulls my 5th wheel with 1700/ gallons of water and chemicals fine. Any ideas would sure be appreciated.
Rob
It will work fine all day no matter if you shut it off or whatever, but then the next morning same thing. If you put it in reverse right away its fine, but then when you shift to drive same thing. Its been like this since I bought it in 2000. This winter I took the motor out to freshen it up, the front tranny seal looked like crap so I replaced it figuring that was the problem (figured it was suckin air and not priming pump right away), I also installed a B&M shift kit with new filter and fluid, and it still does it. Thought it was the vac line, checked that and it looks good. Tranny is good and strong and pulls my 5th wheel with 1700/ gallons of water and chemicals fine. Any ideas would sure be appreciated.Rob
Freshman User
Joined: Mar 2005
Posts: 25
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From: illinois
not sure if this helps...cuz i'm a chevy guy, but when chevys do it most of the time it is the vacuum modulator that the vac line goes too...i don't know if they are on fords since my truck is a manual but its worth a try
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