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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

89' C6

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Old Sep 4, 2008 | 10:25 AM
  #1  
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89' C6

hi all

I have an 89' F-150 with a C6 auto tranny. I can still drive it but I have to rev the truck to at least 3 grand before it will take off and then after it takes off it slips until it shifts into second. My uncle thinks it some kind of pump. Does this sound right? How hard is it to fix? Will I have to rebiuld the whole tranny? Will I have to pull the tranny out? I have been driving it like this for a while and it's starting to suck. Any help would be much appreciated.

Thanks
 
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Old Sep 4, 2008 | 11:23 AM
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Have you checked the fluid level? How does the fluid look? It should be a light red. If it's dark, change it.
 
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Old Sep 4, 2008 | 11:45 AM
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Fluid level is good and changed about 500 miles ago.
 
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Old Sep 4, 2008 | 11:48 AM
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Don't know if these have a vacuum modulator, maybe check for that. (a bad one)
 
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Old Sep 4, 2008 | 01:31 PM
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I haven't worked with trannies too much. where is the vacum modular?
 
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