For some reason my truck is slipping gears when I start driving

1969 FORD BRONCO
35,261 MILES
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GEARHEAD21
  • MEMBER
  • 1 POST
(after I have let it warm up for ten minutes.) This also happens when I put it in 4x4 For some reason my truck will go up in rpms but it won't be able to shift (this is without the 4x4 on) I have replaced filters done all my fluids even put in some additives that were recommended to me by my local auto parts store.

Furthermore, when I try to put it in 4x4 my truck won't shift at all and I have to stick it back in neutral and switch between 4x4 and low to get the vacuum's to seal up right so that I can drive a little further.
Jan 26, 2012 at 4:13 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
is this a stick or automatic? if it's s stick have the clutch checked, if it's an auto matic have a trans guy look at it.
Jan 26, 2012 at 8:24 PM
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