Trans issues
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Posting Guru
Joined: Oct 2007
Posts: 1,130
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From: Bloomfield Hills, MI
Power brakes, fine. alternator - just tested friday and tested good, its fairlynew! (unrelated problem) which belt is the vacuum belt, which is the vacuum pump?
Senior User
Joined: Aug 2008
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From: FL's Ghettos/Trailer Prk
As stated vaccum pump is under your alternater, and is driven off the double pully. If the belts are tight you might want to do a vaccum test of your Vaccum Regulator valvue black plastic thing on driver's side of IP has two vaccuum line running to it. I found the test on this site and did it on my 88. Mine wouldn't shift into 2nd, I adjusted it and it works fine now.
Elder User
Joined: Aug 2007
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first of all does it shift normally from 1st to second
if it does it isnt a vaccum issue
how is reverse , is it normal or does it slip in reverse
several internal issues can cause the loss of third gear
a c-6 in a 1990 is not that uncommon ans is normal on commercial units especially uhaul they specified c-6 to reduce the cost of the truck and they dont worry about your fuel economy when renting
if it does it isnt a vaccum issue
how is reverse , is it normal or does it slip in reverse
several internal issues can cause the loss of third gear
a c-6 in a 1990 is not that uncommon ans is normal on commercial units especially uhaul they specified c-6 to reduce the cost of the truck and they dont worry about your fuel economy when renting
