93 Overdrive shifting problems
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Freshman User
Joined: Dec 2005
Posts: 32
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From: North Atlanta
93 Overdrive shifting problems
Hi, I have a 93 XLT Sb 5.0 160k miles, the main problem is going up a grade in overdrive it surges and actually slows down. If I shift out of overdrive either by the lever or gas pedal it revs up fine downshifts and takes off with no surge. Any grades will slow the truck down, but I drive it in normal D it's just fine.
I have had the tranny fuild changed two times, I bought the truck in early 94 and have had it ever since.
I've searched the board but I'm not having any luck finding the same problem.
Thoughts..
Thanks Mike
I have had the tranny fuild changed two times, I bought the truck in early 94 and have had it ever since.
I've searched the board but I'm not having any luck finding the same problem.
Thoughts..
Thanks Mike
Posting Guru
Joined: Apr 2005
Posts: 1,035
Likes: 2
From: duncan oklahoma
my 94 does the same thing.its a 5.0 with a 4r70w and 3.08 gears. have been told that swapping out a set of 3.55 for the 3.08 would help keep the engine in the powerband better and help lessen the 4-3 downshifts on hills.havnt done it yet,got the gears in the garage,just no time to do it.
Posting Guru
Joined: Sep 2002
Posts: 2,420
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From: Langhorne, PA
I would pull the diagnostic codes, could be a number of things, the tranny would be my last guess. Could be a dirty intake manifold, bad TPS, bad IAC, leaking vacuum line, etc. etc.
I would inject some Seafoam into the intake manifold first, and clean up the intake. search for Seafoam, you should get at least a few hits, that'll give you enuf to start working.
I would inject some Seafoam into the intake manifold first, and clean up the intake. search for Seafoam, you should get at least a few hits, that'll give you enuf to start working.
Thread Starter
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Freshman User
Joined: Dec 2005
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From: North Atlanta
Is that the same stuff as..
Like a saw a kid at Jiffy Lube run thru a ladies car that made it smoke white while it was going thru it?
I'll try that first and plugs/wire/cap/rotor/seafoam, if that's not the trick I'll pull the intake and clean it.
When the motor was replaced at 130k after I lost oil pressure at 70mph I'm not sure if they cleaned all tha stuff before they put it back together.
Mike
I'll try that first and plugs/wire/cap/rotor/seafoam, if that's not the trick I'll pull the intake and clean it.
When the motor was replaced at 130k after I lost oil pressure at 70mph I'm not sure if they cleaned all tha stuff before they put it back together.
Mike
