Originally posted by chenz:
Once or twice under VERY VERY hard
acceleration, I got an actual slip between 2nd & 3rd gear.
Before you spend any money changing parts, have the hydraulic pressures tested. You stated you have a slip sometimes between 2 and 3. Any slip at all indicates clutch, valve or accumulator damage. Once you start to slip, it is not reversible and will only get worse.
Sorry for the bad news, but that�s automatics for ya.
Some additional info,
When the range sensor goes bad the tranny usually jumps out of gear and downshifts all by itself.
The TSS (turbine speed sensor) usually gets the blame for hard shifts but it is not the only cause of it. The best way to test it is with an OBDII scanner that can display multiple data streams. While driving, compare engine RPM to TSS RPM, they will change so look for TSS RPM jumps relative to engine RPM.
Engine performance, alternator noise and bad grounds can cause rough and erratic shifting. Check you CEL code.
The VSS can also be checked with a scanner, look for eractic vehicle speed output.
I�m not a believer in cleaning MAFs, The MAF runs at a very high temp and will clean itself. In addition, the PCM converts the MAF output to a digital step for table look up. It is working or it isn�t.
Don�t beat on it and keep our eye on the slip, but let it get too bad or you will do more damage.
jeff
have you fixed your ford lately?
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