95 auto PS tranny ??? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 12-29-2012, 11:19 AM Thread Starter
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95 auto PS tranny ???

My truck seems to shift fine if I have the OD off, but if I have OD on it locks and unlocks the convertor it feels like alot when the truck is just coasting. and sometimes it holds a gear and doesnt want to shift. my speedo does bounce, I changed VSS and it got way worse bounce and sometimes speedo didnt work so I put in old VSS.
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post #2 of 7 Old 12-29-2012, 10:03 PM
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The transmission relies on the speed signal from the VSS so you need to fix the bouncing speedometer first. The signal form the VSS goes to the cab where it splits to the PSOM and RABS module, the PSOM converts the signal and sends it to the PCM which controlls the transmission. You could have a bad wire, bad PSOM, a issue with the RABS module or a bad tone ring. If you have a scope you can jack the truck up and watch the signal while the wheels spin. Otherwise you will have to pick which one you want to try and replace first. The PSOM is fairly common, you can get one out of any similar year 150-350 or Bronco.

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post #3 of 7 Old 01-01-2013, 04:40 PM Thread Starter
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The truck is shifts fine with OD off for awhile but after 20 miles atleast it starts acting up, reving high not wanting to shift and when it does its a hard shift and it shifts back and forth alot. Ive tried a couple different VSS the wiring from it looks good, I took the Psom out unpluged it and pluged it back together. nothing still.
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post #4 of 7 Old 01-01-2013, 07:30 PM
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May want to look into the range sensor on the side of the trans

1995 F350 XLT|DRW|7.3L Powerstroke|1.0 turbo|3" Diamond Eye Downpipe|Straight Piped|EBPV delete|DIY 6637|RiffRaff turbo inlet boot|203* thermostat|IDM mod|CCV|Built E4OD|Derale Trans Pan|Trans Temp Gauge|Explorer RAP RKE. Traded for a chevy

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post #5 of 7 Old 01-02-2013, 12:07 AM
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Quote:
Originally Posted by lib88stang View Post
The truck is shifts fine with OD off for awhile but after 20 miles atleast it starts acting up, reving high not wanting to shift and when it does its a hard shift and it shifts back and forth alot. Ive tried a couple different VSS the wiring from it looks good, I took the Psom out unpluged it and pluged it back together. nothing still.
Unplugging the PSOM usually doesn't do anything, you could try checking for cold solider joints but usually if it's bad you just need to replace it. Take a look at the junkyards or ebay, you should be able to get a PSOM for a somewhat reasonable price. The hard shifting is likely the transmission going into limp mode because it's confused about the speed.

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post #6 of 7 Old 01-03-2013, 01:35 AM
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My range sensor(I'm thinking it's called something else) is what triggered my rebuild. All new clutches, solenoid pack the whole nine yards. Over drive would drop out after a bit. Changed the sensor and no more problems in 6,000 miles.

1995 F350 XLT|DRW|7.3L Powerstroke|1.0 turbo|3" Diamond Eye Downpipe|Straight Piped|EBPV delete|DIY 6637|RiffRaff turbo inlet boot|203* thermostat|IDM mod|CCV|Built E4OD|Derale Trans Pan|Trans Temp Gauge|Explorer RAP RKE. Traded for a chevy

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post #7 of 7 Old 01-10-2013, 12:58 AM
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When you changed the vss did you change the diff. fuild ? If you didn't the metallics in the old fuild could interfer with the magnetic pick up causing a bad signal .
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