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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 01-21-2015, 09:30 AM
slinginsaws slinginsaws is offline
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carrier bearings and Speedo

So I am trying to get my old girl running better. One area that bothers me is the speedo wiggeling at 55-58 then it stops. starts again @70.
no weird codes so Im thinking it could be a the carrier bearings? I think I have read where this has been a solution for a similar issue. So here is the main question, How hared is it? will it mess with the rear ends jive? I have already blew up a 538 ring and pinion set doing 45 down the beach, and almost took out a Farriar with my Drop hitch.
thanks guys!
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Old 01-21-2015, 09:33 AM
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this question is for my DD that is all stock and 155xxx miles. the 538 gears are in my 93 With 40'S. its no longer on the road.
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Old 01-21-2015, 09:49 AM
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The speedo bouncing is usually caused by the vss being dirty or going out or the psom going bad.
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Old 01-21-2015, 09:54 AM
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I Did the VSS and it was fine. I thought that the PSOM was one that just goes out dead like.
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Old 01-21-2015, 10:40 AM
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Nope. Like any electronics, the PSOM can give the illusion of being just fine and then spaz out whenever it feels like it. Check the PSOM board for broken solder joints, leaking caps... the usual things you'd look for.

Also... unplug the RABS module can screw with the signal circuit, unplug the RABS and see if the speedo/PSOM behaves right.
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Old 01-21-2015, 11:40 AM
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Quote:
Originally Posted by dixie460 View Post
Nope. Like any electronics, the PSOM can give the illusion of being just fine and then spaz out whenever it feels like it. Check the PSOM board for broken solder joints, leaking caps... the usual things you'd look for.

Also... unplug the RABS module can screw with the signal circuit, unplug the RABS and see if the speedo/PSOM behaves right.

where and how do you get to the psom?
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Old 01-21-2015, 11:44 AM
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It's on the back of the speedometer inside the instrument cluster. So take the cluster out, take it apart, pull the speedometer out, and the PSOM is on the back of that. Subford has a picture of it I'm sure... but let me go look for one.
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Old 01-21-2015, 11:50 AM
slinginsaws slinginsaws is offline
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Thanks Dixie, Have you done this before in my 93 the bezel is all torn and cracked. is it tricky to remove it without damage? the 95 is in perfect shape and i really want to keep her that way
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Old 01-21-2015, 12:00 PM
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Okay, no go on the pic search.

Yes I have done it, you have to pry off the plastic trim strips on each side of the bezel. There's screws under there... take 'em out. Then remove the headlight kn0b by using a pick or something. Stick it in the slot on the side, lift the locking tab, pull it straight off.
Unplug the fuel switch, and any other wires going to the bezel controls.

Cluster comes out with 4 screws after that. To take it apart, take off the lens and pull each group of gauges straight out. Speedo comes out last. When you have the speedo in your hands turn it over and you'll see the PSOM board on the back of it. Unplug the ribbon cable and undo the (4?) screws holding it down, and there you go!
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Old 01-21-2015, 12:08 PM
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Awsome Dixie Ill give it a shot. hopefully this weekend i can start getting all this squared away.
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Old 01-21-2015, 12:08 PM
 
 
 
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