E40D shift problems
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
What 628 is saying is that for the RPM, the gear the Computer has selected along with or not it applied the TC Clutch does not agree with the information it is getting from the PSOM.
So the computer thinks it has detected that the Transmission has slippage.
I would get that speedometer working right before doing anything to the transmission.
So the computer thinks it has detected that the Transmission has slippage.
I would get that speedometer working right before doing anything to the transmission.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
As said above you will need to either replace the PSOM or fix the rear end.
If the signal is week from the rear end you might try unplugging the RABS module and see if it works OK then. If so the gap may not be right between the VSS and the tone ring or a bad RABS module.
If the signal is week from the rear end you might try unplugging the RABS module and see if it works OK then. If so the gap may not be right between the VSS and the tone ring or a bad RABS module.
Thread Starter
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Senior User
Joined: Mar 2011
Posts: 117
Likes: 0
From: West Va
unplugged the VSS and the damn thing shifts fine (go figure) I'm gonna pull out the "NEW" VSS and see what I can find...what in the rear should I check....do I have to do anything with the gear set (please say no..lol)
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Senior User
Joined: Mar 2011
Posts: 117
Likes: 0
From: West Va
ok...getting ready to pull the rear diff out....what am I looking for that might be screwing with the VSS....and what is the best gear oil to put in...I was gonna go with Lucas because so far I love all the stuff the make....thanx
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
youll be looking at the Tone Ring, make sure its not bent or missing teeth.
If the rear diff has a LS in there be sure to add your friction modifier otherwise the LS will get damaged.
just curious what size tires are on the truck? its possible the PSOM needs recalibrated to the current tire size. it this isnt set correctly to what your running it will cause the tranny to not shift properly or accuratly.
you replaced the TPS, but did you make sure its operating in its proper range?
If the rear diff has a LS in there be sure to add your friction modifier otherwise the LS will get damaged.
just curious what size tires are on the truck? its possible the PSOM needs recalibrated to the current tire size. it this isnt set correctly to what your running it will cause the tranny to not shift properly or accuratly.
you replaced the TPS, but did you make sure its operating in its proper range?
Thread Starter
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Senior User
Joined: Mar 2011
Posts: 117
Likes: 0
From: West Va
don't know if you read earlier post kemi...when I unplug the vss...the truck shifts good...it has a new vss in it but I don't know how to check if it is good. The truck has stock everything....tires and all (so far...lol) will I be able to tell what the tone ring is just by looking at it? ...I cant find crap as far as pics of my diff...thanx
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