Fill it up again Dummy
Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
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IIRC the speedo is connected on the rear differntial with a pigtail, make sure that is plugged in and not damaged. You might follow it down towards the cab and make sure it wasn't damaged during trnsmission work.
What year truck is it? If it's a late 2004 and later the ICP is on top of pass valve cover, take a close look at it. If it's leaking oil through the pigtail plug then yes it's bad. The ICP is a variable resistance pressure sensor and it controls to the IPR to regulate hpo pressure. If the pigtail has oil in it there is a certain amount of resistance right there and it will screw up the settings for the IPR. Damaged wires to the ICP will also throw a code.
I tell people this all the time so here it goes again: You absolutely need to have a monitor for the engine especially for the 6.0. These engines are complicated and they are 100% computer dependant to run. The good thing about that is you can monitor the same thing the computer does. The gauges in our trucks suck, to be honest and you can purchace a ScangaugeII at Auto Zone for only $160.00 they have then in stock on the shelf. With that thing you can read/clear codes and most importantly use it for the engine gauges. You can monitor coolant/oil temps/ turbo/egr/maf/map/icp/ipr/ficm/ the list goes on virtually everything the computer monitors.
I had my truck for years before I bought one and I can say it was by far the best money I ever spent on it. You can diagnose your truck yourself and you can always list your values here on this forum and everyone will help you figure out remedy. Without a scantool all you can do is guess!!
Now there are many brands out there available, even apps that you can use a smart phone to monitor. Take a look at the ICP and rear diff wiring to see if it's something simple. BTW the ScangaugeII when left plugged into the OBDII port becomes another set of gauges for your truck that are crazy precise.
Sorry about the crazy long post. lol
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2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
CAT EC-1 Coolant, IPR Coolant filter
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 w/ AGM regulator
Die Hard Platinum AGM all 2/0 Cables
Fabtech Radius Arms
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
2000 Watts of McIntosh Bliss
All riding on some Fatty-Daddy 38/15.50/18 Toyo's