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Have a 15 with 185K on it and just started throwing a P1551 cylinder 1 injector circuit range/ performance code. Did some looking and what I found on it was the injector is probably going out. I’m going to check out the harness this weekend but my luck it’s most likely going to be an injector...

Ok guys, have an 08 with a mini running GH mcc tunes. Have noticed my FRP has been a little different for awhile now but never noticed any problems with drivability and just realized when the pressure changes, so I'm looking for some suggestions on what may cause this or maybe monitor. what I'm...

Bare with me, I'm bad with writing things out. Having an issue with what looks like white smoke out the exhaust. Seams to only happen cruising at highway speeds when it downshifts. I can roll into it and barely see anything but on a downshifts it will puff a good amount out also don't see...

Maybe needing a trans. Built trans is out of the question right now so looking for good 4x4 trans with TC to get me by for awhile. Thanks

Have been chasing a few issues with my truck for a month now, got everything figured out except for a 3-5 shift. If I was over half throttle it would fall on it's face on that shift, now today I got on it and really acted up on that shift. Wrench light and codes. P0766 Shift Solenoid D...

What is the shift pattern? I have been do some searching and I find it's a 3-5 shift. My truck I can count all the shifts and it hits 4th. Is it certain conditions for a 3-5 shift? Also, how hard is it on the trans to have the adaptive learning shut off? This is an 08 with gearhead tunes.

Need a little info/help. First off Matt has been trying to help me out with trans shifting, so a big thank you to him. ? is, with the custom tunes what kind of options should I have for the trans. Only things I can change are WOT shifts and shift firmness, is there supposed to be more?

Hey guys, want to know if this is possible before I contact Gearhead. Can these converters be tuned to lockup earlier and unlock later? Say lockup at 30-35 mph and unlock 25-30 mph.

Have a wierd issue going on. Started truck up this morning and battery light came on, charging at 14.6. So drove it to work, battery light and instrument cluster were going on and off for the 20 min. drive. Pulled codes. P008C Fuel Cooler Pump Control Circuit/Open P0563 System Voltage High...

I mean sell it. Just loaded up hot street on the 6.4, holy crap what a difference. Shifting couldn't be any better, fuel pedal isn't an on and off switch anymore and stopped the engine hiccup when the a/c comp kicks in. There's probably more but I only drove it a few miles so far. Nice work...

Trying to figure out if it's jut my truck or it's a normal thing. I noticed if the outside air temp is below 50 it doesn't have the power it does if it's above 50, damn thing is sluggish. Watching boost and EBP it's 1 to 1 when it's below 50 and really don't hear the turbo whistle, above 50...

Well did a search and only found one option to disable it. So, has anyone figured out another way to disable it or is it only with an H&S? If it's only with an H&S is there anybody in the NJ area with an H&S that would be willing to get rid of this damn light for me?

Anybody lower a 350 CC LB? Wondering what you guys did with the drive shaft support bearing? I have a slight vibration on take off and the angle of the shaft looks like crap.