Leaderboard

This is actually after I've consolidated all the LS4 and Z34 wiring. There are no extra wires left in this picture. It really looks worse than it is. Theres really only a few main bundles to sort through, otherwise the rest are categorized based on component/ sensor, etc. with labels at the PCM end so I can keep track of everything. The foreground bundle is the original Z34 front end harness that has the battery cable, ground cable(s), fan wiring, and any accessories on the drivers side of the engine bay, so it'll be returned back to the bottom of the radiator support. I had to take it apart to rid it of the old 4T65 wiring and some other bits.

Yeah, well, somewhere north of $2500 for a rebuilt trans doesn't make me fell all warm & fuzzy. If you were able to find a good LOW mileage 4T60-E, but when it comes to salvage yards one doesn't know what the history is of the car it came out of.

I think you're barking up the wrong tree...... 1870 is a slipping TCC clutch situation, may or may not be in the valve body, the solenoid is not in the pan, it's in behind the rear trans cover. The trans has to come out to get that cover off. Now the reason why the clutch is slipping could be low pressure to the converter lock up shaft (diagnose the source), the clutch plate has worn off the friction material so it won't remain solid in place against the inside of the turbine impeller housing, the clutch plate bearing assembly is failing or the TCC solenoid is failing.

I’ve replaced the valve body on a 04 explorer. It did not fix the problem I had but was not a hard job really. The valve body pistons on my exploder were cracked and would leak down causing the bands to lose tension but not likely what you’re dealing with but I read it could be… The valve body replacement is Messy… you need to be very clean as you go. Keep a piece of cardboard nearby and draw the bolt locations on it and stick em in so they all go back in the right spot. Have a 1/4” drive torque wrench available. you might want to do more troubleshooting first though. Could simply need a fluid change or be other things. The valve body being bad is a culprit so I wouldn’t send it back yet. Read up if you can’t figure out a likely cause before you open it up, maybe get some more parts for a ‘while you’re in there’ scenario. I hate doing shit twice. The TCC solenoid and the TCC itself is also a culprit. https://obd2pros.com/dtc-codes/p1870/ https://www.motor.com/magazine-summary/deciphering-gm-transmission-dtc-p1870-june-2006/ looks like YouTube has some diagnostic vids as well. good luck man.