5R110 Erratic shifting - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 02-23-2015, 02:25 AM Thread Starter
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5R110 Erratic shifting

Hi Guys,

I need some help. I recently started experiencing erratic shifting. Finally got a code P0766 for the direct solenoid. I replaced it and the EPC solenoid with aftermarket units. Also converted to the 08 filter and deeper pan. Just took it for a test drive and no better. In fact it is probably worse. It shifts very hard from 3-5 and then downshifts and the does the hard 3-5 shift again. When I get it calmed down and into 5th it will then downshift again. I now just got a code P0700. Anyone have any ideas? Or am I screwed and its rebuild time?

FYI it's an 06 dually tuned by innovative. It does this tuned or stock


06 F-350 4x4 CC LB Tow Boss Lariat 6.0l auto. Banks PowerPDA, Banks SpeedBrake, FICM Atlas 40 Tune, ARP Studs, PowerMax GT3788VA turbo, Homemade coolant filter, EGR valve delete spool, Monster Exhaust, K&N Cold air intake,Mishimoto Radiator,Husky mudflaps, Line-X bed liner, Recon lights, TUNED BY Innovative.
72 F-250 Gasser.FOR SALE
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post #2 of 2 (permalink) Old 02-25-2015, 05:25 AM
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Which type transm fluid was in the transm when the problem started ?

Which type fluid is the current fill ?

Mercon LV or Mercon SP ??

There has been some controversy about Ford now recommending Mercon SP again after they said earlier that Mercon LV was the approved replacement for SP because it was not going to be produced anymore, but now it is again.

All this may have nothing to do with your transm faults, but how did the fluid look in the bottom of the original pan when it was off...lots of small metallic shiny particles?...Burn't smelling fluid?

If so on either of the above , then yes, it's rebuild time.

I'm still running Mercon LV but will be switching back again to the SP. I have not had any issues so far with the LV, but one never knows.


Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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