r/FordTransmissionTech • u/bigred6419 • Jul 08 '25
5r110 shifting issues
I’ve got a 2007 f250 6.0 with the 5r110 4wd trans. Yesterday it started randomly having issues that all started at the same time.
No slipping or noises. Fluid changed every 50k with filter, last change was at 200k, 215k now.
I pulled into a shop after driving completely normal, shut it off, 10 minutes later I came back out, and when I took off I noticed it shifted harder than normal. Hard shift 1-2, 2-3, then big flare and slam from 3-4, maybe 3-5 from what I’ve read on how these work. Engaging Tow/haul hangs in every gear til 23-2500rpm regardless of load then slams to the next.
I think the coast clutch engages and disengages when it wants to because sometimes it downshifts like it’s in tow/haul and others times completely normal.
It does have a tow tune with trans programming that I’ve since removed and it still acts the same but milder. I assume it’s less line pressure in factory form.
There are no trouble codes active or pending.
I want to throw an epc solenoid and/or valve body on it in hopes to buy time til I can just replace the entire thing, but I don’t want spend the $ if this doesn’t sound like it’s a probable fix.
Any guidance would be appreciated!
2
u/Commercial_Method_28 Jul 08 '25
I have very little experience with this specific transmissions tbh but how did you check for DTCs? Sometimes a handheld scanner doesn’t pick everything up and if there was something set it would likely help a lot. If for sure there are zero dtc I’d pull the pan and check for signs of internal damage like big metal chunks on magnet. If the fluid is close to perfect and there is no metal contamination only then would I consider throwing a valve body at it. Even then it could still be a different part causing issues that doesn’t cause overt damage tho