5R110 3rd Gear Issue
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3rd Gear
Joined: Dec 2025
Posts: 3
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5R110 3rd Gear Issue
Well after buying a 6.0 I always knew i'd end up on here but didnt think it'd be for the trans. About a month ago I bought a 2003 F-350 6.0 with the 5R110 trans. The entire truck has ran fine for a while but I have had to replace some things such as oil cooler and HPOP seals. Besides the motor, I have never had any issues with the trans. It hits each gear smoothly. Recently I brought the truck off-road which I have done before and had an injector failure. I was flat towed home in neutral which was around 5 miles. About a week later I replaced the injectors and the truck runs great. I went down the street and when the trans went into 3rd gear the truck hopped and went back into 2nd. I scanned the trans and found a P0730 and P2704 as well as a fault indicated in the "Low reverse clutch". I have checked the fluid which looks good but does have a little clutch material. I then replaced the Low/Reverse solenoid which is Solenoid E. Then I drove down the driveway and continued to have the same issue, the wheels locked up in 3rd gear and went back into 2nd. I put the truck into manual 3rd gear where it moved but was very tight. I'll add some pictures. If anyone has had a similar issue please let me know. Thanks
More Turbo
Joined: Nov 2009
Posts: 528
Likes: 278
From: Kansas
@Kwarren How fast did you go in that 5 miles of towing?
@Mark Kovalsky Are these trannys more susceptible to damage being towed than others? or was this just bad luck? 5 miles isn't very far, but if dropping a driveshaft is required then that's what I'll do if that time comes.
@Mark Kovalsky Are these trannys more susceptible to damage being towed than others? or was this just bad luck? 5 miles isn't very far, but if dropping a driveshaft is required then that's what I'll do if that time comes.
Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
Could it be like a bearing or something burned up vs a clutch the way it locks up in 3rd gear and clutch is aftermath
no trans fluid being pumped thru when towed and engine off seems like it would seize a bearing or something
no trans fluid being pumped thru when towed and engine off seems like it would seize a bearing or something
Last edited by BLADE35; Dec 29, 2025 at 09:08 PM.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
This trans doesn't like to turn without the engine running, which runs the pump. The trans ran for 5 miles with parts turning and no lube. It's not a burnt up bearing, though there could be some burnt up. What's causing the problem is that the clutch got hot enough that it welded itself together.
Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
This trans doesn't like to turn without the engine running, which runs the pump. The trans ran for 5 miles with parts turning and no lube. It's not a burnt up bearing, though there could be some burnt up. What's causing the problem is that the clutch got hot enough that it welded itself together.
ok that makes sense it’s welded with how it reacts
had me wondering cause a bad clutch alone just doesn’t propel the vehicle at all and his locked up
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