2008 Exploder O/D hangs in 1st gear, otherwise works well? | Ford Explorer Forums

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2008 Exploder O/D hangs in 1st gear, otherwise works well?

Jordan4461

Member
Joined
June 29, 2018
Messages
34
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5
Location
ZOO Parkway
City, State
Asheboro, NC
Year, Model & Trim Level
2008 Explorer Eddie Bauer
Howdy again!
My 5R55S transmission in the 2008 Exploder was rebuilt at 146,000 miles. It now has 192,000 miles. The transmission is a 5R55S. It hangs in 1st gear until I either let off the gas, at which time it shifts into 2nd and works fine thereafter, or I give it gas until it approaches redline, and then it will shift into 2nd gear. Throws CODE P0731. So, I drive it like a Granny. Reverse works fine. all other gears work fine.I typically turn the Overdrive off in city driving. The truck has recently decided to turn the dashboard O/D light completely dark, 5 minutes after I put it in drive with the O/D light lit up showing it has been selected to the OFF position. The tranny was overhauled by the previous owner's shop about 45,000 miles back, and is now exhibiting the delayed shift from 1st to 2nd gear. Other than that, it works well. Reverse engages promptly, as does 1st. It will kick down when asked. Local guy drove it, plugged it into a tester, looks at me and says all the gears are gone (even though they are each obviously shifting from 1 thru 5, and he wants $2200 to rebuild it. The last time it was rebuilt, receipt says they replaced the Solenoid Body, Pump Valve, Torque Converter, installed two sleeves, replaced 3 Bands and the Overdrive plate or planet (cannot read the receipt here). I only want to fix the 1st to 2nd gear flare, so that I don't have to worry about a redline shift or drive so slow as to back up traffic. The tranny works fine otherwise. If anyone has any suggestions or comments, I am all ears! I plan on going for a second opinion, but if anyone here has any inkling of the cause of my tranny problem, it would help when being sold a bill of goods.
Thanks...Jordan
 



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The P0731 is a gear ratio code for first gear, this is not a common code I see with this transmission, basically the computer is seeing a wrong reading for first gear from the speed sensors. This is not consistent with what you are describing the vehicle drives like, your description leads me to think a problem with 2nd gear which should produce a P0732 and P0735 code

When I see this code the transmission either it slips in forward due to a failure with the forward clutch or there is a problem with the OD planet that throws off the gear ratio, in both cases the transmission has to be removed and rebuilt.
 






Thanks for the info. The overdrive doesn’t feel quite right either. Any suggestion on a good quality remanufactured 5R55S unit?
The P0731 is a gear ratio code for first gear, this is not a common code I see with this transmission, basically the computer is seeing a wrong reading for first gear from the speed sensors. This is not consistent with what you are describing the vehicle drives like, your description leads me to think a problem with 2nd gear which should produce a P0732 and P0735 code

When I see this code the transmission either it slips in forward due to a failure with the forward clutch or there is a problem with the OD planet that throws off the gear ratio, in both cases the transmission has to be removed and rebuilt.
 






I just replaced the solenoid pack on my 2008 sport trac after engine light and wrench showed up on cluster I was told that the solenoid was bad. I didn't see anything that appeared to be normal in the pan or on the old solenoid. Bottom line shifting is very hard from 1st to 2nd and it will display either the engine or wrench on cluster all other shifts are fine and overall the transmission seems fine.... any clues and thanks in advance
 






I just replaced the solenoid pack on my 2008 sport trac after engine light and wrench showed up on cluster I was told that the solenoid was bad. I didn't see anything that appeared to be normal in the pan or on the old solenoid. Bottom line shifting is very hard from 1st to 2nd and it will display either the engine or wrench on cluster all other shifts are fine and overall the transmission seems fine.... any clues and thanks in advance

It's all going to depend on what the computer didn't like about how the transmission was working.

What is the code that was stored in the computer?


You should start your own thread for more responses, post up the code number and we can give you some ideas on what might be going on.
 






It's all going to depend on what the computer didn't like about how the transmission was working.

What is the code that was stored in the computer?


You should start your own thread for more responses, post up the code number and we can give you some ideas on what might be going on.
 






Will do as soon as I get the code thank you
 






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