Transmission Diagnostic Help
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5th Gear
Joined: Oct 2023
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Transmission Diagnostic Help
Hello all. I’ve got a 99 f350 with a 7.3 (4R100 auto trans, 2wd). I have a relatively new rebuilt tranny with about 6k miles on it. Truck has 290k miles on it. Towed a fifth wheel with it all the way down to Arizona and back up to Washington, no problems.
it has now decided to hang up on 2nd gear, and not want to shift into third. It will shift after hitting about 2800 RPMs, or getting over 40mph. I can bump it out of OD and get it to shift normally when in second.
I took it to a transmission shop who did a diagnostic. No codes no nothing, but agreed it was hanging up on second. They quoted me 1,100$ for a new solenoid pack and filter, and to “inspect valve body and accumulator”. After doing some research, I’m concerned about just pulling the trigger on this. It seems like it may be more of an electrical issue rather than the pack. I’ve read that the harness, grounds, connections, pcm, relay, etc have been the culprits with peoples transmissions on these trucks.
With it being a new tranny, I’m skeptical. Especially with no codes or conspicuous readings from the shops computers. Anyone with any ideas or guidance would be appreciated. Thank you!
it has now decided to hang up on 2nd gear, and not want to shift into third. It will shift after hitting about 2800 RPMs, or getting over 40mph. I can bump it out of OD and get it to shift normally when in second.
I took it to a transmission shop who did a diagnostic. No codes no nothing, but agreed it was hanging up on second. They quoted me 1,100$ for a new solenoid pack and filter, and to “inspect valve body and accumulator”. After doing some research, I’m concerned about just pulling the trigger on this. It seems like it may be more of an electrical issue rather than the pack. I’ve read that the harness, grounds, connections, pcm, relay, etc have been the culprits with peoples transmissions on these trucks.
With it being a new tranny, I’m skeptical. Especially with no codes or conspicuous readings from the shops computers. Anyone with any ideas or guidance would be appreciated. Thank you!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
If it is an electrical problem there will be codes stored. The electrical tests are the most robust tests in the PCM. Either it isn't an electrical problem, the shop doesn't have the right tool to read the codes, or they are lying to you. I can't tell which one is true.
You could download Forscan at www.forscan.org for free. An adapter to plug into the OBDII connector is around $40. Then you could read the codes and know which one of those is true.
You could download Forscan at www.forscan.org for free. An adapter to plug into the OBDII connector is around $40. Then you could read the codes and know which one of those is true.
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