Please help before I go bald!
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3rd Gear
Joined: Jul 2025
Posts: 3
Likes: 0
Please help before I go bald!
Well I'm ready to pull my hair out!
I have an early 99 250 7.3l that is having tranny issues 4r100. My trouble light started flashing a while ago. Forscan said my transmission temp sensor was bad. A couple days ago I replaced the solenoid pack and mind you the transmission was acting fine before this other than the code. After I replaced the pack it would die in reverse and bog hard in forward gears. After it warmed up reverse would be usable but all gears would still bog. Yesterday I put in yet another solenoid pack. Now reverse engages just fine with no bogging woohoo right. Wrong, now it dies in all forward gears no matter what. Is it possible I received 2 faulty solenoid packs or is something else wrong? Forscan says it is always commanding 1st gear. The gear indicator is working. I can not find any bare wires and the plug looks fine. The torque converter clutch is not activating either though thats what it acts like. What can I check next?
Please help, I need this truck.
I have an early 99 250 7.3l that is having tranny issues 4r100. My trouble light started flashing a while ago. Forscan said my transmission temp sensor was bad. A couple days ago I replaced the solenoid pack and mind you the transmission was acting fine before this other than the code. After I replaced the pack it would die in reverse and bog hard in forward gears. After it warmed up reverse would be usable but all gears would still bog. Yesterday I put in yet another solenoid pack. Now reverse engages just fine with no bogging woohoo right. Wrong, now it dies in all forward gears no matter what. Is it possible I received 2 faulty solenoid packs or is something else wrong? Forscan says it is always commanding 1st gear. The gear indicator is working. I can not find any bare wires and the plug looks fine. The torque converter clutch is not activating either though thats what it acts like. What can I check next?
Please help, I need this truck.
Last edited by Stealthshooter1; Jul 5, 2025 at 12:53 PM.
Thread Starter
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3rd Gear
Joined: Jul 2025
Posts: 3
Likes: 0
I do have the old one. Everything checks out on it but the temp sensor is bad. It reads open. I have pulled the wiring harness and checked it from end to end and ohmed every wire. I found zero problems. I'm starting to wonder if I need to replace the valvebody/solenoid pack gasket. Maybe it isn't sealing and it is cross flowing?
5th Wheeling
Joined: Dec 2020
Posts: 30
Likes: 11
Agreed. Put the original pack back in. Bonus: install a small piece of black tape over the warning light. If it's my truck I'm probably ignoring it tbh. Maybe check the fluid condition more often than usual. I've also heard of installing aftermarket temp sensors for these, maybe overkill in this case.
But seriously, reinstalling the original pack is easiest and fastest way to know if you just got bad solenoid units, or if you have bigger problems. Try that first!
Are you using aftermarket or reman packs? That's asking for trouble on electrical parts, in my opinion. I don't know if OEM units are still available. Check fordpartsgiant.com or similar or call a dealer. I'd honestly feel better with a junkyard pull than an aftermarket or reman.
But seriously, reinstalling the original pack is easiest and fastest way to know if you just got bad solenoid units, or if you have bigger problems. Try that first!
Are you using aftermarket or reman packs? That's asking for trouble on electrical parts, in my opinion. I don't know if OEM units are still available. Check fordpartsgiant.com or similar or call a dealer. I'd honestly feel better with a junkyard pull than an aftermarket or reman.
Thread Starter
|
3rd Gear
Joined: Jul 2025
Posts: 3
Likes: 0
Agreed. Put the original pack back in. Bonus: install a small piece of black tape over the warning light. If it's my truck I'm probably ignoring it tbh. Maybe check the fluid condition more often than usual. I've also heard of installing aftermarket temp sensors for these, maybe overkill in this case.
But seriously, reinstalling the original pack is easiest and fastest way to know if you just got bad solenoid units, or if you have bigger problems. Try that first!
Are you using aftermarket or reman packs? That's asking for trouble on electrical parts, in my opinion. I don't know if OEM units are still available. Check fordpartsgiant.com or similar or call a dealer. I'd honestly feel better with a junkyard pull than an aftermarket or reman.
But seriously, reinstalling the original pack is easiest and fastest way to know if you just got bad solenoid units, or if you have bigger problems. Try that first!
Are you using aftermarket or reman packs? That's asking for trouble on electrical parts, in my opinion. I don't know if OEM units are still available. Check fordpartsgiant.com or similar or call a dealer. I'd honestly feel better with a junkyard pull than an aftermarket or reman.
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