e40d lock up/fourth gear issue
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e40d lock up/fourth gear issue
Alright guys, I've got problems. Originally upon purchasing this vehicle, I believed this vehicle was equiped with the 4.10 rear end. Upon further inspection, I discovered that I actually have the 3.55. Now, here's the issue: at 70 mph I cruise at 2400 rpm, occasionally (rarely) the vehicle will go in to either lock up or fourth gear and I will do the proper 2000 rpm at 70 mph.
Now what I have done is replace the ect sensor since it was sluggish. Next I plan to replace the vss. My question to you is what could possibly cause the transmission not to shift into fourth gear? I believe a solenoid could be bad, but the truck does occassionally shift into fourth gear, but rarely. Is there anything else I should look at? Does anyone know where a good place to buy an e4od is? Any help is appreciated.
OD does work by the way, just no fourth gear. With OD on, I do 2400 RPM, with it off I do 2800-2900 rpm at 70mph.
-Andrew
Now what I have done is replace the ect sensor since it was sluggish. Next I plan to replace the vss. My question to you is what could possibly cause the transmission not to shift into fourth gear? I believe a solenoid could be bad, but the truck does occassionally shift into fourth gear, but rarely. Is there anything else I should look at? Does anyone know where a good place to buy an e4od is? Any help is appreciated.
OD does work by the way, just no fourth gear. With OD on, I do 2400 RPM, with it off I do 2800-2900 rpm at 70mph.
-Andrew
Last edited by xxtavixx; Jun 20, 2007 at 07:23 PM.
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Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
What you're seeing is the TC not locking up. It has nothing to do with shifting. Overdrive *is* fourth gear, so that last statement doesn't make a lot of sense.
First thing I'd try is a flush and filter change. If that doesn't do it, then you might replace the solenoids.
The VSS has nothing to do with this problem.
First thing I'd try is a flush and filter change. If that doesn't do it, then you might replace the solenoids.
The VSS has nothing to do with this problem.
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Well, she went all day yesterday she went just fine all day long. I'm not sure why either, I was towing 1k lbs lol...I'm gonna get the codes scanned today. Thanks for the input. I'm wondering if I might have a lazy tach, it seems to jump a lot. Something I should look into. The reason this has been so frustrating is that the TC acts as though it's locked up when it's at the 2400rpm too.
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