47re no good when warm?
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Up for an experiment?
Take the truck out, and drive it till its warm, and starts acting up. Disconnect the electrical plug (eight pin, i think) on the drivers side of the trans. This will force the governor to constant max pressure, and you will have ZERO automatic function. Trans will only shift if and when you tell it to. Take the truck for a drive, and manually shift the gears. If that works good, then, your pressure sensor or solenoid are bad. (if you got reman units, it wouldn't be that much of a surprise. Even if you got 'new' ones, not like I have never gotten a bad part right out of the box before.)
Take the truck out, and drive it till its warm, and starts acting up. Disconnect the electrical plug (eight pin, i think) on the drivers side of the trans. This will force the governor to constant max pressure, and you will have ZERO automatic function. Trans will only shift if and when you tell it to. Take the truck for a drive, and manually shift the gears. If that works good, then, your pressure sensor or solenoid are bad. (if you got reman units, it wouldn't be that much of a surprise. Even if you got 'new' ones, not like I have never gotten a bad part right out of the box before.)
Did buy "new" solenoid and sensor, but I agree, wouldn't be the first time I had a bad electronic part that was new in the box.
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Okay, first thing I did today was replace the tranny cooler. The aftermarket unit that was on the truck had seen better days and there was a partial crimp in the tube (tube/fin style) which looked like it may have been diminishing flow. Looks like the truck was in an accident at some point and the top of the front bumper pressed into the tube between the fins. Anyway, I replaced it with a larger flat plate style. I was alarmed as I am now noticing that the fluid passing through the cooler is hotter than I think it should be. I don't have a tranny temp gauge, but the cooler is very hot to the touch while before it never seemed to get past warm. I'm wondering if the old cooler was flowing much of anything at all.
On to the "experiment." Disconnecting the electrical plug on the transmission seems to have little effect if any at all on the operation when it is all warmed up. Manually shifting to first would very rarely do anything, much as it does when the connector is hooked up. The only difference I noticed was that in "D," the truck would pull away in 3rd gear if it moved at all.
As a little more information, if the truck is on a slight incline hill and is all warmed up, it will sometimes hold itself but not pull away with throttle, sometimes roll backwards as if in neutral even with throttle, or sometimes attempt to pull away with throttle as if I was reeeaaallly slipping a clutch in a 5 speed.
Why would the fluid be so hot even with the vehicle sitting for 15 minutes in neutral? What could be causing the excessive fluid temperature and could it be ralated to my issue or the cause?
Oh yeah, and reverse is still perfectly fine through all this. No slippage or engagement issues at all!
On to the "experiment." Disconnecting the electrical plug on the transmission seems to have little effect if any at all on the operation when it is all warmed up. Manually shifting to first would very rarely do anything, much as it does when the connector is hooked up. The only difference I noticed was that in "D," the truck would pull away in 3rd gear if it moved at all.
As a little more information, if the truck is on a slight incline hill and is all warmed up, it will sometimes hold itself but not pull away with throttle, sometimes roll backwards as if in neutral even with throttle, or sometimes attempt to pull away with throttle as if I was reeeaaallly slipping a clutch in a 5 speed.
Why would the fluid be so hot even with the vehicle sitting for 15 minutes in neutral? What could be causing the excessive fluid temperature and could it be ralated to my issue or the cause?
Oh yeah, and reverse is still perfectly fine through all this. No slippage or engagement issues at all!
Last edited by JabaThaHut; May 12, 2011 at 04:16 PM. Reason: Forgot to add comment on reverse
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From: Clayton MI
Is the fluid level up to snuff? Gotta check it in neutral, park will give an inaccurate reading.
If the fluid level is good, might be time to have the pressures checked when the trans is hot.
If the fluid level is good, might be time to have the pressures checked when the trans is hot.
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Looks like I'm gonna have to give in and bring it down to the shop for them to look at. I don't know anyone around here with a gauge I could borrow nor do I have a 0-300psi oil gauge. I'm fearing the worst.
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From: Vancouver
Yep, fluid level is perfect in neutral when hot with the truck on level ground.
Looks like I'm gonna have to give in and bring it down to the shop for them to look at. I don't know anyone around here with a gauge I could borrow nor do I have a 0-300psi oil gauge. I'm fearing the worst.
Looks like I'm gonna have to give in and bring it down to the shop for them to look at. I don't know anyone around here with a gauge I could borrow nor do I have a 0-300psi oil gauge. I'm fearing the worst.
So did you ever fix it?