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1st thing in the morning. Truck will not enguage into D. I can put gear selector in D but the transmission will not enguage.....I can pull it down to 1 or even 2 and it will enguage and go just fine....after I start off in low gear then I move selector up to drive and all is well.......
throughout my day all is well....can crank up drop her down in drive and go......
this only happens after the truck has sat overnight....
Any ideals?
This is started with it sometimes taking a while to enguage into drive after selecting it.....then it got to this point....
Low fluid level, ATF filter clogged, ATF pump worn/binding, main shaft worn/damaged, regulator valve, range sensor, and then there is the shift cable, out of adjustment or the connection between the cable and trans or body is worn.Past that you are looking at pressures, valves, and the various solenoids inside. There is a line pressure test port on the side of the transmission. It is a M10x1.0 thread-don't use a NPT adapter as that will hose the case. Any codes or pending codes?
Last edited by TomTommy; Nov 27, 2017 at 07:28 AM.
Reason: somehow went to bold print
No codes, fluid level is good, haven’t changed it in a while but it looks good was going to do that here shortly. Cable is good i can feel it trying to engage. Sometimes if i sit there for a while it will go......
Short of a line pressure test, shoot from the hip answer would be a torque converter issue. Possibly a shift solenoid. Have you checked your air filter, fuel filter? If the engine is not making the requisite torque is can affect the transmission? Long shot, but it is in the flow chart.
There are some notes regarding the IVB bolts loosing torque over time-causing low line pressure and internal leakage. 14 ftlb is the spec. If you are going to drop your pan and change the filter it would be a good time to check that out. Check the magnetic drain plug closely-
There are some mods out there for the 4R100. Sonnax appears to be popular. Trans-Go is another option.
Thx....yes i was planing on doing a fluid/filter change but wanted to gather all the info i could b4 going in there.......
thanks again....i really dont think its an issue of low pressure. Simply because after i pull it into low and go about my way. It does great all day long. With no issues....
i was thinking maybe something is clogged up.....
i dont have any knowledge about trannies. So shooting from the hip here....
Well, start small and work big.
Change the filter and check the torque on the IVB...that is the easiest.
There may be some crud and corruption in the galleries that gets dislodged when you shift into the lower gears. With any amount of luck a drain, filter, fill will solve your issues. Check that drain plug closely, if it is junked up you may have bigger snakes lurking.
Good luck, let us know how it goes!
Short of a line pressure test, shoot from the hip answer would be a torque converter issue.
How would a converter not work cold, but work later? Not possible.
Originally Posted by TomTommy
Possibly a shift solenoid.
Also not possible. No matter what the shift solenoids do or do not do the transmission can always engage a forward gear.
Originally Posted by TomTommy
Have you checked your air filter, fuel filter? If the engine is not making the requisite torque is can affect the transmission? Long shot, but it is in the flow chart.
Very, very long shot. If the engine is running it can engage a gear. If the filters are bad it may not have the power to move, but it will engage.
Originally Posted by TomTommy
There are some notes regarding the IVB bolts loosing torque over time-causing low line pressure and internal leakage. 14 ftlb is the spec.
That is very likely the problem.
Originally Posted by Lawnpro979
thanks again....i really dont think its an issue of low pressure. Simply because after i pull it into low and go about my way.
It does great all day long. With no issues....
That could be the bolts mentioned above, or even a bad seal in the forward clutch. Pulling it into low increase pressure, so you have proven it is a pressure issue.
Originally Posted by Lawnpro979
i was thinking maybe something is clogged up.....
i dont have any knowledge about trannies. So shooting from the hip here....
What would be clogged? If you mean the filter, the only way that gets clogged is when the transmission fails. So if the filter is clogged you need a rebuild.
There is no leaks. I checked that out very intense....will do a fluid change and get back to post...
Is there anything, anyone can think of that i can look at while i have the pan off?
thanks again
Yes, you need to take off the valve body and check the feed bolts for leaks. The way to check for leaks is to check the torque on the bolts. They need to be at 14 lb-ft or they will leak.
You won't see fluid coming out of the trans. You just won't have drive sometimes.
It was very clean. No metal shavings......250,000 miles on truck. It prob had 100,000 plus on this change
it didn’t have the magnet in the pan and it did have a drain plug.
I wont know anything until tomorrow when i try to drive it....
I just lost my forward gears. Still had reverse. I checked feed bolts. They were loose so I tightened them down. Unfortunately it did not work. I guess I'm looking at a rebuild.