97 K1500 fuel pump and engine issue

[bbullsj]

I feel like that's not a decent answer because I didn't have any trans problems before the repair. Is that something that can be caused by the trans economy relearning? Maybe it's a common problem with 4l60e's and I've just never had to work on one other than mine?

[j cAT]

Originally Posted by bbullsj

I feel like that's not a decent answer because I didn't have any trans problems before the repair. Is that something that can be caused by the trans economy relearning? Maybe it's a common problem with 4l60e's and I've just never had to work on one other than mine?

45 MPH is why this is most likely the problem . don't know what your tranny fluid is or condition or what your servicing schedule is but, if there is DEXRON III USED IN THIS TRANNY THEN fluid/filter servicing should be done less than 40 K miles.

dexron III turns to acid after 20K miles the more miles the greater its acidic level increases. this is why when using this NOW removed GM fluid spec is no longer used by GM. fluid turns gray , that is the metal ,that is eaten.

[bbullsj]

Could I just buy a new TCC solenoid and replace the bad one or is it the fluid that is doing it? A new sensor is $35. Do you have to drop the valve body to replace it or just the pan and filter? Is the Dexron VI compatible with that tranny?

[j cAT]

Originally Posted by bbullsj

Could I just buy a new TCC solenoid and replace the bad one or is it the fluid that is doing it? A new sensor is $35. Do you have to drop the valve body to replace it or just the pan and filter? Is the Dexron VI compatible with that tranny?

Again dexron III is NOT the proper fluid for your vehicle or any other GM transmission. this fluid is not an approved GM fluid , this was done by GM in 2006. This was done by GM because this defective fluid caused them to go into bankruptcy . had huge costs on the defective fluid .Dexron III is not synthetic. dexron VI is synthetic.
your fluid is now dexron VI. that is the correct fluid.

I have used mobil synthetic transmission fluid since 2000. this is before dexron VI existed. its called dexron/merc tranny fluid synthetic.

CALL UP THE DEALERSHIP PARTS DEPARTMENT THEY WILL TELL YOU DON'T BELIEVE WHATS STATED ON THE INTERNET !
Because GM is in the vehicle selling business they do not gain by you operating a vehicle they make longer than 120K miles. This is why this change was never reported to the owners it was aTSB. Top Secret Bulletin.

BEFORE YOU DO THIS YOU USE THE TRANSMEDIC TRANSMISSION TREATMENT FOR A FEW HUNDRED MILES.

then you drop pan replace fluid and filter. wash the pan so its clean. since the TCC does work but not properly this may be due to BAD fluid/filter.

so do that first .

Then the sludge will be loosened so that when you do the fluid servicing it will be cleaned.

after that is done and its cleaned inside drop pan again and replace the TCC valve body and solenoid if its required .

what are your tranny fluid servicing intervals ? what fluid have you used ?

your comments if this was never done before by you have a transmission shop do the work . make sure they use the dexron VI not the dexron III.. tranny shops still use dexron III because it insures continued repair work. also this fluid is practically free.
DEXRON VI COSTS $8-10 A QT..

[bbullsj]

I have been using dex/merc tranny fluid, but not Mobile1 brand. I believe it was Valvoline. I don't remember when I changed the tranny fluid last but I'm sure it could stand to be done. I don't drive it a whole lot and when I do it's to town and back (30 miles round trip). I will try the transmedic and then a fluid and filter change.

[j cAT]

Originally Posted by bbullsj

I have been using dex/merc tranny fluid, but not Mobile1 brand. I believe it was Valvoline. I don't remember when I changed the tranny fluid last but I'm sure it could stand to be done. I don't drive it a whole lot and when I do it's to town and back (30 miles round trip). I will try the transmedic and then a fluid and filter change.

remember if it says its synthetic fluid and is GM dexron VI spec then it is the correct fluid. I still use the older synthetic fluid for GM transmissions because I did not want to change the fluid synthetic types so I stayed with mobil synthetic for GM transmissions. never had a problem still run these vehicles 1996/2000 .

[bbullsj]

Does it have to be synthetic? So, I can put dexIII synthetic or dexVI non synthetic or synthetic?

[j cAT]

Originally Posted by bbullsj

Does it have to be synthetic? So, I can put dexIII synthetic or dexVI non synthetic or synthetic?

dexron VI is synthetic . mobil synthetic dexron/merc is synthetic that is what I have used for many years to avoid the dexron III damage I knew before GM admitted this defective NON SYNTHETIC FLUID fluid.

Just go to the auto parts store and buy 5-7 qts of the dexron VI and get a new filter shallow pan or deep pan with a rubber pan gasket . torque the pan gasket to 7 ft LBS,

some trucks come with a shallow pan. my car has the 4l60 shallow pan the truck has the deep pan. you must get the correct fillter or issues on fit /it may fall of if the shallow filter is used in the deep pan . deep pan takes 1.5 qts more fluid.

[bbullsj]

Not to go on the cheap side of things, dexVI is $7 a quart and I found Mobile1 full synthetic for $2 a quart. It was on clearance at AutoZone. Would I be fine using the Mobile1?

[j cAT]

Originally Posted by bbullsj

Not to go on the cheap side of things, dexVI is $7 a quart and I found Mobile1 full synthetic for $2 a quart. It was on clearance at AutoZone. Would I be fine using the Mobile1?

I did not see this at my auto zone. this is what I use https://mobiloil.com/en/automatic-tr.../synthetic-atf this costs me $8/QT at another store some charge $9.79 a QT. if you can get this for $2 then that is a great deal. I will have to call my store to see if this is also being discounted.

I called up the AZ stores near me NO discount $10... a QT......I normally use another store where I get a discount on the fluid. AZ is too expensive.

[bbullsj]

That's what it is. I guess I'll use that then and I'll go back and buy all they had.

[bbullsj]

So I ran the trans medic fluid for about 200 miles and then did a drain and fill along with a filter change using Mobil1 ATF. I also purchased a TCC solenoid from GM and replaced that while I had the pan off. For about 50 miles the tranny shifted great but now with about 200 miles, it has the same issue. It won't do it if it is cold, the longer I drive the truck the worse it gets until it drops out and then back in like it did before. Any other suggestions?

[bbullsj]

So after messing with for a very long time I got the new injection system warrantied out and everything is working fine like it should be. Possibly a bad part, i'm not sure but it's running great again with no issues. There were no issues with the transmission, it was all with the new injection system.

[j cAT]

Originally Posted by bbullsj

So after messing with for a very long time I got the new injection system warrantied out and everything is working fine like it should be. Possibly a bad part, i'm not sure but it's running great again with no issues. There were no issues with the transmission, it was all with the new injection system.

so the injection was interfering with the tranny operation ?

how does the tranny upshift now when cold . when going into reverse from D does it engage quicker with the synthetic ?

[bbullsj]

Yes, it was. I haven't noticed anything different with the trans after switching fluid.