[TWILES]

I've been reading as much as I can find and I've gathered that it probably the solenoid there at the filter but here's my story.

At first it was just 1-2-1-2-1-2-1-2 and I really didn't think anything about it because it wouldn't do it all the time. I get in it the other day and the engine light is on. I take off down the rode and after about 1500 rpm its like its in neutral. I hit the gas and the tack goes up but thats it. I'm also going down hill. So I stop, shut the truck off, start it back up and it still won't shift to 2nd. I get mad and hammer it and it shifts at 2500ish. The rest of the gears seem to shift fine but from 1st to 2nd theres a problem. When I first take off, going down the same hill, if I let off the gas just right, it will shift into 2nd at 1500 but only that 1 time.

The truck is a 2005 2500 4x4 diesel with 98000 miles. I changed the pan fluid and filter at 60000 miles. I planned on waiting till 100000 to change it again. I guess it beat me to it.

I'm going to autozone in the morning and letting then tell me what the code is. Any help from you guys would be great. I belive Ican change the solenoid and the sensor myself but if its anything else, someone else will have to do it.

Thanks

 

[TXAustin]

Your GOV pressure is bad. I would get the upgraded GM unit.

 

[TWILES]

Is it very hard to put in?

 

[firefighter56]

Is it very hard to put in?

No, drop the pan, locate the solenoid, unplug wiring, remove 4 bolts pull out of trans. Re-install upgraded solenoid in reverse order. You will want to do a band adjustment while you are in there also. It is very easy too. I know that you need to tightne it to 72in pounds then back it off ?? turns and tighten jamb nut so it can't change. I don't remember how many turns to back it off, but I don't have an inch pound torque wrench so Bill Kondolay walked me through mine using a 1/4" allen wrench. You will locate the band adjustment, pull down the lever, insert the 1/4" allen wrench and tighten adjustment bolt down to snug but not tight, then retighten jamb nut. Done. Replace trans filter, reinstall pan and refill with ATF+4.
By the way, Autozone's scanner will not read our trucks, so don't waste you time and fuel going down there. If you know someone that has a Bully Dog Triple Dog or a Smarty call them up and have them read it for you.

Doug

 

[TWILES]

Its 2nd gear. He said that it wasn't holding 1st too long, it was skipping 2nd and going to 3rd. $1400

 

[cerberusiam]

Before you spend a lot of time and $$ run the front band adjustment to see if you have a problem there. The gov solenoid won't cause you to loose 2nd, its probably a mechanical thing with the band, band strut, or servo.

Check your adjustment first and see if you can get it to find 2nd. If you have less than 2 threads on the set screw afte rtightening the jam nut its either drop the pan and VB or the trans. You can loose 2nd gear from the band strut just falling out and still have a good band.

 

[airforcegooding2005]

No, drop the pan, locate the solenoid, unplug wiring, remove 4 bolts pull out of trans. Re-install upgraded solenoid in reverse order. You will want to do a band adjustment while you are in there also. It is very easy too. I know that you need to tightne it to 72in pounds then back it off ?? turns and tighten jamb nut so it can't change. I don't remember how many turns to back it off, but I don't have an inch pound torque wrench so Bill Kondolay walked me through mine using a 1/4" allen wrench. You will locate the band adjustment, pull down the lever, insert the 1/4" allen wrench and tighten adjustment bolt down to snug but not tight, then retighten jamb nut. Done. Replace trans filter, reinstall pan and refill with ATF+4.
By the way, Autozone's scanner will not read our trucks, so don't waste you time and fuel going down there. If you know someone that has a Bully Dog Triple Dog or a Smarty call them up and have them read it for you.

Doug

Ive taken my 08 2500 to autozone to have them scan it and it read it

 

[06TowRig]

dont mean to steal a thread

but i have this problem also and no one has been able to help. i replaced the transducer and went to a gm governor pressure sensor and the problem still continues. i adjusted my band probably 10k ago should i check to do it again? i called hts and was told i could adjust the shifting to shift earlier under light throttle conditions by turning a certain bolt on the valve body clockwise but i didnt do it because the problem is at WOT as well. only it shifts under light throttle at 2500 and at WOT my truck will rev all the way to 3600 until i let off the pedal just right..What could it be?

 

[cerberusiam]

but i have this problem also and no one has been able to help. i replaced the transducer and went to a gm governor pressure sensor and the problem still continues. i adjusted my band probably 10k ago should i check to do it again? i called hts and was told i could adjust the shifting to shift earlier under light throttle conditions by turning a certain bolt on the valve body clockwise but i didnt do it because the problem is at WOT as well. only it shifts under light throttle at 2500 and at WOT my truck will rev all the way to 3600 until i let off the pedal just right..What could it be?

It sounds like you have too much TV pressure in the system and the gov pressure can never override it correctly for a shift. The adjustment HTS told you about will effect the shifting across the range of rpm's so thats a good place to start.

These transmissions need to be tuned to the vehicle and since the 06's have a TTVA motor you may have to adjust until you find the sweet spot.

 

[06TowRig]

o and a side note im showing a little less than 2 threads on my forward band adjustment bolt when the jamnut is set could that be relevant?