Hi. I need help

So i've swapped trannie in my 1995 blazer 4.3 4x4 to one from a 1997 (guaranteed working) so the new trans is hooked up, first test drive i forgot to plug in the lambda sensor, and a plug on the transfer case. Then i got abs lamp, and no speedo, and the trans wont shift past 2nd. So i've plugged in the lambda sensor, and the one on transfer case, then the abs lamp stopped, and speedo is back, but the trans still won't shift right. It works fine in reverse,1st and 2nd, but does not shift past second! instead of shifting to 3rd, it's like it goes to neutral !

I am 100% sure, there is no slippage in any gear, the transmission simply don't shift to 3rd and further.

I dont think there is any mechanical failure, it has to be electrical.

I unplugged the TV cable on the transmission, and cleaned it. Sprayed it, and blew it clean with air.

So i thought, is there maybe a difference between model years in 4l60e?
If there is a difference on the solenoids, how do i find out, and can i swap all solenoids and complete harness from my old trannie? (clutches burnt). I'm hoping there may be other options before that.

I'm told i should read codes, but the scanner i bought doesn't fit since i have obd 1.5 (obd1 system with obd2 plug under dash)
So i bought an obd2 to usb cable i could hook up to my laptop, but if so i need software to read fault codes. I've got the Tunerpro (freeware), but haven't tested it yet. Anyone familiar with this program?

On the other hand, i've read about trannies going into "limp mode".
Can this be it? But if so, how do i get it out of limp mode?

Where i live, i don't have access to any good transmission workshops, the only workshops here, doesn't know anything about these cars.

I seriously need help, appreciate all response

 

Look at your old transmission. Does the pump (located in the very front of the transmission behind the torque converter) have PWM written on it? If not, that '97 transmission will not work in your truck. You cannot swap things around to get it to work either.

 

swarlkk, I did a search on this and found a posting that said that in 1996, GM changed the ohm rating in the 3-2 solenoid.Is this correct? I am assuming thats the shift point blazer888 is having a problem with. Just change out the solenoid.
blazer888, what kind of information did get you on this transmission being interchangable with your year and model?

 

There were other changes as well, but one of the first things is whether or not the original trans from a '95 is a PWM trans. There are MANY differences from non-PWM to PWM.

Next would be the 3-2 solenoid which is PWM in the PWM 95's and on-off in the '96 thru mid-97. The 3-2 solenoid & valve will not interchange between the '95 and the '96-'97. '95 is the red-headed step child year.

Nothing in the "No 2-3 shift or 2-3 shift slipping, rough, or hunting" chart lists as being electrical.

 

I see..that is good info to know. It is always good to do as much research as a person can before swapping parts from different years.

 

Ok, so if my old trannie actually has pwm written (will check later today), would it be an option to swap solenoids from my old trannie then? I was pretty stupid not to check before i swapped..

 

I Checked my old trannie, yes it says pwm *wohoo*... What should i do? Change all solenoids, or just one of them? I dont have any schedual over the trannie. Appreciate the help!

 

That is good. PWM = pulse with modulator.
swartlkk said the 1995 is a odd year for other parts to interchange with. If you re-read his post it says the solenoid switch probably would not work. You could try it, just to eliminate that question, but I do not know if the hole bore or area in you trans is the same.
The PCM= power control module or brain box is what decides what will work for the signals sent to the solenoids.

 

The solenoid & spool valve that it operates were changed. My ATSG manual states that they do not swap.

 

Ok. Well now i've changed all solenoids and complete harness from my old trannie, everything fits perfectly, but shifting is exactly the same.

But one thing bothers me... When i unplug the tv-cable and takes the car for a drive, everything is the same... Since i have no way of reading codes before next thursday (a local workshop will do a diagnose), Is there any way for me to measure the power to the trannie? I'm suspecting there is no power to the transmission.

Pcm/tcm blown? (i don't know where it's located)

Fuse blown? (the only fuse i've managed to find, is in the fuse box on drivers side in the car)

When i forgot to plug in the lambda-sond, it got a little burnt on the exhaust manifold, but i can't see any breakage in the wiring, looks fine.

I'm sorry if i'm hard to deal with, but another transmission swap is almost impossible for me now, i just have to eliminate everything else first.

I still appreciate the help