Well, I finished swapping a Carb 350 into my truck, I am using the stock TBI PCM to control the 4L60E. and here is how!
DO NOT ATTEMPT THIS IF YOU HAVE EMISSIONS!
Transmission Control Via TBI PCM:
First off, Here is what the PCM needs to operate the 4L60E
Now I did the exact same thing 04SilveradoMykk did in his thread with his Vortec PCM, But my truck was stuck in limp home mode.
Mykk's Thread-> http://www.gmfullsize.com/forum/showthread.php?t=145089
I am running a Stock GM HEI distributor, and it is what i would recommend for a similar swap, I WOULD NOT keep the TBI Distributor, you have no clue as to what the PCM is gonna do without seeing fuel.
Now with a TBI engine, there is no crank sensor telling the PCM if it's running.
It took me about a week to figure out what to do, but when I did its easy as 123.
Picture of wire with a quick disconnect.
![Image]()
Here is a picture of my TPS on my Speed Demon 650CFM
![Image]()
Picture of the whole setup
![Image]()
Here is a Video of me leaving my driveway, as you can see my tranny is functioning properly (I still manually shift it) if the purple/white wire wasn't hooked up, I wouldn't get 1st or OD.
![Image]()
As you can see in the video, my Speedo, Coolant temp, and all other gauges work like factory (My Oil PSI gauge isn't working cause my Oil Sender is gone, Replaced with an Autometer unit)
So now that your 4L60E is working, let's carry on to Fuel.
Fuel:
I sent up my fuel system a little differently than Mykk, Here is what i used.
It is VERY Important that if you are keeping the stock pump, you HAVE to have a return, I don't care what anyone else says, just capping off the return is gonna kill the pump, THE RETURN IS THERE TO COOL THE PUMP!
Picture of my setup.
![Image]()
Those are the stock TBI Fuel Lines. I just bent them a bit and cut off the fittings and installed some new ones.
I then ran a hose barb out the left side to the carb, shown here.
![Image]()
At first, it ran great, but I still wanted to check my PSI, so I added a gauge. using some fittings we had laying around, I don't have any pictures of it, sorry.
I found that my demon likes 6.5-7PSI. and the Holley Regulator is factory set at 5PSI.
After this, the engine ran very well, I would recommend this swap to anyone wanting a bit more out of their engine.
-Josh
DO NOT ATTEMPT THIS IF YOU HAVE EMISSIONS!
Transmission Control Via TBI PCM:
First off, Here is what the PCM needs to operate the 4L60E
-VSS
-CTS
-TPS
-A RPM Signal
Now I did the exact same thing 04SilveradoMykk did in his thread with his Vortec PCM, But my truck was stuck in limp home mode.
Mykk's Thread-> http://www.gmfullsize.com/forum/showthread.php?t=145089
I am running a Stock GM HEI distributor, and it is what i would recommend for a similar swap, I WOULD NOT keep the TBI Distributor, you have no clue as to what the PCM is gonna do without seeing fuel.
Now with a TBI engine, there is no crank sensor telling the PCM if it's running.
It took me about a week to figure out what to do, but when I did its easy as 123.
1. Find the plug that used to plug into the Distributor and lead to the PCM.
2. Find the Purple/White wire
3. Take Wire and run it into the TACH position on your HEI Distributor.
4. Done!
Picture of wire with a quick disconnect.
Here is a picture of my TPS on my Speed Demon 650CFM
Picture of the whole setup
Here is a Video of me leaving my driveway, as you can see my tranny is functioning properly (I still manually shift it) if the purple/white wire wasn't hooked up, I wouldn't get 1st or OD.
As you can see in the video, my Speedo, Coolant temp, and all other gauges work like factory (My Oil PSI gauge isn't working cause my Oil Sender is gone, Replaced with an Autometer unit)
So now that your 4L60E is working, let's carry on to Fuel.
Fuel:
I sent up my fuel system a little differently than Mykk, Here is what i used.
- Stock TBI In-tank Pump
- Holley 12-803BP ByPass Regulator (http://www.summitracing.com/parts/HLY-12-803BP/)
- Marshall 0-15PSI Gauge, (Not shown)
It is VERY Important that if you are keeping the stock pump, you HAVE to have a return, I don't care what anyone else says, just capping off the return is gonna kill the pump, THE RETURN IS THERE TO COOL THE PUMP!
Picture of my setup.
Those are the stock TBI Fuel Lines. I just bent them a bit and cut off the fittings and installed some new ones.
I then ran a hose barb out the left side to the carb, shown here.
At first, it ran great, but I still wanted to check my PSI, so I added a gauge. using some fittings we had laying around, I don't have any pictures of it, sorry.
I found that my demon likes 6.5-7PSI. and the Holley Regulator is factory set at 5PSI.
After this, the engine ran very well, I would recommend this swap to anyone wanting a bit more out of their engine.
-Josh
