4l60e limp mode

Asked by Aug 06, 2017 at 06:33 PM about the 1996 GMC Sierra 1500 C1500 SLE Extended Cab Stepside SB

Question type: Car Customization

I put older 383 with vortec heads and carb
on truck, now I have 2nd,3rd,and reverse, the
person helping me cut front o2 senors, what
do I need to be hooked up and do you have a
diagram you can post I can follow, thanks

1 Answer


The 4L60E transmission needs some inputs from the factory computer to operate. I leave the computer in the truck and just disconnect what is not needed for the fuel injection system. This way the trans gets power and ground, coolant temperature and vehicle speed. You will need to give the computer tach signal from your distributor. find the correct tach signal wire in the connector that went to the old F.I. distributor and connect it to the tach terminal on the distributor you are now using. The last part is a bit trickier. You need a throttle position sensor. Holley sells a kit for their carbs for about 130 bucks. But you can make an adapter for your carb if you are handy.

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