Galane
Full Access Member
- Joined
- Jun 28, 2014
- Posts
- 149
- Reaction score
- 38
- Location
- Idaho
- First Name
- Gregg
- Truck Year
- 1982
- Truck Model
- Sierra 3500
- Engine Size
- 350
I have a 1982 GMC Sierra 3500
https://www.flickr.com/photos/27748767@N08/sets/72157644959205217/
350, 4.56 rear gears, no AC, no cruise, no dome light, no nothing but power steering, power brakes and automatic transmission. (But it does have an AM/FM radio, such luxury!)
I've pulled a running 350 with TBI and 700R4 from a 1991 standard cab Chevy 2500. Got the engine wiring that goes through the firewall and to the ECU, and the ECU. Didn't grab other things that connect to other connectors in that harness, if there's some of that I need I can still get it for no extra $.
Question time. The 91 has the electronic speedometer.
How can I retain that input for the computer AND drive the 82's mechanical speedometer?
I've heard there are ways to eliminate that input but also that the TBI works better and will have better MPG with the speed input. This swap is all about improving MPG and reliability. The extra horsepower over the 1982's 160 will just be a bonus.
Is there a 4-speed shift indicator I can retrofit in place of the original 3-speed one?
Do I need to change anything in the column shift?
What about the neutral/safety switch?
Will the 91's ECU chip need reprogrammed for the 4.56 ratio? (OD will drop final ratio to 3.17.)
Any mechanical bits won't be a problem. I can build, buy or farm out all that. Changing the driveshaft length is as easy as taking it to Connie's and telling them how long to make it.
I've done plenty of engine and transmission swaps on cars from the 40's to the 00's and one non-electronic 700R4 into a 1978 Chevy van, but this is my first go with stuffing a drivetrain with electronic systems into a vehicle that barely has any transistors - just electronic ignition and the radio.
https://www.flickr.com/photos/27748767@N08/sets/72157644959205217/
350, 4.56 rear gears, no AC, no cruise, no dome light, no nothing but power steering, power brakes and automatic transmission. (But it does have an AM/FM radio, such luxury!)
I've pulled a running 350 with TBI and 700R4 from a 1991 standard cab Chevy 2500. Got the engine wiring that goes through the firewall and to the ECU, and the ECU. Didn't grab other things that connect to other connectors in that harness, if there's some of that I need I can still get it for no extra $.
Question time. The 91 has the electronic speedometer.
How can I retain that input for the computer AND drive the 82's mechanical speedometer?
I've heard there are ways to eliminate that input but also that the TBI works better and will have better MPG with the speed input. This swap is all about improving MPG and reliability. The extra horsepower over the 1982's 160 will just be a bonus.
Is there a 4-speed shift indicator I can retrofit in place of the original 3-speed one?
Do I need to change anything in the column shift?
What about the neutral/safety switch?
Will the 91's ECU chip need reprogrammed for the 4.56 ratio? (OD will drop final ratio to 3.17.)
Any mechanical bits won't be a problem. I can build, buy or farm out all that. Changing the driveshaft length is as easy as taking it to Connie's and telling them how long to make it.
I've done plenty of engine and transmission swaps on cars from the 40's to the 00's and one non-electronic 700R4 into a 1978 Chevy van, but this is my first go with stuffing a drivetrain with electronic systems into a vehicle that barely has any transistors - just electronic ignition and the radio.