8.1 swap w/cruise control

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1984dually

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Malin OR
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Danny
Truck Year
1984
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C30
Engine Size
8.1L
recently installed an 8.1L/4L80E into my 84 dually. Am looking into getting the cruise to work. Using a mechanical TB. Have a complete harness from an 90 suburban. Looking for ideas on what would be needed to hook it up do the TB. Steering column is from a 91. Thanks for any info
 

bucket

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Are you using a stock truck engine harness?
 

1984dually

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Danny
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1984
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C30
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Sorry for not getting back sooner. Engine/trans control harness is from Howell EFI. Chassis harness is from Painless and is the replacement harness for these trucks. Biggest problem I see is hooking the cruise linkage up to the throttle body.
 

chengny

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Couldn't find a picture of how the servo connects to the TB on an 8.1. But here are some images of the setup on smaller engines:
 

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  • X9132_1991_GMC_RVGP_Light_Duty_Truck_Service_Manual[1] 1443.jpg
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  • X9132_1991_GMC_RVGP_Light_Duty_Truck_Service_Manual[1] 1444.jpg
    X9132_1991_GMC_RVGP_Light_Duty_Truck_Service_Manual[1] 1444.jpg
    90.3 KB · Views: 86
  • X9132_1991_GMC_RVGP_Light_Duty_Truck_Service_Manual[1] 1445.jpg
    X9132_1991_GMC_RVGP_Light_Duty_Truck_Service_Manual[1] 1445.jpg
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1984dually

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Joined
Aug 31, 2013
Posts
247
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57
Location
Malin OR
First Name
Danny
Truck Year
1984
Truck Model
C30
Engine Size
8.1L
Thank for the pics, they help. Link wants me to pay. Not going to do that but thanks for the try
 

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