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Re: Injectors- sensors-Transmission connections
I usually work from the connectors/fuse box and run backwards towards the engine to determine what I may need to keep. Get the "pinouts" for your year engine so that you know what wires are what. I tape the ends and label them for future use.
Keep the front O2 sensors...you could ditch the rears if no cat conv. I got rid of evap wiring, egr wiring, coolant sensor at radiator, etc....
Some wires will run into the cab for tach, speedo, mil light, cruise, etc...
Better to keep and label now and then finish pulling them out later in case you need them...
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 
1972 C10 5.3L/4L60E 12bolt 5Lug - Sold
1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 
1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold
1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold
1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold)
2003 K2500HD 8.1/Allison1000/NP263
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