Author Topic: I bit the bullet this weekend V20 burb to K5 swap  (Read 10172 times)

Offline MuddiGGEr25

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Re: I bit the bullet this weekend V20 burb to K5 swap
« Reply #30 on: April 17, 2017, 09:36:16 PM »
Well after about 18 hours of looking at those wiring diagrams, and half a dozen others, and comparing to my harness colors, i think im only gonna need 2 relays (fuel pump) and the ECU 12V supplies ECM1 & B.

I will have a 30A ATC inline waterproof fuse feeding the 12V+ going to both relays ( that should be enough right?) its only gotta feed an inline fuel pump and the ECM1 is 10A and ECMB is 10A also, and i know the fuel pump isnt more than 3.9A ( thats what the book said at the parts store)

I will just be hooking up the Temp guage and speedo at first because ive been hitching a ride to work the last 3 days due to not having a running vehicle, and they wont be at work the next 2 days.


All thats left is to mount the cross member, exhaust,  rear driveshaft, heatercore hose, vac hoses, air filter, PCM wiring, Tach, speedo, and Temp gauge and it should be usable to drive to work and run errands
1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1

1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600

1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14

Offline MuddiGGEr25

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Re: I bit the bullet this weekend V20 burb to K5 swap
« Reply #31 on: April 20, 2017, 07:19:21 PM »
Got got it going, right now the rear driveshaft is about 4" too long, gotta drop that off tomorrow at the shop to get it shortened and balanced, in the meantime its just gonna have to be a FWD truck so i can get to work.

Got up to 60MPH ok earlier, but i am using a boat fuel cell ATM, because i cannot get fuel out of the tank and i put in 5 gallons personally, so the fuel line must be broken in the tank. I am considering swapping the TBI tank into the K5, but dont know what that would entail, and whether i really feel like all that hassle.

The temporary fuel pump is woefully inadequate, but thats the point, its supposed to be a "get me home in a emergency spare" just enough to start it and get up to a decent speed.

Tomorrow im gonna just clean up my mess and try and clean up all the new oil stains on the driveway lol.

Over the weekend before work, im gonna work on installing the radio, vac gauge and tach, then get the wiring tidied up and get the fan shroud on there.


Oh yeah, manual steering for now till i get the right pump.



And holy cow is this thing LIGHT compared to the 2 burbs.

Ill get some pics up if anyone wants tomorrow
1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1

1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600

1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14