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Old 06-18-2022, 11:34 PM   #101
Nick_R_23
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Thanks! It’s been a real busy summer, and finally found some time to get back to it!

Finished up the last bit of wiring and cable routing, securing the O2 sensor lead, clutch bleed line, and speedo cable.



Sourced a cleaner and straighter bumper for the rear!



Drivelines are being brought into town for either a rebuild or replacement.



The biggest part, updated the tune to include PWM fan control logic! Anyone care to critique my setup? I watched projectgatago’s video, and set it up the best way I could think, seeing as I don’t have a speed sensor on this truck. My thought process is that the fan should be off at 195F (thermostat temp) and running progressively faster at speeds above 200F, and ramping up significantly above 220F. I did RPM based instead of speed, one, because I don’t have a speed sensor, two, because the fan should remain off while moving anyway due to airflow over the radiator, and three, it acts as a safeguard to kick the fan on regardless of speed or engine running if the temp is that excessive. I haven’t tested this out with the engine running yet, as I wanted some feedback in case I screwed up.



I used Holley’s default Electric Fan #1 pin but repurposed it to PWM-



This box pops up when I click ‘Where Used’. Does the port have to be actively functioning (fan on), or did I screw up?



I set this to 190F just to ensure no need for the fan below that temp.

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Old 06-19-2022, 04:13 AM   #102
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

That's interesting to see. Sorry, I'm no help with it. The bumper looks good!
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Old 06-22-2022, 08:57 AM   #103
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Dont forget to tie up the knock sensor wiring. I failed to secure mine and it rubbed through on some metal (Im guessing the fuel rails) and was shorting out popping the 40amp fuse for the ecu.
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Old 07-30-2022, 11:41 PM   #104
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Got into the suspension a bit since it’s been raining the last few weekends. New front springs, went to 8600lb GVWR since the rear was already done long ago.



Out with the old!



In with the new!



Passenger side





All installed!



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Old 07-31-2022, 12:24 AM   #105
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Keep it up. This is one of my favorite builds to follow.
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Old 08-12-2022, 07:55 PM   #106
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Finally! Both driveshafts are finished. The rear was rebuilt, the front is nearly all new. It might actually drive!



The front axle needs to be rebuilt before any serious movement happens. It’ll be getting new ball joints, new brakes, new axle seals, and new wheel bearings. I scored this OTC axle socket kit for $50 on FB!



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Old 08-12-2022, 07:56 PM   #107
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Glad to see some more progress!
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Old 08-13-2022, 07:18 PM   #108
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Driveshafts in!



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Old 08-28-2022, 01:03 PM   #109
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Down to buttoning up a lot of the little things now.

Installed the hood back on, and aligned!



The glove box door was broken off at the hinge, so its getting a new one.



New part in!



Utilizing one of the cutouts for the Holley USB cable.





And with the final touch of the original Owners Manual, its done!



Installed the floor mounted high beam switch.



Ran the wires for the speakers and dome light.



Mounting the new rear speakers in their housings.





Left and right rear speakers installed!



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Old 10-10-2022, 04:15 PM   #110
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Getting even closer here!

New front bumper brackets showed up from LMC. Very good fit and quality!



Picked up some stainless carriage bolts and hardware and mounted the bumper.



The hood is looking pretty ratty with the rusted out front section, but we’re going to make it look slightly better in the meantime before I replace it.



Desecrating some old valve covers.



One side in!



Also ordered a front axle seal install tool. For $31, it wasn’t worth screwing around without it.

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Old 10-17-2022, 12:49 AM   #111
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

I totally forgot about these heat shields. Cleaned them up and bought some stainless hardware to install them!







Getting very close to being done under the hood!



I picked up a different rear bumper in chrome instead of painted. Also installed stainless hardware on the mounts. Ordered new license plate lights as this takes a different style.



The shop is currently a disaster, but the truck is coming together!

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Old 10-17-2022, 08:56 AM   #112
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Engine compartment looks very "stockish"...I like it!
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Old 10-30-2022, 01:26 AM   #113
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Thanks!

Back to smaller updates! I bought some replacement license plate lights for the new rear bumper.

Old ones removed



New ones installed!

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Old 02-10-2023, 01:28 AM   #114
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

I picked up a new wiper motor because the old one quit working.



Turns out the new motor didnt solve the issue, nor did a new switch. After a day of troubleshooting, it turns out the blue wires were swapped in the new harness!



New wiper motor in and all wires where they are supposed to be!



Installed all new wiper washer lines and filled the tank!



Next up, finally rebuilding the front axle!



Hub and rotor removed



Rotor and bearings are well worn due to improper hub nut adjustments.



The calipers are showing their age also



Drivers side!



Even the spindles are damaged beyond repair from the loose bearings



U-joints are completely shot



Everything all apart!



Time for some new parts! Rotors and bearings



New calipers and pads





Removed the carrier and old axle seals, cleaned the housing.



New axle seals!





Pressing the new seals in! This tool was worth every penny



Carrier reinstalled



New spindles



New hub nut kit



New U-joints installed in the axle shafts



New ball joints installed in the knuckle



New rotor and caliper installed





Hub installed



Ball joints installed in passenger side knuckle



Knuckle installed to axle housing



Axle shaft and new spindle installed



Backing plate, rotor, and caliper installed.



Also installed the new trailer brake controller under the dash.



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Old 02-11-2023, 01:50 PM   #115
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Any concerns about the TermX being in the engine bay and it not being sealed?
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Old 02-11-2023, 06:19 PM   #116
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Nice progress buddy! Lots of work!
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Old 02-20-2023, 07:07 PM   #117
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

No concerns about the ECU in the engine bay. Holley states that its okay to mount it there, and it's not something thats going to see a lot of moisture anyway.
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Old 03-15-2023, 04:52 PM   #118
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

More new parts! I decided to ditch the original hubs because they were missing some small parts. Upgraded to the premium Warn set!









Also bought a new drag link set



And tie rod



The tires I ordered also showed up! BFGoodrich All Terrain in 305/70R16, or the closest metric equivalent to the current 33x12.50s.



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Old 03-17-2023, 08:22 PM   #119
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

A few more parts showed up also!

I ordered a Borgeson Street/Performance steering box with a modern 12.7:1 ratio, and 3 turns lock to lock. This should feel MUCH better than the old floaty box!



Also ordered a new matching rag joint.



Bought a pair of Rancho shocks for the front!



And a new dome light lens.



Started off this weekend by installing the dome light and new lens.





Removed the old steering box since it had play down at the pitman arm. I also deleted the cooler since it was leaking.



New box has metric O-ring fittings so the CPP adapters are no longer needed!



New rag joint installed on the new box!



Painted the old pitman arm and installed it along with the new box!



New drag link installed!

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Old 03-22-2023, 10:12 PM   #120
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

I need that steering box.
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Old 03-23-2023, 07:46 AM   #121
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Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Glad to see you still plugging away! I just put a new Borgeson box on my Z28. Very good product!
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