'77 c10 swb lots of fab and pics (in progress) - LS1TECH



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'77 c10 swb lots of fab and pics (in progress)

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Old 10-04-2015, 10:38 PM   #1
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Default rest in peace '77 swb turbo c10

I did my first swap a couple years ago. Bone stock 120,000 mile 5.3/4l60e into my daily driver '66 lwb. it's run near flawlessly so I have avoided tearing it apart to do more wild stuff. I decided i'd grab a 73-87 swb and throw it together with some ideas I had kicking around.








this '77 gmc is what I came home with. it got it dirt cheap because the floors and rockers were totally gone.







it came with an extra (non seized) 250-six which I cobbled together and ran around town while deciding which direction to go with it.


I was in the process of buying a new house and changing jobs (while attending night school too, woof) so I had to let it chill for a while.

Last edited by truckdoug; 11-08-2016 at 10:41 PM. Reason: updated pics
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Old 10-04-2015, 10:58 PM   #2
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we finally closed on a house and while it wasnt my dream garage it beats laying in the gravel like I used to do when I was a kid. I didnt have a ton of money to throw at tools so I went cheap and I'll upgrade later when I'm done with school and making some proper dough.






ahp 200x and a cut50f. the tig needed a torch upgrade really bad. used a small ck that uses 2 series consumables, air cooled, gas lens kit made all the difference. its actually been great, very nice stable arc and the HF start is perfect. i dont auto pulse much but if i did id be bummed that it doesnt pulse very fast or very slow. the plasma is ok. certainly nothing amazing. it cut metal and doesnt take up much space.

the first thing I did was throw in floors and rockers. i wanted to just find a good cab but I couldnt find one with a clean and clear title so I gave lmc truck $220 bucks for some re-pops.





Last edited by truckdoug; 10-30-2016 at 12:09 PM. Reason: updated pics
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Old 10-04-2015, 11:25 PM   #3
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in my '66 I have a bunch of bolt on suspension goodies. you know they brands. they advertise here. I still felt it wasn't all that. Certainly better than stock, but nothing to write home about. Especially for how much money I put in it. So on this truck I wanted to try something different. here's my CV crossmember swap






Last edited by truckdoug; 10-30-2016 at 02:45 PM. Reason: updated photos
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Old 10-05-2015, 12:18 AM   #4
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I love these trucks! I'll be watching this one .
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Old 10-05-2015, 12:23 AM   #5
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Same here I have one myself a 73. I'm stuck on the frame work right now being I don't know how to weld..

Great build an u got a good start looking forward to seeing how it turns out.
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Old 10-05-2015, 01:05 AM   #6
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Very clean work man. Keep us updated
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Old 10-05-2015, 11:24 AM   #7
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Nice work so far. Subscribing
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Old 10-05-2015, 02:00 PM   #8
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looks great so far - How much did that front vic suspension set you back?
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Old 10-05-2015, 02:06 PM   #9
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And where did you pull the crown vic front end from? Order it or junkyard? Awesome work!
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Old 10-05-2015, 04:16 PM   #10
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The CV front end I got at pick n pull on the half off day. It was $80 out the door. I should have left the $25 steering rack since it's too wide for my application. anyone considering the swap I'd look for an 03 or newer grand marquis or town car. The springs are much lighter than the cop/taxi springs. Non fleet cars also have a chance at the bushings and ball joints being in good shape.
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Old 10-05-2015, 05:39 PM   #11
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After narrowing it how close is the track width to stock?
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Old 10-05-2015, 07:07 PM   #12
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pretty close i think. I'll post a pic of it with fenders later and you can kinda see.

I can get a WMS to WMS from the narrowed CV if that helps. I gave the OG '77 front sus and crossmember to my pop for his '63 so I cant measure that.

I will say that wheel choices for the 70.6mm hub bore 5x4.5 pattern are really slim. The '03 and up are like -50mm offset. Thats how I ended up with the '02 and earlier steelies. they have about a -15mm offset. A zero offset would be ideal. you have to use a 16" or larger wheel to clear the calipers. I was thinking maybe some jeep wheels with a hub centric spacer? or an adapter to 5x4.75? Not sure yet. I still have the 9" and it's 5x5.5" pattern to deal with too

Last edited by truckdoug; 10-05-2015 at 07:47 PM. Reason: clarfied which front sus I gave away
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Old 10-05-2015, 07:24 PM   #13
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I think my next couple updates will answer a bunch of questions, but by all means please ask anything if I leave something out you wanna know more about.






Many CV swappers box the frame rails and use the upper frame locator then thru bolt it. I didn't see any reason for this on this truck. It'll weigh around 1000lbs less than a CV and I certainly won't be blasting traffic medians at 50mph in pursuit of bad guys. I decided on something a bit simpler. I'd make a bracket to grab the upper coil brace and run it to the frame. Here's some simple cardboard mock-ups




Last edited by truckdoug; 10-30-2016 at 02:49 PM. Reason: updated items
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Old 10-05-2015, 07:46 PM   #14
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here's the drop



Last edited by truckdoug; 10-30-2016 at 02:50 PM. Reason: updated items
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Old 10-05-2015, 10:54 PM   #15
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so here's where I'm at. I couldnt find heim ends with 9/16-18 RH thread to fit the mustang rack. I came up with this, although I'd love some heims if I can find them. Or maybe I'll machine an adapter from 9/16-18 to something more common.





cut down and drilled out the metric CV rod end. tigged on two grade 8 nuts. huge deep bevel gave me nearly full depth penetration in one pass. not my best work, but I need to be able to push the truck around and stuff.









ebay steering shaft 1" DD to 3/4" DD to 9/16" spline. and yep those are wooden springs haha still looking for some light duty springs from a civilian model CV
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Old 10-05-2015, 11:18 PM   #16
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low angle

Last edited by truckdoug; 10-30-2016 at 02:55 PM. Reason: updated images
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Old 10-10-2015, 10:59 AM   #17
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4l80e



GMPP converter

VS racing 69mm GT45 "denmah kit"

Last edited by truckdoug; 10-30-2016 at 02:58 PM. Reason: updated images
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Old 10-11-2015, 12:10 AM   #18
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"free" 9 inch




Last edited by truckdoug; 10-30-2016 at 02:56 PM. Reason: updated images
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Old 10-11-2015, 06:30 PM   #19
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getting interesting
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Old 10-11-2015, 07:56 PM   #20
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I like it. Subscribing.
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