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Old 06-08-2019, 02:55 PM   #1 (permalink)
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The K30 Sierra Classic Build

Figured Iíd start a build thread on here as I go along building and restoring this 1986 K30 crew cab. Itís got a real nice interior, power everything, cruise, tilt, and is a factory 6.2/4 speed stick combo. I bought the truck from a fella who wanted to keep the axles, so he dropped it off in my driveway, we blocked it up, and he tore out he diffs

I quickly found a 14 bolt and put a Dodge 60 I already had back under it to get it rolling. Unfortunately the dodge diff was all piled up and mangled, and wouldnít turn. So the truck could drive in a straight line only


So I borrowed the front GM 60 from a 79 crew cab parts truck I happened to be sitting on



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Old 06-08-2019, 02:59 PM   #2 (permalink)
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Put some proper tires onto the thing so it looks a lot better now. Has a lift from the previous owner, not sure how much but itís pretty tall. Big blocks in the back


While the eventual plan is to swap out the 6.2 for something just a bit more exciting, for the meantime Iíve picked up an NV4500 so I can actually drive it on the highway. The 6.2 will stay until all the body work is done



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Old 06-08-2019, 03:08 PM   #3 (permalink)
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Might be a little tricky getting the 205 and NV4500 to mate. Hopefully you can make it work with minimal driveshaft mods.
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Old 06-15-2019, 08:44 PM   #4 (permalink)
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Might be a little tricky getting the 205 and NV4500 to mate. Hopefully you can make it work with minimal driveshaft mods.

No he won't. This is a extremely common upgrade. I replaced the sm465 in my 73 k20 with a NV4500. Advance Adapters makes several NV4500 swap kits.

This is the one he needs https://www.advanceadapters.com/prod...spline-nv4500/

Or he could use this one if he converts his 10 spline case to 32 spline.
https://www.advanceadapters.com/prod...e-1979---1985/

Another upgrade he should do is convert the mechanical clutch to a hydraulic clutch.
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Old 06-16-2019, 08:36 AM   #5 (permalink)
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The 4500 will bolt to the 205 very easily if you swap the tcase input to the short 32 spline. tranny/tcase combo will be almost exactly the same as the 465/205 combo. Drivelines wont need mods if you go that route.
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Old 07-25-2019, 07:42 PM   #6 (permalink)
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Found a steal of a deal on a 96 Ram 2500, so I may do right away with the 6.2 and put it something a little more exciting from this parts truck




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Old 07-30-2019, 01:30 PM   #7 (permalink)
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sweet truck. Following your build.
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Old 07-30-2019, 02:24 PM   #8 (permalink)
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nice build. i’m just finishing up a similar setup. mine started as a ‘74 2wd crew but i put a dana 60 up front. i added a locker and disk brakes to the 14 bolt and did a 6.0LS/4L80/205 with twin sticks and 37” tires. also boxed the whole frame, cross over steering with ram assist and hydro boost brakes.

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Old 08-04-2019, 06:49 PM   #9 (permalink)
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Took it out for the first drive since putting the axles in, got some nice pictures



Also found a set of King Ranch seats at a junkyard, so those will likely find their way into the build




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Old 08-04-2019, 10:02 PM   #10 (permalink)
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Man I hope you get it a color that goes with those seats, I'm not a huge fan of that color interior they did. I feel like I'm the only person around anymore that like the 6.2 diesel enough to swap them into a project (pretty funny actually I'm swapping one into a 94 ram chassis)
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Old 08-05-2019, 08:34 AM   #11 (permalink)
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Man I hope you get it a color that goes with those seats, I'm not a huge fan of that color interior they did. I feel like I'm the only person around anymore that like the 6.2 diesel enough to swap them into a project (pretty funny actually I'm swapping one into a 94 ram chassis)


Iím not too sure on colour right now, thatís further on down the road. I was in a Harley dealership the other day and say some bikes done up in their Red Iron Denim, which is like a matte burnt orange sorta deal. Fell in love with the colour. Was gonna look into that

As for the 6.2, I donít hate them, but this will be my daily, and Iím so used to driving the 12 valves


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Old 08-05-2019, 09:55 AM   #12 (permalink)
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Yeah certainly nothing wrong with a 12valve lol. That color combo might work out with those seats and will be different from the crowd. Keep up the good work, these crew cabs are sweet fixed up with few modern comforts. My last crew cab had a 350sbc and 700r4 in it when I bought it so I swapped in a 6.2 and then nv3500 got thrown in because I stumbled on it cheap, that trans was a great pairing for a DD\light duty tow setup.

just a pity the poor 6.2's usually end up in scrap pile before they even have problems it seems. If I could save them I would but 9 times out of 10 they are so far from me the fuel to go get them out weighs their value (and my bank account).
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Old 08-08-2019, 06:38 PM   #13 (permalink)
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Cool project man, glad to see you saved that truck from going to the scrap yard. Subscribed and looking forward to updates.
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Old 08-08-2019, 06:46 PM   #14 (permalink)
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Took it out for the first drive since putting the axles in, got some nice pictures



Also found a set of King Ranch seats at a junkyard, so those will likely find their way into the build




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Interested in seeing how these fit.
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Old 08-08-2019, 08:08 PM   #15 (permalink)
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The K30 Sierra Classic Build

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Originally Posted by 350TacoZilla View Post
Yeah certainly nothing wrong with a 12valve lol. That color combo might work out with those seats and will be different from the crowd. Keep up the good work, these crew cabs are sweet fixed up with few modern comforts. My last crew cab had a 350sbc and 700r4 in it when I bought it so I swapped in a 6.2 and then nv3500 got thrown in because I stumbled on it cheap, that trans was a great pairing for a DD\light duty tow setup.

just a pity the poor 6.2's usually end up in scrap pile before they even have problems it seems. If I could save them I would but 9 times out of 10 they are so far from me the fuel to go get them out weighs their value (and my bank account).


Iíd like to pay special attention to the interior when I get there, give it some modern touches, but thatís down the road. And donít worry about the 6.2, itíll get a second life in my Ď79. Until I find a 6v53, anyhow, haha




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Old 08-10-2019, 01:55 PM   #16 (permalink)
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ah cool deal, 79 is my favorite year on the square bodies. I'm usually not a fan of chrome but for some reason the larger headlight bezel seems to fit the body lines better.

You thinking 6.2 and nv4500 in the 79? I have never driven a 6.2 with that nv4500, just SM465\TH400\700r4 and my NV3500 swap. Be interesting to see how the gearing works out with the rpm range the 6.2 has.
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Old 08-11-2019, 08:26 AM   #17 (permalink)
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ah cool deal, 79 is my favorite year on the square bodies. I'm usually not a fan of chrome but for some reason the larger headlight bezel seems to fit the body lines better.

You thinking 6.2 and nv4500 in the 79? I have never driven a 6.2 with that nv4500, just SM465\TH400\700r4 and my NV3500 swap. Be interesting to see how the gearing works out with the rpm range the 6.2 has.
I have an 84 Crew cab K30 with the 6.2 and 465. I have been looking at OD options. I think I am going to put a ranger overdrive splitter in. Giving me 8 speeds which I think will be useful climbing the mtns here in CO. Plus OD for mileage.
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Old 08-11-2019, 11:36 AM   #18 (permalink)
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Sorry for slight derail here OP. I meant the gearing more in the gear splits that the NV4500 has, the dodge crowd complains about the gear split being too far apart but then the cummins in stock form has about 1,000 rpm less range than the 6.2. I honestly went with the NV3500 because I got it dirt cheap and wanted a manual again but I ended up loving the gearing it had for a DD truck. I always wanted the NV4500 but never had the cash for one to see how it worked out.

The OD difference between the NV3500 I had and the NV4500 is .02 so I doubt anyone would notice 50rpm @70MPH but from a sm465 to NV3500 its the difference between [email protected] or [email protected]
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