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Alex_M's 2007 NNBS Silverado

1500 Z71 4x4
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Alex_M's 2007 NNBS Silverado

Postby Alex_M [OP] » Apr 21 2017, 5:06am

Hey all! I figured I've done enough stuff to my truck to start a genuine build thread.

I'm going to throw up some pictures real quick now, but I'll do a full list of all mods and repairs with pictures in the next couple of days. To begin, here's what I did yesterday and today. The work done was a 1" differential drop (made by yours truly) as well as a skid plate drop to retain the factory skid plate. I also installed my 1.25" BORA wheel spacers today and did a NorCal mod.

Here is the before and after of the wheel spacers to begin.

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Here is the 1" diff drop I made. I will go more in depth later, but this costed me about $11. I already had the steel and didn't want to wait on a pre-fab unit to come in, so I only had to buy the hardware.

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This picture also shows that I can still jack up the truck from the front crossmember even with the skid plate spacer installed.

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And here is the picture of my new CV angle.

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More pictures and further detail later. Night y'all.
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Re: Alex_M's 2007 NNBS Silverado

Postby ricka182ricka182 is online! » Apr 21 2017, 2:11pm

Looks good...I like that homemade drop you did... Keeps those angles nearly flat.
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Re: Alex_M's 2007 NNBS Silverado

Postby Onlyina_Chevy » Apr 21 2017, 5:15pm

Well..it's a nice idea in theory, but a diff drop is an angled block that serves two purposes. First it drops the differential where it connects to each CV axle, but the angled block twists up to the rear so that you don't create a new angle on the shaft to the transfer case. Also, they use a solid block instead of a hollow pole due to the torque from the transfer case to the differential; that hollow pole might bend or flatten if the correct conditions present themselves. For instance, if the front wheel is spinning without traction then it connects with a surface with more grip.
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Re: Alex_M's 2007 NNBS Silverado

Postby Alex_M [OP] » Apr 21 2017, 7:25pm

Thanks Rick!

Only, I don't foresee Amy of it being an issue. The diff drops I've seen are aluminum where this is steel. Also these span the entire mounting surface while the kits are just round pucks not to mention the fact that the mounts to frame have fairly soft rubber bushings to absorb most shock. These blocks are pretty stout. I don't see them folding in before the actual aluminum tabs on the diff break off.

As for the angle, its my understanding that you want to pinion angle to be the same as the transfer case angle. That way any vibrations from either u-joint cancel each other out.

Ill also add two things. One, don't try to hammer the studs out with the bracket still in the truck. They wont come out AND you'll smack your 4wd actuator and break it. Fear not, it can be super glued back together and it will work, but if it doesn't hold that's a $50 part. Ask me how I know. Luckily mine is holding. Second, use a dremel or something to shave the fins down on the diff. I didn't have electricity where I was working and I had to hand file it. Don't do that.
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Re: Alex_M's 2007 NNBS Silverado

Postby ferraiolo1 » Apr 21 2017, 7:46pm

Did you sleeve the diff drop holes?


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Re: Alex_M's 2007 NNBS Silverado

Postby project_darkphoenix_ » Apr 21 2017, 7:59pm

This ^ SLeeve those holes up or they could elongate and cause problems.

Also I would have painted that square tube before slapping it on. One day its going to rust out and you may have a diff and skid plate flopping around after you hit a bump. If you're unsure of the alloy steel you used, it could rust faster than others.
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Re: Alex_M's 2007 NNBS Silverado

Postby Alex_M [OP] » Apr 21 2017, 8:01pm

No. Not necessary because of the whole surface area being contacted by the mounting surfaces. It equalizes the pressure across the whole piece that way instead of being centered around the hole.
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Re: Alex_M's 2007 NNBS Silverado

Postby Alex_M [OP] » Apr 21 2017, 8:05pm

I definitely plan on putting some kind of coating on them. The mild steel I used likes to surface rust, but I couldn't paint them immediately because they were coated with oil and I didn't have any good solvent on hand to clean them off before painting.
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Re: Alex_M's 2007 NNBS Silverado

Postby project_darkphoenix_ » Apr 21 2017, 8:24pm

Berkebile or Brakleen does wonders for that machining oil.

Definitely look into sleeving those holes for the diff drop though
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Re: Alex_M's 2007 NNBS Silverado

Postby Alex_M [OP] » Apr 21 2017, 9:04pm

Yea, I typically use brake cleaner and then isopropyl alcohol before painting. We actually use spent motor oil in the shop since we ran out of actual machining oil and I just happened to have 25-30 gals of it in my garage. Seems to work pretty well on the drill press and the big band saw. To be honest I'm virtually the only person that uses the metalworking section at my school shop. There's a pretty nice setup there to be as small of a school as it is. I might throw up some pictures of the shop when I add more truck pictures.
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