Silverado build 3.0...or should I say 8.1

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woody90gtz
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Silverado build 3.0...or should I say 8.1

Postby woody90gtz » Sun Jun 16, 2019 10:52 am

So the wife went out to Colorado with her brother to bring her grandfather a bunch of stuff from the house he sold in NY. And I'll be damned if she didn't find me another sweet truck! haha

2001 Chevy Silverado 2500HD with the 8.1L gas engine and ZF6 manual trans. As much as I was looking forward to the build of my Cali truck...I couldn't pass up the deal for another gear and 146 extra cubes. What she really likes the suicide doors. And being over 8500GVWR, it's emissions exempt in NY so I can still do whatever I want with it!

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She says she wasn't even looking, but it popped up on her Facebook as a "you may also like". She had been looking at GMT800s while I looked at GMT400s because she had two of them in high school. I'd heard of the 496/6spd trucks...but never seen one in the wild. That ZF6 is kind of a strange pattern, but I got used to it after a day or so. R and 1 are where 1 and 2 are on my T56, and 6 is where R is. Granny 1 is about the same as my 1ton NV4500 in my truck, but it feels lower with a deeper rear gear and so much more displacement. Clutch pedal was super weird too. 2/3 of it was dead and all the friction was at the bottom. So I looked at it and removed the pivoting return spring and got rid of that 2/3. Now it sits at about the same height as the brake and is much easier to drive. Picked up a free grille from a buddy, but just started collecting some parts. I already have lots of ideas...

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Last edited by woody90gtz on Mon Oct 07, 2019 9:22 pm, edited 1 time in total.


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91 "SS" WOT 3400/5spd - 13.57@100.7 GEARHEAD dezign

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Re: Silverado build 3.0...or should I say 8.1

Postby Rettax3 » Sun Jun 16, 2019 3:51 pm

Pretty awesome. That 8.1 is a beast. I don't know how it stacks up against the 8.0 V-10 Dodge I have, but the fact that it is actually in a vehicle instead of on a stand in a garage does put you a few steps ahead right there. :lol: And the six-speed is new to me -I've never seen one and had basically written-off anything newer than the '90s trucks from GM as having anything but slush-boxes, unless slugged-down with the 4.3, so incredible find there, congrats! Impatiently waiting to hear some of your ideas. :beer:


1989 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26

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Re: Silverado build 3.0...or should I say 8.1

Postby woody90gtz » Thu Jul 11, 2019 6:35 pm

Been collecting some parts for that big bastard. Bought a set of 16" aluminum wheels to color match and wrap with Duratracs. Got an aluminum spare too. Steel doesn't hold up so well under the bed... Got a jack kit for the spare and the bumper trim piece I need for the front and another grille in case the chrome removal doesn't go well. I have a plan B!

Gonna convert to electric fans and dump the big SOB on the water pump. Ordered the trans/tcase brace for the 6spd...apparently they crack when you vibrate the drivetrain being stupid (having fun). haha. Once it's in the garage I can cut off the stock muffler and do something proper. Can't have 496 cubes whispering...

Threw together a Photoshop of the basic plan. The source photo was shitty so it could be a lot better, but it gives me the basic visual I was wondering about. It will never look as good as a GMT400, but I should be pretty happy with it when I'm done.

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91 "SS" WOT 3400/5spd - 13.57@100.7 GEARHEAD dezign

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Re: Silverado build 3.0...or should I say 8.1

Postby 3X00-Modified » Fri Jul 12, 2019 8:08 am

ZF6.... You've hug out with Shawn too much...



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Re: Silverado build 3.0...or should I say 8.1

Postby woody90gtz » Fri Jul 12, 2019 10:10 pm

Hey I created the fake "SS" long before shawn came up with "ZR6". And ZF6 is a real thing... that's the name of the trans. Way more rare than a Z71.


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Re: Silverado build 3.0...or should I say 8.1

Postby woody90gtz » Sat Aug 10, 2019 12:25 am

Been trying to sneak a little work done on the truck while the house project was going on. But I can't really sneak anything without her seeing it...not even a picture! haha
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I did get the wheels and bumper mocked up. Wheels poke out a hair more than I like, but fitment is decent. I'm gonna run 265/75/16 and not the junk 285s on there. That will help just a little. I also picked up a used hood in my color for $50. It's not great, but it's a lot better than what I had. I found about a dozen more dents in the rusty one when I got it wet... Once I buffed some of the western sun damage out of the paint (just like the Cali truck) it matched pretty well.
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I de-molded and de-stickered it and got all the adhesive off the bed rails from a cap or whatever they had on it.
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I also degreased the engine so I can find the oil leak. Unless they're just that bad at aiming the oil fill, there's gotta be a leak at the intake or valve cover...
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Also hit up ebay for some mirrors, headlights and tail lights. I hated the stock tails and the LEDs are a nice upgrade. Headlights and signals can be changed out with zero tools! It's some clips and tabs and they're in there nice and tight. Who knew GM were such geniuses since the turn of the century?
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So with everything mocked up I got a better photoshop done. This weekend I hope to have the windshield replaced, wheels dismounted, bumpers off and getting everything ready for paint.
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Re: Silverado build 3.0...or should I say 8.1

Postby Rettax3 » Sat Aug 10, 2019 6:26 pm

Looks good! I like those tail-lights, very sharp. Even the headlights look good, usually they just give the truck a pansy-ass duded-up look, but those actually have some class to them, nice job. :good:


1989 SuperCharged 3800 Srs-II (First)Six-Speed GTU
1990 Turbo 3.4 5-Speed T-Type
1990 4.0L 4-Cam 32-Valve V-8 5-Speed Indy GTi (Project)
1990 Stock(!) 3.1 MPFI Auto Indy
1995 LA1/L82 4T60E Z-26
1995 3.4 DOHC Turbo 5-Speed Z-26


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