2007 Yukon Denali Build (This got outta hand really quick...)

[randeez]

Noise from my rear axle was mostly wheel bearings after we ended up pulling it and checking it out. Friend just plans on swapping the bearings and running it if he ever gets his truck up and goin.

My front has a little play in the driverside output shaft at the case. There isnt much available for them, lockers were made at one point it looks like but it just transferred the weak point and ended up breaking the case. 9.25 ifs would be nice , lockers are made , but very few swaps done from what I found and all on lifted trucks, trying to package OEM height or lowered may not be possible

 

[67RS427]

This is like the perfect build and even better you are doing the tuning. Any reason you running it so rich and is that only at WOT or stoich? My wideband doesnt show anything other than stoich until mayne 3/4 throttle. Not sure if that my tuning or normal. Wondering how much mileage you gain once propeely leaned out.

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Thank you, it is definitely coming around finally and feels good to have it back on the road... As for the AFR being rich, it's a new motor with new 5" MAF & intake. Setting up the airflow values and torque scaling for this thing were not an easy process. Much rather run it rich to be safe than sorry with this much into the build. Now I know my MAF is dialed in and my wideband is giving me good readings, I can lean it out and add some timing to make some real power (as if it even needs more lol). The AFR you saw was at WOT, I believe it was 10.5 to 11.1 or so on that run. I've got a lot of room for improvement but rich is always better than lean. These motors do tend to make more power when running on the rich side. Cruising, it's commanding 13.94 and running @ 14.2 to 14.9... Could also lean that out to 15 - 15.5 for better MPG. OEM runs even leaner

Matt's Yukon is going to do the same once she's dialed in. Matt, if he hasn't done so already, should get an AXN 9.5" semi-floating rear axle like Randy did and maybe even beef up his front one. The 6L80s are handling over 700 horsepower these days too.

There's one thing about having quick numbers at the track, but the street slows things way down. For example, my '85 Buick was dialed in to run 13.77 street or track and it would kill 12-second Mustangs when street racing. Get those boys to just chirp their tires for a moment and it was all over for them.

I'm not sure what I'm going to do about the rear end yet. A 14 bolt would be a straight bolt up for the most part, might have to space out the panhard bar bc the larger cover and I've considered doing it. Honestly I was just going to throw a TrueTrac in the 10 bolt and see what happens. The rear differential is original with a G80 and 160k miles. The 14 bolt uses the 10 bolt axles anyways, so with quality bearings and a good center section, that 10 bolt will be just fine. Being AWD, 40% of that power is going to the front BW4485 transfer case (also original). You would have to be making 1,000hp + at the wheels and dead hook to blow up a properly built 10 bolt with 40% power going to the front, IMO.

I just rebuilt my front 8.25" IFS differential, unfortunately there is nothing you can do to beef them up. No one sells a posi or limited slip for them, it's an open diff. Again, you gotta be making a ton of power to break one since 1000whp, the front diff only sees 400whp of that. Transfer case will go first but we shall see... I have a chain for it and will rebuild with new bearings if needed. Front 8.25" diff usually cracks the housing before anything else. Gotta have a week point somewhere, as much as I hate to say it.

 

[randeez]

I my hit ya up for some tips with hptuners

just started playing around with it, adjusted a few little things and trying to comprehend what tuner did prior, it runs pretty good but im sure more vve/maf tuning couldnt hurt.
ive got a wb02 sitting here i need to get in before i do to much more. so far i bumped up the shift rpm another 200 and and tweaked the VVT cam timing a little bit from TSP. i think he had the wrong tables from TSP in there- it was a little lazy in the midrange.

 

[swathdiver]

Randy, did you need to space your panhard bar with that AXN axle?

 

[randeez]

Nope, everything fell right in. Swapped brakes, rotors, lines onto 9.5 axle.
I have the spoon adjustable bar but stock bar should give even more clearance, it's close though. Using stock diff cover for now may see if other cover will fit when I change fluid

 

[swathdiver]

 

[Tonyrodz]

WOW!! 11.7@116. Damn that's fast. I wonder what he's putting down at the wheels.

 

[67RS427]

I've seen that video before, your truck?

 

[swathdiver]

WOW!! 11.7@116. Damn that's fast. I wonder what he's putting down at the wheels.

If we figure a 5,900 pound race weight and he went through the traps at 116.36, that's 719 Rear Wheel Horsepower. Mighty impressive.

I'm guessing his truck weighs 5,700 fully optioned and the driver weighs 200.

I've seen that video before, your truck?

Not mine, just came across and thought you'd like to see it.

 

[67RS427]

If we figure a 5,900 pound race weight and he went through the traps at 116.36, that's 719 Rear Wheel Horsepower. Mighty impressive.

I'm guessing his truck weighs 5,700 fully optioned and the driver weighs 200.



Not mine, just came across and thought you'd like to see it.

Hard to tell but it looks like it's AWD or 4x4. I would think it would have trouble hooking if RWD but I also think a better 60ft is possible. I know my 60ft should be quicker than that. I'm looking at test/tune track days at Milan, MI right now lol... Anyone wanna rent the track? It's "only" $2,500 for 40 cars and 60 spectators. Not too bad if there's enough people. I know I could get 10 pretty fast cars together.

 

[swathdiver]

Hard to tell but it looks like it's AWD or 4x4. I would think it would have trouble hooking if RWD but I also think a better 60ft is possible. I know my 60ft should be quicker than that. I'm looking at test/tune track days at Milan, MI right now lol... Anyone wanna rent the track? It's "only" $2,500 for 40 cars and 60 spectators. Not too bad if there's enough people. I know I could get 10 pretty fast cars together.

Yeah, he had some kind of hesitation coming off the line. Maybe he soft pedaled it or had some lag or programming bug. That would be fun but I'm too far away and haven't done anything to mine other than have it tuned.

 

[about20ninj45]

Hard to tell but it looks like it's AWD or 4x4. I would think it would have trouble hooking if RWD but I also think a better 60ft is possible. I know my 60ft should be quicker than that. I'm looking at test/tune track days at Milan, MI right now lol... Anyone wanna rent the track? It's "only" $2,500 for 40 cars and 60 spectators. Not too bad if there's enough people. I know I could get 10 pretty fast cars together.

I go on Wednesday's it's only 30 bucks

 

[67RS427]

I go on Wednesday's it's only 30 bucks

I saw that DTS sponsors one every Wed... Bad day for me but I'll make it happen in the next 2 or 3 weeks for sure. I really wanna see what this thing can do before I install my interchiller

 

[itsbo1313]

Looks/sounds awesome.

 

[wendal]

And also cleaned the Denali today...

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Just out of curiosity, why no front grill? It looks great, but I'd be scared of someone being able to walk up and unlatch my hood...

 

[67RS427]

Just out of curiosity, why no front grill? It looks great, but I'd be scared of someone being able to walk up and unlatch my hood...

Been waiting until I finish my heat exchanger fan shroud and install the fans on the heat exchanger... It's really not possible for something/someone to unlatch the hood, it still needs to be pulled from inside the truck under the dash and even then there's a secondary latch center of the hood that needs to be pulled for it to actually open. Not gonna happen...

 

[67RS427]

I can't remember the last time I posted an update... Too lazy to go back and look lol. I don't think I mentioned that I blew another transmission. These 6L80 transmissions sure don't like 850-900hp thrown at them. I lost my 4-5-6 clutch pack and those gears ultimately lmao. I still drove it around in 1st, 2nd and 3rd for two weeks while I waited for some new billet hard parts.

The 4-5-6 clutch pack in this transmission is one of the biggest weak links. There is really NO clutch surface area at all in that pack so they commonly go even in stock form. I probably wasn't running enough line pressure either but it still wouldn't have lived long at all. This transmission lasted 2k miles before it went out on me. So....

I yanked the Y-pipe, Driveshafts, Transfer case & Transmission... Got everything out in record time. I think I only had 3hrs total to R&R everything. Pretty bad when you get that good at something (3rd or 4th transmission build).

Here's a few pics... I rushed to get this done and back on the road for the Woodward Dream Cruise here in Michigan. Glad I did because I had a freaking blast. Got some good races in and plenty of cruising. Finally have working A/C now! A/C was a pain in the ass using the CTS-V compressor, had to notch the frame/motor mounts and make all new custom lines to retain the rear A/C for the kids. Ready for my interchiller now.


Ready, Set, GO!

Y Pipe & Driveshafts Out:

 

[67RS427]

Transmission Out:

Circle D Makes an AMAZING Converter... Absolutely love this thing!

Not sure if I've shown off my TCI Flexplate, but it is a top notch piece as well... Wasn't the cheapest but I know it wont break with the power I'm making.

So, this is my 4-5-6 clutch pack... Those are not all steels lmao, there is supposed to be friction material on half of these. Oh well, time for some bigger, better clutches.

 

[67RS427]

So I rebuilt the transmission with some better clutches and went to a billet intermediate shaft for the 4-5-6 pack. Also decided to do the billet planetary gear set. This transmission "should" be bulletproof now as long as I don't screw it up with tuning.

Needed to keep things cool, so I added a Derale Transmission Cooler on top of my TruCool LPD and the one in the radiator.

Almost installed, one more line to run up...

New Heat Exchanger Shroud for my 6" Fans to keep IATs under control while I wait for my chiller...

 

[67RS427]

Everything was finished just in time for the Cruise. I had a blast doing AWD burnouts & launches... I swear I got more compliments in this truck than I did in my 67 Camaro. People loved it and couldn't believe how hard it launches. I was told by a GM Engineer that works on the COPO Camaro program that it was the fastest 60' car he's seen on Woodward and possibly the street period. He saw me launch this thing off the line with 9psi of boost @ 1,900 RPM and thought the front tires were gonna come off the ground. I might need to put in some adjustable shocks and strap down the front end. Track day coming soon...

Here is a few videos from yesterday and I'll add a few from before the Transmission went on me as well... Enjoy! More to come, need a better Microphone with wind reduction for this camera.

A little but of blower whine at part throttle. I can't hear this at all from inside the truck since the exhaust is so loud...

Some Freeway pulls in the Tunnels on the way to the Zoo (Kids love it lol)

I honestly think I'm running on 7 cylinders here, I'm really not happy with these Taylor wires. The #4 wire keeps coming off the plug and none of them click on like they should. I just got my new Accel Ceramic boot wires yesterday. Looking forward to seeing the difference.