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#251 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Here's a pic of the diff cover, where you can see, where the level of the ATF was. Also kept the gears clean. Nothing else seems to be damaged.
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#252 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Axle Flange Drill Fixture
One of the issues that we uncovered with the Boss 338 wheels we're using is that the mounting flanges are so thick that only 5 or 6 threads are being contacted by the lug nuts. So, Car Boss went on a search to find replacement lugs that would be longer, and came up goose eggs. Seems like the only ones that he could locate where the same length as what we have. Longer replacements were sourced but the diameter was slightly larger. This would require enlarging the lug holes in the axle flange to accommodate the new larger diameter lugs. So, leave it to Car Boss to build a "Axle Flange Drill Fixture" to hold the axle secure while enlarging the holes. Here are some pics of his handy work. Continued:
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#253 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#254 |
Registered User
Join Date: Sep 2002
Location: Austin, Texas
Posts: 1,048
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Re: 72 GMC Short Step Build
Super cool as always!
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72 Cheyenne SWB C10 (daily driver) (Super fake cause I just love the glovebox emblem) 70 Camaro RS (frame-off in pieces) 70 Camaro RS (daily driver backup) 69 Custom LWB C10 (son now drives) |
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#255 |
Senior Member
![]() Join Date: Jul 2012
Location: Oblong, Illinois
Posts: 7,028
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Re: 72 GMC Short Step Build
Nice work on the template. I am being a little slow on understanding how the template will be used. Looks like the hole dimensions and location from the axle flange are being transferred to the template. Then, will the template be used on another axle flange to locate the holes for the larger diameter axle studs?
Thanks. |
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#256 | |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Quote:
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#257 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Lowering Blocks
Here's a couple of pics of the 2" lowering blocks that we installed. Surprisingly the Ubolt nuts were pretty easy to remove. A little touch of a torch and we managed to extract the bolts. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#258 |
Senior Member
![]() Join Date: Jul 2012
Location: Oblong, Illinois
Posts: 7,028
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Re: 72 GMC Short Step Build
Ok thanks, that makes sense. Good idea, he does nice work.
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#259 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
First glimpse of the Wilwoods
Car Boss mounted the caliper brackets on the rear axle and we now have the start of some new rear brakes. Look carefully and you'll see some new brake line brackets on top of the axle tubes. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#260 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,778
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Re: 72 GMC Short Step Build
great thread! your first tpi setup brought me here, then i ended up having to read through everything!
16.5mpg seems low with that tuned port setup. maybe i missed it, but what gearing do you have in the rearend? when my 1991 z28 was still L98 tpi powered, it would easily pull down 25-27mpg on the highway with a 3.23 gear and 25.7" tire.
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#261 | |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Quote:
The fuel trims have been seriously dialed in by Double E. Could probably lean out cruise fuel, but not a good idea running cats. The rear is a 3.73 and the rear tire height a shade less than 30". But probably the biggest factor holding milage back now is this thing has the aero of a brick, no wait, a brick may have better aero. lol And then theirs the rolling resistance and it weighs more than a Camaro. Would I like to break into the 20's? Yes I would, but moving from 10mpg to 16.5mpg is a big improvement in my wallet. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#262 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,778
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Re: 72 GMC Short Step Build
are you guys tuning with ebl flash or similar? i assume your using a speed density 90-92 factory ecu. i'm planning on building a new family truckster in the near future, and i was going to go ls, but after seeing the first tpi, i got nostalgic pains for a long runner sbc!
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#263 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
[QUOTE=OutlawDrifter;7241770]are you guys tuning with ebl flash or similar? i assume your using a speed density 90-92 factory ecu. i'm planning on building a new family truckster in the near future, and i was going to go ls, but after seeing the first tpi, i got nostalgic pains for a long runner sbc![/QUOTE
OD, I'll have Double E, respond to the tune. I understand the LS/SBC quandary. It probably would have been the trendy thing to do to install an LS. (which I think are great engines, I have an LS7), but we decided to move the clock up about 10 or 12 years and ask ourselves, what would GM do if they were building a new C10? So,a warmed up TPI setup, with 700R4, factory cruise, etc was the direction we choose. And, I think a TPI looks better than an LS. Different strokes. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i Last edited by Z10; 07-15-2015 at 01:53 PM. |
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#264 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,778
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Re: 72 GMC Short Step Build
agreed on both statements. the tpi has a better torque curve through the bottom and mid-range also!
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#265 |
Registered User
Join Date: Sep 2006
Location: Riverton KS
Posts: 832
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Re: 72 GMC Short Step Build
Such a nice truck, and getting better! Im watching to see how your wilwood kits goes on. Is it the "Pro 1" kit from Travis? Im ordering that kit and a wilwood MC/ prop valve combo from them as soon as I make up my mind between red or black calipers. Have you had a chance to look through the kit to see if it looks like there will be anything else needed to finish the job?
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1970 SWB Build |
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#266 | |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Quote:
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#267 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Custom Wheel Spacers
After I mounted the Boss 338 wheels and new tires, I started getting a small amount of rubbing on the inner wheel well. So, without consulting Car Boss, I decided that a thin wheel spacer would fix the problem. So off to eBay I go and secure some generic Chinese wheel spacers. If you've been following this build you know that this was a mistake and Car Boss was not going to have it. So, while I was away on business this week, he took care of it. Now I have some very nice custom made spacers that no one will ever see. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#268 |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#269 |
Senior Member
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Location: Cedar Park, Texas
Posts: 7,500
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Re: 72 GMC Short Step Build
I bought a vintage air kit here on the forum that was from someone else's "stillborn" project. It did not include hoses and vintage air tells me the kit is obsolete, so I will have to make up my own hoses. Do you still have the hoses that came with your kit? I am using the compressor that came with the kit (sanden, I believe).
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#270 | |
Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: 72 GMC Short Step Build
Quote:
Sorry, I don't have the hoses or the Sanden compressor, sold it already. ![]()
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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#271 | |
Registered User
Join Date: Nov 2013
Location: Midland, Texas
Posts: 203
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Re: 72 GMC Short Step Build
Quote:
On my truck he wrote custom code to allow the ECM to control my Gear Vendors overdrive unit as well as the diesel glow plugs we are using for intake manifold heat. The ECM we are using on Z10's truck is indeed a speed density unit. I think it is a 7730. Car Boss
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"In an insane world a sane man must appear insane" ~Spock~ |
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#272 | |
Registered User
Join Date: Nov 2013
Location: Midland, Texas
Posts: 203
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Re: 72 GMC Short Step Build
Quote:
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"In an insane world a sane man must appear insane" ~Spock~ |
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#273 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,778
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Re: 72 GMC Short Step Build
Car Boss, thanks for sharing! I appreciate it.
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1999 GMC Suburban K2500 SLT, 454/4L80E 1991 Z/28, 6.0L/T56 1949 GMC 250, S10 Frame, 6.0L/4L80E Instagram @aceshighspeedshop |
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#274 | |
Senior Member
![]() Join Date: Jul 2012
Location: Oblong, Illinois
Posts: 7,028
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Re: 72 GMC Short Step Build
Quote:
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#275 |
Still Learning
Join Date: Jul 2009
Location: Central Oklahoma
Posts: 10,108
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Re: 72 GMC Short Step Build
I like this Car boss fellow...
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