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#1 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
I installed a secondary trans cooler under the radiator. Never had an issue with overheating in general but want to be prepared for what comes next.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#2 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
One thing that has bothered me is the high ride height and stiff ride. The vette transverse spring was too low and bottomed out. I put on coil overs and QA1s best guess for me was 400 lb springs. They were also too low. Out of cash and strapped for time I ran all three springs. No more pot hole terrors. According to QA1 what I’m doing is a big no-no and the springs added together make for a race car-like 700 lb rate. I bought a pair of 200lb springs and swapped out the 400 pounders. Hard to see in the pic but it's about 1" lower. Rides softer, sits lower, no banging the pavement. Going to roll with it for a while, see what happens.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 Last edited by OKGMC4; 02-14-2018 at 05:27 PM. |
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#3 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
The springs ride much better. And the suspension settled a hair more and looks perfect. Also the handling has improved. Before when I hit a fast curve the front wouldn’t even lean, which means the tires never took a set or got any bite. The front would just slide in a massive case of understeer. Yesterday on the way home I took a certain S curve at 70mph that before was frightening at 50. One of these days I want to upgrade my C4 front brakes to C5 spec. Supposed to be a night and day braking upgrade.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#4 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: Yet another GMC build
The coil covers are definitely a big improvement. I've got an old Mr.Gasket blower/tunnel ram scoop that I think would cool set over the top section of these intakes.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#5 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
The old 2 piece Megascoop? It would look very cool turned backwards on the intake. Maybe the top half only? They don’t make those anymore so it would be pretty unique. I thought about buying 8 exhaust u bends and making a cover that looks like a tall LS1 intake but the bends are expensive and 8 of them would be over $100. I hate being so cheap. I’ve seen where some people are shaving all the ugly off the truck intakes and I have 4 of them so I may experiment.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#6 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: Yet another GMC build
It looks like this but is missing the butterflies and needs a good sanding and polishing.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#7 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Truck was wearing the tires on the outsides and I had no idea how many miles were on my vette suspension so I replaced the upper and lower ball joints as well as the tie rods and got it realigned. Drives better than ever. I think I may skip the stall converter and save it for the 69 I'm building. That truck still needs a converter and it will have more cubic inches, cam, compression, and gear to back it up. Think I may just drive this one as is and enjoy it until the other truck is finished. Still need to cover that ugly truck intake. Like the covers on my other engine but they were pretty expensive!
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#8 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
The upper door panels were getting very faded and a little stained. (Same orange cloth on the seat) I still have 2 full hides of the dark gray leather so I used a heat gun to remove the cloth and replaced it. I would like to do the seat as well but that will be a larger project.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#9 |
Registered User
Join Date: Nov 2011
Location: Middle Georgia
Posts: 296
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Re: Yet another GMC build
I like those bands of trip on the top and bottom of the door panel. Stainless? Aluminum? Is all that covering original door panels?
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#10 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Aluminum strips from Lowes cut and drilled to fit the factory holes. Original door panel taken off. Stainless would have been nice. I built these door panels from scratch. To see pics of the process see page 9. The strips actually hold the upper in place. The lower is mostly plastic trim clips like an old camaro door panel has.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 Last edited by OKGMC4; 03-16-2018 at 05:45 AM. |
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#11 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: Yet another GMC build
That cover turned out sweet! The headers sure fit nicely too!
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#12 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Had a front tire with a big bulge on the sidewall so needed new tires. You can’t buy General gmax as03 tires anymore so I got some Firehawk Indy 500s. I wanted to even the stance some and run a wider tire so I bought two more 18 inch rear vette wagon wheels and sanded and polished them. Fills the wheel well better than the 17 inch wheels did. Also pushed the fronts out 1/2 inch.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#13 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Front
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#14 |
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Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Before the lowering and bigger front wheels.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#15 |
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Join Date: Feb 2014
Location: Sunnyvale, CA
Posts: 605
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Re: Yet another GMC build
Can you tell me some about the coil covers? you make them or purchase?
Truck looks very nice.
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#16 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
They are fabricated aluminum and can be found on ebay. They come polished. Only issue is that it takes some time to trim them to fit around everything. Holley makes some that look more like big block chevy valve covers and are plastic , but still require trimming. Unless you are talking about the red engine covers. Those are made by a guy in Ohio, company is B&H Custom Designs. I have a bead roller and a punch and die but no sheet metal brake. It was easier to buy those covers than build them.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 Last edited by OKGMC4; 05-31-2018 at 09:51 PM. |
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#17 |
Senior Member
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Location: Shasta Lake, CA.
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Re: Yet another GMC build
I just read the entire build ... Great Job , looks great and you can proudly say you did it all !
That said I noticed you have the adjustable proportioning valve in the Front brake line ! This should be in the rear brake line . Remember the master cylinder front outlet is the one closest the firewall. Also the reservoirs on 4 wheel disc brakes should have equal capacity. Yours appears to be for a disc / drum system. BTW the drum side has a 10# residual valve builtin the M/C. This would cause the front disc brakes to drag on your setup. I hope this helps you.
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Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275 |
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#18 |
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Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
I'll double check but I'm pretty sure the valve is on the back brakes but I may have the lines switched front to back. The master cylinder and booster both came from a 98-02 Trans Am with 4 wheel discs. I went that route because it was cheap and I thought it should be pretty compatible with the Corvette disc brakes I'm running. Brakes have been working for 6 years with no issues. I wish my 08 Ram stopped as well!
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#19 | |
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Join Date: Oct 2009
Location: Broken Arrow, OK
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Re: Yet another GMC build
Quote:
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#20 |
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Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
It just occurred to me that 93-97 Z28 Camaros had rear disc brakes, and that the same master cylinder is specified whether it's a V6 drum car or a fully loaded V8. Maybe what I have is OK and I only need to swap the lines front to back?
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#21 | |
Senior Member
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Location: Shasta Lake, CA.
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Re: Yet another GMC build
Quote:
What you have is an adjustable proportioning valve so it just reduces the flow to the rear brakes so you can adjust when or how soon they lock up or not.
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Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275 |
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#22 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Installed the SS3200 stall converter yesterday. Now i've got a 150 mile break in period. Ordered a cam and pushrods to put in the 5.3. AND...my wife says there is absolutely positively no way I'm allowed to put my Yank sticker on MY truck. Isn't that unfair?
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#23 |
Senior Member
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Location: Shasta Lake, CA.
Posts: 1,619
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Re: Yet another GMC build
The size of the reservoir is matched to the calipers.
The Camero's single piston caliper is much smaller then the Vette's dual piston caliper. As the pads wear the fluid level drops in the reservoir to compensate for the piston (s) extending to make up for the pad wear. With the small reservoir you have you will have to keep adding fluid as the pads wear or you will loose the rear brakes and have to refill and bleed the rear system. The other problem is when its time to replace the pads, As the pistons are pushed back it will overfill the reservoir and spray fluid out of the master. To avoid this open the bleeders as you push back the piston. Of course by the time that happens you'll have forgotten all this and have fluid everywhere ![]() Probably just better to go with the correct parts ![]()
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Glen & Jane's Rides ‘57 GMC NAPCO Long Bed V8 4 speed Bought 2008 7 other cars & trucks , 5 trailers '56 Chevy Long Bed I6, 4 speed Bought 1990 Sold 8.22.2020 ’56 GMC Suburban Pickup V8, 4 speed Hydramatic Bought 1996 Sold 10.11.2020 My Other Tinkerings http://67-72chevytrucks.com/vboard/s...75#post8967275 |
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#24 |
Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
Got a shot of my truck and my father in laws 62 vette at a show today.
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56 GMC BUILD THREAD: http://67-72chevytrucks.com/vboard/s...d.php?t=368649 69 long bed Chevy turned 67 gmc jimmy roadster: https://67-72chevytrucks.com/vboard/...d.php?t=851167 |
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#25 |
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Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,226
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Re: Yet another GMC build
I’m trying to prepare for the 6.0 engine swap. I’m not sure how much power the Dana 36 rear diff can take. I’m sure the beefier Dana 44 from a 6 speed vette can take what I’ll give it.
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