GTO-Vette hybrid - Page 2 - Pontiac GTO Forum
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post #11 of 24 (permalink) Old 01-30-2019, 10:17 AM Thread Starter
 
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No one makes a chassis for the 67 that uses C4 Corvette suspension, though you can get them for use with more modern Vette set-ups. So we had to struggle along and figure out a way to get it done!
After calling several frame places, the only one who would readily bend us tubing to our specs was Art Morrison. After tons of measuring, and talking to their engineers, I came up with bending 3 rails per side, the perimeters, the rear hump and the front kick-up. Morrison did a great job in mandrel bending the 2 x 4, 1/8" wall tubing to my specs.
I started by placing the rear humps in place. Fit the new floor and trunk floor very well, my measurements must have been right on. Before going further, we dragged in a Vette rear, and figured out ride height, half shaft angle, at rest, and relationship of the frame to the ground, and rear. My rough calculations showed the car would sit 2-3 inches too high, with things as they were. Not a lot we could do with some things, but we took a 3 way approach to remedy this.

First, we would use different bushings to bring the frame closer to the body, gain- about 1/2 to 3/4" lowering. Next, cut off the snubber on top of the Vette's batwing, would give us another full inch by mounting the real higher up towards the rails. The last inch was hard fought. Raise the rear rails 1 inch higher up. this meant cutting channels in the floor/trunk pan, and raising the area above the rear end a couple inches higher.
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post #12 of 24 (permalink) Old 01-30-2019, 10:24 AM Thread Starter
 
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We had to separate the wheel wells from the trunk floor, and then make cuts across the floor, front and rear, to add 2 inches to the height of it. Also had to modify the well to trunk hinge supports, and supports to the package tray. We also widened the wheel wells 2 inches to have enough room for the Vette sized rear tires.
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post #13 of 24 (permalink) Old 01-30-2019, 07:41 PM
 
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I'm impressed. That's great looking work.
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post #14 of 24 (permalink) Old 01-30-2019, 09:25 PM
 
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Garage
Nice work. My buddy has a beautiful 1970 Camaro split bumper RS/SS Camaro he did some mods to and added a low mileage '92 Vette LT1 & trans. He looked into installing a Vette rear end at the time as it was an inexpensive purchase 20 years ago. The fit would have required the same mods - sink the Vette rear frame section into the flooring and tie it all in. The floors on this car are cherry and he did not want to cut them up. So he tricked out the stock rear set-up to lower the car and a tubular a-arm set-up up from.
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post #15 of 24 (permalink) Old 02-05-2019, 06:31 PM Thread Starter
 
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Once we had the perimeter and rear rails set up, bolted to the floor mounts, measurements were taken so we could reassemble them in the same position, on our frame table. Well, we didn't have a frame table, so off to the local steel store, to buy 2 15 ft 'I' beams, to make one. Had some old ones around to make the cross pieces.
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post #16 of 24 (permalink) Old 02-08-2019, 10:49 AM Thread Starter
 
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Next step was running back and forth from the original GTO chassis, to the Vette rear, to the new rails, measuring, double checking, and marking off where the wheel base center was, where the Vette batwing mounting brackets go, where the trailing arm mounts go, etc., etc. I even made a jig on the original Vette chassis, locating the batwing mounts to the trailing arm mounts. That way I could weld the new brackets and they would all be in the correct relation to each other. The kick up on the rear rails had to be clearanced a bit for the batwing mounts. I will reinforce this area later.
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post #17 of 24 (permalink) Old 02-09-2019, 12:31 PM
 
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Originally Posted by chopolds View Post
Next step was running back and forth from the original GTO chassis, to the Vette rear, to the new rails, measuring, double checking, and marking off where the wheel base center was, where the Vette batwing mounting brackets go, where the trailing arm mounts go, etc., etc. I even made a jig on the original Vette chassis, locating the batwing mounts to the trailing arm mounts. That way I could weld the new brackets and they would all be in the correct relation to each other. The kick up on the rear rails had to be clearanced a bit for the batwing mounts. I will reinforce this area later.
Really nice work.
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post #18 of 24 (permalink) Old 02-21-2019, 09:37 AM Thread Starter
 
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The Vette stock crossmember was used up front, though an aftermarket tubular one is available, around 900$. Measuring one in a stock frame, I found that it mounts at an 11* angle. So I cut our frame to 11* where it mounts, and went through the whole measuring everything a thousand times to get it in the right wheel base, level to 11*, at right angles to the frame, etc.
The crossmember didn't have one plane where it was at 90* to the frame, or car's wheel base. Everything was at an angle. So a bunch of gussets had to be welded in to attach the crossmember to the rails.
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post #19 of 24 (permalink) Old 02-22-2019, 08:16 AM
 
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Some serious work. Looking good.
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post #20 of 24 (permalink) Old 02-28-2019, 06:47 PM Thread Starter
 
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Did a trial run of bolting on the suspension and getting the frame on the shop floor. Not really sitting low enough, but later we'll see with the body back on it.
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