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Post by superdave008 on Feb 21, 2011 22:29:59 GMT -5
 I have been doing a lot of body work on my GT2 and noticed that the doors have uneven gaps . I read about the butt sag on the bradley but didn't think it affected the GT2. I had my friend lift up on the rear of the car and it looked like it really helped the door fit situation. Is this a problem on the twoie? If it is any suggestions. I just thought the body was put together wrong and I would have to do a retrofit on the doors.  thank's Dave
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Post by centralvalleygter on Feb 21, 2011 22:50:43 GMT -5
Actually, the butt sag problem is exclusively a twoie problem. The GT 1 will have problems at the front if not supported properly, but the back end doesn't seem to be a problem.
Warmest....
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Post by Wyn on Feb 21, 2011 23:59:31 GMT -5
That gap is from the butt sag problem. The door is being distorted by the pull of the roof to the rear. If you do not have the front body and bumper mounts install it could allow the nose to drop. That Body mount bolts the two front wood supports and the clamps to the two torsion beam of the front suspension. Get the front body mounts installed before you do any adjustment for the butt sag. Get some pics on the board.   This is the drawing I used for my butt sagg brace. I also plan to use a trailer on the car so I need the extra support.      This type of brace may not work for everyone. I have the 1” body lift installed and that gives me 2.5” over the top of each shock absorber for clearance for the body. The U channel is 2” wide so that only gives ½” of clearance. If you use a brace like this on a GTE you need to change the angle of the long arms to the rear. The GTE engine compartment walls are about 8" wider at the rear. Wyn |
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Post by superdave008 on Feb 23, 2011 3:01:58 GMT -5
Hey Wynn, Thanks buddy , what a wealth of information. When I had my friend lift up on the back of the car and saw the difference in the door clearance I couldn't believe my eyes. I don't think I'lll need a frame that elaborate but your drawings were very helpful.
what size / type of engine will you be using?
thks ,
Dave
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Post by Wyn on Feb 23, 2011 7:40:21 GMT -5
I am using a 1973 type 3 engine. Don't know the hp probably 65 hp.
The fan is on the crank shaft in back instead of above the engine. That black hose that is laying on the engine is a LPG fuel line. It will connect to a LPG regulator mounted on the rear fire wall. I will use the existing throttle body from the fuel injection system with a venturi adaptor between it and the air filter. Then later on I'll switch over to hydrogen for the fuel.
Wyn
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dand
New Member
Posts: 20 
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Post by dand on Feb 23, 2011 18:19:29 GMT -5
My GT2 had the same problem. I evaluated options and determined for me that I would bolt in a 2X12 member (custom fit) with steel reinforcing members under the back bench and have that supported off the frame with heavy duty steel bolts threaded into the frame and treated support member. That got the problem resolved somewhat but not completely and then I have been glassing in the doors to be flush with the roof and all body lines - fenders and quarters. I used short strand fiber to build the thickness and then finished with more conventional fillers to final surface finish using 180 grit. Gap tolerance has been well maintained and the results look pretty good. Not quite finished but reasonably pleased so far. Plan to prime and paint this summer.
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Post by Wyn on Feb 23, 2011 18:37:36 GMT -5
Between each of the 4 mounting pads and the shock mount arm I have placed 2 heavy washers. I did that so I could replace them with shims so I could change the tension on the two arms and adjust at later time any Butt Sag that may come up.
Wyn
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Post by superdave008 on Feb 25, 2011 0:28:01 GMT -5
hey Wynn, I appreciate the drawings they make a lot of things clear. The picture also identify s the same problem i have . I want to install a roll bar and tie the rear support in to triangulate the frame like your drawing . what size tubing / frame work would you recommend, and what size framing did you use in the picture?
thank's
Dave
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Post by superdave008 on Feb 25, 2011 0:30:29 GMT -5
Wynn , ignore my last message I went back and read your entire post . got it!
Thanks
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Post by mj on Feb 25, 2011 9:51:51 GMT -5
Mine sags so much that I cannot install the torque brace across the shock towers. Where is the safest place to place a jack with the body still mounted so that I can install the brace (with 1" sealed cell aircraft foam padding over it)?
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Post by Wyn on Feb 25, 2011 22:12:50 GMT -5
MJ
On the GT-II, I would take two adjustable jack and place them under the engine compartment side walls just under the rear bumper mounting hardware.
If you have a GTE body I would place the jacks about 8" in front of the rear bumper mounting hardware, as this hardware is mounted below the partitions. These two partitions are shorter in the GTE by length and height. Make sure your rear bumper is mounted so it will help stabilize these two partitions. These two panels also do not mount to the rear of the car as they are just behind the rear taillight boxes.
Wyn
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Post by Wyn on Feb 26, 2011 15:40:42 GMT -5
superdave
The engine I am setting up is 1973 type 3 1584 c.c. rated 52 hp at 4000 rpm.
Wyn
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Post by mj on Feb 28, 2011 10:17:12 GMT -5
Thanks, Wyn. I do have the GTE body, and I modified the rear bumper mount to be stronger, so I will jack it up at the mounting points. ++ Really appreciate the help ++ superdave: FYI, my engine puts out about 165hp at the crank, but with a little work it can do 200hp. However, it has developed a horrible backfire at RPM less than 4k. I'm afraid the roller-rocker setup is wrong, or I've got a bent valve.  I'm retiring in two months and I am so weary of working on cars now that I'll probably finish the sag issue and sell it, AS-IS. |
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Post by mwilson on Mar 26, 2011 22:40:20 GMT -5
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Post by skarekr0w on Aug 29, 2013 2:59:21 GMT -5
First of all, I would like to thank everyone for making this site possible. I've only been registered less than a day, and already many of my questions have been answered. If I ever get rich and famous, I will most certainly contribute to this sites success. You people are awesome!
Now about my little disaster: I had no knowledge about butt sag until I came here, and now MANY of my questions from the slid windshield to the doors have been answered. It makes complete sense. But at this moment, it's pouring rain outside and all I can think about is the car. Is there a QUICK FIX to the butt sag issue so that my doors will at least close? Later on, I will tear it apart and fabricate a frame, but for now, I can do braces if I know which ones and where to place them. Any suggestions would be most helpful. And believe me, there's a lot more questions where this came from, but for another time. Thanks again.
You guys ROCK!
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I have been doing a lot of body work on my GT2 and noticed that the doors have uneven gaps . I read about the butt sag on the bradley but didn't think it affected the GT2. I had my friend lift up on the rear of the car and it looked like it really helped the door fit situation.
