73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Topic started by: drag78 on November 02, 2008, 05:52:09 pm
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Hello. Has anybody moved their rear leafs inboard for tire clearance? Any premade brackets to move them closer to the frame? Thanks
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are you talking of simply a flip-kit.
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Do you plan on relocating the leafsprings over the differential-for a dropped look?
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No, he means moving the springs to the inside of the frame rails.
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Rear axle will be relocated on top of the springs. Shoebox needs all the aero help it can get. Also need to move the springs closer to the frame for tire clearance. Don't need to go inside the frame but just about 2.5 in closer to it from where they sit. thanks
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Drag, Oops! Just read your last post. I don't know of any pre-made brackets. There isn't any reason it couldn't be done. You would have to move the shocks to the inside of the frame & widen the wheelwells about 4". How wide of a tire are you wanting to put on there? Lorne
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Thanks for the replys. Tires are Goodyear 12-30-15 on 15x12 weld draglites. Need to narrow the rear end 5in on each side to position them where I need them. Also will let me go to a 14 wide tire if I need to.
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I havent really studied it very hard, but I dont see why you cant box the inside ofr you frame, and just relocate the shackles and hangers inside, of course you would need left hanger on the right side and vice versa, and move the spring perch. I am looking at something simliar for the 4 link setup I am wanting to do on my choptop. Definately would want to box as much of the frame as possible to resist chassis flex. Lorne, what size wheel and off set are you running, and s it stock width on the axle
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Drag, You won't need to move the springs for a 12" wide tire, just move the wheelwell back flush with the spring (about 1 1/2")... About 13" will go in there, it would be close if you have it low enough to get "on the bulge" of the tire at the height of the wheel lip or lower. It amounts to One rib on the floor wider than stock
(http://i163.photobucket.com/albums/t285/HAULINIT/RearWheelhouseLH.jpg)
Chop, I'm using 10" wide with a 4 1/2" backspace I believe :-\ with 28" x 11" ET Street Radials. My rear is 59" wheel flange to wheel flange, if I remember correctly.
(http://i163.photobucket.com/albums/t285/HAULINIT/oldsweekend018-2-1-1.jpg)
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Thanks Lorne, I am wanting to go as wide a tire as possible on my 76 choptop without narrowing the frame or axle ( Im a little odd) I want the prostreet look. I know I dont need the tire that wide with the 427 I will be running, but it wont be for racing. Just want the look to go with the trucks attitude. Now my other shortbed will be for racing and hopefully I can keep it within the 10.5 class guidelines. I will be shooting for 10 second et's with it.
Drag, are you wanting this for race or looks? My experience is you want the smallest tire possible to acheive traction to reduce unnecassary drag for better et's. Is this correct Lorne?
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Chop, Yes I agree with that, the tires are rotating mass sucking power. The bigger the tire, the more power is lost turning them. They are just along for the ride once you leave the starting line...unless we're talking top fuel/funny cars ect. they NEED those tires all the way down the track.
I wouldn't worry too much about the 10.5 guidelines, at 10 seconds flat, your still over 2 seconds behind what is competitive in that class (& that's now, giving them the time it will take you to build it & get it dialed in, you'll be farther behind) ;) Build it the way you want it & have fun, that's what really counts! Lorne
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Actual tread width is 12.30in with a section width of 14.50in on a 12in/4in rear spacing wheel. To get the outside of the tire in the proper position under the truck the spring will need to be moved. Will be dropping it 5+in in the rear to get the tire up in the wheel well. Would like to run a smaller tire but without much weight on the tires i think a larger tire is the way to go. Run a 10.5 tire on my 10sec 82 cutlass. Besides that I have always liked the prostreet look since the prostockers started tucking the tires under the body in the 70's. Thanks