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Rear Truck Chassis Opinions, box or X brace #958518
03/25/11 03:04 PM
03/25/11 03:04 PM
Joined: Apr 2007
Posts: 193
MD
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ADakotaRTGuy Offline OP
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ADakotaRTGuy  Offline OP
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Looking to stiffen up the frame a little on my truck with the new motor going in. Looking to put down about 700rwhp so not sure how far I need to take the Chassis. I already have an 8 point roll bar in it that will get me to 10.00, which is about where I want to be, should be able to hit 9's pretty easily. As for the Chassis, it is boxed from the factory all the way to the end of the cab then it goes to C channel. So should I have a couple of Chromoly X braces put in or have the frame boxed in. I attached a couple pictures of what is in there now. The stock brace that was over the stock tank will be taken out when I go ahead and do the rest.



This is an older picture, but shows the brace that is going to get cut out well.


Re: Rear Truck Chassis Opinions, box or X brace [Re: ADakotaRTGuy] #958519
03/25/11 03:15 PM
03/25/11 03:15 PM
Joined: Oct 2003
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Crizila Offline
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Crizila  Offline
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Nice work. I'd X it.


Fastest 300
Re: Rear Truck Chassis Opinions, box or X brace [Re: Crizila] #958520
03/25/11 03:19 PM
03/25/11 03:19 PM
Joined: Apr 2007
Posts: 193
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ADakotaRTGuy Offline OP
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ADakotaRTGuy  Offline OP
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Wish I could take credit, but my wallet is the only one that did anything on that.

Re: Rear Truck Chassis Opinions, box or X brace [Re: ADakotaRTGuy] #958521
03/25/11 08:03 PM
03/25/11 08:03 PM
Joined: May 2006
Posts: 1,260
New Mexico
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Adobedude Offline
pro stock
Adobedude  Offline
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New Mexico
X3 on the X brace...

Do a search, Lenny has some great pics.

Here's one:
http://i407.photobucket.com/albums/pp160/8secDart/dakotas075.jpg

Here's the thread:

https://board.moparts.org/ubbthreads/showflat.php?Number=5699139

Last edited by Adobedude; 03/25/11 08:05 PM.

2001 Dodge Dakota
408 All Motor
11.27 @ 117.83 mph
2017 NM Mopar Challenge Series Champion.
Re: Rear Truck Chassis Opinions, box or X brace [Re: Adobedude] #958522
03/26/11 01:24 PM
03/26/11 01:24 PM
Joined: Mar 2005
Posts: 2,489
Pacifica, CA
Devilbrad Offline
top fuel
Devilbrad  Offline
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Pacifica, CA
X4 on the x-bracing, but make sure the frame is square, parallel, and not twisted to begin with.

Re: Rear Truck Chassis Opinions, box or X brace [Re: ADakotaRTGuy] #958523
03/26/11 02:19 PM
03/26/11 02:19 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Makes a difference which way your trying to control
movement.... if you put it as a horizontal X that will
control fore and aft(racking movement) but will do
very little for vertical movement... thats when you
need a different plane to control that force... look
at a dragster... they have a bridge network on the
side rails with a angled brace in every square to control
the rail from fore and aft racking, that whole thing
controls vertical, then they have one or two X braces
to control the two sides from racking.... the magic
work in chassis building is triangulation

Re: Rear Truck Chassis Opinions, box or X brace [Re: MR_P_BODY] #958524
03/26/11 02:21 PM
03/26/11 02:21 PM
Joined: Apr 2007
Posts: 193
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ADakotaRTGuy Offline OP
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ADakotaRTGuy  Offline OP
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Haha, So what do I want to do for drag racing?

Re: Rear Truck Chassis Opinions, box or X brace [Re: ADakotaRTGuy] #958525
03/26/11 02:30 PM
03/26/11 02:30 PM
Joined: Mar 2005
Posts: 2,489
Pacifica, CA
Devilbrad Offline
top fuel
Devilbrad  Offline
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Pacifica, CA
Quote:

Haha, So what do I want to do for drag racing?




Triangulate ever 90 degree cross member connection in a horizontal plane.

Re: Rear Truck Chassis Opinions, box or X brace [Re: Devilbrad] #958526
03/26/11 02:32 PM
03/26/11 02:32 PM
Joined: Apr 2007
Posts: 193
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ADakotaRTGuy Offline OP
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ADakotaRTGuy  Offline OP
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Ok, that makes sense. Thanks.

Re: Rear Truck Chassis Opinions, box or X brace [Re: ADakotaRTGuy] #958527
03/26/11 02:49 PM
03/26/11 02:49 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Posts: 52,972
Romeo MI
If your talking behind the axle you normally want to
control the fore and aft(racking) movement..... I have
a special issue with the car I'm building for my drag
week car... I will tow a trailer... so in my case I
need to bridge the back section(behind the diff) to
have enough vertical load carrying and also put a X
back there to control the back from side to side movement
so it doesnt buckled the quarter panels







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