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Which welded sub frame connector- 68 Plymouth

mrbone

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Was about to order US Car Tool floor pan sub frame connector, then remembered I saw somebody using a straight channel cut through the floor. Obviously, you make you're own channel and fit to frame and need to cut the floor pan, but is one better than the other? Easier?
I have a 68 Plymouth that will be used on the street and strip. Building a 500" high deck with automatic.

THANKS
 
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You can buy some 2" x 4" x 14 gauge rectangular tubing. And make them yourself ? I fabricated my own so they fit perfectly.
 
There are several ways to do what you want to do .
1 use 2x2 or 2x3 tubing and cut and split the floor pan to fit it into , weld a plate on the end of the tubing and drill holes in it to bolt it into the oem spring box , be sure to add bracing at the front cross member it is thin , but with your plan for the 500 inch motor you might need more tire and you would end up cutting all this out and doing it another way .
2 had a friend that was running a 68 roadrunner with a warmed over 440 . The car started to act funny when leaving the line , hook hard then started to bounce and move around , he brought it to me and wanted to go bigger with the tire size and mini tub it , when I pulled the carpet back I found that the floor had split around both rear frames where they were welded to the floor . It was an accident waiting to happen . Used 2x3 tubing split the floor and rear frame rails and welded it in to both . Just a reminder the tubing sticking up into the floor and the carpet will not fit as before.
3 Using the US cartool stuff is the best way to go , I would use some of their other frame stiffing items also , a 500 motor will produce a LOT of torque .. again just my thoughts .
The stiffer the better , have built a lot of cars for my customers over the years , built one for myself that was so stiff that you could jack up the rear on one side of the frame and it would pick up 3 of the 4 tires off the ground . Hope this helps John
 
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when i did mine back in 77 we cut the floor and made the connectors out of 2x3 square tubing then welded the floor back to the connectors very stiff. then we cut another piece of square tubing and welded that from the connector to the main hoop of the rollbar
 
Nice job! Those 2x3 steel connectors look awesome!
I'm not a welder, not looking forward to welding upside down on the US Car Tool connectors..
 
I did 2x3 through the floor on my '65 Coronet, Really stiff. My '66 Satellite Has the same. Very stiff. If you move the springs in you are set. A 2x2 under the floor pan could also be good, with angles welded to the floor from the 2x3. Frame connectors are a big help for consistency with a big motor.
 
I should have also said the US CarTool look pretty good. Take advantage of the floor pan contours for the added stiffness, US Cartools or 2x3 through the floor pan.
 
I decided to weld upside down on the US Car Tool connectors.
Ordered from Mancini and they arrived in two days!!
Wish me luck, it's getting cold in the midwest.
 
I decided to weld upside down on the US Car Tool connectors.
Ordered from Mancini and they arrived in two days!!
Wish me luck, it's getting cold in the midwest.
Please let me know what you think of them.
 
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