dssur
+1y
Originally posted by TwistedMinis
Even if you stock floor it, the engine crossmember is still there and all this still applies to you.
yes and no. When I did my mazda it still had the factory control arm crossmember that hung below the frame, like the toyotas do. I didnt want to have the ghetto lean (front higher than back when laid out) so before I cut the frame off at the firewall I spaced up the rails under the cab to be level with the bottom of the front crossmember. So when I laid out the new rails, they were the 1/2 inch lower.
You can do this too. Seth is right, you still need to be aware that the front crossmember hangs lower than the frame, but if you make your new rails even with the front crtossmember you will have z'd your frame unintentionally and without any extra steps.
This helps on toyotas too because the factory frame is only something like 5 inches tall (maybe even a bit less, been a while since I had a toyota) and using new 2x3 rails set to be even with the bottom of the factory rails under the cab, you are limited to a 2 inch sfbd. But if you treat the extra inch the front crossmember hangs down as part of the frame, the factory rails are 6 inches tall (5 inches of metal, one inch of air underneath) and you can drop your bodymounts almost THREE inches instead of two.
I digress. yes, you still have to z it when you sfbd, BUT, usually it takes care of itself without an extra step. Remember that the motor and trans still move up an inch doing it this way, you will need to move the trans tunnel.