Originally Posted by hcompton
For the trans you can buy nice prebent 2x4s ready to make plates for bolting in. Do not use round tube it will not give good bolting or welding surfaces.
For front engine cradle it should be boxed up. If not already may want to replace if its not a nice heavy junk of steel. That section of the frame should be very strong.
Trans crossmember is just to hold the trans and support.
The front member is structual and very important to how well your finish project will drive and handle real world conditions.
I agree with some you posted but round tubing can be used very easy..Here's one I did using the round tubing.. And you can unbolt it if you needed too..
Here's another one I did with 1''x2'' tubing,, The very samething can be done with pipe,, As far as the front crossmember.. Boxing it is the only way to go..