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71 super · 01-29-2008, 12:45 AM

The crossmember is basically the same you will have to move it back a little further on the frame- the holes are there. You can use sb mounts but they require modification as corn stated. You will also need a frame bracket for the th400- different from th350 but the rod from column to shift pawl is the same length. You will also need a driveshaft due to length of 400. Some early 69/70 lwb trucks used low hump floors with bb so you don't need to cut the floor to make it fit, unless you just want to.

01-29-2008, 12:45 AM	#4
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: Big Block Motor Mount Question...? The crossmember is basically the same you will have to move it back a little further on the frame- the holes are there. You can use sb mounts but they require modification as corn stated. You will also need a frame bracket for the th400- different from th350 but the rod from column to shift pawl is the same length. You will also need a driveshaft due to length of 400. Some early 69/70 lwb trucks used low hump floors with bb so you don't need to cut the floor to make it fit, unless you just want to.