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Jonboy · 08-31-2010, 08:31 AM

If you are going to go 454, I have a TH400 that would be awesome in that too. It was rebuilt about 20K ago, and I have the reciept. It is in my dually right now, but I am planning on going 4L80E pretty soon.

The engine will drop in using the existing motor mounts you have now. headers are pretty readily available, just look for BB headers for an '83. It will most likely make the truck ride about 1" lower in the front, once your springs settle. If you are going with new springs, it may not be as much. You might want to check with the place you are getting your lowering parts from to be sure, though.

08-31-2010, 08:31 AM	#20
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: 350 to 454 swap...is it worth it? If you are going to go 454, I have a TH400 that would be awesome in that too. It was rebuilt about 20K ago, and I have the reciept. It is in my dually right now, but I am planning on going 4L80E pretty soon. The engine will drop in using the existing motor mounts you have now. headers are pretty readily available, just look for BB headers for an '83. It will most likely make the truck ride about 1" lower in the front, once your springs settle. If you are going with new springs, it may not be as much. You might want to check with the place you are getting your lowering parts from to be sure, though. __________________ 1974 Jimmy- 5.3/4L80e/NP241