curtish57 Posted April 25 Share Posted April 25 Hey All, I am trying to figure some stuff out pertaining to the driveshaft and yoke for this 454/400 swap from a 350/350. Am I going to be able to use the stock driveshaft and just swap the yoke on it to fit the 400 or am I going to need to modify and shorten it because the 400 mounts further back? Also if I can use the old driveshaft where can I find a yoke that will fit? Thanks for all the help so far on this thing, you guys are awesome. Quote Link to comment Share on other sites More sharing options...
Scott S. Posted April 25 Share Posted April 25 Hey Curtis... Welcome to the club. Besides changing the transmission end yoke, you'll have to trim about 3" off the driveshaft as the th400 is about 24 1/2" long whereas the th350 is about 21 1/2"... As to finding a yoke, there's a few members here that have been hoarding parts for years. I'm pretty sure someone's got what you're looking for. Try looking in the "parts wanted/for sale" section. Best of lick, Scott. Quote Link to comment Share on other sites More sharing options...
curtish57 Posted April 25 Author Share Posted April 25 Hey Scott, thank you I appreciate the answer on this. I am guessing I will need a different UV joint as well for the yoke as the 350 is smaller than what the 400 would be? I will look in the for sale section for sure, thanks again. Quote Link to comment Share on other sites More sharing options...
Scott S. Posted April 25 Share Posted April 25 NP... Get the yoke first and measure it. I made the mistake of ordering a UV for my diff. when I switched from an 8.2" to a 12 bolt. Found out they both use the same joint AFTER it arrived. Now I've got a joint I'll probably never use. Quote Link to comment Share on other sites More sharing options...
curtish57 Posted April 26 Author Share Posted April 26 I did a little more research on the trans and it is out of a 70's truck, so I need a counterbore yoke 32 spline I believe. Also, just asking here, if the 400 sits further back and I need to get the driveshaft cut could I just buy the right yoke with a new UV joint and when I get the yoke end of the driveshaft cut and replaced with the new yoke and UV? Since the I am staying with my 12 bolt and have the pinion UV still I could reuse that whole end right? Quote Link to comment Share on other sites More sharing options...
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