201fireman Posted March 27, 2020 Share Posted March 27, 2020 How much HP will a stock SBC driveshaft handle? It looks like about a 3.5" shaft that necks down to 2.75" near the ends. Quote Link to comment Share on other sites More sharing options...
714024SPEED Posted April 2, 2020 Share Posted April 2, 2020 When it falls out you made 1 hp to much lol just kidding .with a good solid u joint I have had cars making 500+hp. Usually the u joint is the weak link. 1 Quote Link to comment Share on other sites More sharing options...
Blackhawk Posted April 2, 2020 Share Posted April 2, 2020 Typically the driveshaft is limited by RPM more than anything. With a non-overdrive transmission you usually won't have an issue, but if you have a manual transmission or newer overdrive automatic it's not a bad idea to figure out what your driveshaft RPM will be and size accordingly. Make sure you're using non-greasable U-joints, they're much stronger than crossdrilled U-joints. Quote Link to comment Share on other sites More sharing options...
201fireman Posted April 3, 2020 Author Share Posted April 3, 2020 Thanks folks. Quote Link to comment Share on other sites More sharing options...
Blackhawk Posted April 3, 2020 Share Posted April 3, 2020 I'd have to check to be sure, but I want to say I ended up with a 3.5" steel driveshaft balanced above 10,000 RPM. With how long our driveshafts are the critical speed (where it starts whipping and trying to go through the floor) is pretty low. Quote Link to comment Share on other sites More sharing options...
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