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LS short box · 09-29-2021, 04:48 PM

If you go 24 tooth you only need one ecm for the engine and trans control assuming you are going to run an auto. 58 tooth requires two ecm's, one for the engine and one for the trans.
I've run booth 24 tooth engines and 58 tooth engines in hot rods. Both have worked well.

09-29-2021, 04:48 PM	#11
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,954	Re: 4.8 bored to 5.7 piston size If you go 24 tooth you only need one ecm for the engine and trans control assuming you are going to run an auto. 58 tooth requires two ecm's, one for the engine and one for the trans. I've run booth 24 tooth engines and 58 tooth engines in hot rods. Both have worked well.