3406c mech to 3406e,c15 swap.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mr79W900A, Dec 2, 2022.

  1. Mr79W900A

    Mr79W900A Light Load Member

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    Mar 4, 2019
    British Columbia
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    Hey guys I have a 1994 t800h with a 3406c 3zj mechanical. It’s such a awesome engine but eventually I will need to do a rebuild and here’s where i need some answers. I want more power when I rebuild. This is a 425hp set at 475 but I run a dump truck and pup and am always pulling hills here in Kelowna and want more power. I am geared currently at 3:90 with a 18 spd. I am going to change gears soon to a 4:11 or 4:33 so that will definitely make a difference as well. I want a reliable rebuild and my hp goals are around 600-650. So I am wondering should I build a low compression 3zj with say the ipd steel 2 piece piston or swap in a 3406e, 6nz etc. I also have a brake saver on this truck FYI. Need some solid real world advice from those who possibly have Owned both engine types. I have only Driven a mechanical cat. Also would a 600hp mechanical pull as good power wise as a 600hp electronic engine. Or does the bigger cube electronic make that much of a difference... I’m looking to get a block next spring and slowly start building it myself and I can literally build whatever I want. Thanks for the help
     
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  3. Star Rider

    Star Rider Medium Load Member

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    Sep 23, 2019
    Michigan
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  4. HoundDog7

    HoundDog7 Light Load Member

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    Oct 7, 2022
    Kansas
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    A 3406B or C are good engines, but they don't really hold a candle to a 3406E or C15 in terms of upgrades. It all depends on what you wanna do, but power wise its alot easier and reliable to get the bigger power out of an E or C15. Most of your accessories, brackets and engine mounts will swap right over from a B/C to an E. Biggest hassle will be wiring harness obviously but even that isn't a big deal with what truck you have. Will a mechanical 3400 series at 600hp pull as good as a electronic 3400 at 600hp? Nope.
     
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