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Dragline24
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Fuel milage I can expect from 3406E

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Looking at buying and old Jevic truck. 1999 FLD with a 3406E Cat, 10 speed, 3.70 rears and 22.5 LP. Plan on driving this truck 60-62 mph which will put me just above 1400 rpms. Anyone have any experience with these motors that can tell me what kind of fuel milage I can expect. Will be pulling vans a reefers mostly from Iowa to Pa.

Edited by: Kevin Rutherford ( )

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Jeffrey Szarley
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The 3406E was a very reliable engine and the fuel mileage, when tuned right, can be pretty decent. I've got the exact same truck/specs except with a Detroit Series 60.

I would absolutely recommend a FASS system and Pittsburgh power balancer/damper for that 3406E. The Crankshafts weren't balanced as well as some others, and for some reason, the transfer pumps like to suck in small amounts of air. The 3406E is easy to work on. I would rather have the 3406E than an N-14 Cummins.

I've never owned one myself, but have worked on TONS of them. I cant give you exact fuel mileage numbers, and don't want to throw any guesses out there. I try to stick to facts. Any maintenance questions on that engine, please let me know.

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Kevin Halderman
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Have a 550hp 3406e 18speed. run 65-68 mph. 9 car auto hauler. new inframe and I'm getting little under 6mpg. I was getting 6.15-6.25 before inframe. ceramic coated intakes exhaust, pittsburg power mufflers, ECM is turned up and tuned. Oversized turbo. super single tires. These motors burn head gaskets 5-6 cyl. also had exhaust sleeves go through turbo , over 600k I would replace them. 750k a lot of inframes get done on these motors. Higher torque motors vs detroits. That 10 speed is the draw back to me. It might not be that bad till you get into PA. Reg setup you should get 6.5-7 if you can drive.

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David Williams
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I am currently running a 1998 W900 with a 3406E (475) & a super 10,3.70 rear ratio. I have removed the external breathers and went with a t-600 unit,fleet air filter,pittsburg mufflers,power box,air tabs,and 24.5LPsteer tires pulling vans. I am averaging 6.54 running 62-65. I might add that this is a heavy truck by itself (26500) as it has a 132" custom bunk so even with a light load I am always over 65-70,000

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Tim Hepler
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I have a 1998 3406E (550 hp) in Volvo 770 with a Super 13 speed tranny, 3.36 gears and 455/55R22.5 X-One Energy Drive Tires.

I averaged 9.2 mpg in January and 9.05 mpg in February driving 57 mph.

I highly recommend replacing the stock exhaust manifold and turbo with the Pittsburgh Power ported/polished exhaust manifold with larger turbo including blanket and exhaust wrap that picked my fuel mileage up 6/10ths with that change alone.

I also have the PP Box, PP Balancer/dampner, FASS, Walker Megaflow Muffler, Fleet Air Filter, VistaPro CAC, Airtabs, Real Wheel Covers, TST tire pressure sensors and use Mobil Synthetic lubricants in the motor (5W40), tranny and rears.

I highly recommend MicroBlue treatment on wheel bearings, tranny and rear ends to pick up between 1.7 to 2.0 mpg. Well worth the investment.

The Cat 3406E motor is a better fuel mileage motor than it is given credit for once the crappy stock exhaust design and small turbo is replaced with the PP ones.

I have 2001 379 Pete had Tranny, Both Rear Ends, and ALL wheel bearings MicroBlue at most gained 4 tenths of a mile. Lot of money for that little increase, Not even close to what they advertise you SHOULD get. And then NO warranty unless you take it back out and send it back to them and you get to pay shipping again and let your truck set for HOW LONG?

Greg Hayden,

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