2003 F-550 6.0 Gearvendors O/D

[oxman202]

Before I bash Gearvendors I would like some of yalls opinions.

I just put the Gearvendors O/D on and went on a long haul. 70 mph on cruise 11.16 mpg loaded with a gross weight of 15,600 lbs. I thought not bad since I was getting 10.5 mpg empty.

90° temp outside, EGT 820-880°, Trans 172°, Boost 7-8 PSI and Water 198-202°.

Empty was 12.75 MPG same 70 MPH cruise. Same outside temp, EGT 790-830°, Trans 169°, Boost 6-7 PSI and Water 196-198°.

This was on the 165 hp canned tune. When I fill up it is pouring out pure diesel, no foam. That way I know it's full. All calculations are done by hand.

What gives 2.25 MPG for $3250, come on there has to be a reason why I'm not getting the 14-15 MPG that I was promised.

Any suggestions PLEASE!

[zspear1]

I looked at a gear vendors and ran one in OBS f-350 4x4 with 7.3 for awhile. They are an investment that pays out over time, and they IMO allow you to really pull better in steep terrain which is what I bought mine for. I had the ZF5speed and I really needed the splits between 3-4 and 4-5 when hauling At the time I was not intersted in the mileage. it was 1998 HEHE diesel was cheap.

[oxman202]

Now I'm getting 16.71 mpg. Way better the 12.75. All I needed to do was take that headache rack off.

[zspear1]

Must have been a tall Headache rack.....Or just really heavy.

[oxman202]

Originally Posted by zspear1

Must have been a tall Headache rack.....Or just really heavy.

Check this other link that I started.

Gearvendors O/D F-550