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Old 01-04-2019, 08:54 PM   #43
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,911
Re: Hatzies 2005 2500HD

Drove to Dedham and back today.
Recorded the fuel mileage on this trip with the correct tire sizes in the PCM and ABS controller and no other changes.
4.10 gears and 265/70R17 Load Range E tires at 50PSI.
223 highway miles from last fill.
15.78 gallons to fill the tank.
223 ÷ 15.78 = 14.13MPG calculated.
Instrument cluster says 12.8MPG.

This should change with the tracked MPG info...

Hatzies 2005 2500HD fuel mileage

The transmission still takes a while to slide in and out of 3rd and 4th gears. Kinda like riding the clutch. If it ain't good for a standard clutch I can't see where it would be good for an auto either. I have a tune with the tow-haul pressure table copied to the normal table along with the shorter shift times from the tow haul mode table.
If that doesn't get rid of or at least minimize that sliding feel I'll look into how I can go about shortening the TCC engagement timing without slamming it home every time it engages.
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 03-27-2019 at 01:50 PM.
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