MEANINGOF H.O.

LOOKING FOR A DIECEL INJECTIOR PUMP,,, WHAT DOES H.O. MEAN ABOUT THE MOTOR?????

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High Output.
The trucks will have H.O.with manual transmission, while the automatics will have a engine with lower output.
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wrote:

yup
Really, sure you don't want to rethink the above?
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The ones I have seen have been that way (From the factory, that is).
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wrote:

Mines an HO and it's an automatic.
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wrote:

You might want to look at a few more.
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On Mon, 19 Mar 2007 15:22:13 -0700, GeekBoy wrote:

the 555 and 610 are both considered H.O. and are offered with both auto and man transmissions in the DR. now in the BR/BE it was true that when the H.O. was first introduced it it was only offered with the 6 speed manual. (IRRC the 5 speed manual still was the lower output engine) this may be the trucks you are thinking of, but it hasn't been that way for some time.
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Yep - and also for the first half of the '03 model year, the 555ft.lb. HO was only available with the manual transmission, as the 48RE wasn't available then. Auto trucks of that timeframe got a 250HP/460ft.lb. SO engine and 47RE transmission. California trucks got the 235HP/460ft.lb. engine, regardless of transmission. That all cleared up with the introduction of the 50-state-legal 325HP/600ft.lb. engine in the latter half of the '04 model year. The engine was bumped to 610ft.lbs. for '05.
And just to complete the timeline, the '07 model year saw the first availability of the new 6.7L Cummins, but initially only in the new-for-'07 chassis cabs, at 310HP/610ft.lbs., with either the G56 6spd manual, or Aisin 6spd auto tranny.
Finally, the '07.5 models introduced the 6.7L engine to the regular pickups (2500/3500), with 350HP/650ft.lbs., but only with the 68RFE 6spd. automatic. 6spd manuals with the G56 transmission get a de-tuned 6.7L at 325HP/610ft.lbs.
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