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24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps

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  #1  
Old 05-20-2009, 09:30 PM
DeLuzGN's Avatar
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Default P0720, speed sensor location?

My dads truck has a P0720 code. It's '99 CTD.
It says "low output speed sensor RPM, above 15mph".

Would this be the sensor on the rear diff going south?

DeLuzGN's Sig:1999 Dodge Cummins, Q/C, 4x4, auto w/ some upgrades (previous owner did something to the trans....), FASS hpfp w/ 1/2" lines, Isspro EV fuel, pyro, boost, trans temp, Smarty, power puck, AEM Brute Force intake with Amsoil nano-fiber filter, silencer ring MIA, straight pipe, corroded black paint, homebrew biodiesel.
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Old 05-20-2009, 10:06 PM
Whit's Avatar
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Originally Posted by DeLuzGN View Post

Would this be the sensor on the rear diff going south?

yes I believe so..................cheap enough to replace to find out

Whit's Sig:"Enjoy the day. Take what you want and leave the rest...."
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Old 05-20-2009, 10:36 PM
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yeah i did mine in the middle of winter axle all frozen up it sucked
but yeah rear diff passenger side top

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2001 3500 dodge 24 v cummins, Regular cab on in Extended cab frame with a 12X8 flat bed, With Dual 5 in exhaust stacks out the bed, Gillett Diesel Stage 5 150 hp injectors, Gillett Diesel turbo stage 3, 16cfm exhaust 14cfm intake, AFE intake Stage II, Edge 5 stage chip, DD 12 button south bend clutch,#2 vp44 pump, fass fuel ddp 15 psi idle big fat 0 psi with the foot down
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Old 05-21-2009, 04:48 PM
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Great guys, thanks for the confirmation I'll toss one in there for him and see how she runs.

---AutoMerged DoublePost---

I found some more info on this code. it refers to the output speed sensor which is located on the tranny overdrive gear case and it monitors the trans output shaft rotating speed.
$30 at napa for the sensor.
hopedully that does it.

Last edited by DeLuzGN; 05-21-2009 at 04:48 PM.. Reason: Automerged Doublepost
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