OD

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I have a '99 with A/T. Is there any benefit when driving around town to have the OD locked out? What does everyone out there do? With the OD locked out it keeps the revs closer to 2000 which is supposed to be the "sweet spot" for the Cummins, right? Better mileage and power. Thanks for your answers in advance. . Larv

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1999 2500 QC, white, 4x4 with tow pkg, 3. 54's, Leer camper top, ventvisors, Luverne nerf bars, Husky floorliners, Mopar bug deflector, Mopar tow hooks, '98 Terry pull trlr, 50 watt halogen back up bulbs, hi beams with fog lights

 

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I leave mine wit the o/d not locked out while around town. I do lock it out when pulling moderate hills when traffic of other factors make my speed such that the A/T wants to keep shifting between high gear and overdrive.

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96, purchased used, white, auto, standard size tires

 

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I keep mine off as well until I hit the HWY. I wish it would stay off even after I turn the truck off so I dont have to keep turning it off.

Sky

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2001 QuadCab,SWB,Auto, 4X4,4" Flowmaster Exhaust, Bosch 275 Injectors... ... ...
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4-Sale 1994 4X4 cummins, Two tone blue and silver,Auto, all stock 105k very well looked after
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[Archive]

I lock the OD out in town only to reduce cruise speed, usually when speed limit is 35 or less, or on some of the hills in town. My mileage varies by about 1 mpg between city and open hwy driving. Keeping the OD locked out may prevent excessive engine cooling, but I imagine that warning of excessive idling is when the truck is parked. The light load of moving the pickup around town should be enough to keep the engine warm.
Just my 2 cents worth. #ad



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1999 Driftwood Regular Cab, 2WD, Auto.
1967 Barracuda

 

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I keep mine locked out below 50 mph. I don't like it shifting back and forth. As far as fuel usage, I can't say. I don't think there's a noticeable difference.

Steve
Y2K 3500 4X2 auto

 

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I've been thinking it might be an advantage to have the OD normally off for those who do most of their driving in town. Could this be done with an easy wiring change? With all the expertise out there, I'm sure someone could figure out how to do this.

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Tom W in Austin Tx 98 24v 2500 Quadcab, auto, 3. 54, lsd, Rhino, white/driftwood, Banks Stinger Plus, Manix grill, nerf bars , DTT's TC, valvebody, cooler, Mag-hytec pan, Pac brake.

 

[Archive]

usually just leave it alone. have noticed that when locked out it shifts quicker though.

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1999 3500 quad cab, auto aero fendor trim and running boards,
bugflector II, K&N filter, Geno's monster tip