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Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.

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Old 11-02-2010, 12:06 PM
Dodge Ram Forum Member
Join Date: Oct 2010
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To keep my tranny happy and extend its life, i drive with O/D off anything below 55MPH or where there are lots of hills or lots of red lights. And while towing...Do not leave O/D on. Or you will regret it. I have over 176,000 miles on my stock trans and it shifts perfect. Also when i start slowing down (if above 55) i wait till i get down to 45 and turn o/d off.. Only mod ive done is the check valve delete. Also when i start up my truck i put it in Neutral to get the fluid pumping threw it and get it warm for atleast 3 mins.. Not sure how the newer trannies are designed but on the 46re the tranny pump does not run in Park..

The O/D Button is there for several reasons. Turn it off in city driving/while towing/in hilly area's/and while having to stop alot/= longer tranny life.

My O/D never see's below 55, i always put it in O/D myself once i get to 55...I hold it there at 55..Turn O/D on..Then i continue to accelerate.. Call be picky, but my tranny is still alive and well.
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Old 11-15-2010, 04:26 PM
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02haynram 02haynram is offline
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wow, these are all good question's to solve a matter I didn't realize made a big difference. I'm going to try and run with OD off cause we do mostly city driving with alot of stop&go here and see how it does on the MPG.
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Old 11-28-2010, 02:34 PM
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Default O/D issue

I recently towed a buggy across town for a friend with O/D off. Now when on the Highway (55mph+) and O/D on is causing the trans to slip and almost chip gears if this is possible. Could this be a solenoid fix? It rarely slips with O/D off.
I do not need to forget to mention the speedo does not read until i am going any speed above 20 mph. I changed a simple speed sensor and still no fix. I do not want to have to pay to rebuild the trans if something as minor as the solenoid needed to be changed instead. I do not trust any transmission shops, nor do i know anyone that works on them.

Thanks in advance! If this is the wrong place for this question, could someone please pass a link to another forum, ect. Thanks again!!
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Old 12-01-2010, 10:20 AM
qsil315 qsil315 is offline
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Originally Posted by nanney1 View Post
O.K. a couple of questions about the O/D off. At what speeds are we talking about where it would help?

I do a good bit of driving on rural roads where the speed limit is 45 mph. Would this be an application for O/D off? Ocassionally, the limit will drop to 35 and sometimes go up to 55. I don't do any stop and go city driving.

At what point is it better to run with O/D on? 55 mph, 60, 65????

Also, should you be at a complete stop to switch from O/D on to O/D off? I know it can be done on the fly, but is it harmful for the tranny to be driving with O/D off at 55 mph and switch to O/D as I approach highway cruising speeds. Or vice versa... I go from 65 mph down to a 45 mph zone and switch to O/D off.
dude all you have to do is look at your tach to answer your question. drive for a bit with od off and a bit with od on. the lower your rpms stay, the better mileage youre getting if your going the same speed. its pretty simple math bro, dont make it rocket science.
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Old 12-02-2010, 04:35 PM
nanney1 nanney1 is offline
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Maybe simple, maybe not. A couple of different things going on here.

From what I've read here, lugging the truck at low rpms with O/D on may cause lower fuel mileage than running higher rpms with O/D off at the same speed. I guess the idea of the engine being in a better power band results in better mileage for lower speeds. Seems counterintuitive, but that's what I'm reading here.

The other point that was made was that running with O/D off at lower speeds is better for the life of the tranny. Different issue than mileage.

Last edited by nanney1; 12-03-2010 at 09:04 AM.
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