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Poor MPG & loss of power after tanny rebuilt?

829 Views 1 Reply 2 Participants Last post by  regans5
Several years ago, I screwed up and brut up my transmission at 35K because I did not have enough oil in it after changing it out myself. Anyway, since I had it professionally rebuilt I notice that I just do not have the same amount of power from a stop as it use to have and the MPG have dropped. I have a 1999 2/4 250 ram Cummins which now has 75,000 miles on it and before the rebuilt transmission, empty I could get as high as 25 MPG on the hiway and 18.7 pulling a 24 foot 5th wheel using Amsoil though out the truck. Now I am lucky to get just over 20 MPG empty on the freeways and no more than 15 pulling my 5th wheel.

I have taken the truck back to the transmission shop several times and to other transmission shops and basically they tell me that this scenario sometimes happens because of the tolerances of the rebuilds sometimes are off just a little and this is what happens. I was told that I would just have to live with it and nothing could be done at the time. I am sick of poor proformance and MPG! I loved how the truck preformed before the rebuit tanny.

What can I do now?
Have a Dodge dealer look at it for $89.00 per hour? Live with it? Should I install a performance chip and hope for the best? Do these chips really help or will I just screw up the truck more? Which brand? Help please?
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It sounds to me like you were getting exceptionally good mileage before your rebuild. I would love to get 25 MPG highway too! I get about 20 in my 2001. Are you 100% sure that your performance & mpg drop were right after your tranny rebuild? After all you said it was several years ago. Could it have been a gradual decline over time. If so it could be due to other factors. Have you tried any intake/exhaust mods? As far as the chip is concerned I'm not running one but have been considering it? My fear has been warranty issues & additional strain on my auto trans. If you are really unhappy I would try one. Just drive sensibly & use the extra power in a safe manner & reap the benefits of extra mpg. I know someone running a Superchips tuner on his powerstroke & he says it makes a big difference (especially throttle response off the line) & picked up 2-3 mpg. Just from sigs, it looks like most cummins guys are running Edge products. My .02 & hope someone else w/ more experience chimes in. LOL :gr_patrio
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