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Thanx and thank you Moses, i want that you check this i found in the internet: http://www.prnewswire.com/news-releases/american-axle--manufacturing-introduces-new-exclusive-342-powerdenser-gear-set-designed-to-improve-fuel-economy-58631527.html What do you think about this?

This is my truck: New Stereo:

Tank you a lots!!! and sorry for make you spend your valuable time!!! and sorry my english!! i dont think tow or haul anything, i just use the truck as a car, i have not a car because i love my cummins truck, this is why i want swap my 4.10 to 3.42 ratio axles, and almost never load anything on the box. i did realized that my 9.25 case is the needed for 3.42 because i was checking in a rebuilt pics of my front end i did 1 year ago of my dodge ram 2009 model(here in Argentina), these are some pictures of the my carrier case: complete pics of the rebuilt procedure here: https://picasaweb.google.com/108872204147686154185/DodgeRamFrontDifferential925Rebuilt?authkey=Gv1sRgCLf_zqSb95L12QE Some working papers: and the explanation in this forum: http://clubdodgeram.com/Foro/viewtopic.php?f=8&t=1079 so, you can see the carrier of this 9.25 is this (#400314460) notice the number in the box http://www.drivetrainamerica.com/p-13738-40031460-dodge-aam-925-front-loaded-standard-open-differential-case-07.aspx and not this: http://www.drivetrainamerica.com/p-4132-40035046-dodge-aam-925-gm-925-ifs-gm-95-loaded-open-differential-case.aspx

Moses, i forgot an important detail, my 9.25 aam dif 2007 up already has a case #400314460 needed for 3.42 ratio http://www.drivetrainamerica.com/p-835-40045288-dodge-aam-925-front-342-oe-ring-pinion-gear-set-2007-up.aspx http://www.drivetrainamerica.com/p-13738-40031460-dodge-aam-925-front-loaded-standard-open-differential-case-07.aspx i disassembled my diff case 1 year ago and i took some picture of it and i found that case that it is using is this, so i thing thereis no issue to fit the 3.42 ratio, what do you think about this??? i need your opinion, thanks in advance!!!! ARIEL ZDANOVICZ.-

Please, read this: Good News!!! I just got an email response back from the sales account manager of American Axle & Manufacturing. I told him that a lot of us wanted a lower numerical rear axle ratio for our trucks. He told me that a 3:42 ratio will be available in early 2007 which will retrofit back to 2003 models. that i found in the last post from this forum: http://www.dieselram.com/showthread.php?t=178907&highlight=axle+ratio&page=5

Thank you for answer, i never tow or haul, i use the truck for travels only on highways, and 4.10 its too low, 140 km/h to 2.600 rpm!!! one more teeth in the pinion means 200 rpm (aproximately) less for the engine, 2.400 to 140 and 3.73 and a desirable 2250 for 140 with 3.42, so i think i get the best MPG with 3.42 and engine running happy in that rpm, anyway i keep on mind the 4 gears for the 48RE, my big question is if i can fit the 3.42 pinion and ring in the same carrier differential 11.5 rear and 9.25 front, i tell you this because chrysler introduced the 3.42 ratio in 2008 up, and my truck its a 2007 (in the usa) and referring about speedo somebody told in another forum that the speedo pickup the signal from the abs sensor of rear end, so, if the ring has the same amount of teeth and just change the amount of the pinion teeth i think the speedo will mark correctly, (41x10 for 4.10-41x11 for 3.73-41x12 for 3.42) what do you think about this???, sorry my english, its my second language, and thank you a lot for your time!!!!.-

Hello, i want to update my Ram with cummins 5.9 and 48RE and 4.10 ratio and stock michelin tyres (265/70-17) and i want to keep this tyre size, i'm a daily driver and i use the truck for travels only, i need to cruise with less rpm, i think the 3.42 ratio would be the best option, but i wanna know if that ratio can fit in the same stock 4.10 carrier diff.-