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Old 11-07-2012, 11:23 AM   #1
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Hi guys I need to rebuild the rear end of my 03. I have 9.25 12 bolt with 392 gears. Where can I get the parts and who can I get to do it. I went to summit racing and found what I need for about $900 just parts.Would like to use 355 gears for better gas mileage I have 20s for rims will it be ok to do that
Thanks

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Old 11-07-2012, 01:10 PM   #2
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Depending where you are in FL talk to FastHemiRam05, one gear swapping madman.
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Old 11-07-2012, 04:43 PM   #3
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West Palm Beach is my home town.
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Old 11-07-2012, 05:08 PM   #4
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Well he's up in Orlando area, check with HemiGTX too, he used to reside in your neck of the woods I believe. Know he had his gearing swapped, not sure where though.
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Old 11-08-2012, 03:54 PM   #5
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Quote:
Originally posted by bada44:
Hi guys I need to rebuild the rear end of my 03. I have 9.25 12 bolt with 392 gears. Where can I get the parts and who can I get to do it. I went to summit racing and found what I need for about $900 just parts.Would like to use 355 gears for better gas mileage I have 20s for rims will it be ok to do that
Thanks
I would like to point out that your gear strategy is considered by most incorrect for our Rams. Tall gears hurt both our mileage and performance. Stock factory 20's that are 33" tall run very nicely with 4:56 gear. Seems 2300-2400 rpm will give you the best of both worlds. Good luck...
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Old 11-09-2012, 04:13 AM   #6
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Quote:
Originally posted by Redtruck-VA:
Quote:
Originally posted by bada44:
Hi guys I need to rebuild the rear end of my 03. I have 9.25 12 bolt with 392 gears. Where can I get the parts and who can I get to do it. I went to summit racing and found what I need for about $900 just parts.Would like to use 355 gears for better gas mileage I have 20s for rims will it be ok to do that
Thanks
I would like to point out that your gear strategy is considered by most incorrect for our Rams. Tall gears hurt both our mileage and performance. Stock factory 20's that are 33" tall run very nicely with 4:56 gear. Seems 2300-2400 rpm will give you the best of both worlds. Good luck...

OK one question? When I'm on the highway at 2300-2400 that's about 80+ mph my mileage goes to 11.5 or less at 2000 rpm I'm at 70mph and mileage is 13-14 mph give or take. So how would 456s give me any better gas mileage?
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Old 11-09-2012, 05:25 AM   #7
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It might have something to do with trying to push the heavy *** brick the extra 10 mph. But actually it comes down to how hard you have to work the engine. If the engine is operated at what it see's is a lighter load it uses less gas. There is plenty of threads discussing this. There is a lot more to it then just rpm. I'm using a 4:10 gear with 28" tires and getting the best mpg ever, even with a 2800 TC which is hurting some of my town mileage. Do the research and you will better understand that the 4:56 is the way to go for most of the trucks. Besides it makes them fun to drive. Good luck...
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Old 11-09-2012, 06:26 AM   #8
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Quote:
Originally posted by Redtruck-VA:
It might have something to do with trying to push the heavy *** brick the extra 10 mph. But actually it comes down to how hard you have to work the engine. If the engine is operated at what it see's is a lighter load it uses less gas. There is plenty of threads discussing this. There is a lot more to it then just rpm. I'm using a 4:10 gear with 28" tires and getting the best mpg ever, even with a 2800 TC which is hurting some of my town mileage. Do the research and you will better understand that the 4:56 is the way to go for most of the trucks. Besides it makes them fun to drive. Good luck...

OK if I go with 456s how do I fix the speed o and the anti lock brakes idiot light.
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Old 11-09-2012, 10:50 AM   #9
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Quote:
Originally posted by bada44:
Quote:
Originally posted by Redtruck-VA:
It might have something to do with trying to push the heavy *** brick the extra 10 mph. But actually it comes down to how hard you have to work the engine. If the engine is operated at what it see's is a lighter load it uses less gas. There is plenty of threads discussing this. There is a lot more to it then just rpm. I'm using a 4:10 gear with 28" tires and getting the best mpg ever, even with a 2800 TC which is hurting some of my town mileage. Do the research and you will better understand that the 4:56 is the way to go for most of the trucks. Besides it makes them fun to drive. Good luck...

OK if I go with 456s how do I fix the speed o and the anti lock brakes idiot light.
You don't have to. The speedo and abs read the tone wheel inside the rear diff, it stays the same size no matter what gears you run.
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Old 11-09-2012, 12:16 PM   #10
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Quote:
Originally posted by Bill_L:
Quote:
Originally posted by bada44:
Quote:
Originally posted by Redtruck-VA:
It might have something to do with trying to push the heavy *** brick the extra 10 mph. But actually it comes down to how hard you have to work the engine. If the engine is operated at what it see's is a lighter load it uses less gas. There is plenty of threads discussing this. There is a lot more to it then just rpm. I'm using a 4:10 gear with 28" tires and getting the best mpg ever, even with a 2800 TC which is hurting some of my town mileage. Do the research and you will better understand that the 4:56 is the way to go for most of the trucks. Besides it makes them fun to drive. Good luck...

OK if I go with 456s how do I fix the speed o and the anti lock brakes idiot light.
You don't have to. The speedo and abs read the tone wheel inside the rear diff, it stays the same size no matter what gears you run.
Thanks for all the help I'm going to use the 410.
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