Best mpg with 35s - Page 2 - Dodge Cummins Diesel Forum
98.5-02 Performance Parts Discussion Discussion of Performance Parts For the 98-02 Trucks No Advertising ...NO ADVERTISING

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post #13 of 19 (permalink) Old 01-23-2017, 08:40 PM
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In my 2002 6 speed manual i was getting around 12-13 around town on 35 inch nittos.. maybe 18-19 on the highway


2007.5 mega cab 6.7, g56 W/single disk south bend, full deletes, 5 inch MBRP, studs, 6 inch lift, 37" toyos, s&b intake, 140hp 350tq shop tune, 185k miles
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post #14 of 19 (permalink) Old 02-16-2017, 09:01 PM Thread Starter
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Maybe I'm doing alright. I'm averaging 2k rpm @ 65 with 315/75/r16

Dodge said stock was 410 gearing, dana 70, limited slip(what does this mean?)

Anything besides a tuner to improve? I do travel a steep grade daily, and it was doing over 16 on a stretch of hwy that isn't so hilly. I keep wanting to get a tuner, but the one I researched isn't even available for shipment in ca :/
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post #15 of 19 (permalink) Old 02-18-2017, 10:54 PM
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With truck in sig I net around 12-14 mpg traveling at about 80 mph 2k rpm with 3.55 gearing. Plan is to drop the lift here soon, redo the suspension to make it ride smooth again, go to either sac or vco 7.010 150 or 175hp injectors and a 62/68x12 turbo. If I have to drop tire size once removing the lift I will but trying to keep them until I have to replace them and then I will go down to a 33x12.5r20 a/t. Eventually I would love to upgrade to 3.73 gearing unless convinced otherwise.
Obviously I know if i could shake the weight in my right foot boot my mpg's would improve, however i do not think that will happen any time soon especially once the turbo and injectors are upgraded.

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post #16 of 19 (permalink) Old 02-19-2017, 12:22 AM
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Is there even an aftermarket gear available in 3.73 for our year trucks? I thought we were very limited in gear selections.

2002 RAM 2500 24V CUMMINS, AUTO. 4" MBRP TURBO BACK EXHAUST, CRAZY CARLS SUPER BHAF, DANIEL STERN HEADLIGHT RELAY HARNESS, & MOPAR OEM SPORT HEADLAMPS.
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post #17 of 19 (permalink) Old 02-19-2017, 12:54 AM
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Quote:
Originally Posted by ManualTrans View Post
Is there even an aftermarket gear available in 3.73 for our year trucks? I thought we were very limited in gear selections.
USA Standard Gear 3.73 Ring & Pinion for Dana 70 ZG D70-373

01 ecsb auto 4x4, 6" lift 325/60r20 Hankook dynapro AT. BHAF, 5" exhaust turbo back, edge jwa, GDP fuel boss, HD mild built trans w/derale deep trans pan, ford 6.0 Tcooler! MoparMan's CCV mod
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post #18 of 19 (permalink) Old 02-19-2017, 10:52 AM
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Quote:
Originally Posted by My02sixspeed View Post
In my 2002 6 speed manual i was getting around 12-13 around town on 35 inch nittos.. maybe 18-19 on the highway
First off how are you getting your odometer reading? How are you doing your math to figure this out? Anyone with oversized tires cannot use a percent offset to figure out odometer distance. This is incorrect and will create some wild numbers. The only way to be sure is to use GPS odometer then you'll have a true distance.

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post #19 of 19 (permalink) Old 02-19-2017, 03:09 PM
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wow. cool. guess I wasn't lookin hard enough.

IF one were to jump up in tire size, say to a 33/12.5/18 from the stock 265/70/16, I wonder if a gear swap to a 3.73, from the stock 3.54 would be even worth it...going to a 33 tire I THINK makes the effective gear ratio on a 3.54 actually somewhere in the low 3.40's.

However, even so, Wouldn't a 3.73 gear be ideal for our trucks regardless? Many on here who have 4.10s I've read, they favor the 3.54's, if you aint towing all day every day.

I dunno...

2002 RAM 2500 24V CUMMINS, AUTO. 4" MBRP TURBO BACK EXHAUST, CRAZY CARLS SUPER BHAF, DANIEL STERN HEADLIGHT RELAY HARNESS, & MOPAR OEM SPORT HEADLAMPS.
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