Gear ratio Question
#11
Go with the 4.56 then. With the 33's, it will make around town driving easier on the truck, and towing as well. You will suffer a bit on the freeway, but, in the over all scheme of things, you will still come out ahead. AND, if you want to go to 35's in the future, you will already be geared reasonably for them. It's an expensive job, do it once, do it right, don't worry about it again.
#12
#13
#15
Since we're on the subject, how much rpm bump at 60mph if I switch from 3.55 to 3.70 or 3.92 running stock tires? I don't want bigger tires, tow only 3000lbs a few times a year, lots of freeway driving.
Truck runs between 1500 rpm to 1750 at 60mph, that's too low, like it to be little higher rpm on freeway. Currently has to downshift out of OD on mild hills at 60mph, understandable when rpm only 1750, that's not in the optimal rpm power band.
And what are the different options for correcting the speedo? I have SCT so electronic correction isn't an option.
EDIT: Found the the answer to the speedo adjustment question.
https://dodgeforum.com/forum/2nd-gen...edo-reset.html
Speedo change not affected by gear ratio change in 98 and newer trucks. Tire diameter change however does require parameters to be changed using a DRBIII tool, or dealership can do this.
Truck runs between 1500 rpm to 1750 at 60mph, that's too low, like it to be little higher rpm on freeway. Currently has to downshift out of OD on mild hills at 60mph, understandable when rpm only 1750, that's not in the optimal rpm power band.
And what are the different options for correcting the speedo? I have SCT so electronic correction isn't an option.
EDIT: Found the the answer to the speedo adjustment question.
https://dodgeforum.com/forum/2nd-gen...edo-reset.html
Speedo change not affected by gear ratio change in 98 and newer trucks. Tire diameter change however does require parameters to be changed using a DRBIII tool, or dealership can do this.
Last edited by beeker; 03-08-2013 at 09:51 PM.
#16
#17
EDIT: Think this rpm bump from 3.55 to 4.10 would be closer to 400rpm increase, might go with 3.92 gears, that would be about 250 increase.
Last edited by beeker; 03-08-2013 at 09:54 PM.
#18
Quick question on this topic, but are 4.10's or 4.56's better for 305/75/16=34's pretty much. Because when I do my lift I'm thinking between 285's, 295's, or 305's and just wanted to know what gear would be better for all those tires. I myself think 4.10's will suffice since I'm not wanting to go over 35's( I know the 305's are really close tho) I rarely tow or haul anything with my truck, maybe in the future a atv or some random stuff here and there but that's it.
Last edited by Blue Mopar01; 03-06-2013 at 10:35 PM.
#19
Unless you already have 4.10s from factory, you might as well just put 4.56s in there since its already going to be torn apart anyway. Shoot I think it's pretty much the same cost for the gear sets...you won't regret going to the 4.56s. Buttttt if you already have 4.10s and don't do any regular hauling or towing, then you should be ok to go to 305 tires without it hurting the drivetrain, assuming everything is functioning properly
#20