dspoon

Ok guys I need more get up and go with my truck. I was thinking of doing a gear swap from the 3.54 to eather a 3.73 or 4.10 gear. I pull a 10500lbs FW it really struggles up the mtns. Any pros & cons to a gear swap other them$$
What kind of rpm do most run at 65 mph with a 4.10?? I run a tall tire 33.50 inch I no this hurts but I like the look. Please chime in anyone that has done this swap.

dspoon

Bump please

rebal

4:10 s will def help you out but mpgs empty will suffer
we have 1 with 4:10s and it pulls our 10k Cat gen set( 110kva with 200 gal fuel) a lot easier then the 97 with 3:54 and the 97 run a #10 fuel plate the 99 has RV 275s. the 99 get 3 mpg less empty ,loaded they get about the same

dspoon

What kind of RPM are you turning at 65 mph with 4.10s

dspoon

more info ???

SIXSLUG

You are probably going to be over 2000 rpm at 65 with 4.10 and 33.5's.

There was a handy tire size/gear ratio/rpm figure outer at wwwtirerack.com

rickf

I run 2200 at 65 with my 98 dually with 4:10's

Rick

Ed ke6bnl

I run 4:10's with my 35 in tires and pull a 5th about 10,000 lbs. works great. and still go must of the time in od.

dspoon

Thanks for all the replys

dewclaw

I like my 3:73s with my 33 inch tires. I run 70 mph at 2k rpms. The only thing that would make it better is if I had a 6 speed.
I haul heavy loads over mountain passes sometimes and get good mpgs unloaded on the open highway. Not biased just found a happy balance.

DEW

daddy mopar

Good discussion guys. I have 3.54's with 305's as well. I dont tow that much but when I do my tranny and EGT suffer badly. I actually saw something for the Dana cases that allowed 3.90 ratios as well. I am unsure if it is an option for our application but definitely something i have been wanting to learn more about. Not quite 4.10, but not 3.73.

dspoon

Found this site for gearing. Just enter the numbers.
http://www.grimmjeeper.com/gears.html

Kilroy

2 or 4wd?

royta

http://dodgeram.org/tech/specs/axle/rpm_vs_mph.htm

The dodgeram.org site is loaded with excellent information and should be required reading of all CTD owners.

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