The next step down is a 3.73. If you have a CTD this is a viable
option (I would not go lower though because it would add a lot more
strain to tranny) If it is a gas engiened truck, you will not gain
anything with the swap and will likely see performance and MPG suffer.
Also if it is a CTD it uses the same rear axle as GM has used in its
big block and Dmax powered trucks since 2001 (a 11.5 AAM) so gears are
readily availble for it
And, since it's a 4X4, you need to change the front axle ratio too. Contrary
to what SnoMan says, many CTD's came with 3.55 axles. They seem to do just
fine. Changing ring and pinion's is expensive:(
Not for many years have they offered a 3.55 and when they did the
engines had a lot lower rated output too. Some the juggler gears and
tire sizes give no thought to possible side effects on drive lines
because with taller gears and bigger tires besides the engine having
to make more torque to put same effort on ground at rear wheels, the
drive line has to route it there and carry a higher average torque
load too. If you have a CTD and never plan to pull any thing heavy
then a 3.42 or even taller could work but towing with those gears will
place a big strain on tranny.
If by many, you mean since 2003, then yes - that would be correct.
However, 3.54 has been the standard axle ratio for the Dana70/Dana80 axles
used behind the CTD as late as 2002, and since at least 1994, if not further
back (don't really have a lot of experience with the 1st gen trucks, so I
tend not to comment about them... something you should take note of).
My neighbor has a six speed 02 with 3.55 gears. He's burning cooking oil and
getting 22 MPG. Hauls a large goose neck horse trailer all over the place.
Wish I could have bought my 04 with 3.55's. Mostly I tow an open car
trailer, my truck runs away with it. When I do pull my 24' enclosed trailer
is the only time I feel 3.73's are about right. With 3.55's I could just
drop back to 5th and get by fine. I can't see any reason for 4.11 gears with
a new CTD. I've towed a 6 ton trailer with no problems starting on hills are
cruising up them.
3.54 was standard with the advent of overdrive automatics. Before that
Dodge used as high as 3.07 with the CTD. That's true whether auto or
standard transmission. My current '01 has 4.10's with GearVendors, seems an
Hello all and thanks for the info
What we have is a 2005 3500 4x4 quad cab diesel 6 speed manual with 17"
what the trouble is when at speed of 75 the RPMs are at 2.75 and red
line is at 4 would like to take this down. we have all kinds of power
even when pulling a 40 ft trailer can you guys tell what would be the
best size ring and pinion to replace with??
I'm confused a bit, too - seeing as how the redline is at 3,200RPM for a
CTD, not 4,000RPM. If he's turning 2750RPMs at 75MPH, then I'm guessing
he's got a dually, with the 235/70R17's, a G56 6-speed trans with a .79:1
top gear, and 4.10's in the axles. On my calculator, that works out to
2730RPMs (close enough).
Swapping to 3.73's will bring those RPMs down to just under 2500 (2484 to be
exact). A 3.54 will drop it another 100RPM.
Another option, which really gives the best of all worlds, and isn't that
much more than re-gearing both axles, is a Gear Vendors overdrive unit.
With this, you get an extra overdrive, which will effectively give you a
.62:1 top gear, yielding 2130RPM's at 75MPH with the current tire/axle
combination. See http://www.gearvendors.com for details.
I know well that early ones had 3.54 but they stopped using it when
they went to AAM axle in 03 (because it is not supported in the front
9.25 AAM axle either starting in 03 when they dumped the Dana .(You
should take note of this). They had to use a taller ratio back then to
because the early cummins did not like to rev much at all (dead at
around 2300 RPM or so as I recall) because I drove several 93 and 94
models on some steep long mountain passes when I was comparing trucks
Fascinating. Hey Max... did you know your engine's supposed to fall on
it's face at 2300RPM? I bet my buddy, with his '95 12V, sure would find
that statement curious - as I'm fairly certain he revs his out to
3200-3300RPM before each shift (the guy drives like a maniac, what can I
Bro, it was fantastic!! A bit more crowded than the last time I was there
but no big deal. Signed a p&s on a place and will close on it next month. It
is in flagler beach, about 15 miles north of daytona and I'd guess 3 miles
from the beach, driving. Sue was a bit hesitate but figures as a investment
all was cool. She kinda moves at a slower pace than I do (which isn't a bad
thing) but is warming to the idea. So this makes up my mind as far as
retireing next year. Hell, by then I'll have 35 years in playing with
locomotives, it's time. Anyway it is not near as much fun as it used to be.
Way too much bs. Sue on the other hand has 5 more years to go to recieve
here pension. But she is off all summer and has weeks off throughout the
year so she will float back and forth and I'll do the same until she's done
with teaching. Then we sell this house here in MA and at her suggestion look
at buying a boat. Damn I love that girl!!
Sounds like some good planning... hope all goes well for ya..
Will one of the places be paid off, or will you have payments on both?
we thought it out as best we could. I'm sure there will be a few surprise's
but ya gotta take your shot when it feels good.
The house here has been paid off and we've been getting killed by the
taxman. We decided to buy the place in Fl. with a equity line on the house
in MA. So actually the house in Fl. will be paid for and a lein on the house
in MA. Figure we can write off a piece of the equity line and a trip to Fl.
a year. Gotta sit down with the accountant and here what his thoughts are.
That's sort of our plan, too.. building the first house, that we'll move in to
as soon as it's done, with savings and equity line on the house in CA..
As soon as we move, the house in CA gets sold and the proceeds used to build the
2nd (rental) house..
Damn... the closer we get, the more questions/details pop up...
I never knew how many friggin decisions you had to make when you built a house!
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