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1 26th October 22:49
mudbellylowery
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Posts: 1
Default 2002 F250:Changing gear ratios


My super duty 4x4 has the standard 3:73 gear from the factory.(limited slip).I
am going to change to a 4:10 on account I'm getting a much larger travel
trailer.My "traditional" thinking on the subject was that on 4x4's,you have to
change both front and rear.I was talking to a guy at work about it and he said
you don't have to change the front,but didn't know the reason why when I
questioned it.I haven't called or asked a pro anywhere,,just thought I would
see what you guys say.Thanks Mudbelly
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2 26th October 22:49
mellowed
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Posts: 1
Default 2002 F250:Changing gear ratios


You absolutely have to change the front if you ever put it into 4x4. You
can have the front and back drive wheels going at different speeds.


: My super duty 4x4 has the standard 3:73 gear from the factory.(limited
slip).I
: am going to change to a 4:10 on account I'm getting a much larger travel
: trailer.My "traditional" thinking on the subject was that on 4x4's,you
have to
: change both front and rear.I was talking to a guy at work about it and he
said
: you don't have to change the front,but didn't know the reason why when I
: questioned it.I haven't called or asked a pro anywhere,,just thought I
would
: see what you guys say.Thanks Mudbelly
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3 26th October 22:49
351cj
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Posts: 1
Default 2002 F250:Changing gear ratios


If you ever want to engage your front wheels the front gear ratio has to
match the rear end gear ratio. PERIOD.

The step from 3.73 to 4.10 is not that dramatic. The benefit between these
two gear ratios may take many many many years of trailer towing to even
coming close to off setting the cost of changing the gear sets on both
ends...

4.10's are great, (that's what I have) but I would not do what you are
suggesting.
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4 26th October 22:49
david m
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Posts: 1
Default 2002 F250:Changing gear ratios


On Thu, 04 Sep 2003 19:51:00 -0700, Mellowed rearranged some electrons to
form:

I think you mean, "you CAN'T have the front and back going at different
speeds."

--
David M (dmacchiarolo)
http://home.triad.rr.com/redsled
Linux Registered User #315744
sled351 Linux 2.4.18-14 has been up 5:30 1 user
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5 26th October 22:49
david ward
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Posts: 1
Default 2002 F250:Changing gear ratios


: match the rear end gear ratio. PERIOD.
:
: The step from 3.73 to 4.10 is not that dramatic. The benefit between these
: two gear ratios may take many many many years of trailer towing to even
: coming close to off setting the cost of changing the gear sets on both
: ends...
:
: 4.10's are great, (that's what I have) but I would not do what you are
: suggesting.
:
I was thinking the same thing. Seems to me you could save some and get
even better gear ratios with a gear splitter / underdrive. I hear they have
lockouts to keep one from splitting while in 4wd.

Dave
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6 27th October 04:27
james gillespie
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Posts: 1
Default 2002 F250:Changing gear ratios


as mentioned else where in the thread you MUST change both front and rear
ratios for the 4 wheel drive to work.

This is not an easy job. I have change ring and pinion gears and would not
want to do it again proper alignment is a must and can be tedious to
achieve. On a 2002 truck I would look long and hard for a different
solution.

Jimmy
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7 27th October 04:27
bomar
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Posts: 1
Default 2002 F250:Changing gear ratios


That guy you work with is a moron.
Slap the shit out of him.
Then never talk to him again.
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8 27th October 04:28
jeepers
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Posts: 1
Default 2002 F250:Changing gear ratios


No shit. Pop 'im once fer me too.

Hell, you gotta have the same size spare, or you'll screw up a diff or
axle or driveshaft. If'n ya have oversized tires, ya need the same
oversized spare.


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9 27th October 04:28
mellowed
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Posts: 1
Default 2002 F250:Changing gear ratios


You're right. Brain Fade or Senior moment.


: On Thu, 04 Sep 2003 19:51:00 -0700, Mellowed rearranged some electrons to : form: :
: >
: > You absolutely have to change the front if you ever put it into 4x4. You
: > can have the front and back drive wheels going at different speeds.
: >
: >
:
: I think you mean, "you CAN'T have the front and back going at different
: speeds."
:
: --
: David M (dmacchiarolo)
: http://home.triad.rr.com/redsled
: Linux Registered User #315744
: sled351 Linux 2.4.18-14 has been up 5:30 1 user
:
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10 27th October 04:32
sean conolly
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Posts: 1
Default 2002 F250:Changing gear ratios


I'll step in as a person who has actually driven a 4x4 with different gear
ratios for several years before I got the front geared to match the back.
Basically I had the back regeared for a cross country haul with a heavily
loaded trailer, and that's all I could afford to do at the time. Maybe three
years later I changed the front gears to match, but I did plenty of
off-roading in those years, so...

It is possible to use different gearsets *if you really have to* and *if
your front axle can be completly disengaged in 2WD*. This is because you
don't need the front axle unless you're in a low traction situation, and in
that situation there's not enough traction to bind up the drivetrain and
cause damage. Off road I would lock the hubs and only shift into 4wd only
when I needed it, and then back to 2wd when on firmer ground. On the road my
front axle doesn't turn at all, so it doesn't matter. However most newer
vehicles leave the front axle engaged at all times and absolutely should not
run a different ratio gearset.

So all that said, I'll also add that it was a royal pain and I was glad when
I got the chance to remedy the situation. I only did it because of my
cir***stances at the time. In your case a gear splitter sounds like a much
better alternative because it gives you the best of both worlds, a higher
ratio for towing and the stock ratio for everything else. It's also nice
because you can shift it on the fly, allowing you to select gears in-between
your stock 4-speed gears (hence the term gear-splitter). It won't cost that
much more than regearing, either.

Sean
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