Tnx. That's good to know since I do have AC
Superduty axle swap
- Thread starter swald
- Start date
Any updates on this?
03wr250f
Full Access Member
For any of you guys considering
I swapped from 4.10s to 3.55s and absolutely love it.
For those curious about what the rpms/speeds are and what speeds in the various trans gears look like. Search grimm-jeeper .com/gears
Can input and compare trans tcase, tire size and gear ratios
3.73s with 35s will be about the same effective final drive as 3.55s and 33s
But you will have more rubber hitting the ground, and more drag because of it.
If planning 35s I would suggest either 3.73 or 4.10s
You can do it with 3.55s but truck has to work harder.
I swapped from 4.10s to 3.55s and absolutely love it.
For those curious about what the rpms/speeds are and what speeds in the various trans gears look like. Search grimm-jeeper .com/gears
Can input and compare trans tcase, tire size and gear ratios
3.73s with 35s will be about the same effective final drive as 3.55s and 33s
But you will have more rubber hitting the ground, and more drag because of it.
If planning 35s I would suggest either 3.73 or 4.10s
You can do it with 3.55s but truck has to work harder.
Laine D
Full Access Member
You know (I know I’m super late) but if you calculate it all out your ratios are super close because of your tire size lol.
Laine D
Full Access Member
Hated 3.55’s with 35’s, 33’s we’re way better. I haven’t driven with the super duty axles (3.73’s) but I’m excited to see the difference
Black dawg
Registered User
I just did this in the last couple months, and have not towed heavy with it, but it is so much nicer to drive. Makes much better use of the engines torque. Pretty dramatic mpg improvement as well. This is with stock height tires.
frankenwrench
overkill is under rated!
That
That was always my point. Lol. Found final ratio I was super happy with towing as well as good mpg and kinda stayed close. Kinda expensive to do micro adjustments so I just have to wait till my tires wear out. Still love the 3.73 gearing and improved breaking. Alot of people swear that the drum rears provide better breaking. I have 7 rigs here all different backgrounds and all been serviced by myself along the way at some point, and none have done as well on breaking as the sd rear end before I messed with them or after. To each their own I suppose.
Laine D
Full Access Member
Maybe the drums do provide better braking. But discs are so much nicer to work on. Plus they clear water and everything way nicer
Old Goat
Full Access Member
Are you talking about the kit add on Disk Brakes, or the Factory set up?
I have read the add on`s have a problem.
Goat
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IDIBRONCO
IDIBRONCO
I don't have a lot of experience with that style, but I'll agree. They don't seem to hold much.
frankenwrench
overkill is under rated!
Mine have been holding well the past 5 years so far even parked on incline with 30 ft gooseneck trailer. No problems so far. But as far as braking while driving the disk have been way better. Biggest issue I have had after sd swap, still have metric lug pattern in the back, and standard pattern in the front. Gotta keep 2 different spares for it. And forget rotating them. Pita
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