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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #1 (Edited)
http://ruggedrocksoffroad.com/blog/2...-locker-guide/


4.10 and 4.56 Ratio Superior Gears, Parts, Install, Review.


Superior gears, install kits, and pinion yokes available from: Rugged Rocks, and 4x4parts.com
- some parts may be required from nissan.


4.10 Ratio Setup (recommended for: automatic transmission w/35" tires, manual transmission with 33" tires for increased offroad/towing performance)

Parts:

- 4.10 ratio Superior Gears for M226 (rear diff) (Superior # D44411-E_b)
- Nissan M226 (D44) Major Gear Install Kit - Nissan Xterra 2005+ (Superior # 35-3038_b)
or - Nissan M226 (D44) Minor Gear Install Kit - Nissan Xterra 2005+ by Superior (Superior # 25-3038_b)
??? - M226 (D44) Differential 24 Spline Yoke by NISSAN (nissan part # 38210-8S10A)
??? - rear pinion yoke (companion flange assembly): ? spline, ? bolt. (nissan part # )
- optional: rear axles seals x 2 (nissan part # ?)

- 4.10 ratio Superior Gears for M205 (front diff) (Superior # N205410)
- Front M205 Major Gear Install Kit - Nissan Titan by Superior (Superior # 35-3038F)
or - M205 Front Differential Minor Install Kit - Nissan Titan by Superior (Superior # 25-3038F)
- also requires: front pinion yoke (companion flange assembly): ? spline, ? bolt. (nissan part # ?)
??? - M205 Front Differential 29 Spline, 4 bolt Yoke by Superior (Superior # M20529yoke)
- recommended: pinion seal (nissan part # ?), axle seals x 2 (nissan part # ?)
- recommended: if you are using the old style (2006 and previous) M205 Titan front diff upgrade the c-clips x 2 (nissan part # ?)



4.56 Ratio Setup (recommended for manual transmission w/35" tires)

Parts:

- 4.56 ratio Superior Gears for M226 (rear diff) (Superior # D44456NT-L_b)
- Nissan M226 (D44) Major Gear Install Kit - Nissan Xterra 2005+ (Superior # 35-3038_b)
or - Nissan M226 (D44) Minor Gear Install Kit - Nissan Xterra 2005+ by Superior (Superior # 25-3038_b)
- M226 (D44) Differential 24 Spline, 4 bolt Yoke by NISSAN (nissan part # 38210-8S10A)
* check your pinion yoke for the # of bolts, rear diffs with a cv joint will have a six bolt pattern (unknown what the pinion yoke is that will directly replace this).
- optional: rear axles seals x 2 (nissan part # ?)

- 4.56 ratio Superior Gears for M205 (front diff) (Superior # N205456)
- Front M205 Major Gear Install Kit - Nissan Titan by Superior (Superior # 35-3038F)
or - M205 Front Differential Minor Install Kit - Nissan Titan by Superior (Superior # 25-3038F)
- M205 Front Differential 29 Spline, 4 bolt Yoke by Superior (Superior # M20529yoke)
or - front pinion yoke (companion flange assembly): 29 spline, 4 bolt. (nissan part # 38210-85110 flange assy-comp) i have confirmed this yoke works, it fits the pinion gear and has been connected to the oem front drive shaft.
- recommended: pinion seal (nissan part # ?), axle seals x 2 (nissan part # ?)
- recommended: if you are using the old style (2006 and previous) M205 Titan front diff upgrade the c-clips x 2 (nissan part # ?)


updates to come.
 

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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #2 (Edited)
i am compiling this info., parts lists, etc. for the people thinking of re-gearing in the future. Hopefully the process will go smoother each time someone else re-gears.

xterraPA, and others who are re-gearing please chime in.

anyone who has the 4.10 gears please let us know what the spline counts are on the pinions, bolt patterns, and the pinion yoke p/n's thanks.

we can update the lists till we get it dialed in.
 

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Sub'd....this is a WIN!
When I finally figure out how all this regearing/TS goodness works and what I need to do to keep my rig legal her in Vancouver, I'll be pulling the trigger and this info will be very helpful...thanks for getting this started :)
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I'd say the 4.10s would also be good for MT with 33s.

Final drive would be about 5% lower than stock. Better for off road. Not better if you do a lot of high speed highway driving.
 

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I'd say the 4.10s would also be good for MT with 33s.

Final drive would be about 5% lower than stock. Better for off road. Not better if you do a lot of high speed highway driving.
That's what I'll be running when I get everything together and installed, finally.

anyone who has the 4.10 gears please let us know what the spline counts are on the pinions, bolt patterns, and the pinion yoke p/n's thanks.
I'll update when I have my sets in-hand next week ... but what I understand from Steven is that this round of gears from Superior (both 4.10 and 4.56) are all 29 spline pinions. What that means is that if you have an older m226 or m205, you should be good to go ... those of us with newer diffs will need to order yokes to match the gears.
 

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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #9
I'd say the 4.10s would also be good for MT with 33s.

Final drive would be about 5% lower than stock. Better for off road. Not better if you do a lot of high speed highway driving.
i agree. better for off road and towing. i ran the 3.69 ratio with 33's in my manual transmission and had good on road performance, just struggled a little when towing the boat in the mountains.
 

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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #10 (Edited)
the 4.56 gears have given my truck new life. it is way more responsive and the engine is not working nearly as hard. the only drawback is the higher rpm's at high speed (over 120 km/h) and the loss of fuel economy at that speed. i can't wait to tow with these gears and get the front diff finished to see how it performs in 4wd. overall i would say that the 4.56 ratio for a manual transmission, and 35" tires is a great fit. if i drove alot of highway with no armor/weight or towing i would say the 4.10's would possibly be a better choice for highway and daily driving performance/ fuel economy, if you prefer to travel over the speed limit that is.
 

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As someone with a Manual tranny OR edition with the 3.69s, and looking in 2012 to titan swap, what would the best bet be? Re-gearing up to 4.10s or regearing the rear down to 3.36 or whatever.

Big reason for my hesitation to just say do the 4.10s is because I drive ~70 miles highway daily... opinions?
 

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I have put 500 miles on my M226 with the Superior 4.56 gears installed on a manual transmission with 35" tires and so far and I mostly pleased with the results.

The regained power and torque is amazing. I can use 6th gear again and I can have quicker, more responsive starts from a complete stop.

As noted earlier, the RPMs do rev higher at higher speeds, but at posted speeds you should get great results.

Unless I am going over the speed limit, I have not noticed a huge difference (drop) in MPGs.

I would suspect that going with a 4.10 gear ratio with 35" tires and a manual transmission would yield an increase in MPGs, but less power at the wheel.

I have been off-road or in 4LO yet, as I am waiting to install the M205 with matching 4.56 gears when the proper pinion yoke arrives.
 

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As someone with a Manual tranny OR edition with the 3.69s, and looking in 2012 to titan swap, what would the best bet be? Re-gearing up to 4.10s or regearing the rear down to 3.36 or whatever.

Big reason for my hesitation to just say do the 4.10s is because I drive ~70 miles highway daily... opinions?
Even with stock tires, 3.36s would be terrible getting under way and 6th gear would be essentially worthless with the slightest upgrade or headwind.

With 33s, your rpms drop about 6% from stock. With 4.10s and 33s your rpms would go up about 5% from stock.

For a lot of highway driving, I would stay with stock gearing. But I'd never consider tires larger than 33s with MT and stock gearing. The truck would be a total dog. ATs can get away with larger tires because of the assist from the torque converter. MT would feel like you were starting in 2nd gear.

Get used to the idea of worse highway fuel economy with your Titan swap...assuming you are going to let your wheels stick out from the fenders.
 

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As someone with a Manual tranny OR edition with the 3.69s, and looking in 2012 to titan swap, what would the best bet be? Re-gearing up to 4.10s or regearing the rear down to 3.36 or whatever.

Big reason for my hesitation to just say do the 4.10s is because I drive ~70 miles highway daily... opinions?
I know this is counter intuitive but PRG has extended R180 half shafts available with their titan swap kit which is ideal for manual guys. I myself am going this route. You just half to watch the skinny pedal, thats what seems most the R180 breaks are caused from.

Going to 4.10s you'd be at about 2500-3000 RPMs in 6th gear which would lead to a decet decrease in fuel economy. Until 3.73s become available for the M205 the extended half shafs are probably your best bet IMO. Once (if ever) 3.73s come out for the M205 you would not even need to regear the rear as 3.69 is within the 3% you can have with different gear ratios.

EDIT: I was doing my math at 75-80 MPH.
 

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With 4.10's on a 33" tire, at 75mph in 6th gear you'll be spinning around 2400RPM. That's only a couple hundred above OEM if you have a manual transmission.

2500RPM in 5th gear with 4.10's is about 60MPH.

Take that all with a grain of salt, but if you've got a stick the 4.10's are not a bad option at all. Also, BFG has come out with a 285/75R17 KM2, which is a 34" tire, so that falls right in the middle and might be a good alternative to the 33" if you have the correct suspension/wheel setup. Food for thought.
 

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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #19
Speed limit in AZ is 75mph on the freeways. I wonder how the rpms would be at that speed.
i think 75 mph is about the top speed when considering fuel economy. according to my bully dog over 75 mph starts to decrease fuel economy. but 75mph is a decent cruising speed anyways.
 

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Veteran - Deceased Member; 03/18/1975 - 08/16/2012
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Discussion Starter #20 (Edited)
As someone with a Manual tranny OR edition with the 3.69s, and looking in 2012 to titan swap, what would the best bet be? Re-gearing up to 4.10s or regearing the rear down to 3.36 or whatever.

Big reason for my hesitation to just say do the 4.10s is because I drive ~70 miles highway daily... opinions?
if you are running 33" tires stay with the stock 3.69 ratio. and the 3.36 ratio is the ratio that the automatic transmissions use, it is not an option for a manual transmission unless you are going to run the tires off a honda civic.
 
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