Swapping from 2.94 to 3.73 gears (4WD)

6905 Views 15 Replies 4 Participants Last post by REDRUM, May 5, 2016

SouthernLion

Discussion Starter · May 2, 2016

So I've read quite a bit on this today. Going to be going with a 6" PC lift soon. Will probably run the Toyo Open Country A/T II's in 35x12.50R20 (34.5"). I'm currently running those same tire in a 305/55R20 (33.2") flavor.

I am a 4wd and have the wimpy 2.94 gears. (I learned my lesson that the Big Tow package would have been worth the extra money at the time.) With going to 35's I have read everyone recommends going to 3.73 gears (for the most part).

I've been nosing around 4x4parts.com and want to know if these two things are what I need for the swap, and what else I will need to do for a successful swap? Thanks.

Drive Train - Ring & Pinion Sets - 3.73 Ring & Pinion - Titan

CURRENT 2018 Charcoal CC SL Midnight Edition
Interior: Weathertech Floor Mats, 5% Tint All Around, 50% Tint on Windshield
Misc: Rigid Front Grille w/ Rigid Midnight 20" Light Bar, Tinted Tail Lights, UnderCover Ultra Flex Tonneau Cover, 50 cal Stubby Antenna

SOLD 2017 Silver CC Pro4x

SOLD 2015 White CC SV 4x4
Suspension/Wheels & Tires: ProComp 6" Lift, Icon Bracket Lift Coilovers, Icon Rear Shocks, Fuel Octane 20x9 +1 offset, Toyo Open Country M/T 35's, Dirt King Heimed UCA's, PRG Ext Sway Bar End Links, CJD Racing Traction Bars
Performance: AirRaid MXP, Titanium Ceramic Coated JBA LT's, Cajun Catted Bpipes, Cajun Custom Catback, Borla XR1 40944, Uprev, 3.73 Front & Rear Gears
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Misc: Northern Tool Black Toolbox, Royalty Core Grille, 50 cal Stubby Antenna

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CVTitan05

· #2 · May 2, 2016 (Edited)

I went 4.11s because of a deal i stumbled upon that i couldn't pass up, and am super happy i didnt go with 3.73s, its well worth it IMO.

What you posted is correct, other than you will need master install kits for both front and rear. also the front and the rear gears require a specific pinion flange, so make sure you have them on your truck already, and if not you will need to purchase them as well.

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CVTitan05

· #8 · May 3, 2016

Yes you are correct, the 4wd models retain Cruies control option. The 2wd's do not.

When you purchase the gears, the page will show what pinion is required. I believe the 08+ trucks already have the correct pinion. But again, you can call and confirm over the phone, as they will be more knowledgeable about this sort of thing.

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CVTitan05

· #10 · May 3, 2016

GalaxyPro4X11 said:
Good to know about the cruise, thanks

Anytime bud. Maybe the 2wd can get theyre ECU reflashed to 4wd to get theyre cruise control back? Never tried it with my old Titan...

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CVTitan05

· #13 · May 4, 2016

REDRUM said:
better rpms/ gas?

Yes, my Rpm's are now (i think) in the sweet spot. I can pass people in overdrive with just adding a little gas, and it gains speed. Before, as soon as i touch the gas pedal a little more, it would downshift almost instantly. Ive also noticed 1.5mpg increase average over the last 8 tanks of gas (how many ive gone through since i put the gears in). Before i hovered between 9-10mpg consistently, now im right at 11-11.3 consistantly. And i havent exactly been driving it easier than before either.

All in all, i would do it again.

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CVTitan05

· #14 · May 4, 2016

And from what im reading on 4x4parts.com website, the 3.73 rear ring and pinion requires the 24 spline:

Description

3.73 Ring & Pinion for D44 rear axle.
New gears allow for more torque, more accurate speedometer readings and proper engine rpm after installation of new tire size.
Installation kit is recommended and sold separately. Kit includes carrier bearings, inner and outer pinion bearings, crush sleeves, pinion seal and shims. If you have a 29 spline pinion we recommend that you purchase the 24 spline flange.

The front it doesnt say, it just says select the appropriate spline count, and then gives you the option of both in the "Options" section:

Description

3.73 Ring & Pinion for M205 Front axle.
New gears allow for more torque, more accurate speedometer readings and proper engine rpm after installation of new tire size.
Made of 8620 hardened steel.
Installation Kit is sold separately.
Installation Kit includes
Inner Pinion Bearing
Outer Pinion Bearing
Crush Sleeve
2-Carrier Bearings
It is important that you count the pinion flange splines. Select Appropriate Spline Count Above

But then when you check the 4.11 front ring and pinion, it says to purchase the 29 spline flange, which in my opinion, would be the same for the 3.73 gears, as they are all made by the same manufacturer:

Description

4.1 Ring & Pinion for M205 Front axle.
New gears allow for more torque, more accurate speedometer readings and proper engine rpm after installation of new tire size.
Made of 8620 hardened steel.
Installation Kit is sold separately.
Installation Kit includes
Inner Pinion Bearing
Outer Pinion Bearing
Crush Sleeve
2-Carrier Bearings
It is important that you count the pinion flange splines. If your Titan has a 24 spline flange, you will need to purchase the optional 29 spline flange.

Now what spline flange you have on the front/rear will take some more research, but nothing is more accurate than going out there and counting it yourself.

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