Installation Time
(approx) a Day
Difficulty Level:
Mechanical expertise or professional installation required.
FREE 1 to 3-Day Delivery on Orders $149+ Details
Ford Performance Ring and Pinion Gear Kit; 3.55 Gear Ratio (10-14 Mustang GT)Find parts that fit my vehicle
Item 50166G11
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features
- Ford Racing Quality
- Strong Forged Construction
- 3.55 Gear Ratio
- 8.8" Ring Gear Diameter
- For Street or Track Use
- Fits 2010-2014 GT and 2010-2014 GT500 Mustangs
Description
Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.
Superior Quality. These Ford Racing 3.55 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.
Application. This Ford Racing Ring and Pinion Gear set will fit 11-14 Mustang GTs and 11-12 Shelby GT500s. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.
Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.
Superior Quality. These Ford Racing 3.55 Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion.
Application. This Ford Racing Ring and Pinion Gear set will fit 11-14 Mustang GTs and 11-12 Shelby GT500s. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.
Attention 2010 and newer Mustang Owners. Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. Because of this you will require a new 8.8" rear gear pinion bearing (Ford part# 9L3Z-4630-A) for proper installation, please see drop down option above.
Technical Note. Installation costs will vary, but a good rule of thumb is between $250 and $300. Be sure to work with a reliable shop that you trust for installations. You can also save money on your installation labor by having your Trac-Lok rebuilt at the same time as your gears are installed, see drop down option above.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (10) Differential housing cover bolts
- (1) Differential housing cover
- (1) Parking brake cable (note: do not disconnect from brake caliper lever)
- (1) Rear brake caliper
- (1) Bolt for rear wheel speed sensor
- (1) Differential pinion shaft lock bolt (remove and discard)
- (1) Differential pinion shaft
- (1) Axle shaft U-washer
- (1) Axle shaft
- (1) Rear wheel speed sensor
- (1) Companion Flange Holding Tool
- (1) Companion Flange Remover
- (1) Soft-faced hammer
- (1) Pinion Bearing Cone Remover
- (1) Pinion Bearing Cone Replacer
- (1) Pinion bearing adjustment shim (measured thickness recorded)
- (1) Pinion bearing cups (if replaced, new ones required)
- (1) Spacer between rear pinion bearing cup and axle housing (if applicable, save for reuse)
- (1) Dial Indicator with Bracketry TOOL-4201-C or equivalent
- (1) Pinion Bearing Cup Replacer
- (1) Rear axle lubricant (e.g., Motorcraft® SAE 75W-140 Synthetic Rear Axle Lubricant XY-75W140-QL)
- (4 oz) Friction modifier additive (e.g., M-19546-A12 or Motorcraft XL-3)
- (1) Maximum strength retaining compound (e.g., Loctite 638)
- (10) New differential ring gear bolts
- (2) Differential bearing shims (original removed ones plus increased size for preload)
- (2) Differential bearing caps
- (4) Differential bearing cap bolts
- (1) Differential Shim Installer (for seating differential bearing shims)
- (1) Differential housing cover gasket or silicone sealant
- (1) Filler plug
- (1) Rear brake disc
- (1) Rear axle universal joint flange
- (1) Pinion nut (new)
- (1) Differential drive pinion collapsible spacer
- (1) Rear axle drive pinion shaft oil slinger
- (1) Rear axle drive pinion seal
- (1) Premium-Life Grease XG-1-C or equivalent meeting Ford ESA-M1C75-B spec
- (1) Rear axle plug
- (1) Motorcraft®High Contrast Hypoid Gear Marking Compound XG-14
Tech Specs
Approximate RPM for 2011+ GT
| Manual | ||||||
| Gear | @25 MPH | @35 MPH | @45 MPH | @55 MPH | @65 MPH | @75 MPH |
| 1 | 4007 | 5610 | ||||
| 2 | 2660 | 3724 | 4788 | 5838 | 6917 | |
| 3 | 1850 | 2590 | 3330 | 4070 | 4810 | 5550 |
| 4 | 1445 | 2023 | 2601 | 3179 | 3757 | 4335 |
| 5 | 1095 | 1533 | 1971 | 2408 | 2846 | 3284 |
| 6 | 712 | 996 | 1281 | 1565 | 1850 | 2135 |
| Automatic | ||||||
| Gear | @25 MPH | @35 MPH | @45 MPH | @55 MPH | @65 MPH | @75 MPH |
| 1 | 4566 | 6393 | ||||
| 2 | 2562 | 3586 | 4611 | 5636 | 6660 | |
| 3 | 1665 | 2331 | 2997 | 3663 | 4329 | 4995 |
| 4 | 1251 | 1752 | 2252 | 2753 | 3253 | 3754 |
| 5 | 949 | 1329 | 1708 | 2088 | 2468 | 2847 |
| 6 | 756 | 1059 | 1362 | 1664 | 1967 | 2269 |
4.9
