8.8 in. 31 Spline Axle and 4.10 Gear Upgrade Kit - 5 Lug (86-93 5.0L)

8.8 in. 31 Spline Axle and 4.10 Gear Upgrade Kit - 5 Lug (86-93 5.0L)
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OUR PRICE$1,019.99(kit)
Market Price $1,152.59You Save 12% ($132.60)
Item # 99935
Ships the same business day
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Product Features

  • Put the power to the pavement
  • Ford Racing Traction - LOK limited slip differential with carbon discs
  • Ford Racing 4.10 gears
  • Ford Racing differential cover
  • Ford Racing 8.8in rear axle bearings and seals
  • Moser 31 spline 5-lug axles
  • Rear end installation and bearing kit
  • (2) bottles of Royal Purple Max Gear 85w140 Gear Oil
  • Fits 1986-1993 5.0L V8 Mustangs with 8.8" rear end
Performance Upgrade. Now you can upgrade the rear end of your 5.0L Fox Body Mustang to handle more power. This kit will replace your wimpy stock factory 28 spline rear with a heavy duty 31 spline setup that includes a Limited Slip "Posi" Differential, 31 spline 5-lug axles, steeper 4.10 gears and a aluminum differential cover.

Kit Includes. This 5-Lug 8.8in 31 Spline Axle and 4.10 Gear Upgrade Kit includes Ford Racing Traction LOK Limited Slip Differential, 4.10 Gears, Aluminum Differential Cover, Rear Axle Bearing & Seal Kit, Moser 8.8 31 Spline 5 Lug Axels, Motive Rear End Installation and Bearing Kit and (2) bottles of Royal Purple Max Gear 85w140 Gear Oil.

Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a new Speedometer Gear is an inexpensive way to fix this issue.

Application. This 8.8in 31 Spline Axle and 4.10 Gear Upgrade Kit will fit all 1986 to 1993 5.0L V8 Mustangs including the LX 5.0, GT and SVT Cobra models that have upgraded to 5 lug wheels.

Approximate RPM for 1986-1993 GT


Manual
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 4261 5965        
2 2516 3523 4529 5535 6542  
3 1682 2354 3027 3700 4372 5045
4 1264 1770 2276 2782 3287 3793
5 847 1186 1525 1864 2203 2541


Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3034 4248 5462 6676    
2 1854 2596 3338 4080 4821 5563
3 1264 1770 2276 2782 3287 3793
4 843 1180 1517 1854 2192 2529

Installation Time:

(approx) a Day

Difficulty Level:

Mechanical expertise or professional installation required.

What's in the box?

  • (1) Ring gear
  • (1) Pinion gear
  • (1) Limited Slip Differential
  • (2) 31 Spine Axles
  • (2) Outer Axle Shaft Bearings
  • (2) Seals
  • (2) one quart bottles of Max Gear 85w140 Gear Oil
  • (1) Axle Girdle Assembly
  • (1) Axle Girdle Gasket
  • (10) Washers
  • (10) Bolts
  • Front & Rear Pinion Bearing
  • Pinion Seal
  • Carrier Bearings
  • Carrier Shims
  • Differential Bearings
  • Crush Sleeve
  • Pinion Nut
  • Cover Gasket
  • Ring Gear Bolts
  • Brush
  • Gear Marking Compound
  • Loctite

What's in the box?

  • (1) Ring gear
  • (1) Pinion gear
  • (1) Limited Slip Differential
  • (2) 31 Spine Axles
  • (2) Outer Axle Shaft Bearings
  • (2) Seals
  • (2) one quart bottles of Max Gear 85w140 Gear Oil
  • (1) Axle Girdle Assembly
  • (1) Axle Girdle Gasket
  • (10) Washers
  • (10) Bolts
  • Front & Rear Pinion Bearing
  • Pinion Seal
  • Carrier Bearings
  • Carrier Shims
  • Differential Bearings
  • Crush Sleeve
  • Pinion Nut
  • Cover Gasket
  • Ring Gear Bolts
  • Brush
  • Gear Marking Compound
  • Loctite
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Fitment:
  • Foxbody 86, 87, 88, 89, 90, 91, 92, 93

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