Yukon Gear Dura Grip Positraction For Ford 8.8in w/28 Spline Axles

Many Fox-body and SN95 Mustangs, Crown Victorias, Town Cars, Rangers and Mazda B-series pickups ride on a Ford 8.8 rear axle, and a lot of them came with either an open carrier or a Traction-Lok that has long since lost its grip. The Yukon Gear & Axle Dura Grip, part number YDGF8.8-28-1, is a clutch-type limited slip that replaces that carrier in any 28-spline Ford 8.8. It fits all gear ratios, so you do not have to match a carrier series to your ring and pinion.

How the Dura Grip works in a Ford 8.8

Ford's factory Traction-Lok is also a clutch unit, but its plates and the S-shaped preload spring wear thin, and once they do the axle behaves like an open diff: the lightly loaded tire spins and the car goes nowhere. The Dura Grip replaces the whole assembly with a new nodular iron case, forged 4320 chromoly spider gears and composite clutch packs. Spring preload keeps the clutches engaged at rest, and under power the spider gears drive the side gears outward to clamp the packs harder, linking both axle shafts so drive reaches the tire with grip. In a turn the clutches slip in a controlled way. Yukon designs the unit to be rebuilt, and assembles it in the USA.

Signs your 8.8 needs a new limited slip

• A single black stripe on launch, or the inside rear tire spinning when you pull out of a wet intersection
• Rear wheel off the ground and the car in neutral: it spins with no drag and the other side turns the opposite direction
• Shudder or a groaning chatter in tight parking lot turns. Our Traction-Lok chatter guide covers when fresh oil and additive fixes it and when the clutches are finished
• Clunk or slack on and off the throttle from worn thrust washers or a cross pin that has walked
• A regear or bearing job already planned, so the carrier is coming out anyway

How to confirm before you buy

Look for the irregular ten-bolt cover and the axle tag on one of the cover bolts, then pull an axle and count splines. This unit is 28-spline only; many F-150, Expedition and Explorer rears run 31-spline shafts and need the 31-spline 8.8 Dura Grip. Our 28 vs 31 spline guide shows the quickest ways to check, and Ford 8.8 rear axle problems lists the bearing and seal wear worth fixing while it is apart.

Fitment

• Ford 8.8 in. with 28-spline axles, all gear ratios
• Rear axle applications on the published list include 1979-2009 Mustang (solid axle), 1992-2011 Crown Victoria, 1981-2011 Town Car, 1990-2011 Ranger, 1978-1983 Fairmont, 1983-1986 LTD, 1987-1988 Thunderbird, 1979-1988 Cougar, Lincoln Continental and 1984-1992 Mark VII, and Mazda B3000, B4000 and Navajo
• 28-spline independent rear 8.8s such as 1989-1997 Thunderbird and Lincoln Mark VIII
• The reverse-rotation front 8.8 in 1997-2008 F-150 and Expedition 4x4, 1998-2008 Navigator and 2006-2008 Mark LT

Ford changed spline counts, axle ratios and even IRS versus solid axle within the same model names, so treat the list as a starting point and count splines. If anything is unclear, send us your year, VIN and the axle tag code before ordering. More carriers and gear sets are in our hard parts collection.

Install notes

• Rear 8.8 axles are held by C-clips: pull the cross pin bolt and pin, push the axle shafts in, remove the clips and slide them out. Front IFS 8.8 work means pulling the axle from the truck, see our 8.8 IFS front guide
• Use new carrier bearings and races. The Yukon 2009-and-down Ford 8.8 master overhaul kit covers carrier and pinion bearings, seal and shims; the Ford Racing M4210A install kit suits a regear
• Yukon's setup chart lists 14-19 in-lb pinion preload with new bearings and 0.006-0.011 in. backlash for the 8.8. Move the ring gear over with new bolts and check the contact pattern
• Fill with high-grade non-synthetic GL-5 gear oil and Yukon limited slip additive; Yukon says synthetic can make the clutches grab or chatter
• When the clutches eventually wear, the Yukon 14-plate Duragrip composite clutch set listed for the 8.8 is the rebuild path

Does this fit a 31-spline Ford 8.8?

No. It is for 28-spline 8.8 axles only. Count the splines on an axle shaft; if you have 31, order the 31-spline Dura Grip instead.

Do I need a specific gear ratio?

No. Yukon lists this carrier as fitting all gear ratios in the Ford 8.8, so 2.73, 3.27, 3.55, 3.73, 4.10 and deeper gears all mount to it.

Will it fit the front axle on my F-150 4x4?

The published fitment includes the 28-spline reverse-rotation front 8.8 used in 1997-2008 F-150 and Expedition 4x4 trucks, 1998-2008 Navigator and 2006-2008 Mark LT. Confirm the spline count on your inner axle shafts first.

Is this better than a new factory Traction-Lok?

Both are clutch-type limited slips. The Dura Grip uses a nodular iron case, forged 4320 chromoly spider gears and composite clutches, and the whole unit can be rebuilt with new clutches later.

What oil does it need?

Yukon recommends a high-grade non-synthetic GL-5 gear oil with its limited slip additive. Synthetic gear oil is not recommended and may cause aggressive or noisy operation.

Do I have to set up the gears again?

Yes. Any carrier swap means new carrier bearings and a fresh check of backlash and the gear pattern. Treat it as a gear setup job, not a bolt-in.