Yukon Gear High Performance Gear Set For Ford 8.8in in a 3.08 Ratio
Most people shopping for a 3.08 Ford 8.8 gear set are not chasing big tires. They have a Mustang, Crown Victoria, Explorer or F-150 whose rear end howls at highway speed, or a car that someone geared too deep and now buzzes at 2,800 rpm on the interstate. The Yukon Gear & Axle YG F8.8-308 is a new 3.08 ring and pinion for the standard-rotation Ford 8.8 rear, with an 8.80 in. ring gear, a 30-spline pinion and 10 ring gear bolts.
The 8.8 is a hypoid rear: the pinion rides on two tapered bearings with a crush sleeve setting preload, and drives the ring gear bolted to the carrier. At 3.08 the driveshaft turns just over three times per tire revolution. That is one of the tallest ratios offered for this axle, so engine speed stays low at cruise, which helps noise and fuel use on a car or light truck running factory-size tires and an overdrive transmission. The trade is softer launch and less towing muscle. If you run oversize tires or pull a trailer, a 3.55 or 3.73 Yukon set suits the job better.
Separate gear noise from bearing noise first. Gear whine changes with load; bearing noise follows speed. Drain the oil, check the magnet, then look at the tooth faces and the contact pattern. Our Ford 8.8 rear axle problems guide walks through the common failures, and if the only complaint is chatter in turns, the Traction-Lok chatter fix may be all you need. To confirm your current ratio, read the axle code on the door tag or the tag on the cover bolt, or use the method in our guide to finding your axle ratio.
This set is listed for the standard-rotation Ford 8.8 rear with the 10-bolt cover. That axle sits under rear-drive and 4x4 Ford, Lincoln and Mercury vehicles from the early 1980s through 2014, including F-150, Mustang, Ranger, Explorer, Expedition, Bronco, Crown Victoria, Grand Marquis and Town Car, in both solid-axle and independent-rear versions. It is not for the 2015-and-later Super 8.8 with the 12-bolt cover, which uses its own gear sets such as our 2015-up F-150 3.73 set, and it is not for reverse-rotation front IFS 8.8 axles. Pinion bearing sizes and axle spline counts changed over the years, so match the bearing kit to your housing, or send us your year and VIN and we will confirm. More axle parts are in our hard parts collection.
Re-gearing an 8.8 means setting pinion depth, pinion bearing preload and backlash from scratch, so plan on new bearings. The USA Standard ZK F8.8 master overhaul kit or the Yukon kit for 2009-and-earlier 8.8 axles covers bearings, races, shims, crush sleeve and seals. Yukon's setup chart lists a 0.026 in. starting pinion shim for the 8.8, 14-19 in-lb of preload on new pinion bearings, and 60 ft-lb on the ring gear bolts and bearing caps; treat those as starting points and read the pattern with marking compound. On solid-axle housings the C-clip axle shafts have to come out to pull the carrier, so it is a good time to inspect the shaft bearing surfaces and seals.
If the axle has a Traction-Lok, replace the clutches while the carrier is out with a Traction-Lok clutch rebuild kit. Fill with 75W-140 or the grade your owner's manual lists, add friction modifier for limited slip units, then follow the ring and pinion break-in procedure with an oil change after the first 500 miles. Going from a deeper ratio to 3.08 changes the speedometer reading, so recalibrate it.
| Brand | Yukon Gear & Axle |
| Part number | YG F8.8-308 |
| Fits | Yukon Gear High Performance Gear Set For Ford 8.8in in a 3.08 Ratio |
| Type | Final Drive Gears |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. 2015-and-later F-150 and Mustang models use the Super 8.8 with a 12-bolt cover and a larger pinion, which takes different gear sets. This 3.08 set is for the standard-rotation 8.8 with the 10-bolt cover used through 2014.
It suits a truck or car on stock-size tires with an overdrive transmission that is mostly driven on the highway. If you tow, run tires much taller than stock, or want quicker launches, a 3.55 or 3.73 is the better choice.
A master overhaul kit with new pinion and carrier bearings, races, shims, crush sleeve and pinion seal, plus gear oil. If you have a Traction-Lok, a clutch rebuild kit and friction modifier are worth adding while the carrier is out.
Gear whine usually changes between acceleration and coast. Bearing noise tends to be a steady growl that follows road speed regardless of throttle. Pull the cover and check the magnet and contact pattern before you buy.
Yukon's chart lists a 0.026 in. starting pinion shim, 14-19 in-lb of preload on new pinion bearings, and 60 ft-lb on the ring gear bolts and bearing caps. Final pinion depth and backlash are set by reading the contact pattern.
Yes, any ratio change throws off the speedometer and, on electronically controlled transmissions, can affect shift timing. Recalibrate with a programmer or the correct speedometer gear for your vehicle.
