4.88 and 5.29 are two of the most common regear choices for modified Toyota Pickups and 4Runners. Both are deeper than many factory ratios, but 5.29 is approximately 8% deeper than 4.88, so it produces more engine RPM and torque multiplication at the same road speed.
General Tire-Size Rule of Thumb
Aftermarket Toyota drivetrain suppliers commonly recommend 4.88 gears for roughly 33-inch tires and 5.29 gears for 35-inch and larger tires. Treat that as a starting point, not an automatic answer.
Engine choice, transmission overdrive, vehicle weight, terrain, towing and highway use can all change which ratio feels best.
What 4.88 Does
- Restores some lost leverage after increasing tire diameter.
- Keeps highway RPM lower than 5.29 at the same speed.
- Is commonly paired with 33-inch tires on classic Toyota truck builds.
- Can be a better compromise for mixed street/trail use when very deep gearing is not required.
What 5.29 Does
- Provides more torque multiplication than 4.88.
- Helps compensate for larger/heavier tires and off-road load.
- Is commonly paired with 35-inch-and-larger tires.
- Raises engine RPM at a given road speed compared with 4.88.
Make Sure You Are Buying Gears for the Correct Differential
“Toyota 8-inch” is not specific enough by itself. 4-cylinder, V6/Turbo and high-pinion gear sets can be different. Later IFS front differentials also use their own gear sets. Follow the product's exact differential-family fitment.
Factory G144 4.88 Is a Special Case
If the truck has a factory G144 V6 4.88 third member, do not assume a normal aftermarket V6 4.88 ring-and-pinion set drops into the original G144 housing. See our Toyota 8-Inch Differential Ratio Identification Guide before ordering.
4WD Requires Matching Ratios Front and Rear
When regearing a 4WD truck, the front and rear final-drive ratios must match. Do not regear only one axle and then engage 4WD with mismatched ratios.
Before Choosing 4.88 or 5.29
- Confirm tire diameter.
- Confirm engine and transmission.
- Decide how much highway driving the truck sees.
- Confirm the differential family front and rear.
- Check whether the truck already has swapped third members.
- Plan bearing/setup parts and professional ring-and-pinion setup if needed.
For a mixed or unknown drivetrain, use Fitment Help with the axle code, current tire size, transmission and intended use.