ReadyLIFT 5.0-Inch Tapered Rear Block Kit | OEM-Style Fabricated Steel | Pinion Angle Correcting Taper + Offset Pin | 1-Piece Driveshaft Only | 2017–2026 Ford F-250 Super Duty 4WD | SKU: 66-2750

Verified Fitment

Does NOT fit:

• 2019–2026 Ford F-350 Super Duty — explicitly excluded per ReadyLIFT's product documentation; the 2019+ F-350 geometry is not confirmed for this block
• 2-piece driveshaft applications — the tapered geometry and offset pin in this kit are engineered for 1-piece driveshaft pinion angle correction; 2-piece driveshaft F-250 trucks require a different approach — see ReadyLIFT 66-2741 (4-inch flat block with billet carrier bearing spacer)
• Ford F-250 Super Duty 2WD — 4WD only
• 2016 and earlier Ford F-250 Super Duty — different rear suspension and U-bolt geometry
• F-350 DRW (Dually) trucks — included U-bolts are not sized for dually axle configurations
• Trucks with aftermarket or factory add-on air spring/load leveling kits attached to the bump stop tangs — see critical compatibility note

Factory block variability — net lift may differ: Net lift height gained from this kit will vary based on whether your F-250 has an existing factory rear block installed. Trucks with a factory block will gain less net height than stock-height trucks. Measure your current axle-to-frame height before ordering to confirm expected net gain.

1-piece vs. 2-piece driveshaft identification: Look under the truck at the rear driveshaft. A 1-piece driveshaft runs as a single continuous tube from the transfer case output to the rear axle with no intermediate frame mount or carrier bearing. A 2-piece driveshaft has a carrier bearing bracket mounted to a frame crossmember midway along the driveshaft. If you see that bracket, you have a 2-piece driveshaft — order 66-2741 instead.

Component Specifications

Why tapered — not flat: At 5 inches of rear block height, simply placing a flat block between the axle perch and the leaf spring changes the pinion angle of the rear differential. On a 1-piece driveshaft, the driveshaft runs at a fixed angle from the transfer case output to the rear axle — a change in pinion angle at the axle end creates a driveline angle mismatch that produces vibration at highway speed and accelerates U-joint wear. The tapered geometry of the 66-2750 block counteracts this pinion angle change by wedging the axle back to the correct angular orientation relative to the driveshaft — maintaining driveline geometry without a separate carrier bearing spacer.

Why no billet driveline spacer: The 66-2741 (4-inch flat block, 2-piece driveshaft) includes a billet carrier bearing spacer because the 2-piece driveshaft's carrier bearing must be repositioned when the axle drops. The 1-piece driveshaft application (this kit) has no carrier bearing to reposition — the tapered block geometry and offset pin address the pinion angle correction directly.

What Is and Is NOT Included

Note on what's not included vs. 66-2741: The 66-2741 (2-piece driveshaft) includes a billet carrier bearing spacer. The 66-2750 (1-piece driveshaft) does not — the tapered design performs the equivalent geometry correction without a separate spacer component. If you receive the 66-2750 and notice there's no driveline spacer, that is correct for this kit.

Critical Compatibility

Driveshaft type is the single most important pre-order check. The 66-2750 is engineered specifically for 1-piece driveshaft geometry correction through its tapered block design and offset pin. Installing a tapered pinion-correcting block on a 2-piece driveshaft application produces incorrect geometry at the carrier bearing — the carrier bearing spacer that the 2-piece application requires is not included because the tapered design assumes a 1-piece driveshaft pinion angle relationship. Confirm your driveshaft type before ordering.

1-piece vs. 2-piece summary:

• 1-piece driveshaft + 5-inch block = 66-2750 (this kit) — tapered block + offset pin
• 2-piece driveshaft + 4-inch block = 66-2741 — flat block + billet carrier bearing spacer

Air spring/load leveling exclusion — structural integrity. Same warning as the 66-2741: air spring systems mounted to the bump stop tangs place upward structural load on the tang that it is not designed to carry. ReadyLIFT explicitly states this will void the warranty and can cause bump stop tang failure. The exclusion is absolute — regardless of air bag system brand or mounting configuration.

F-350 2019+ exclusion. Same as the 66-2741: the 2019+ F-350 geometry is not confirmed for this block. Source documentation explicitly says "Not for use on 2019-UP F350." Do not order for a 2019+ F-350.

Installation Notes

Skill level: Beginner to intermediate — bolt-on rear block installation. No cutting or welding required.

Tools required: Floor jack and rated stands, basic socket set, torque wrench.

Driveshaft confirmation — do before ordering: Confirm 1-piece driveshaft by looking for the absence of a carrier bearing mount under the truck. If you see a carrier bearing bracket on the frame midway along the driveshaft, you have a 2-piece — order 66-2741.

Offset pin orientation — read before installing: The offset pin sets the pinion angle correction direction of the tapered block. Verify orientation per ReadyLIFT's installation instructions before installing the blocks. Installing the tapered blocks in the wrong orientation reverses the pinion angle correction.

Installation sequence:

1. Safely lift and support the vehicle with the rear axle at full droop.
2. Remove factory U-bolts and lower the rear axle.
3. Remove factory rear block (if present).
4. Position the tapered ReadyLIFT block between the axle perch and the leaf spring — confirm correct taper orientation and offset pin position per installation instructions.
5. Install the long e-coated U-bolts and thread Grade 10 nuts.
6. Lower the axle to ride height.
7. Torque U-bolts to OEM specification at ride height — not at full droop. Final torque must be applied with the truck's weight on the rear suspension.

Post-installation mandatory steps:

1. Re-torque U-bolts after 500 miles — blocks settle slightly under initial load cycling.
2. Alignment verification — recommended after any rear height change.
3. Headlamp aim adjustment — required per ReadyLIFT installation advisory.
4. ADAS verification — check all active and passive safety systems for proper function.

Common Questions

What's the difference between the 66-2750 and the 66-2741?
Driveshaft application and block design. The 66-2741 is a 4-inch flat block with a billet carrier bearing spacer — for 2-piece driveshaft F-250 trucks where the carrier bearing must be repositioned at the new block height. The 66-2750 is a 5-inch tapered block with an offset pin — for 1-piece driveshaft F-250 trucks where the tapered geometry corrects pinion angle directly without a separate carrier bearing spacer. Both are confirmed for 2017–2026 F-250 4WD. Driveshaft type determines which kit is correct for your truck.

Why is there no billet driveline spacer in this kit?
The 1-piece driveshaft has no carrier bearing to reposition — the carrier bearing spacer in the 66-2741 is only needed for 2-piece driveshaft geometry. On a 1-piece driveshaft, the tapered block design and offset pin correct the pinion angle directly. No separate spacer is needed or appropriate for this application.

How do I confirm my F-250 has a 1-piece driveshaft?
Look under the truck at the rear driveshaft. A 1-piece driveshaft runs as a single tube from the transfer case output to the rear axle with no support bracket in between. If you see a carrier bearing mount on the frame partway along the driveshaft, you have a 2-piece driveshaft — order 66-2741 instead.

My F-250 has a factory rear block — how much lift will I actually get?
Less than 5 inches. ReadyLIFT explicitly notes that final lift height varies based on the factory block your truck has installed. The net gain is the difference between the factory block height and this kit's 5-inch block. Measure your current axle-to-frame height to estimate net gain before ordering.

Can I use this block with my air bag load leveling kit?
No. ReadyLIFT explicitly prohibits use with air spring systems attached to the bump stop tangs — this will void the warranty and can cause structural failure of the bump stop tang.

Does the offset pin go on both blocks or just one?
The offset pin sets the pinion angle orientation of the tapered blocks. Follow ReadyLIFT's installation instructions for correct offset pin positioning — orient both blocks correctly for the intended pinion angle correction.

The Obsidian Take

The 66-2750 is the 1-piece driveshaft counterpart to the 66-2741 — same OEM-style fabricated steel construction, same integrated bump stop landing pads, same Grade 10 hardware, same no-extrusions engineering philosophy, and the same application purpose: restore rake for towing, pair with a leveling kit for a leveled-all-the-way-around stance.

The tapered design is the engineering distinction that makes this kit work correctly on the 1-piece driveshaft platform. A flat block at 5 inches rotates the pinion angle forward, creating a driveline angle mismatch that produces highway vibration. The taper in the 66-2750 counteracts that rotation, keeping the axle pinion at the correct angle relative to the 1-piece driveshaft's fixed geometry. The offset pin sets the precise orientation. The result is 5 inches of rear block height with correct driveline geometry — not just height.

The driveshaft identification step is the one check that determines whether this kit or the 66-2741 is correct for your truck. It takes 30 seconds under the truck. A carrier bearing bracket midway along the driveshaft = 2-piece = 66-2741. No carrier bearing bracket = 1-piece = 66-2750. Do it before ordering.

This SKU is for: 2017–2026 Ford F-250 Super Duty 4WD owners with confirmed 1-piece driveshaft who want 5 inches of rear block height to restore towing rake, pair with an existing leveling kit, or achieve a leveled stance front and rear — without air bag systems attached to the bump stop tangs.

This SKU is NOT for: F-350 owners (2019+ explicitly excluded), 2-piece driveshaft F-250 trucks (order 66-2741), F-250 2WD trucks, DRW/dually configurations without verification, anyone running air spring or load leveling systems on the bump stop tangs, or 2016 and earlier Super Duty owners.

SAE J2492 Warning
⚠ WARNING: By installing this product, you acknowledge that the suspension of this vehicle has been modified. As a result, this vehicle may handle differently than factory-equipped vehicles. As with any vehicle, extreme care must be used to prevent loss of control or rollover during sharp turns or abrupt maneuvers. Always wear seat belts, and drive safely, recognizing that reduced speeds and specialized driving techniques may be required. Failure to drive this vehicle safely may result in serious injury or death. Do not drive this vehicle unless you are familiar with its unique handling characteristics and are confident of your ability to maintain control under all driving conditions.

Manufacturer Data Disclaimer
Product specifications, fitment data, and feature details are sourced from ReadyLIFT manufacturer documentation and verified third-party technical references current at the time of publication. ReadyLIFT reserves the right to modify product specifications without notice. Confirm 4WD drivetrain, 1-piece driveshaft, F-350 exclusion, and air bag system compatibility before ordering. OFAS is not responsible for incompatibility resulting from 2-piece driveshaft applications, 2019+ F-350 applications, DRW configurations, incorrect block taper orientation during installation, or bump stop tang failure resulting from air spring system use.

Prop 65 Warning
⚠ WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.

Non-Returnable Notice
This item is non-returnable once installed. Verify 4WD drivetrain, 1-piece driveshaft, and air bag system status before ordering. Questions before ordering? Text (469) 407-7538.