Gearworks

10" Pinion support for Gearworks differential housings
All Gearworks items are limited stock, Please contact us for availability before placing order.

The Gearworks pinion support is crafted from 2024 T-351 billet and deep hard anodised black. Designed for endurance racing, it features a lubrication passage for cooler operation and uses industry-standard bearings for cost efficiency, outperforming drag racing-focused alternatives. See below for more information.

Set of 10 xARP 1/2″ x1.25" Ring Gear Bolts
All Gearworks items are limited stock, Please contact us for availability before placing order.

• ARP 1/2″ Ring Gear Bolts
• 9/16″ Spanner Size 
• 1.25″ Usable length
• For use on RD249CE ARB Air Locker

Pinion Shim Set
All Gearworks items are limited stock, Please contact us for availability before placing order.

Pinion shim set is designed for Ford 9″ cases using 7/16" pinion support bolts. (All Gearworks cases come this way). These are high quality USA made steel shims with tabs that have the thickness stamped into them 0.010″ to 0.021″.

Gearworks 1350 35 Spline Pinion Yoke with Seal Guard 
All Gearworks items are limited stock, Please contact us for availability before placing order.

Gearworks 1350 35 Spline Pinion Yoke with seal guard welded on.

Note - Other Yoke sizes are available - Please call +44 (0) 1732 463600 for further details 

10x ARP 7/16”x1.250" Ring Gear Bolts
All Gearworks items are limited stock, Please contact us for availability before placing order.

• 7/16” ARP Ring Gear Bolt
• 5/8" Spanner Size
• (1.250″ Long)
• For ARB RD99 & RD99CE

10x ARP 7/16" x 1.00"  Ring Gear Bolts
All Gearworks items are limited stock, Please contact us for availability before placing order.

• ARP 7/16" Ring Gear Bolts
• 1/2″ Spanner Size
• 1.00″ Usable Length

10x ARP 1/2" x 1" x 10 Ring Gear Bolts
All Gearworks items are limited stock, Please contact us for availability before placing order.

• ARP 1/2″ Ring Gear Bolts
• 3/4″ wrenching
• 1.00″ Usable length

Flanged Pinion Nut 
All Gearworks items are limited stock, Please contact us for availability before placing order.

35 Spline 1″ UNF Flanged Pinion Nut. Uses 1-1/2″ Socket. 

For retaining the UJ Yoke on the input pinion shaft of the Gearworks differential housings 

Note - Sold individually - Price is for one nut 

High Pinion Big Bearing Case 

• Designed for extreme off-road applications requiring a high pinion front or rear.
• Fits standard 9″ housings while utilising 10″ gears—proven in Ultra4 racing.
• Reinforced bottom & smooth face for durability and rock clearance.
• Dual load bolts prevent ring gear deflection.
• 5x 7/16″ pinion support bolts for maximum retention.
• Tall tail bearing & bolt-in retainer plate increase load capacity.
• Billet Chromoly main caps secured with ARP 9/16″ studs.
• Pre-machined & drilled/tapped for ARB air lockers.

Differential Gasket

ARB Ford, 40 Spline Diff Locker

Gearworks 3.812″ Nodular Iron Load Bolt Case
All Gearworks items are limited stock, Please contact us for availability before placing order.

• Heavy-duty 3.812″ bearing bore supports 2” 45 spline or 1.750” 40 spline spools.
• Load-bearing bolt prevents gear deflection, maintaining correct running geometry.
• Longer pinion pocket bearing with a retainer plate for added support.
• Compatible with standard 9” Ford pocket bearing for emergency use.
• Chromoly steel main caps & spanner nuts prevent deflection and gear failure.
• Secured with 9/16″ ARP studs for maximum strength.
• CNC machined to fit 9.500” OD ring gears.
• Integrated set screws at 3 & 9 o’clock positions for easy removal.
• Blind-drilled pinion support bolt holes prevent sealing issues with skid plates.

Full description below.

High Pinion Small Bearing Case 
All Gearworks items are limited stock, Please contact us for availability before placing order.

• Designed for high-demand off-road applications.
• Fits standard 9″ housings and utilises 10″ gears.
• Extra thick bottom with a smooth face for rock clearance and durability.
• Load bolt prevents ring gear deflection.
• 5x 7/16″ pinion support bolts ensure a secure fit under extreme conditions.
• Taller-than-stock 9″ tail bearing increases load capacity, secured by a bolt-in retainer plate.
• Forged Chromoly main caps with high-quality ARP 12-point bolts.
• Pre-machined, drilled, and tapped for ARB air lockers.

See full product description below.

All Gearworks items are limited stock, Please contact us for availability before placing order.

• 7/16″ pinion support bolts for added strength.
• Taller pocket bearing with increased load capacity, secured by a retainer plate and 3 flat head screws.
• Compatible with 9″, 9.5″ & 10″ gears.
• Large load bolt prevents ring gear deflection.
• Forged Chromoly caps, secured by ARP 12-point cap screws.
• 2 jack screw holes for easy third-member removal.
• Pre-machined, drilled, and tapped for ARB air locker installation.

See full description below.

All Gearworks items are limited stock, Please contact us for availability before placing order.

Timken carrier bearings and races to fit Small Bearing (3.250″) bore cases and spools or lockers with a 2.00″ journal.

2 x Bearings and 2 x Races 

All Gearworks items are limited stock, Please contact us for availability before placing order.

Timken bearings and races to fit Big Bearing 3.812″ cases and spools or lockers with a 2.25″ bearing journal.

2 x Bearings and 2 x Races 

All Gearworks items are limited stock, Please contact us for availability before placing order.

Timken carrier bearings and races to fit 3.812″ bore cases and spools or lockers with a 2.00″ journal. Allows use of RD99 and RD99CE ARB lockers and 2.00″ journal spools and lockers in the heavy duty 3.812″ cases.

2 x Bearings and 2 x Races 

All Gearworks items are limited stock, Please contact us for availability before placing order.

• 35 Spline Spool 2" Journals (for use with small bearing casings)
• Supplied without Carrier Bearings or Ring Gear Bolts 

Note- can be fitted to big bearing casings if using correct bearings (GW385A/382A)

All Gearworks items are limited stock, Please contact us for availability before placing order.

• Made from 4140 Chromoly for maximum strength.
• 1/2″ and 7/16″ bolt holes for versatile mounting.
• Extra thick ring gear flange reduces deflection and allows for load bolt clearance.
• 5.5″ of spline engagement for easier axle length adjustments.
• 1.4KG heavier than the HD spool with significantly increased flange rigidity.
• Ideal for reversed applications like flipped rear third members or high pinion setups.
• Fits Big Bearing Casings.

See full product description below.

All Gearworks items are limited stock, Please contact us for availability before placing order.

Gearworks 40 spline spool is made from 4140 Chromoly making it one of the strongest 40 spline 2.00″ journal spools on the market, it has both 1/2″ and 7/16″ bolt holes and the ring gear flange is pre-machined for load bolt cases.

Note For Use with Small Bearing Cases - it can be fitted to Big Bearing Cases but we would recommend using the 40 Spline XHD Spool for this - Pt No - GWC5040XHD.

All Gearworks items are limited stock, Please contact us for availability before placing order.

Gearworks 2″ 45 Spline Spool 30° Pressure angle. This spool has 2.25″ journals and has 1/2″ and 7/16″ bolt holes.

Note 45° Pressure Angle Spools are available - Please contact us for details 

All Gearworks items are limited stock, Please contact us for availability before placing order.

Heat treated 3/4-10 Load Bolt Kit fits all of the Gearworks cases. Includes nut and o-ring.

NOTE - New Gearworks Casings come with the Load Bolts 

All Gearworks items are limited stock, Please contact us for availability before placing order.

• Manufactured for Gearworks by U.S Gear for extreme duty racing applications.  U.S Made of domestic 9310 forgings then heat treated,
• Ratios are available in Normal cut, Reverse cut and Amboid cut - Dependent on fitment.
• Pinions are 35 splined to accept the 35 spline yokes 
• Available in a choice of ratios; 4.57 – 4.86 – 5.14 – 5.43 – 5.83 – 6.20

Please Call on +44 (0) 1732 463600 for further information and ordering.

All Gearworks items are limited stock, Please contact us for availability before placing order.

• Proven race-winning design, used in more off-road victories than any other high-pinion drop-out.
• Custom-built for front or rear applications.
• 3.812″ carrier bore with ARB RD249CE air locking differential.
• Pre-machined, drilled, and tapped for ARB air lockers.
• Massive 9/16″ 8740 Chromoly main studs and billet Chromoly main caps.
• 2 load bolts to prevent ring gear deflection.
• .812″ tall tail bearing, secured by a bolt-in retainer plate.
• Hard anodised 2024 billet pinion support with large Timken bearings.
• Double-lip pinion seal with dust exclusion lip.
• 1/2″ ARP ring gear bolts and a billet 1350 yoke with welded seal guard.
• Available gear ratios: 4.57, 4.86, 5.14, 5.43, 5.83, 6.20.

As these are built to individual specification please call us on +44 (0) 1732 463600 as there are numerous options in terms of gear type and ratio.

We Ship the built housing mounted to a wooden frame in a plastic shipping crate .
Price listed is the Starting Price - subject to individual specification.