Crown wheel and pinion 3.91:1 for Volvo Amazon, 1800, 140, 164, 240, 260, 740, 760, 780, rear axle M30

Crown wheel and pinion for the differential in rear axle M30 and M1030. The ratio is 3.91:1. The rear axle is of Spicer type, where the differential cover sits at the back and is covered by a tin lid.

Check the rear axle type before ordering. Spicer M27 has axle tubes with an outer diameter of 57 mm, M30 has 63.5 mm tubes. On an ENV rear axle, the differential is inserted into the axle housing from the front — it does not fit there. The ratio is marked on a tag at the differential cover, and on later axles on a plate underneath the axle.

THIS PART FITS

• Volvo Amazon: all models WITH rear axle M30 or M1030 of Spicer type
• Volvo 1800: all models WITH rear axle M30 or M1030 of Spicer type
• Volvo 1800ES: all models WITH rear axle M30 or M1030 of Spicer type
• Volvo 140: all models WITH rear axle M30 or M1030 of Spicer type
• Volvo 164: all models WITH rear axle M30 or M1030 of Spicer type
• Volvo 240: 1975–1978, rear axle M30 or M1030 of Spicer type
• Volvo 260: 1975–1978, rear axle M30 or M1030 of Spicer type
• Volvo 740: 1985–1989, rear axle M30 or M1030 of Spicer type
• Volvo 760: 1985–1987, rear axle M30 or M1030 of Spicer type
• Volvo 780: 1986–1987, rear axle M30 or M1030 of Spicer type

Specifications

• Type: crown wheel and pinion for differential
• Ratio: 3.91:1
• Rear axle type: M30, M1030
• Make: Spicer

Fitting

Replacement requires specialist knowledge, special tools and measuring equipment to set gear mesh and preload.

Replaces Volvo OE number: 274206

Frequently Asked Questions

How do I know if my car has a M30 rear axle?

Measure the outer diameter of the axle tubes. M30 has 63.5 mm tubes, M27 has 57 mm. The differential cover on a Spicer axle sits at the back and is covered by a tin lid.

Does it fit an ENV rear axle?

No. On an ENV rear axle the differential is inserted into the axle housing from the front, and the crown wheel does not fit there.

Where is the ratio marked on the rear axle?

On a tag at the differential cover. On later axles it is marked on a plate underneath the axle.