7×41 Differential Assembly for Isuzu NPR

This Isuzu NPR differential assembly is offered in a 7×41 gear-tooth configuration. The original axle and differential identification are the main selection details.

Seven pinion teeth and 41 crown-wheel teeth give a calculated reduction ratio of approximately 5.857:1. Compare the housing, axle-shaft splines and input flange before choosing the assembly.

Send the vehicle and axle identification, crown-wheel and pinion tooth counts, spline details and quantity. Include the flange and housing dimensions for the assembly required.

Contact TOSEN for a quotation or browse Differential Assemblies.

A 7×41 gear-tooth configuration defines the Isuzu NPR differential assembly on this page: seven teeth on the pinion, forty-one on the crown wheel and a calculated final-drive ratio of approximately 5.857:1 between them. The propeller shaft drives the pinion, the crown wheel reduces the speed and redirects the drive through a right angle, and the side gears inside the carrier share it out between the two rear axle shafts, which turn at different speeds from each other around corners. The unit is supplied as an assembly for installation into the NPR rear axle, replacing the original final drive in one exchange.

• Component: differential assembly for the Isuzu NPR
• Gear tooth combination: 7×41 — seven pinion teeth against forty-one crown-wheel teeth
• Final-drive figure: 41 divided by 7, approximately 5.857:1
• Identification basis: axle data, the original assembly, or a tooth count of the removed gears

The 7×41 differential assembly is the correct choice for an Isuzu NPR whose axle data, original assembly identification or counted gears show seven pinion teeth and forty-one crown-wheel teeth, and the workshop establishes that pairing before the order is written. NPR trucks appear with more than one final-drive ratio, so the model name alone never settles the question; the figures come from the vehicle’s axle data, from the identification on the original assembly or from a direct tooth count on the removed gears. Once the seven-and-forty-one pairing is established, the housing, the axle-shaft splines and the input flange are compared between the old unit and the ordered assembly, because an assembly with the correct ratio still needs matching interfaces to install cleanly.

• Ratio sources: the vehicle’s axle data, identification on the original assembly, a tooth count of the removed gears
• Figures to match: seven pinion teeth against forty-one crown-wheel teeth
• Interfaces to compare: housing, axle-shaft splines, input flange
• Caution: the model name alone does not settle the ratio question

Every 7×41 differential assembly for the Isuzu NPR is inspected by TOSEN before it ships, with the pinion and crown-wheel teeth counted against the seven-and-forty-one specification and the housing, splines and input flange checked against the enquiry details. The inspection gives the calculated 5.857:1 ratio a physical verification, so the number on the page and the gears in the box agree. Customers verifying a ratio for a mixed fleet can request the counted record for each unit, which turns the ratio question into a documented fact rather than an assumption carried through the order.

What is the 7×41 differential assembly for the Isuzu NPR?

The 7×41 differential assembly for the Isuzu NPR is the final-drive assembly of the truck’s rear axle, specified by a pinion with seven teeth and a crown wheel with forty-one. The pairing produces a calculated reduction ratio of approximately 5.857:1, which multiplies torque at the rear wheels and lets them rotate at different speeds through corners. The unit is inspected by TOSEN before dispatch against the tooth counts and the interfaces in the enquiry.

What does the 7×41 marking mean on an NPR differential?

The figures are tooth counts: seven on the pinion and forty-one on the crown wheel, and the ratio between them is the final-drive figure of approximately 5.857:1. For every revolution of the crown wheel and the rear wheels, the propeller shaft completes about 5.857 revolutions, so the assembly trades propeller speed for axle torque at that rate. The same truck family is also seen with other ratios, which is why the count is confirmed from the vehicle rather than assumed from the name.

How is the ratio confirmed from the truck’s identification?

The axle data of the vehicle, the identification carried by the original assembly and a direct count of the removed gears are the three confirmation routes. Reading seven teeth on the pinion and forty-one on the crown wheel of the unit being replaced matches the assembly on this page, and the housing, the axle-shaft splines and the input flange complete the comparison. TOSEN checks the counted figures against each inspected assembly before dispatch, so the confirmed ratio is the shipped ratio.

What should be included in an enquiry for this 7×41 assembly?

Include the vehicle and axle identification, the ratio as read from the truck or counted on the old gears, the housing details, the axle-shaft splines and the input flange, with the quantity required and the destination. Adding photographs of the identification on the original assembly speeds the verification, and the enquiry then covers everything TOSEN checks before the assembly is dispatched.