Knuckle Arm

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The "Knuckle arm" (steering arm) is sandwiched between the Ball Joint and the strut assembly.

Overview

There is only one size for B110, the 45mm strut type.

Datsun knuckle arms come in two basic sizes, 75mm & 80mm:

• narrow bolt spacing for 45mm strut tubes (used by B110)
• wide bolt spacing for 50.8 mm strut tubes (used by most other Datsuns)

Additionally, the size of the taper hole for the ball joint is important.

• B110 and B210 and B310 small uses the small taper
• Some B310 use a large taper

Then there is the length of the arm -- long arm give a slower steering response, but less effort is required to turn the wheels. Shorter arms give faster response.

Short-arm Modified for use with 2" struts

Comparison

It seems only B310 with W5000/W5060 steering arm uses the larger tie-rod ends.

Knuckle Arm

B120 early +H1000/H1025 rod assy
H1000/H5000

B120 7510- +H1025 rod assy
H7400 -8507
H7440 8508-
   

B210 early +H5025
H5000
H7400 late van

B210 late +H5025 rod assy
H7400

PB210/USA B210 +H5800 rod assy
U0101

B310 +W5025 rod assy
H7400 regular cars
   
W5000/W5060 power cars

B310 Steering Knuckle Arms

B310

Part Numbers

steering arm
40052 = Knuckle Arm RH
40053 = Knuckle Arm LH

Knuckle Arm RH

• B10: 40052-18000 (different from newer models)
• B110: 40052-H1000 <- 40052-H5000
• PB110: 40052-H2501
• B120: 40052-H5000 to 1974, 40052-H7400 (75-8504), 40052-H7440 (8504-)
• B210: 40052-H5000 (74-75 A12)
• B210: 40052-H7400 (1976-up A engine, except USA)
• B210: 40052-U0101 (USA, also PB, also L16)
• B310: 40052-W5000 (All US, all A15, most A14)
• B310: 40052-H7200 (A12, A13, and budget A14 models)
• B310: 40052-W5060 (big engines, 8001-up)

Spacers

When Lowering the front suspension, if going ultra-low, strut spacers (roll center adapters) are used. They are intended to correct the lower arm angle when the vehicle height is dropped, to minimize bump steer.

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