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The Datsun 1200 used a leaf-spring live axle with an H145 differential. This is a Hitachi design with 145mm ring gear (5.71 inch). It is a lightweight unit suitable to handle the torque from an A12 engine. Light weight is good, remember that heavy parts take more horsepower to accelerate. Some Australian-assembled B110s used a Borg Warner Model 60 rear axle.

H145 vs. H165

Also see Rear Axle Swaps.

1 Specifications
2 Maintainence
3 Differential Lubricant
4 Part Numbers
5 Borg Warner Model 60
6 Leaf Spring Mounting
7 Unformatted Nissan Parts List

Specifications

The Hitachi H145 differential assembly is open (non-limited-slip) and the diff assembly unbolts from the front of the axle assembly (like Ford 9", but much smaller).

3.90:1 ratio - sedans and coupes
4.11:1 ratio - VB110 wagons with aluminum gear case
4.11:1 ratio - B120 Truck
Ring gear diameter: 145mm (5.71 inch)
Torque Rating: about 100 lb. ft.
Axle assembly width: 1305 mm drum-to-drum

Maintainence

The stock Datsun 1200 differential is a reliable, long lasting part behind an A12 or A13 engine.

As long as it doesn't run dry on gear lube it will usually last forever. So check it every few months for signs of leaking.
The only common maintainence is to pack the rear wheel bearings every two years or so. This will also keep the bearings quiet and reduce gear lube leakage into the brake area.

Differential Lubricant

Since the differential is a typical hypoid-gear unit, you can use any lubricant designed for such:

the traditional "90 weight" gear oil
the newer 75W140 multi-weight gear oil

For maximum fuel economy, use a modern multi-weight gear oil.

The original specifications (which are still OK to use) are:

Specification: API GL-4MIL-L-2105
- CHEVRON Multiservice Gear Lub. 75,80,90,140
- ESSO Gear Oil GP80,90,140
- MOBIL Mobilube EP or GX80-90, 90, 140
- SHELL Spirax 75EP,80EP, 90EP, 140EP
- SUNOCO Multipurpose GearLub. GL-480,90,140
- TEXACO Universal Gear Lub.EP80,90,140

reference: Owners manual
Online Owner's Manual

Part Numbers

Suppliers - USA

Rear Axle Seal

Nissan 43252-H1000 SEAL-OIL REAR AXLE SHAFT

Rear Axle Bearing

Nissan 43215-18000 BEARING-REAR AXLE
Nissan 43255-H1000 COLLAR-REAR AXLE BEARING

NOTE: 180 is B10 part number, so B10 and B110 should interchange

Differential Axle Bearing
1.1811 in. I.D; 0.6299 in. width; Fits H145 & H150.
Taper Bearing Assembly: Cone Length=0.6299" Bore=1.1811" Outer Diameter=2.4409" Width=0.6791" Cup Length=0.5512" Cone Radius=0.06" Cup Radius=0.06"}
Application: Alfa, Mitsubishi, Ford, Mazda, Nissan, Plymouth, Porsche, Subaru
PartsAmerica

SKF BR30206 - $16.99
BCA 30206 - $29.99
Motor City S30206 - $9.88

RockAuto.com

TIMKEN Part # 30206M - $14.96
BCA/NATIONAL Part # 30206 - $16.74

Pinion Seal
B110, through 1974 model year B210. Probably fits B10 as well.
Partsamerica.com pinion seal

SKF Oil Seal #550219 $22.99

Pinion Bearing
Fits many cars, GM, Nissan, Isuzu, Mazda, Opel, etc
Taper Bearing Assembly: Cone Length=0.7874" Bore=1.1811" Outer Diameter=2.4409" Width=0.8366" Cup Length=0.6693" Cone Radius=0.06" Cup Radius=0.06"}
Rockauto

BCA/NATIONAL Part # 32206 - $19.84

Partsamerica

SKF BR32206 - $18.99

Borg Warner Model 60

Australian-assembled B110s used a Borg Warner Model 60 rear axle, starting in Late 1971.

See main article: Borg Warner Differential

Leaf Spring Mounting

Rear axle mounting and Shocks

[

Spring Seat Assembly

Pickup

55262-G1000 SEAT ASSY-REAR SPRING, LOWER RH 1974-up JDM B120
55266-G1000 SEAT ASSY-REAR SPRING, LOWER LH 1974-up JDM B120

Sedan

55262-H1001 SEAT-rear suspension, lower JDM Sedan

Van

55262-H1401 SEAT-rear suspension (R.H), lower JDM Van
55266-H1401 SEAT-rear suspension (L.H), lower JDM Van

Coupe

55262-H1801 SEAT-rear suspension (R.H), lower JDM Coupe
55266-H1801 SEAT-rear suspension (L.H), lower JDM Coupe

U-bolts

55247-H1001 CLIP-rear spring JDM ALL (except van)
55247-H1401 CLIP-rear spring JDM Van
55247-G1000 CLIP-REAR SPRING JDM B120 7510- [4-leaf packs]
55247-G1060 CLIP-REAR SPRING JDM B120 HARD 7804- [Heavy 5-leaf packs]

Unformatted Nissan Parts List

Nissan North America

B210 01551-00111 CLIP-BRAKE TUBE 2 -
B210 01551-00121 CLIP-BRAKE TUBE 1 0874-
B110 08912-43810 NUT-HEX SELF LOCK 8 -
B210 08912-43810 NUT 8 -
B110 08915-23810 WASHER-SPRING LOCK 8 -
B210 08915-23810 WASHER-LOCK 8 -
B110 32103-14600 ASSY-PLUG DRAIN 1 -
B210 32103-14600 ASSY-PLUG,DRAIN 1 -
B210 32103-U8400 ASSY-PLUG,DRAIN 1 - 2 32103-14600
B310 32103-U8401 PLUG ASSY-DRAIN 1 -
B110 38162-G0300 ASSY-SHAFT REAR AXLE 2 -
B210 38162-G0300 ASSY-SHAFT,REAR AXLE 2 -
B310 38162-H8500 SHAFT ASSY-REAR AXLE(L=612) 2 -
B110 38322-55100 ASSY-BREATHER 1 -
B210 38322-55100 ASSY-BREATHER 1 -
B310 38322-55100 BREATHER-REAR AXLE CASE 1 -
B110 40222-18000 BOLT-HUB ROAD WHEEL 8 -
B210 40222-18000 BOLT-HUB ROAD WHEEL 8 -
B310 40222-18000 BOLT-HUB ROAD WHEEL 8 -
B110 40225-27700 NUT-ROAD WHEEL 1 16 -
B110 40300-H1001 ASSY-ROAD WHEEL 4JX12 3 DELUXE -
B110 40310-H1772 SET-TIRE & TUBE 6.00-12-4PR WITHE FMVSS 3 OP -
B110 40310-H1928 TIRE 6.00-12-4PR SNOW FMVSS 3 OP -
B110 40310-H1940 SET-TIRE & TUBE 155SR12 RADIAL FMVSS 3 OP -
B110 40312-H1922 TIRE 6.00-12-4PR FMVSS 3 -
B110 40315-H1100 COVER-ROAD WHEEL 2 DELUXE (OP STD) -
B110 40315-H1800 COVER-ROAD WHEEL 2 OP COUPE -
B110 40315-H1801 COVER-ROAD WHEEL (MEXICO MADE) 2 COUPE 0872- 5 40315-H1800
B110 40321-18000 WEIGHT 10G WHEEL BALANCE 0 -
B110 40321-H1000 WEIGHT 10G WHEEL BALANCE 0 - 2 40321-18000
B110 40322-18000 WEIGHT 20G WHEEL BALANCE 0 -
B110 40322-H1000 WEIGHT 20G WHEEL BALANCE 0 - 2 40322-18000
B110 40323-18000 WEIGHT 30G WHEEL BALANCE 0 -
B110 40323-H1000 WEIGHT 30G WHEEL BALANCE 0 - 2 40323-18000
B110 40324-18000 WEIGHT 40G WHEEL BALANCE 0 -
B110 40324-H1000 WEIGHT 40G WHEEL BALANCE 0 - 2 40324-18000
B110 40325-18000 WEIGHT 50G WHEEL BALANCE 0 -
B110 40325-H1000 WEIGHT 50G WHEEL BALANCE 0 - 2 40326-18000
B110 40326-18000 WEIGHT 60G WHEEL BALANCE 0 -
B110 40326-H1000 WEIGHT 60G WHEEL BALANCE 0 - 2 40326-18000
B110 40327-18000 WEIGHT 70G WHEEL BALANCE 0 -
B110 40327-H1000 WEIGHT 70G WHEEL BALANCE 0 - 2 40327-18000
B110 40328-18000 WEIGHT 80G WHEEL BALANCE (NOT ADOPTED 0 -
B110 40329-18000 WEIGHT 90G WHEEL BALANCE (NOT ADOPTED 0 -
B110 40330-18000 WEIGHT 100G WHEEL BALANCE (NOT ADOPTED 0 -
B110 40360-H1000 CHAIN-TIRE 4 OP COUPE -
B110 43010-H1002 COMP-CASE REAR AXLE 1 SEDAN -1172 2
B110 43010-H1003 COMP-CASE REAR AXLE 1 SEDAN 1272-0573 32 43010-H1002
B110 43010-H1004 COMP-CASE REAR AXLE 1 SEDAN 0673- 5 43010-H1003
B110 43010-H1404 COMP-CASE REAR AXLE 1 COUPE 0673- 5 43010-H1803
B110 43010-H1802 COMP-CASE REAR AXLE 1 COUPE -1172 2
B110 43010-H1803 COMP-CASE REAR AXLE 1 COUPE 1272-0573 32 43010-H1802
B210 43010-H5001 COMP-CASE,REAR AXLE 1 SEDAN -874 4
B210 43010-H5025 COMP-CASE,REAR AXLE 1 SEDAN -874 42 43010-H5001
B210 43010-H5501 COMP-CASE,REAR AXLE 1 COUPE -874 4
B210 43010-H5525 COMP-CASE,REAR AXLE 1 COUPE -874 42 43010-H5501
B210 43010-H7250 COMP-CASE,REAR AXLE 1 SEDAN 0974- 0 43010-H5025
B210 43010-H7350 COMP-CASE,REAR AXLE 1 COUPE 0974- 0 43010-H5525
B310 43010-H8550 CASE COMP-REAR AXLE 1 SEDAN,COUPE,WAGON - 2 43010-H8500
B110 43036-10601 SHIM-REAR AXLE CASE END 0 SEDAN COUPE -
B110 43036-H5000 SHIM-REAR AXLE CASE END 0 SEDAN COUPE 0673-1172 25 43036-10601
B210 43036-H5000 SHIM-REAR AXLE CASE END T=0.075 0 -
B310 43036-H5000 SHIM-REAR AXLE CASE END (T=0.075) 0 -
B310 43036-H5001 SHIM-REAR AXLE CASE END (T=0.15) 0 -
B310 43036-H5002 SHIM-REAR AXLE CASE END (T=0.25) 0 -
B310 43036-H5003 SHIM-REAR AXLE CASE END (T=0.3) 0 -
B110 43059-A1600 PLUG-TAPER SQUARE SOCKET 1 -
B210 43059-A1600 PLUG-TAPER SQUARE SOCKET 1 -
B310 43059-A1600 PLUG-FILLER 1 -
B110 43063-18001 BOLT-FIX REAR BRAKE DISC 8 -
B210 43063-18001 BOLT-FIX REAR BRAKE DISC 8 -
B110 43065-10600 CLIP-BRAKE TUBE 2 -
B110 43066-22500 SEAT-CONNECTOR BRAKE HOSE 1 -
B210 43066-22500 SEAT-CONNECTOR BRAKE HOSE 1 -
B110 43067-H0100 STUD-GEAR CARRIER FIX 8 -
B210 43067-H0100 STUD-GEAR CARRIER 8 -874 4
B310 43070-01L00 SPACER-REAR AXLE BEARING 2 - 2 43070-H5000
B110 43070-04101 SPACER-REAR AXLE BEARING 2 -1172 2
B110 43070-H5000 SPACER-REAR AXLE BEARING 2 1272- 2 43070-04101
B210 43070-H5000 SPACER-REAR AXLE BEARING 2 -
B310 43070-H5000 SPACER-REAR AXLE BEARING 2 -
B210 43096-G0300 CAP-BREATHER 1 -
B310 43096-G0300 CAP-AIR BREATHER 1 -
B110 43206-18000 DRUM-BRAKE 2 -
B210 43206-18000 DRUM-BRAKE 2 -
B310 43206-18000 DRUM-BRAKE 2 -
B110 43215-18000 BEARING-REAR AXLE 2 SEDAN COUPE -
B110 43215-H5000 BEARING-REAR AXLE 2 SEDAN COUPE 0673-1172 25 43215-18000
B210 43215-H5000 BEARING-REAR AXLE 2 -
B310 43215-H5000 BEARING-REAR AXLE 2 -
B110 43236-18000 CATCHER-GREASE LH 1 -1172 2
B110 43236-H5000 CATCHER-GREASE 2 1272- 2 43236-18000
B210 43236-H5000 CATCHER-GREASE 2 -
B110 43237-18000 CATCHER-GREASE RH 1 -1172 2
B110 43239-04100 PACKING-GREASE CATCHER 2 -1172 2
B110 43239-H5000 PACKING-GREASE CATCHER 2 1272- 2 43239-04100
B210 43239-H5000 PACKING-GREASE CATCHER 2 -
B210 43242-H5001 CATCHER-GREASE 2 - 2 43236-H5000
B110 43252-18000 SEAL-OIL REAR AXLE SHAFT 2 -
B110 43252-H1000 SEAL-OIL REAR AXLE SHAFT 2 0372- 2 43252-18000
B210 43252-H1000 SEAL-OIL,REAR AXLE SHAFT 2 -1176 6
B210 43252-H1010 SEAL-OIL,REAR AXLE SHAFT 2 1276- 2 43252-H1000
B310 43252-H1010 OIL SEAL-REAR AXLE SHAFT 2 -
B110 43255-18000 COLLAR-REAR AXLE BEARING 2 -
B110 43255-H1000 COLLAR-REAR AXLE BEARING 2 1271- 2 43255-18000
B210 43255-H1000 COLLAR-BEARING,REAR AXLE SHAFT 2 -
B310 43255-H1000 COLLAR-BEARING,REAR AXLE SHAFT 2 -
B210 44005-U1400 BOLT-FIX REAR BRAKE DISC 8 - 2 43036-18001

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Rear Axle

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