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The Hitachi H150 differential was fitted to 1975-up Sunny, starting in September 1974. It has a 150mm (5.91 inch) ring gear, so is stronger than the H145 that was fitted to previous models. H150 is strong enough to handle the torque from A14 and A15 engines. Datsun used the H150 for all A14-powered cars.

1 Overview
2 Identification
3 Strength
4 Ratios
5 Swap Into H145 Housing
6 Part Numbers
7 Nissan Competition

Overview

The Hitachi H150 was fitted to B210s and B310s with A14 and A15 engine. It can cope with more torque than the smaller H145.

Ratios from Nissan North America:

B210
1975-1979 4sp and auto: 3.889 
1975-1979 5sp: 3.70

210  PARTS CATALOG
3.889 AUTO, A12 1979-1980
3.700 MANUAL(A14) 1979-1980
3.545 AUTO(CAL),A12 1981-1982
3.545 MANUAL(A14,MPG) 1981-1982
3.700 MAN(A15),AUTO(FED,CAN) 1981-1982
3.545 MANUAL(A15,MPG) 1980

Usage
B310 1979: 3.545 (A14 MPG 4-speed)

Datsun Competition (later Nismo) used to sell various ratios: 3.545, 3.7, 3.9, 4.111.

Identification

For 1980 and newer vehicles, look at the engine compartment build plate. It will list whether you have an H150B (HB) or regular H150.

HA38 - 3.889 ratio 
HB37 - 3.700 ratio

For other years -- and to verify the ratio -- you can count turns of the wheel vs turns of the driveshaft. Even better is to note the stamped numbers on the ring gear.

This unit is stamped 39:11

39 divided by 11 = 3.545 ratio

Flange

H145: scalloped flange, bolt hole rectangle 36 x 50 mm
Post 487206

H150: 45 x 54 mm round or rectangular flange
H165: 45 x 54 mm round or rectangular flange

There are some differences between flanges on H165's, some long (~217.5mm from carrier mounting face to driveshaft flange face), some short (~202.5mm). Depth of hole for centering boss varies also.

H190: 50 x 60 mm, round or rectangular
Post 477495

Size

Measure the gear
Album 25277

H145 measures 145mm
H150 measures 150mm
H165 measures 165mm
H190 measures 190mm

Pre-1980

  B10: H145, 3.900 
 VB10: H145, 4.375 (van/wagon)
  B20: H145, 4.375 S.T.D. / 4.625 Optional (ute/pick-up)
 B110: H145 3.900
VB110: H145 4.111 (van/wagon)
PB110: H165 4.111
 B120: H165 4.111 (ute/truck)
 B210 1974: H145 3.900
 B210 1975-up: H150 3.700 or 3.889
PB210: H165
GB211: H165
 B310: H150 various
  A10: H165 various

1980-up

Axle Codes
H = Hitachi removable gear carrier (pumpkin/centre section)
HA - H145 (145mm diameter ring gear, 5.709 inch)
HB - H150 (150mm diameter ring gear, 5.906 inch)
HC - H165 (165mm diameter ring gear, 6.496 inch)
HD - H190 (190mm diameter ring gear, 7.480 inch) ALUMINUM CARRIER
HE - H190 CAST IRON CARRIER
HF - H190A revised for strength

EXAMPLE: HF38 = H190 with 3.889 ratio was factory fitted

Axle code is on Chassis Identification plate 1980-on, in the engine compartment. Starting in mid-80s, Axle Code is on door-jamb sticker.
Album 21048

Factory LSD has a sticker on the back of the diff housing.

Counting

To verify the ratio in the vehicle matches the original equipment (or build tag), you may count turns of the wheel vs turns of the driveshaft. If slightly less than 4 turns of the driveshaft results in one turn of the wheels, it is a 3.9 ratio. If it takes a bit more than 4 turns, it is a 4.111 ratio.

Even better is to note the stamped numbers on the ring gear. For example, this unit is stamped 39:11
Album 24439

39 divided by 11 = 3.545 ratio
Album 25276

Pinion gear is similarly stamped
Album 25278

Strength

The H150 is good for maybe 125 lb. ft. of torque, enough for any A-series engine. The H145 was rated for less than the torque of an A14, so do not use it with an A14, it is not guaranteed to last.

Ratios

H150 is HA
H150A is HB

3.700

HB37, 3.700:1 ratio

JAPAN  B310 A15
USA B210 MANUAL 0476-
USA B310 A14 MANUAL -0780
USA B310 AUTO CAN,FED 0880-

3.889

HB38, 3.889:1 ratio replaced the H145 3.90. The new ratio with 35/9 teeth allowed for quieter gears than the old 39/10 teeth.

B210 1975-1978
USA B310 A12 AUTO -0780
USA B310 A12 AUTO CAL 0880-
USA B310 AUTO, A12 MANUAL 1279-
JAPAN B310 -7903
USA B310 AUTO -1179
AUS B310 ALL

3.545

HB35 (3.545:1 ratio), highway gear, low torque ratio was only used in USA, mostly in the MPG fuel economy champion B310s.

USA Catalog

CAL AUTO, A12A from Aug 80 [i.e. 1981 model and newer]
MPG MANUAL A15 from Dec 1979 to July 1980 [1980, 1981 model years]
MPG MANUAL A14 from Aug 1980 [1980 model only]

USA Factory Service Manual

1979 not offered
1980 with A15 Manual
1981-1982 with A14 Manual

4.111

HB41 (4.111:1 ratio) with 37/9 teeth was shipped in the Japan market 1976-1977 B210 Twin Carb A14T 5-speed model (H51 model).

Swap Into H145 Housing

The easiest swap is to get the entire rear-axle assembly from a 1975 or newer B210 with A14 (140Y) -- this is the H150 (150mm diameter ring gear). The main spring is 55mm longer, but the others can be used on the 1200. See Bolts right in!

Japan diff

NOTE: The 1974 B210 uses an H145, although the housing is the new stronger design. H145 can be distinguished by studs, whereas H150 uses bolts to fasten the diff to the case.

B210s have a strong axle housing (axles tubes are larger, to 2.2 inch up from 2.0 inch, so U-bolts are different). The B210s use an isolation clamp (the axle tube is rubber mounted), and so the mounting pad is wider. You will need the clamps, u-bolts and shock mounts to do a swap. The housing also user larger ball 72x32x19 bearings (up from 62x32x16) with both inside and outside seals. The B110 only had one seal.

Because the H150 is longer, the driveshaft is shortened by 7mm. The housing face is 2mm toward front of car (diff gear is 5mm larger)

Datsun Competition (later Nismo) used to sell various ratios: 3.545, 3.7, 3.9, 4.111 for the H150.

Whilst NISMO produced H150 LSDs (Limited-Slip Differential), Axles baffles and Oil Coolers were not available from Nissan for the H150.

Good for maybe 125 lb. ft. of torque

You can also just put the H150 gear assembly in the stock H145 axle housing. You just need a 2mm spacer:

Pitroad Spacer
Use a B310 propeller shaft with H150 diff in B110.

Part Numbers

38300-H5000 FINAL DRIVE ASS'Y HB38 (35/9=3.889) 
38300-H7000 FINAL DRIVE ASSY HB37 (37/10=3.700) 
38300-H9000 FINAL DRIVE ASSY HB35 (37:11=3.545)

1 CARRIER COMP-gear
 38310-H8500 CARRIER-GEAR HB38 7904-
  superceded 38310-H5000 CARRIER COMP-gear HB38 
 38310-H9000 HB37 1279- USA replaced 38310-H9500 
 38310-H9500 CARRIER-GEAR HB37 1279-
  replaced 38310-H7000 COMP-CARRIER,GEAR HB37
2 08915-14010 WASHER-lock fixing diff bearing cap (4 needed)
3 38315-H7000 BOLT 7906-
  superceded 38315-G0400 BOLT-cap fixing diff bearing cap (4) -7905
4 38100-H5000 GEAR SET-hypoid (HB38 35/9=3.8889) 
 38100-H7000 GEAR SET-hypoid (HB37 37/10=3.700) 
 38100-H9000 GEAR SET-hypoid (HB35 39/11=3.545)  
5 38102-G0300 BOLT-drive gear (8)
6 38103-G0400 STRAP-lock bolt (4)
7 38421-H8500 CASE-DIFF 7909-
   superceded 38421-H5000 CASE-diff -7908
8 38423-H8500 GEAR-side diff bevel (2) 7906-
  superceded 38423-H5000 GEAR-side diff bevel (2) -7905
9 38425-G0300 PINION-mate diff bevel (2)
10 SELECT (2)
 38424-H5000 WASHER-thrust side gear (t=0.76-0.81)
 38424-H5001 WASHER-thrust side gear (t=0.81-0.86)
 38424-H5002 WASHER-thrust side gear (t=0.86-0.91)
11 38426-18000 WASHER-thrust pinion mate (2)
12 38427-18000 SHAFT-pinion mate
13 38428-G0400 PIN-lock pinion shaft B210
 38428-U1500 PIN-lock pinion shaft B310
14 38440-H1000 BEARING ASS'Y-diff side (2)
15 as required
 38453-H1000 SHIM-adjusting side bearing (t=0.05)
 38454-H1000 SHIM-adjusting side bearing (t=0.07)
 38455-H1000 SHIM-adjusting side bearing (t=0.10)
 38456-H1000 SHIM-adjusting side bearing (t=0.20)
 38457-H1000 SHIM-adjusting side bearing (t=0.50)
16 38120-18000 BEARING ASS'Y-drive pinion, rear
17 38140-04100 BEARING ASS'Y-drive pinion, front
18 38165-N5000 SPACER-drive pinion (pinion bearing)
19 as required (1)
 38154-G0400 WASHER-adjusting drive pinion (t=2.74)
 38154-G0401 WASHER-adjusting drive pinion (t=2.77)
 38154-G0402 WASHER-adjusting drive pinion (t=2.80)
 38154-G0403 WASHER-adjusting drive pinion (t=2.83)
 38154-G0404 WASHER-adjusting drive pinion (t=2.86)
 38154-G0405 WASHER-adjusting drive pinion (t=2.89)
 38154-G0406 WASHER-adjusting drive pinion (t=2.92)
 38154-G0407 WASHER-adjusting drive pinion (t=2.95)
 38154-G0408 WASHER-adjusting drive pinion (t=2.98)
 38154-G0409 WASHER-adjusting drive pinion (t=3.01)
 38154-G0410 WASHER-adjusting drive pinion (t=3.04)
 38154-G0411 WASHER-adjusting drive pinion (t=3.07)
 38154-G0412 WASHER-adjusting drive pinion (t=3.10)
 38154-G0413 WASHER-adjusting drive pinion (t=3.13)
 38154-G0414 WASHER-adjusting drive pinion (t=3.16)
 38154-G0415 WASHER-adjusting drive pinion (t=3.19)
 38154-G0416 WASHER-adjusting drive pinion (t=3.22)
 38154-G0417 WASHER-adjusting drive pinion (t=3.25)
20 38189-A6100 SEAL-oil front (oil drive pinion)
21 38210-H5000 FLANGE ASS'Y-comp pinion B210
 38210-H5003 FLANGE ASS'Y-COMPANION B310
22 38216-U3000 NUT-drive pinion 7805-
  superceded 38216-U1500 NUT-drive pinion -7804
23 38320-H5000 GASKET-gear carrier
24 38321-H5000 BOLT (8)

Nissan Competition

From the 1984 Nissan Competition Catalog

H150 RING & PINION SETS (FROM 9/74)
- 38100-H9000 3.545 R&P SET
- 38100-H7000 3.700 R&P SET
- 38100-H5000 3.900 R&P SET
- 38100-H5100 4.111 R&P SET

The H150 3rd members will fit the B210 (from 8/74) and 210 and do not include limited-slip units
- 38300-H9000 3.545 3RD MEMBER
- 38300-H7000 3.700 3RD MEMBER
- 38300-H5000 3.900 3RD MEMBER
- 38300-H5100 4.111 3RD MEMBER

The factory does not produce axles baffles or limited-slip units for the H150 differentials.

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H150

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