H145

From Datsun 1200 Club

Datsun 1200 cars (sedan/coupe/wagon) use an H145 differential in the Rear Axle Assembly. The B120 Datsun 1200 pickup uses the larger H165 diff.

ID

H145 has 8-stud removable center. H150 and H165 also use 8 bolts. But only the H145 is 8-stud (the others use bolts).

NOTE: Aussie-built B110 sedans with a non-removable diff center use the BW60 diff.

Differential

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

Differential Repair

Replacing diff bearings or spider gears? Or Ring & Pinion (CWP)? The procedure for re-assembly of the differential gear carrier is very complicated. Be sure to get the factory service manual.
#FSM

We recommend: Just swap the whole center section "pumpkin" from a 1970-1973 B110 or 1974 B210 into the housing. It will be cheaper and certainly easier, someone has one for free. The center section rarely goes bad unless the diff runs low on oil, so your chances are very high of getting a good used one.
Album 16206

Yes, B110 and 1974 B210 center section is identical. You could also swap a 1975-1978 pumpkin, using a 2mm spacer between the pumpkin and the housing, or use three gaskets.

When buying a used center section, check the play in the pinion:

Backlash between ring gear and drive pinion
H145: 0.10 to 0.15 mm
R160: 0.1 to 0.2 mm
H165: 0.13 to 0.18 mm
H190: 0.15 to 0.20 mm

Gear Sets

B110 3.90 Datsun 1200 1970-1973 Sedan & Coupe
B110 4.11 Van (wagon)
B120 - see H165

B10 4.111 Datsun 1000 1967-1970 37:9
B10 4.375 van (VB10) with alloy carrier 35:8
B20 4.625 truck (ute) 37:8

B210 3.90 -7409 (North America & Japan) [39:10]
B210 7409- see H150

Datsun Competition (later Nismo) used to sell every factory H145 ratio: 3.9, 4.111, 4.375, 4.625. See #Nissan Competition section below.

5.14 ratio gear set (source unknown) 36/7 = 5.14
Post 498967

145mm ring gear diameter
Post 498965 Post 498965

pinion installation marks: set number 'G8608' and head number '-5' (varies for each pinion)
Post 498965 Post 498965

Ring Gear (crown wheel) marks '39-10 CN 47 5' 39/10 = 3.90 ratio
Post 498965

mark '39-10 BX4.5 8'
Post 498965

Post 498966

Pinion is marked to match the ring gear. This one is '37 . 9' (37/9=4.111)
Post 498966

Gear Carrier

H145A features a cast iron gear carrier. The original H145 was the #Alloy Gear Carrier used by the B110 Datsun 1000.

Post 498965 Post 498965

This carrier has been fitted for a Differential Oil Cooler
Post 498966 Post 498966

Post 498966

Alloy Gear Carrier

The alloy carrier is weaker (less able to handle the torque) but is lighter so giving a superior ride over the normal cast iron carrier.

B10 4.111 sedan & coupe
B10 4.375 van
B20 4.625 truck 

Post 487200

Using in H150 Housing

Say you have a race-prepped H145 diff center ... can you use it in the H150 housing of your B210 or B310? Yes. I imagine this procedure was created because of the success of the B110 in racing leading to a ready supply of TS-class racing parts.

• mill the H150 housing flange to remove 2mm
• use a B110 driveshaft, so that the length and flange matches

[from centerline of side bearing to the carrier flange]
 35 ±0.05
(33 ±0.05)

2mm shaved from flange of gear carrier (step is 6mm)
Album 30386

B310 rear axle

Flange

Pinion bolt-on companion flange for the Propeller Shaft
Post 498966

Parts

Album 22378

Suppliers - USA

• Nissan
• RockAuto differential parts

38424-18002 WASHER-THRUST SIDE GEAR T=0.86 MM
Album 26305

Ring & Pinion

JDM B10 Datsun 1000 H145 gear sets (will fit all Datsun 1200)
38100-18000 SET-GEAR, hypoid with pinion (37 T: 9 T) [4.11] Sedan & Coupe
38100-H0700 SET-GEAR, hypoid with pinion (35 T: 8 T) [4.375] Van
* superceded 38100-18100 
38100-15400 SET-GEAR, hypoid with pinion (37 T: 8 T) [4.625] Truck
38100-G0400 SET-GEAR, hypoid with pinion (37 T: 8 T) [4.625] Truck (from '69-Nov)

Datsun 1200 gear sets
38100-H1000 3.900 R&P SET Sedan & Coupe
38100-H1100 4.111 R&P SET Van

Differential

Differential Side Bearing

O.D: 62mm

38440-H1000 ASSY-BEARING DIFF SIDE (2 needed)
* replaces 38440-18000 ASSY-BEARING DIFF SIDE
* SKF BR30206 $22 USD

SKF BR30206 specifications
Tapered Bearing Cup & Cone Set 
* I. D. 30mm     (1.181")
* O. D. 62mm     (2.441")
* Width 17.25 mm (0.679")

* HGM Liftparts, $9.36
* NSK HR30206J
* KOYO 30206JR
* NTN 30206

Nachi E30206J

* SKF BR30206 $16.99
* National Bearing 30206
* BCA 30206 $29.99
* Motor City S30206 $9.88
* TIMKEN Part # 30206M  $14.96
* BCA/NATIONAL Part # 30206  $16.74

30206

Application: 
Alfa
Mitsubishi
Ford
Mazda
Nissan
Plymouth
Porsche
Subaru

Pinion Crush Sleeve

The Pinion gear bearing spacer (crush sleeve) is NLA. See the main article for alternatives.

Post 498966

Pinion Seal

B110, through 1974 model year B210 (H145). Probably fits B10 as well.

38189-18000 SEAL-OIL DRIVE PINION
SKF Oil Seal #550219 $22.99

Pinion Bearing

Rear

Rear pinion bearing
Post 498966

38120-18000 ASSY-BEARING DRIVE PINION REAR
* SKF BR32206
* NSK HR 32206C 62x30x21.25mm

SKF BR32206 specifications
Tapered Bearing Cup & Cone Set 
* I. D. 30mm     (1.181")
* O. D. 62mm     (2.441")
* Width 21.26 mm (0.837")

Fits many cars, GM, Nissan, Isuzu, Mazda, Opel, etc.

Rockauto
* BCA/NATIONAL Part # 32206 $19.84
* SKF BR32206 $18.99

Front

38140-18000 ASSY-BEARING DRIVE PINION FRONT
* Koyo 303/22X
* NSK HR303/22CNF

NSK HR303/22CNF specifications
Radial Taper Roller Bearing
* I. D. 22 mm (0.866")
* O. D. 56 mm (2.205")
* Width 17 mm (0.669")

Timken HM88649H

Shims

Also need these:

* 38165-H1001 SPACER-DRIVE PINION BEARING $17.00
* 38154-G04xx WASHER-ADJUSTING DRIVE PINION $3.83 USD
Where xx = 00 through 17 for different thicknesses
* 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

38154-G0410 | 38154-G0403

Nissan Competition

From the 1984 Nissan Competition Catalog

H145A RING & PINION SET (TO 8/74)
* 38100-H1000 3.900 R&P SET
* 38100-H1100 4.111 R&P SET
* 38100-H0700 4.375 R&P SET
* 38100-G0400 4.625 R&P SET

H145A LIMITED-SLIP ASSY (TO 8/74)

H145A DIFFERENTIAL ASSY
The H145A 3rd members will fit the 1200 and B210 (to 8/74) 
and do not include limited slip units.
* 38300-H1000 3.900 3RD MEMBER
* 38300-H1100 4.111 3RD MEMBER
* 38300-H0700 4.375 3RD MEMBER
* 38300-G0500 4.625 3RD MEMBER

H145A AXLE BAFFLES

Differential Oil Cooler Assy

Damage

H145 damaged when being used by a potent A12 engine: ^POST Chris's Rip Snorter A12 & Red B10
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