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Datsun 1200 cars (sedan/coupe/wagon) use an H145 differential in the Rear Axle Assembly.
Contents |
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
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
Size
Measure the gear
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.
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
39 divided by 11 = 3.545 ratio
Pinion gear is similarly stamped
Differential Repair
Replacing diff bearings or spider gears? Or ring & pinion? The procedure for re-assembly the differential gear carrier is very complicated. Be sure to get the factory service manual.
We recommend: Just swap the whole center section "pumpkin" from a 1971-1973 B110 or 1974 B210 in there. 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 of getting a good used one are high.
Yes, B110 and 1974 B210 center section is identical. You could also swap a 1975-1978 pumpkin they say you need a 2mm spacer between the pumpkin and the housing.
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.
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 4.375 van (VB10) with alloy carrier 35:8 B110 4.111 van (VB110) with aluminum gear case
B10 Datsun 1000 H145 alloy carrier 38310-18000 COMP.-CARRIER, gear ALL * 38315-18000 STUD (fixing differential bearing cap) 4 ALL * 38317-18000 WASHER (fixing differential bearing cap) 4 ALL * 38318-18000 NUT (fixing differential bearing cap) 4 ALL
click for more photos
Parts
Suppliers - USA
38424-18002 WASHER-THRUST SIDE GEAR T=0.86 MM
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 * ebatmus.com $13 and up * NSK HR30206J * KOYO 30206JR * NTN 30206
Nachi E30206J
Schuck's * SKF BR30206 O'Reillys/Schucks/Grand/Kragen $16.99 * National Bearing 30206 * BCA 30206 - $29.99 * Motor City S30206 - $9.88 RockAuto.com * TIMKEN Part # 30206M - $14.96 * BCA/NATIONAL Part # 30206 - $16.74
30206
Application: Alfa Mitsubishi Ford Mazda Nissan Plymouth Porsche Subaru details
Pinion Seal
B110, through 1974 model year B210 (H145). Probably fits B10 as well.
38189-18000 SEAL-OIL DRIVE PINION SKF Oil Seal #550219 Partsamerica.com $22.99.jpg)
Pinion Bearing
Rear
38120-18000 ASSY-BEARING DRIVE PINION REAR * SKF BR32206
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 Partsamerica * 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
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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
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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
