Nissan H233 and H190 information for swaps.
The H233 (233mm) is a popular axle used on the front and rear of numerous Nissans around the world. In the US market Nissans It was only available on the rear axles. The H233 is based on the popular H190. Used on Roadsters, some cars and most 2wd trucks, 620s, 720s, D21s, D22s etc. Since its a removable third member its easy to work on. The other common rear axle is the C200. The C200 does not have a removal center. It uses the same gear set as the R200 found in the front of 4wds trucks. Not the same as the R200 in Z cars. The C200 is also used as a front solid axle in the patrol around the world.
H233 was available with 31 and 33 spline axles. All 6 lug. 6 x 5.5 for 2wd and 4wd. There is two bolt patterns on the pumpkin. 9 bolt 89 down and 11 bolts 90+. You can remove two studs to use the 9 in the 11 housing and vice versa. Some of the bolts do not line up the same.
Gear ratios available are:
The ratio tags are on the B pillar on trucks and doors on pathfinders. The axe code for the H233 is HG. And the gear ratio will be the first two numbers from above. For example HG49 would be a h233 4.9 axle. A HA37 would be a H190 3.7 axle.
Different WMS versions are available over the years. At least two WMS were used. About a 3" difference between the 2.
There was a full floating 1 ton version on D21 duallys. This is the 1 Ton Dually D21 that was only available cab chassis or long bed (7'). It was only offered regular cab, V6, Auto with column shifters. I drove a few when I worked at a few Nissan dealers back in the 1989-90.
H190 was used in the 72-79 620s (4.3 manual- 4.6 autos). I used to put these in my 85 720s. Simple way to gear down.
A great swap for the 86.5-97 D21 and 87-95 WD21 is install a 4.9 diff from a 2000+ W/D22. Just swap carriers you can use the new housing in the 90+.
In this example I put a 4.9s in a 94 Pathfinder.
I am putting this 04 WD22 diff in a 94 WD21. So I need to swap the carriers. 04 is 33spline, 94 is 31spline. Also I want to swap the companion flange. You want to make sure you get the correct gear set. The ring gear is stamped 49:10. This is 49 Ring teeth divided by 10 pinion and that is called 4.9. Axle code HG49 on the B pillar or door sticker. Make sure the junk yard ships the right one.
This is a rare 10/04+ 2004 WD22 Xterra Diff. Its rare because it has a strap yoke. In 2005 the Xterra went to a spicer style axle. Almost all Nissans from mids 80s use 1310 spicer U joints. Either inside clip or outside clip.
I had to make jig to hold the flange so I could get the nut loose. My air gun would not budge the 30mm nut. Never had this issue with the normal flange.
This is the ABS sensor tone ring. The newer H233s have tone rings on the axle shafts or the pinion flange.
The far right flange is a Dana 44 All three use 1310 U joints.
This is a H233 diff jig I made from an old rusty axle housing I picked up. Used the other half for a bearing press.
Here is the basic steps to swap carriers.
Rear axles in US market vehicles:
1989- have 9 housing bolts and 1990+ have 11 housing bolts
D21 V6 from 6/86 up to 8/89
WD21 V6 from 6/86 up to 8/89
The H233 is still used today around the world in non US vehicles like the patrol and d22.