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H190 for my freeway blaster 620

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Gordo View Drop Down
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    Posted: 03 Apr 2016 at 11:06pm
I have a '73 620, and been wanting to install an LSD, and change the rear end ratio to use more of my big cammed L16's rev range.
Had to do something with the rear end anyway, because the former owner had beat the day lights out of the truck, off roading, with no oil in the axle.......
At 40 mph, it howels something terrible.
 
I found a late model Japanese market car with an H190 LSD, and then found an old Gloria (330 chassis) with a 4.625 gear set.
Neither would fit my aluminum carrier, so I chose to use the Gloria iron housing.
The LSD was for a 3.7-ish gear set, so that required a 3mm ring gear spacer.
The Gloria 4.6 gear set had 10mm bolts, the newer LSD has 12mm bolts.
 
So that meant a lot of machine work ahead of me.
And being I will be running the dog nuts out of it, I also wanted a solid pinion spacer.
 
Here is the results:
 
LSD, with 4.625 ring & pinion, and ring gear spacer.
 
H190 3mm ring gear spacer.
 
H190 solid pinion spacer.
 
And last, the ring gear bolt spacers.
Funny, some forum know-it-all once said that all H190s have 10mm bolts.
BULL !!
 
I expect to have to make some 30mm ID pinion shims when I go to do the final set up of the gears.
 
With 25" rear tires, the numbers say that at 7500 rpm, theis gear set, and a late '70s Z-car 71B 5-speed, it will be around 135 mph.
Should be fun Smile
 
Just waiting for some ARP 10mm ring gear bolts to show up about Thursday.
 
So much for unatainable H190 parts.
Can't find them, make them.....
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EzCruiser View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EzCruiser Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2016 at 11:58am
Wow! That's a dream combination! I can't wait to see the video of it in action under the truck! I can never find amazing parts vehicles like you! Keep up the good work!
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Braden620 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2016 at 10:31am
WOW that is very cool.  SO that is an OEM LSD?  I wonder what the breakaway torque is.
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Gordo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gordo Quote  Post ReplyReply Direct Link To This Post Posted: 09 Apr 2016 at 9:43pm
Yup, factory LSD.
I'm guessing that it's tight enough to get me into trouble with a light in the rear mini-truck.
But once it's together, if the 29spline shafts of an R200 engage it, I'll try to get a torque rating in it.


Edited by Gordo - 28 Oct 2016 at 11:58am
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smooth620 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smooth620 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Apr 2016 at 6:33am
Thanks for posting pics of some very rare sought-after H190 parts.
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Gordo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gordo Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2016 at 6:26pm
Well, it's all together.
Dang, I hate setting the gear lash on these, with the diff bearing shims being under the bearings.
Make your best guess on shims, install, and then take it out, pull bearings, change shims, and repeat.
Some diffs, like some Mazda, and Toyotas, and a threaded adjuster, which is supper simple.
Others, like the Nissan R200, and Toyota 8", have the shims on the outside of the bearings, so still pretty eazy.
But once I got into the swing of things, it only took 3 tries to get it shimmed correctly.
 
The pinion spacer had to be machined back a little (like .006") to get the proper bearing preload.
 
Branden620, I don't quite know the correct way to bench test these for initial torque, since it's a 2-way cam-lock LSD.
With no pressure on the ring gear, I could just barely turn the axle shafts by hand, due to the disk pre-load springs.
But as many OEM sedan applications, they had 1 spring disk, 1 outer, 2 inner, and 2 outer disks together to limit torque.
I did as I have done with OEM Cressida LSDs, and changed it to 1 outer, 1 inner, 1 outer, 1 inner, one outer configuration, and remove the spring disk, thus gaining surface area.
So when there is no pressure on the ring gear, it actually turns a little eazier, but then when force is put on the ring gear, everything locks up pretty quickly.
 
If anyone knows the proper way to test these, let me know.
 
Oh, one more thing, due to the 3mm ring gear spacer, I needed longer ring gear bolts.
 
I can probably duplicate the ring gear spacer, but so can any machine shop.
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Gordo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gordo Quote  Post ReplyReply Direct Link To This Post Posted: 21 Apr 2016 at 6:33pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JunkYardDog Quote  Post ReplyReply Direct Link To This Post Posted: 01 Apr 2017 at 10:28pm
How did you figure out what size shim you needed? I am I. The process of do I g this to a r200. Any help is apreciated
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Gordo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gordo Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 2017 at 9:07pm
The net is full of info on the H190, and I had found that telling what spacer would work.
Nismo used to sell the spacers also, and that application info is also floating around.

Something I forgot to tell you in our PMs, is that the H190, and R200 are so close in physical size (the plates in both factory LSDs are even the same), that I bet a 3mm will work just fine in your R200.
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