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Step by Step - Installing an LSD into your open diff


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#1 JMortensen

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Posted 11 March 2007 - 04:09 PM

1. Remove diff (If you can't figure this one out, take your car to a shop and pay them to do the whole thing for you)
2. Remove cover
3. Mark left and right caps and also note top and bottom
4. Check backlash
5. Remove bearing caps
6. Remove carrier and ring gear
7. Keep left and right side carrier shims straight (I zip tied one side together, there were only 3 in my diff)
8. Remove ring gear bolts and ring gear from carrier.
9. Press new bearings onto new carrier
10. Loctite ring gear bolts and install ring gear onto LSD (this is where you would use the ring gear bolt spacers if you made them). Torque to 43-51 lb/ft for 10mm ring gear bolts, 65-72 lb/ft for 12mm ring gear bolts
11. Reinstall carrier into housing with shims.
12. Reinstall main caps on the correct side and rightside up. Torque spec is again 65-72 lb/ft
13. Verify that backlash didn't change
14. Reinstall cover
15. Reinstall diff
16. Add fluid
17. Accelerate out of corners like you never could in your Z before... :D

It's been my experience that the backlash doesn't change notably. It changed .0005" on my own diff, and I've never come across any posts from someone whose backlash needed to be readjusted after installing the LSD.

If the backlash did change more than .002 or so, then you just move the carrier to the left or right by adding shims on one side and taking away the same amount on the other side until the backlash is back to where you started. The shims could be ordered from Nissan, or you could take a trip to your local gear shop and see if they have anything close that would work.

Pattern won't change substantially because the pinion depth isn't changing. Setting pinion depth is hard to do. Everything else in a diff is pretty easy. This means that installing your LSD is easy.

Here is a link to a .pdf with a lot more info about other procedures involved in differential repairs. It shows pictures of measuring backlash, and has generic instructions for all of the gear installation procedures (pinion depth, pinion bearing preload, backlash, carrier bearing preload).
http://www.ringpinio...llation_Kit.pdf

Jon Mortensen, owner/operator www.petdoorstore.com


#2 vashonz

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Posted 11 March 2007 - 04:53 PM

Any recomendations on which fluid to run?

I've heard GL-5 is can be bad for diffs that have brass parts inside them.

I'm also confused on the different additives people use, I know viscous diffs need a certain one, but certain additives cause a clutch type diff to slip.
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#3 JMortensen

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Posted 11 March 2007 - 09:53 PM

I use SWEPCO 201 in my LSD, but before I found out about it I was running your typical auto parts store lube and an LSD additive. Additives are all the same, regardless of whether they're called "Friction Modifier" or "LSD Additive" or whether they say they're for Ford, GM, or Chrysler. VLSD's should require regular gear oil, but will require a different type of fluid inside the LSD, but that LSD works on an entirely different system and the VLSD fluid wouldn't be what you'd want to add to your CLSD gear oil.

Jon Mortensen, owner/operator www.petdoorstore.com


#4 Danno74Z

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Posted 12 March 2007 - 06:37 AM

jmortensen

7. Keep left and right side carrier shims straight (I zip tied one side together, there were only 3 in my diff)

I'm assuming you had 3 shims on the left side and 3 on the right? Is that correct or 1 and 2? By chance did you measure the original shims? You mentioned the shims could be ordered through Nissan - is that a fact?

Thanks,
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#5 JMortensen

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Posted 12 March 2007 - 11:24 AM

It was actually only 3 shims. I think the right side had one thick one, and the left side had one thin and one thick. I was reading the FSM and they said that the shims were available. I haven't tried to order them, but they were at least at one point available. It's just a placeholder, so a closely sized shim from a GM or Ford should be fine too.

Jon Mortensen, owner/operator www.petdoorstore.com


#6 johnc

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Posted 12 March 2007 - 03:38 PM

I've had good luck lately with Motul 90PA gear lube in the Nismo R-Tune 1.5 way LSD in my 350Z. I also added 6 oz. of Torco friction modifier. These Nismo diffs are notorious chatterers and this fluid combination calmed it down enough so that my wife is not afraid to ride in the car.
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#7 FJ 280z

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Posted 12 March 2007 - 04:34 PM

not to sound like an idiot or anything, but is this for installing like a brute power LSD, or a quife LSD into the nissan r200 rear end, or a OEM nissan LSD. i have a LSD out of a q45, will that go into the open R200 in my 280z or am i comparing apples and oranges?

#8 JMortensen

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Posted 12 March 2007 - 04:47 PM

This FAQ deals with installing a "regular" LSD into a longnose R200. There is some amount of crossover possible. For instance you can use the shortnose R200 KAAZ LSD in the longnose provided you get the diff that replaces the OPEN carrier and not the VLSD replacement.

The Q45 LSD's I'm not real sure about. There has been some confusion over how many splines the VLSD that comes in that diff have. I think some had 29 splines and others 30 splines. There were also some that had 13mm ring gear bolts instead of the usual 10 or 12 mm bolts. You'll have to do some research or maybe just open it up and see if everything swaps over.

Jon Mortensen, owner/operator www.petdoorstore.com


#9 MONZTER

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Posted 12 March 2007 - 08:36 PM

Have any of you guys ever tried installing and then removing for adjustment a Quaife LDS into a R-180.

The LSD wont fit in with the bearings pressed on. You have to do it through the holes, Now try to remove it.

What a nightmare

#10 mtcookson

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Posted 13 March 2007 - 02:51 PM

I know for sure the 90-93 Q45 R200V has 30 splines, just counted. ;)
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#11 Just Jim

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Posted 13 March 2007 - 08:13 PM

Can 10MM bolts be used on a 12MM CLSD without spacers?
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#12 JMortensen

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Posted 14 March 2007 - 10:38 AM

Can 10MM bolts be used on a 12MM CLSD without spacers?

Yes. Some figure spacers to be a good idea, but people have run this diff without the spacers without having any problems.

Jon Mortensen, owner/operator www.petdoorstore.com


#13 midnightmoonlight

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Posted 18 March 2007 - 04:11 AM

So you are running just the swepco 201 and no additive? That stuff looks good now I just have to locate it.
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#14 JMortensen

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Posted 18 March 2007 - 02:05 PM

You can use swepco without an LSD additive. If your LSD starts to chatter you can always add the additive later, but you shouldn't need it to start with.

Jon Mortensen, owner/operator www.petdoorstore.com


#15 Cable

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Posted 29 August 2009 - 05:02 AM

i have a LSD out of a q45, will that go into the open R200 in my 280z or am i comparing apples and oranges?


Does anyone have any updates to this question?

Thanks!!
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