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Discussion Starter · #1 ·
Well I am about to begin to make many many many questions regarding the installation of the LSD differential I got from a 300ZXT '88, got it for $300 which I think it is fair enough.
The first thing I did when I got it home is putting the axles and turning it too see the other axle turning the same direction (GREAT!)
I would like to have my Z up and running next sat (hopefully)

I compared the lenght of the casing to the original R200 and I think they have the same lenght.

Questions:
1) Can I use the whole differential or should I swap the guts of the LSD into my 280 R200 case?

2) If not, maybe I can use the finned cover?

3) which lubricant to use? synth right?

4) As some of you already know I am the proud and hurt owner of a set of BFG's drag radials and they grip too much, I am thinking on running with my tires inflated to 32 psi but as I posted before, will the LSD break faster than the regular? (because both tires have grip)?

5) If not, is the driveshaft the next weak link or the BW tranny?

6) I've heard that some people change the unions in their driveshafts, which ones should I use? or is it a big job?

7) Have someone welded the nuts to the differential to be able to release it w/o having to put a wrench in that very difficult place? ( to be able to release the diff only by (after removing the axles and driveshaft) removin the 4 bolts in the X-member and the support?

Any other info anyone can provide regarding this matter would be GREATLY appreciated.

Thanks in advance
 

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> I compared the lenght of the casing to the
> original R200 and I think they have the same
> lenght.

Beyond the difference in the finned cover, the size should be the same.

> Questions:
> 1) Can I use the whole differential or
> should I swap the guts of the LSD into my
> 280 R200 case?

you can use the whole diff. If I remember right, you have the turbo already, so you should have cv joints. if you do, this should be a bolt in procedure.

> 2) If not, maybe I can use the finned cover?

I don't know how close the clearance is on the zx, but you can't use it in the early Z's,(70-78), without some mods. if there is space behind the diff, yes, you can use it, as long as the mounting will line up. if not, use the cover from your old diff.

> 3) which lubricant to use? synth right?

YES! high temps in the lsd make it almost a requirement. you need to also look into the friction modifiers required for lsd's. check with your local nissan dealer, or local nissan expert.

> 4) As some of you already know I am the
> proud and hurt owner of a set of BFG's drag
> radials and they grip too much,

now that is not something i have heard before. we in the z and zx's tend to NOT have enough, vice your excess problem. you will launch harder with the lsd, because both tires will be grabbing vs just one before. you will launch harder, and i don't think it will be a problem, drive it and see first.

> 5) If not, is the driveshaft the next weak
> link or the BW tranny?

the next weak link is likely the u-joints in the driveshaft, but it is rare to hear of them failing. it is usually u-joints in the halfshafts that fail under high power. since you have cv joints, i don't think you will have probs. for good measure, i would replace the driveline u-joints. just a saftey thing.

> 6) I've heard that some people change the
> unions in their driveshafts, which ones
> should I use? or is it a big job?

are you talking about the flange on the front of the diff? if so, that talk was for us z owners who are running a driveline that was originally for a r180 diff. since you originally had a r200, you should be fine.

-bob hanvey
 

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Re: AT LAST I GOT MY LSD!! (easy change)

The diff case is the same/identical, just have to swap the rear cover and it's then identical EXCEPT for the 300ZX front driveshaft flange which you can either leave and have your driveshaft changed or just swap your other R200 front flange on in place of the 300 flange (they are different, or mine from an '88 was).

As well use synthetic (75W90 or similar, I use it in any R200's) and one bottle of GM posi additive. Nissan dealers here told me they use chrysler or GM (no Nissan brand , or so I was told).

While getting your additive, buy a 2nd bottle for whenever you just might drain it etc and you can always get a GM discount for being a 'camaro club member';^)

enjoy, PS you might want to check your breakaway to make sure it's adequate or have it reshimmed or clutches added before it's installed and a big hassle. OEM is 40ft/lbs AIR. The lower the better for street/wet/dry IMO but for drag I'm not sure.

halfshafts are simple as any old R200 halfshafts still work same as before....
 

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Re: AT LAST I GOT MY LSD!! (easy change)

The diff case is the same/identical, just have to swap the rear cover and it's then identical EXCEPT for the 300ZX front driveshaft flange which you can either leave and have your driveshaft changed or just swap your other R200 front flange on in place of the 300 flange (they are different, or mine from an '88 was).

As well use synthetic (75W90 or similar, I use it in any R200's) and one bottle of GM posi additive. Nissan dealers here told me they use chrysler or GM (no Nissan brand , or so I was told).

While getting your additive, buy a 2nd bottle for whenever you just might drain it etc and you can always get a GM discount for being a 'camaro club member';^)

enjoy, PS you might want to check your breakaway to make sure it's adequate or have it reshimmed or clutches added before it's installed and a big hassle. OEM is 40ft/lbs AIR. The lower the better for street/wet/dry IMO but for drag I'm not sure.

halfshafts are simple as any old R200 halfshafts still work same as before....
 
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