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decided to write another seller on ebay since the response i got from the first guy was pretty vague.. here is what he had to say;

Our first version of this LSD would only fit the Japanese axles because they used a different axle stub. What you read on that forum probably referred to this issue.

We have since redeveloped this LSD to fit the USDM axle splines. As long as your car was made for the US market it will fit just fine. Sorry for any scary reading you may have come across.

- tuna-tom
 

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A Happy Dad
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decided to write another seller on ebay since the response i got from the first guy was pretty vague.. here is what he had to say;

Our first version of this LSD would only fit the Japanese axles because they used a different axle stub. What you read on that forum probably referred to this issue.

We have since redeveloped this LSD to fit the USDM axle splines. As long as your car was made for the US market it will fit just fine. Sorry for any scary reading you may have come across.

- tuna-tom
that doesn't sound right, different axle stub in JDM?
 

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Supras are never 'done'
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The torsen uses different stubs.

The guys that tested the original one tried both sets though and neither fit.
 

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Here is the response I received from OBX reguarding the problems found with the original lsd tested here:

>problem 1. The thickness of the ring gear flange is approximately .250" thicker than the stock flange. This is an issue due to the fact you have less thread engagement for the ring gear bolts.

>solution 1. i believe we machined out grooves for the crowngear bolts that resolve this issue. (fyi, regardless, the bolts should be reverse threaded i think so there is no way for it to back out if the car is moving forward...)

> problem 2. The carrier shim combination is WAYYYYYY off. It does not even come close to setting up with stock shims. We ended up using about .275" on the right side and .060" on the left side. Would work but is really hoaky.

> solution 2. if there was a shimming problem, he needed to contact OBX for resolution. OBX LSDs are measured out and should be fine to use with OEM replacement shims which can be ordered from Toyota. If it is out of spec of what Toyota offers for replacement shims, OBX would look into it. Sometimes when people open the differentials and start swapping out the washers, the housings are not straight / withing OBX / OEM specs anymore.

> problem 3. The major problem is the fact that the stub axles bottom out on the splines before the snap ring engages into the side gear, thus the axle slides in and out by hand.

> solution 3. again, if you mess around with the washers it will not lock into place for the snap ring, these have been assembled and tested by OBX. if there are issues, OBX will look into it.

> Problem noted with the Japanese axles not fitting original obx design:
JZA70 stub shafts which are longer.The stub axles do engage into the snap ring grooves but the seal surfaces stick out too far and do not allow the seal to ride on the stub shaft.

> New design OBX lsd, if used with OEM US spec stubs, fitment is fine.


I hope this information helps.

- tuna-tom
 

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please don't support a company who's motto is "shit is good"


(see, I'm not joking)
Generally I'm not one to support knockoff companies but I am seriously on a budget with my Supra as it's my "for fun" car.

What other cheap differential options do I have other than OBX?

How is it to rebuild one? Maybe I should just look for a lower-mileage stock one to replace mine with?
 

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I've never had any problems with the stock differential. What problems are you experiencing?

The TSRM explains how to rebuild the diff - From what I've heard it is not overly difficult. I had mine rebuilt by a shop due to time constraints, but that was rather costly.

A dial indicator, vernier caliper, and torque wrench (as well as necessary replacement parts) is all you should need.
 

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It'd be great if this diff worked so we could have a cheapish helical diff for our cars.

The ones they made for the Honda seem to work fine for almost everyone who gets one. They just had to open the diff up and redo how the inside washers were oriented.

I've asked the seller if there was a fitment problem if we could return it and he said yes as long as it hadn't been damaged.
 

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I've never had any problems with the stock differential. What problems are you experiencing?
I'm getting a clicking noise sometimes when I on/off gas or clutch-in.

You can rule the center bearing out because I just replaced my driveshaft with a 1 piece steel one.

I'm also getting vibrations at 70mph+ and it feels like it's coming from the rear-end.
 

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I'm getting a clicking noise sometimes when I on/off gas or clutch-in.

You can rule the center bearing out because I just replaced my driveshaft with a 1 piece steel one.

I'm also getting vibrations at 70mph+ and it feels like it's coming from the rear-end.
My money's on that being your problem not the OEM diff. I can't tell you how many times I've seen single-piece DS's cause vibrations and other NVH issues on MK3's.
 

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My money's on that being your problem not the OEM diff. I can't tell you how many times I've seen single-piece DS's cause vibrations and other NVH issues on MK3's.
I had vibrations before I put my driveshaft in. It was the main reason why I got a 1 piece, because it costs only a little bit more to put in than an new OEM center bearing.
 

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Obx lsd v2

The OBX LSD V2 that you can get on ebay is in fact the version 2 with all the fitment issues taken care of. For $200 I would get one for my cressida.. that is if i had the money.
 

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I guess you still haven't put one in yourself to verify the fitment issue.
 

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[email protected]
to me
10/6/09


Our original shipment of this item was designed to fit only JDM vehicles that used a special Japan-only axle stub. We have since redeveloped this unit to fit the USDM spline pattern found on US axles. This unit should fit any supra of that generation that was originally sold in the US.

OBX racing sports
 

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My rear end is making noise and has plenty of slop. It needs to be replaced asap. I will have to buy one tonight.

Edit. I bought a 88 low mileage differential to install for my daily driver. I will have to buy the obx after I pull my whining one out.

I have to get this drive train all sorted out before I turn up the boost. Tranny is also going to need to be rebuilt. Then I will buy injectors and the turbo upgrade
 

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Probably going to bite the bullet and get one here soon for my mx83 cressida. I dont want to get a used ma70 clutch diff since I will have to probably rebuild it for it to be any good and maintenance on it will be more than the OBX helical lsd. only other option would be a welded diff but that would suck for daily driving, which is what my car will be for. and for $220 shipped I cant complain.
 
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