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Thread: Interchangable LSD

  1. #1

    Interchangable LSD

    Read a few loose forum on web about the a543 and neon/ 523 lsd are they interchangeable? Would rather find the info on you guysxwhove done!. Which one is the better obx/ quafe / chrysler? Srt any better than stock?
    Thank lovely folk!

  2. #2
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Interchangable LSD

    The SRT unit requires a lot of modification to make it work in the 523/568 units. I think only one person has done that, and he's a machinist.

    The Quafe is a much nicer unit than the OBX, but when they were available, the OBX was only about 20% as much cost wise.

    I'm not positive that the 543 shares the diff with the 4 cyl transmissions, but I know the gears are the same, so I'm thinking someone will be along to confirm that soon.

  3. #3
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: Interchangable LSD

    All of the aftermarket "neon" LSD units are made for the T350 transmission which by convenience uses the same (by external dimensions) differential carrier assembly as our transmissions (555/568/525 aside) with a few differences (the speedometer gear being the primary one). The 523 and 543 are identical internally, the bell-housing is the only difference.

    Modern performance has their own (presumably Chinese made as well) OBX copy as of current. It does cost more(about 2.5x) than the original cheapo plain white box special that OBX was well known for but they fixed all the Q/C issues that the original OBX units were infamously known to have.

    The Quaife unit for the T350 is going to be by far the most superior offering but they come at a price that most pass up. Currently showing around $1200 from a few different online vendors if it is actually available anymore.
    1994 Shadow Sedan. 2.2 N/A, A568 382,000 miles. (In the family since new).
    1987 Shelby CSX #418. Long term rebuild and restore.

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    Supporting Member II Turbo Mopar Contributor
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    Re: Interchangable LSD

    Quote Originally Posted by 135sohc View Post
    All of the aftermarket "neon" LSD units are made for the T350 transmission which by convenience uses the same (by external dimensions) differential carrier assembly as our transmissions (555/568/525 aside) with a few differences (the speedometer gear being the primary one). The 523 and 543 are identical internally, the bell-housing is the only difference.

    Modern performance has their own (presumably Chinese made as well) OBX copy as of current. It does cost more(about 2.5x) than the original cheapo plain white box special that OBX was well known for but they fixed all the Q/C issues that the original OBX units were infamously known to have.

    The Quaife unit for the T350 is going to be by far the most superior offering but they come at a price that most pass up. Currently showing around $1200 from a few different online vendors if it is actually available anymore.
    Not available, minimum order from Quaife was raised, no vendor is willing to front the overhead, not enough demand. I already looked into this a few months ago.

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    Supporting Member II Turbo Mopar Contributor
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    Re: Interchangable LSD

    Quote Originally Posted by Reaper1 View Post
    Not available, minimum order from Quaife was raised, no vendor is willing to front the overhead, not enough demand. I already looked into this a few months ago.
    Wow glad I bought two LSDs a few years back from TU
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  6. #6
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by Reaper1 View Post
    Not available, minimum order from Quaife was raised, no vendor is willing to front the overhead, not enough demand. I already looked into this a few months ago.
    Out of curiosity, how many would need to be purchased?

  7. #7
    Hybrid booster
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    Re: Interchangable LSD

    I seem to recall reading 50, but could be wrong.

    Quote Originally Posted by cordes View Post
    Out of curiosity, how many would need to be purchased?

  8. #8
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by EaZyE426 View Post
    I seem to recall reading 50, but could be wrong.
    Well, you can forget about those ever being made again. I doubt 50 would ever be sold if they were on the shelf today. Everyone talks a big game about wanting x, y, or z product, but they rarely step up to buy it when someone invests the money to make it.

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    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: Interchangable LSD

    https://shop.quaife.co.uk/qdf3i

    about $1200 at the current exchange rate.

    1994 Shadow Sedan. 2.2 N/A, A568 382,000 miles. (In the family since new).
    1987 Shelby CSX #418. Long term rebuild and restore.

  10. #10
    turbo addict
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    Re: Interchangable LSD

    Didn't Chris @ TU offer a different than OBX or Quaife LSD option a couple years ago for that application?
    http://www.turbo-mopar.com/forums/sh...-Differentials
    Todd

  11. #11
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by 4 l-bodies View Post
    Didn't Chris @ TU offer a different than OBX or Quaife LSD option a couple years ago for that application?
    http://www.turbo-mopar.com/forums/sh...-Differentials
    Todd
    Discontinued.

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  12. #12

    Re: Interchangable LSD

    Yeah it's about 750 I think at TU

  13. #13
    turbo addict
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    Re: Interchangable LSD

    Quote Originally Posted by tryingbe View Post
    Wow that didn't take long. It just came to market 2-3 years ago.

  14. #14
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by nordic2068452 View Post
    Yeah it's about 750 I think at TU
    https://www.ebay.com/itm/OBX-Racing-...4AAOSwx1ReRw78

    Get it, get it now. 2 left.
    Tailgate at your own risk.

  15. #15

    Re: Interchangable LSD

    I ran across an Ed Peters obx moded LSD. Not sure if thats just a sales jargon or if they're all engineered from Ed Peters chrco corp.

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    Re: Interchangable LSD

    Quote Originally Posted by cordes View Post
    Out of curiosity, how many would need to be purchased?
    I think it is either 30 or 50, but either way, there aren't enough of us that would buy them, even if we each bought 2, to justify the overhead at $1200 each.

    Quote Originally Posted by 135sohc View Post
    https://shop.quaife.co.uk/qdf3i

    about $1200 at the current exchange rate.

    They can't be ordered individually...batch orders only. 30 or 50 at a time.

    Quote Originally Posted by chromguy View Post
    Wow glad I bought two LSDs a few years back from TU
    Same!

    Quote Originally Posted by 4 l-bodies View Post
    Wow that didn't take long. It just came to market 2-3 years ago.
    Goes back to what I posted on FB...our group in general are too cheap, so we don't get any support because very few of us are willing to plunk down the cash.

  17. #17
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by Reaper1 View Post
    I think it is either 30 or 50, but either way, there aren't enough of us that would buy them, even if we each bought 2, to justify the overhead at $1200 each.



    They can't be ordered individually...batch orders only. 30 or 50 at a time.



    Same!



    Goes back to what I posted on FB...our group in general are too cheap, so we don't get any support because very few of us are willing to plunk down the cash.
    In the past, I think that would have been the end of the story. These days, I think there are too many guys who don't want to track down parts etc. and just want to keep their car on the road. I guess that could still be considered too cheap, but today a new trans or engine costs way more than the perfect condition unit one could retrieve from Any-JY-USA up until scrap got super high about 15 years ago. Heck, shipping on some stuff will run you what the actual part would have cost from the JY years back.

  18. #18
    Supporting Member II Turbo Mopar Contributor
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    Re: Interchangable LSD

    I apologize to the OP for a slightly off topic question while we are talking about LSD. I am currently installing my TU traction squared LSD in my CSX. I am still reading up on gear based LSD and ran into a surprising debate that I am hope you all can hep clarify. I have seen Jeep owners complain about gear type LSD on ice or rainy surfaces, some claim the vehicles are difficult to control on these surfaces and the open diff is superior. Other say the gear based LSD works great on these surfaces...
    It appears a significant number are on each side of the argument.
    Anyone with experience on either side?
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  19. #19
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by chromguy View Post
    Anyone with experience on either side?
    I have the OBX, works fine in rain.
    Tailgate at your own risk.

  20. #20
    turbo addict Chris W's Avatar
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    Re: Interchangable LSD

    Quote Originally Posted by 4 l-bodies View Post
    Wow that didn't take long. It just came to market 2-3 years ago.
    We did one run of our Traction˛ units. Unfortunately, they arrived just in time for the unanticipated import tariff to be applied which dug in to our profit margin. We considered a second run but since OBX decided to restart production of them we knew we could not be competitive with their pricing in this market. Instead we pursued the 555/568 version since it is less common. We were in the testing phase when higher import tariffs were being discussed so we just decided to wait things out.

    Chris-TU



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    Last edited by Chris W; 04-01-2021 at 09:23 AM.
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