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LSD Check!
Author _ Katman | Created_ September 2004 | Last Update_ September 2004

SYNOPSIS

This article shows a few examples of how to check a B-series cable and hydro transmissions for a Limited Slip Differential aka LSD.

CABLE B-SERIES TRANNY LSD CHECK :

There are only 2 cable B16A LSD tranny's Honda of Japan released in the past -- the 89-91 Y1 and the 92-93 YS1 'missions. The Y1 LSD's were for the most part equipped with a clutch-type LSD. The YS1 is equipped with a gear-type LSD, and also shares the same internal tranny components as the hydro B16A (Y21/S21) 'missions.

There are 2 ways to check a cable B-series 'missions for LSD:
  1. Check for the "LSD" stamp...
    This is mostly found on the Y1 'missions.
    Take a looksy on the top side of the transmission casing for this punched-in "LSD" stamp:
    (Click on the thumbnail)
    Clik me for image!
    NOTE
    : This stamp is not found on all Y1 B16A 'missions, for some weird, unorthodox, Honda reason.
    Which brings us to example #2..

  2. Check the differential hole...
    Simply look through the differential hole.
    If you see that the diff hole is totally hollow, with no obstruction in the way, the tranny is LSD equipped.
    If the diff hole is not hollow and has a bar through the middle, the 'mission has a stock differential.
    (see example)
    Clik me for image!

HYDRO B-SERIES TRANNY LSD CHECK :

There's a handful of JDM & US hydro B-series 'missions available in the world, yet they all particularily share the same LSD identifiers, similiar to that of cable B-series 'missions.

Here's a list of hydro B-series engines that came with optional LSD transmissions (depending on vehicle model):
92-95 B16A - Y21
96-00 B16A - S4C
98-01 B16B - S4C
94-01 B18C/ B18C-R - Y80 & S80
  1. Check for the "LSD" ink stamp...
    This is really easy to indentify.
    Simply look on the front section of the 'mission casing for this ink "LSD" stamp:
    (see example)
    Clik me for image!
    NOTE
    : This ink stamp can easily be rubbed or cleaned off, which again, brings us to example #2..

  2. Check the differential hole...
    Like the cable B16 'mission, simply look through the differential hole.
    If you see that the diff. hole is totally hollow, with no obstruction in the way, the tranny is LSD equipped.
    If diff. hole is not hollow and has a bar through the middle, the 'mission has a stock differential.
    (see example)
    Clik me for image!

    Peeking through the diff whole is thee best way to check a transmission for LSD, while the tranny is off the car of course!

ADDITIONAL INFORMATION

Here's a little bit of tech info regarding 3 types of LSD's Honda uses in their 'missions:
  • Gear Type LSD
    Gear type LSD's have gears inside of them (duh!) that mesh together when load is detected. This type is good to have because you'll probably never have to replace worn internal LSD parts, unlike the clutch type. The downside, especially for stock Type-R LSD's, is that they can internally break if your into rough circut racing. Lifting a front wheel in a turn and landing back on it is how the LSD can break. Real stiff suspension is a major factor in making a car lift during a high speed turn - so be careful!
  • Clutch Type LSD
    Clutch type LSD's have small clutches inside that engage when load is being detected. Clutch type LSD's won't break if you happen to lift a wheel, unlike gea type. The only real downside to the clutch type is the wearing of clutches over time. Just like the clutch disc inside of your tranny, the clutches inside this LSD wear out too, and need replacement/servicing.
  • Viscous Type LSD (rare)
    Viscous Type are similar to the viscous LSD's used in some AWD vehicles. The way these work is that a special fluid is used in the differential which THICKENS when excessive slip is induced. Stators and impellors in the diff make this even more efficient. Although, there is a slight delay in the locking of the differential. This LSD type work very well and last a long time but cost maad loot. According to my resources, this was a special order LSD for JDM 96-97 ITR integra's only. No other countries would receive this optional LSD, only Japan. The cost was about twice as much as a the common gear type LSD. One odd thing though, Honda of Japan does NOT have this optional LSD type for 98+ Integra-R's!

The information in this article applies to:

  • Cable & hydro B-series transmissions