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Powertrain 1992 Automatic Transmission

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Joined
27 July 2007
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Location
Denver, CO
$3,950 OBO
1992 NSX VIN: JH4NA1267NT000317
Transmission Number: MR9A-1003142 NPR7 A7
Mileage: 137k

This is a complete automatic transmission assembly from my 1992 NSX. It is fully functional with no slipping in any gear. Last fluid change at 123k miles using Honda ATF DW-1. When drained, fluid was cherry red and clean. The way I see it, you have a few options with this transmission. You could bolt it right on and drive, as it was fully functional when removed. Or, you could have it refreshed at a transmission shop. I would replace the main filter, solenoid screens and clutch packs (my choice). Finally, you could send it Pat at Level 10 for a "power" rebuild and keep your existing transmission as a spare, since these units have long been discontinued.

With respect to rebuilds, it's important to understand how the NSX auto works. Tthe NSX transmission uses fluid pressure to engage and disengage clutch packs as you shift. They are very similar to the clutch packs inside the differential- basically lots of thin metal discs that are pressed together. Each clutch pack controls a gear. The fluid is run through an internal filter, which is the problem. As the clutch packs engage and disengage, they wear out, which causes metal dust to mix with the fluid. The filter cleans out the dust, but eventually it will become badly clogged. Once clogged, the fluid will build up inside the filter, leaving the torque converter and solenoid passages dry. Once the pressure gets high enough, the fluid "blasts" past the filter and shocks the torque converter. It also slams the clutch packs together and they eventually shatter. This is what causes the slips and ultimately failures. The NSX auto is not "weak" or fragile. With proper maintenance, the clutch packs will last a long time and the torque converter will not break. Basically, if you replace the filter often enough, you can run a long time. That is why this transmission, which has had regular fluid changes, runs well at 137k, but others with lower miles have failed. Because the filter is inside the transmission case, it's an expensive job and no one does it. By regularly draining the dirty fluid, a lot of the metal dust was removed from the system. Still though, it should probably have the filter changed soon. The good news is that because it is out of the car, you can have all of the work done much more cheaply. The filter itself is only like 80 bucks.

I am willing to ship at buyer's expense and it will be packed carefully. I will also include the AT computer, drive plate and bolts.

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Just a piece of advice. That tranny is never going to sell at that price. Any and all auto trannys sell for way less. Just trying to help.
 
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Bump! I'm officially in a competition with Tyler to see whose goes first!
 
Bump! I'm officially in a competition with Tyler to see whose goes first!

Looks like Tyler won that one.

I'm guessing my account is too "fresh" to send you a PM (long time lurker, only registered to stop playing 20 questions with the search feature, so no posts to speak of), but I'm interested in this.
 
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