14 replies to this topic

[Martinracing98]

I am getting ready to buy transmission parts. My car is 99, but I do not know about trans. Number JM1NB3532Y01460650. How do I make sure I get the right parts? Are all NB trans parts interchangable, and I should buy the newest. For example M501-17-404D instead of M501-17-404C?

[FTodaro]

You want to go to the part list on line that is for the year of the car and trans that your buying parts for to start with. Most of the common parts are interchangeable with a few exceptions on the NA and NA18 trans.

 

On the listing of later parts, you will automatically be directed to the latest part number the part number you listed above is actually for the 3-4 shift for and the current part ends in "D".

 

The system should automatically substitute the latest part number but try to pick the latest version. Often its price that changes not the part. 

[Martinracing98]

You want to go to the part list on line that is for the year of the car and trans that your buying parts for to start with. Most of the common parts are interchangeable with a few exceptions on the NA and NA18 trans.

 

On the listing of later parts, you will automatically be directed to the latest part number the part number you listed above is actually for the 3-4 shift for and the current part ends in "D".

 

The system should automatically substitute the latest part number but try to pick the latest version. Often its price that changes not the part. 

 

Thanks! Just for clarity. When you say year of the transmission NB is critical instead of 1999 versus 2000, correct? If 1999 versus 2000 is important, how do I determine the year of the transmission I have?

[BNaumann]

Thanks! Just for clarity. When you say year of the transmission NB is critical instead of 1999 versus 2000, correct? If 1999 versus 2000 is important, how do I determine the year of the transmission I have?

If it matters there is a VIN tag on the trans.

[davew]

There are basicly 3 transmissions in a Miata, NA1.6, NA1.8 and NB. There are some very minor differences inside an NB from year yo year. None of these differences effect the parts for rebuilding. I notice them because I see the insides of so many trans's. The cases and some of the shift mechanism are different between NA and NB

 

Syncros (except 1.6 second gear) are all the same. Syncro rings, shift forks, shift rods (again except 1.6 3rd-4th rod), seals gaskets and most of the small parts are all the same. Part numbers will all end up superceding to the latest version.

 

Dave

[Sphinx]

With the Mazda price cut on the transmissions, I now wonder whether rebuilding an old one is worthwhile or whether one should just get one from Mazda.  With free shipping, it isn't bad.  I remember Mike Collins saying that his recommendation was to buy new one and never have to worry about it (assuming one doesn't ruin it).  Is that still the consensus?

[davew]

With the Mazda price cut on the transmissions, I now wonder whether rebuilding an old one is worthwhile or whether one should just get one from Mazda.  With free shipping, it isn't bad.  I remember Mike Collins saying that his recommendation was to buy new one and never have to worry about it (assuming one doesn't ruin it).  Is that still the consensus?

Not in my biased opinion.

 

Street boxes are work hardened. The gears have gotten hot a million times, and cold a million times. All the gears worn smooth from many miles. The new boxes do not have the shaft saver sleeve installed.

 

I believe most of the trans guys have agreed, we will have a lot of pretty cases in a year or so to rebuild.

 

I do not think anyone has said "new is better than rebuilt"

 

Dave

[Sphinx]

Not in my biased opinion.

 

Street boxes are work hardened. The gears have gotten hot a million times, and cold a million times. All the gears worn smooth from many miles. The new boxes do not have the shaft saver sleeve installed.

 

I believe most of the trans guys have agreed, we will have a lot of pretty cases in a year or so to rebuild.

 

I do not think anyone has said "new is better than rebuilt"

 

Dave

 

What is the "shaft saver sleeve"?  I didn't see any reference to it in the GCR.

[FTodaro]

You mean the Spline Spacer to help save the counter shaft from twisting? This is the part number.

0000-02-5722-SP                             51.00

[Sphinx]

You mean the Spline Spacer to help save the counter shaft from twisting? This is the part number.

0000-02-5722-SP                             51.00

 

Got it, thank you.

[davew]

I designed the dam thing, I will call it what I want !!!!!!!!

[Armando Ramirez]

I designed the dam thing, I will call it what I want !!!!!!!!

LOL!

[Sphinx]

I designed the dam thing, I will call it what I want !!!!!!!!

 

Like Armando, I died laughing when I saw this!  Easy Francis!

 

Ok, so what does it do (something more explanatory than it prevents the countershaft from twisting)?  Where does it get installed?

[Bench Racer]

Ok, so what does it do (something more explanatory than it prevents the countershaft from twisting)?  Where does it get installed?

Hope this helps make sense. Words from the wise guy likely would be it's BIGGER and HARD.

 

http://mazdaracers.c...splined +spacer

[Sphinx]

Hope this helps make sense. Words from the wise guy likely would be it's BIGGER and HARD.

 

http://mazdaracers.c...splined +spacer

 

 Thank you.