7tooZ

280ZX vs 280ZX 2+2 transmissions

38 posts in this topic

ID: 1   Posted

Is the transmission in a 2+2 the same as the 2 seater? Cant file a chart that differentiates them?

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ID: 4   Posted

Other than then 82/83 turbo's that got that silly BW 5 speed, all the NA cars have the same transmission within their years. The ratios in the first couple of years are different than the later ratio's, most notably the over drive. 82-83 5 speeds are the sweet spot all around.

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ID: 6   Posted

The clutch is bigger (240mm / 225mm) on the 2+2, but that really has no effect on the transmission itself. 

 

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ID: 7   Posted

4 hours ago, zKars said:

Other than then 82/83 turbo's that got that silly BW 5 speed, all the NA cars have the same transmission within their years. The ratios in the first couple of years are different than the later ratio's, most notably the over drive. 82-83 5 speeds are the sweet spot all around.

My understanding is that the percent variance between 79-80 and the 7/80- 6/83 is only 3%. Doesn't seem like, it would make a big enough difference in front of a 3.70 diff, to the extra cost to find one.

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ID: 8   Posted

2 hours ago, Terrapin Z said:

The clutch is bigger (240mm / 225mm) on the 2+2, but that really has no effect on the transmission itself. 

 

Should still work with a 240 clutch and zx throw out, Correct?

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ID: 9   Posted

Just keep ALL the bits from the 240 clutch wise (disk, plate, throwout, bearing sleeve) and it will bolt up and work. Don't use any of the stuff from the car with the trans you're using.

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1 hour ago, 7tooZ said:

My understanding is that the percent variance between 79-80 and the 7/80- 6/83 is only 3%. 

I think there are 3 different ones, with the later two being very similar other than the slight difference in the 5th ratio.

280 ZX (8/78-7/79) FS5W71B 
5 spd "B" type
3.321 2.077/37% 1.308/37% 1/24% 0.864/14% also 810 Maxima
280 ZX (8/79-6/80) FS5W71B 
5 spd "B" type
3.062 1.858/39% 1.308/30% 1/24% 0.773/23%  

280 ZX (7/80-6/83)

FS5W71B 
5 spd "B" type
3.062 1.858/39% 1.308/30% 1/24% 0.745/26%
 

 

1 hour ago, 7tooZ said:

Should still work with a 240 clutch and zx throw out, Correct?

I believe you use one clutch or the other. The throwout collar is different as well. 

You will need to address the shifter clearance at the tunnel opening. 

I am putting the same set up together myself. I just found a shifter that should work without having to trim anything out of the tunnel. I haven't tested it yet though. 

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I believe you use one clutch or the other. The throwout collar is different as well. 
You will need to address the shifter clearance at the tunnel opening. 
I am putting the same set up together myself. I just found a shifter that should work without having to trim anything out of the tunnel. I haven't tested it yet though. 

I would be interested in see what shifter you have found. Looks like I anger theZ out of storage on Tuesday and can get started on the conversion while Keating delivery of the trans.


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I have a '79 2+2 transmission in my '72.  The ZX shifter wouldn't work with my console and boots. They are straight and my boots are angled toward the back. Some grinding of the '72 shifter worked for me. 

I put the 240 speedo cog in the ZX transmission, new oil seal around the speedo cable too.

I like it. 75 @2,200rpm.

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ID: 13   Posted (edited)

11 hours ago, 7tooZ said:

Should still work with a 240 clutch and zx throw out, Correct?

Always use the throwout bearing collar that goes with the clutch. If you use the 240Z clutch, use the 240Z throwout bearing collar. Its the pressure plate height that is different, not yhe transmission.

If you want a close ratio than any NA Coupe after August 79 will be fine. I find it hard to believe you will notice the difference between the 5th in the 1980 model compared to the 1981 - 83 model.

For info: If you do go with a 2+2 it will be the same as the 280Z wide ratio 5 speed. First will be very low with a 3.7 or 3.9 diff. The 240mm clutch will work fine in a 240Z, but it is heavier. You should use a lightened flywheel if you use it. The 240mm has a lot more grip, but keeps a soft clutch pedal like the original clutch. I use one with a lightened flywheel and I like it.

I made this table a while back to help me finding a suitable transmission. It might be some help to you looking for a transmission.FS5W71B transmissions.JPG

Edited by EuroDat

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10 hours ago, 7tooZ said:


I would be interested in see what shifter you have found. 

The stock 72 shifter can work with some grinding like Siteunseen mentioned. For the earlier cars like your's and mine (70) with the A trans. I hear some trimming is still needed at the tunnel opening and possibly the console too. 

This is the stock one

Shifter b.jpg

Some take and bend a s curve in the one above and it clears the tunnel. 

This is sorta like the Nismo one that is NLA.

I just bought a parts car and it had one like this in it. 

Shifter C2.jpg

A Nissan truck has this one that I have been looking for. I finally found one at Tumwater Pick N Pull

The one on the bottom. It has the same base as the ZX shifter.

shifter D.jpg

 

7 hours ago, siteunseen said:

I put the 240 speedo cog in the ZX transmission, new oil seal around the speedo cable too.

Don, if you are going with a 3:70 (same one I picked) you need the blue speedo cog, you can get just the cog 32703-78102 and mount it into the ZX holder. Your old 4 speed holder will not work in the new ZX trans. If your 2+2 trans does not have the holder you can still get the assembly from Nissan with a blue cog in it (32702-58S18)

While the trans is out I would replace the front and rear seals too.

 

7 hours ago, EuroDat said:

Always use the throwout bearing collar that goes with the clutch. If you use the 240Z clutch, use the 240Z throwout bearing collar. Its the pressure plate height that is different, not yhe transmission.

The 240mm clutch will work fine in a 240Z, but it is heavier. You should use a lightened flywheel if you use it. The 240mm has a lot more grip, but keeps a soft clutch pedal like the original clutch. I use one with a lightened flywheel and I like it.

Agreed EuroDat, It is a whole package either way all 225mm or all 240mm

I am going with a 240mm kit with the 240mm collar that came with my 2+2 trans and a lighted flywheel. I weighed my new 240mm kit against the old stock 225mm kit (flywheel, pressure plate, and clutch disc) and it was only 6 or 7 pounds lighter overall. I didn't want it to rev like an indy car. (too light)

TZ

 

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Agreed EuroDat, It is a whole package either way all 225mm or all 240mm
I am going with a 240mm kit with the 240mm collar that came with my 2+2 trans and a lighted flywheel. I weighed my new 240mm kit against the old stock 225mm kit (flywheel, pressure plate, and clutch disc) and it was only 6 or 7 pounds lighter overall. I didn't want it to rev like an indy car. (too light)
TZ
 

Great info thanks


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Thx. So from that I get that light weight flywheel isn't needed unless it used in racing.
Does everyone agree?


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I have a light weight flywheel. Its more to compensate for the heavier 240mm pressure plate and clutch disc. I had it lightened in a shop that does that a lot. Mine is not as light as the fidanza aluminium units https://fidanza.com but I didn't want it to be. I think they are a little too light for street use. Not very drivable down low in the revs.

If you prefer to drive with the engine mostly in the 1500 to 3500 rpm band then I would not go for a lightened flywheel.

A lightened flywheel will help acceleration and deacceleration. The engine will react more to any throttle movements.

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Don, 

My reasons for opting for a lighter flywheel is in the same realm as EuroDat, to compensate for the 240mm disc. It will also make the car rev a "little" quicker as it is still under the stock package weight. 

Agreed the Fidanza is too light for street use at 10.7 lbs. I think mine is 14.5 lbs and with the 240mm clutch weight it should be a happy medium (full clutch plate, not the 6 puck race plate.) 

I have read it is easier to stall the car from a dead stop so there will be a little foot reaction learning curve I'm sure.

With the cam I have my car likes the higher RPM's, 3000 and up range anyway, I wanted to make the throttle response a little snappier. 

You could just have two or three pounds taken off yours, to gain a little of that snap but retain all of the daily driver ability.  You don't have to buy a new lightened flywheel there are places that turn and balance the stock one.

Option options options.......Do what you think is the best for your driving style.

 

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Use the ZX inner shifter boot which was made to allow for a 5th gear position. A 280 5spd will work too but I've found the ZX is less restrictive.

I found this out when the shifter would pop out of 5th when I lifted using the 4-spd inner boot. Thought it was the tranny but was happy to find out it wasn't.

The ZX outer, trimmed works just fine in a 240 console.

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11 hours ago, gnosez said:

Use the ZX inner shifter boot which was made to allow for a 5th gear position. A 280 5spd will work too but I've found the ZX is less restrictive.

I found this out when the shifter would pop out of 5th when I lifted using the 4-spd inner boot. Thought it was the tranny but was happy to find out it wasn't.

The ZX outer, trimmed works just fine in a 240 console.

Like this. :D

DSC01458.thumb.JPG.37ee87753f243c90e8ce3c18b9494005.jpeg

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On 4/9/2017 at 5:17 PM, gnosez said:

Use the ZX inner shifter boot which was made to allow for a 5th gear position. A 280 5spd will work too but I've found the ZX is less restrictive.

I found this out when the shifter would pop out of 5th when I lifted using the 4-spd inner boot. Thought it was the tranny but was happy to find out it wasn't.

The ZX outer, trimmed works just fine in a 240 console.

Is this the 280ZX inter boot your referred to?

280ZX.jpg

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It is. You'll need to trim it but it works just fine and it looks good (to me anyway) as it covers the shifter all the way to the knob.

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