Trans swap

[pounce46]

I’m building a 73 240 wide body car. The stock motor is blown so I’m putting in a L28 motor. I have a 5 spd trans from a 86 300ZX. Can they get together w/o being a song and dance? Or will it be easier to fine a 70’s 5 spd trans?

[EuroDat]

The trans out of the 86 300ZX (non turbo) is a FS5W71C transmission.

It will fit, but will need the bellhousing from the FS5W71B or the F4W71B. It won't just bolt up.The 300ZX VG30E engine has a different bolt pattern.

You will also need to modify or make a new rear transmission cross member and shorten the propeller shaft or find one from a series 1 240Z. The 71C is basically 50mm longer in the rear section.

[pounce46]

EuroDat thanks for the come back. I was hoping for a quick fix. But since it won’t be guess I’ll be looking for a tranny. And since there’s a lot of them out there I’ll pick one up. This one is still connected to my 300 motor. Now is there any 5sp tranny better than other?


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[EuroDat]

When peolle upgrade from the 4 speed to the speed, most go for the "close ratio" five speed in the 81-83 280ZX transmission.

Be carefull. It has to be a 280ZX coupe non turbo. The 2+2 has the wide ratio like the 280Z. 2+2 also has the larger 240mm clutch disc and flywheel, but that is another story.

Im not saying a "close ratio" is better. There are things to consider when you choose which transmission.

The 240Z 4 speed came with a 3.364:1 diff ratio. Not a good ratio with a close ratio tranny. You could search for a 260Z, 280Z or 280ZX auto model with the 3.545:1 ratio.

The wide ratio would be better with the 3.364:1 diff. Just something to think about.

I have a 3.7:1 out of a 300ZX early 86 model. It works well behind the close ratio, but I have a 280Z and it is a relatively easy swap.

Here are some documents I put together. They might help you work out what you want.

 

Identification FS5W71B.pdf

What does the codering mean.pdf

FS5W71B 280Z and 280ZX transmissions.pdf

[pounce46]

You are the Man!! The motor &
trans are from my 86 300. I didn’t keep the rear. The 3.7’s is a great top end gear w/ that close ratio box. Like the 70’ Z28’s ran. Thanks again.


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