I have a few gearboxes lying around but none of them clearly show which type they are.

My problem is that I don't know which gearbox to use.
A few years ago I converted an F5W71C box which I think it is called and which is coming out of a Silvia 180SX (CA18ET) to an L28 bell housing.
Not to difficult to do. Now I have the CA bell housing available and I want to use this housing to bolt another 5 speed up to a CA18DET for placement in a '77 180B (Aus. 200B).

I measured everything and all seems to fit but the box I have available is one of a '82 280ZX, I think it is called an FS5W71B.

Would this box be strong enough to hold ~300-325 bhp?

The CA18 gearbox uses a much larger shifter housing compared to the older boxes.

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Not a problem with the strength of that box,
easy to mix & match parts with most of those
series.

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A little knowledge is a dangerous thing.
www.datsport.com

"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT

Are you saying you want to put a 71B box behind and engine that by default has a 71C? Why go backwards? Is it that hard to get your hands on a CA18DET gearbox where you are?

Dave

PS. I get the feeling I'll be testing the strength of the 71A box shortly.

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USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD