lauko Posted September 26, 2016 Share Posted September 26, 2016 (edited) Hello! I was searching for a 5-speed transmission to put into my '72 240Z. Although I aimed for a 280ZX box, I have now found an EU 240Z 5-speed, a two-piece-case FS5C71B. The engine of my car is being built right now and will be a 3.1 NA stroker. I am wondering if the 240Z box will be able to hold the torque. Is a 280ZX box any stronger than the 240Z box? Thanks, Peter Edited September 26, 2016 by lauko Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted September 26, 2016 Share Posted September 26, 2016 They should have the same width gears on the inside, therefor the same stregth. The 71B's have been known to hold up 300whp without too much abuse. What power are you shooting for? Quote Link to comment Share on other sites More sharing options...
lauko Posted September 26, 2016 Author Share Posted September 26, 2016 Great, thanks for the info! About the power...I can't tell anything yet One more question...the FS5C71B has an 4-bolt output flange, not the splined shaft like the other boxes (including my original 4-speed manual). Is there an easy conversion between flange type output -> spline type output? Is it possible to remove / replace the final output shaft of the gearbox? Otherwise I guess I might also need a matching prop shaft... Peter Quote Link to comment Share on other sites More sharing options...
NewZed Posted September 26, 2016 Share Posted September 26, 2016 Might be easier to swap the propeller shaft yoke instead, if you can find one. The 240Z's have removable u-joints. Don't forget to consider gear ratios. Quote Link to comment Share on other sites More sharing options...
260DET Posted September 30, 2016 Share Posted September 30, 2016 C stands for close ratio, W stands for wide ratio in Nissan gearbox speak. Quote Link to comment Share on other sites More sharing options...
NewZed Posted September 30, 2016 Share Posted September 30, 2016 I thought the C and the W indicated the type of synchros. FS5C___ is servo/Porsche style in steel, and FS5W___ is Warner in brass. Some inter-info - http://datsun1200.com/modules/mediawiki/index.php?title=Synchros&style=m Quote Link to comment Share on other sites More sharing options...
lauko Posted October 6, 2016 Author Share Posted October 6, 2016 Interesting info regarding C and W versions - and yes your explanation matches with the ratios! Thanks! Otherwise the 4-bolt driveshafts are as it looks almost impossible to find, so I'll probably go the easy way and keep searching for a 280ZX box... Quote Link to comment Share on other sites More sharing options...
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