dpuma8 Posted December 5, 2011 Share Posted December 5, 2011 I am attempting to do the FC5W71C swap into my Z car. I see that the 300zx also had the same transmission so is there any difference between the transmissions? All the notes I see for swapping the FC5w71C transmission mention the 240sx without any mention of the NA 300zx. Will the 300zx transmission work exactly like the 240sx transmission? Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted December 6, 2011 Share Posted December 6, 2011 We should be talking about almost 5 different transmissions right now.. 240sx transmission Z31 300zx transmission (3 different types) Z32 300zx transmission (very different from the above) Here is some excellent information. http://www.az-zbum.com/information.transmission.shtml Quote Link to comment Share on other sites More sharing options...
rejracer Posted December 7, 2011 Share Posted December 7, 2011 (edited) I have never heard of the FC5W71C are you talking about an automatic? If so, then no it's very different. Summary of 300zx transmissions, gearing info omitted: FS5W71C - 84-89 NA Fs5r90a - 85-86 Turbo (T5) Fs5r30A - 87-89 Turbo and 90-96 all. I have a FS5W71C from a 1987 300zx. It has the wider 20mm gears, but when I had it open I did not check for the double cone synchro on 2nd and 3rd. It did have a synchronized reverse. Based on that, I think it's the same, regardless for my application, I know I can get it to work as I am going to fab up new mounts for the transmission. When I bought the transmission I compared it to a 280zx transmission and found it would work based on what I was planning on doing. Edited December 7, 2011 by rejracer Quote Link to comment Share on other sites More sharing options...
dpuma8 Posted December 13, 2011 Author Share Posted December 13, 2011 Sorry, I did mean the FS5W71C transmission. I am just trying to figure out if there are any external differences between the 240SX and the Z31 NA Transmission. There is a deal locally for a VG30e with the FS5W71C attached to it for $150 so I was thinking of picking it up and putting it into my 280Z. I know for sure that the FS5W71C transmission from a KA24 engine will fit to the L series with some small modifications. Will a FS5W71C from a VG30 engine also require the same minimal adjustments? Quote Link to comment Share on other sites More sharing options...
rejracer Posted December 21, 2011 Share Posted December 21, 2011 I measured the bellhousings today and they are the same length, this to me means the transmissions are the same, aside from the bell housing bolt pattern. I was not certain of all the differences myself. Quote Link to comment Share on other sites More sharing options...
i r teh noobz Posted December 24, 2011 Share Posted December 24, 2011 The gear ratios are said to be a bit different, but they are essentially the same transmission. I sold a 71C from an 85 Z locally and the buyer confirmed that it fit his S13 with only a bellhousing/front case swap. Quote Link to comment Share on other sites More sharing options...
kaito Posted February 3, 2012 Share Posted February 3, 2012 (edited) The 240sx swap involves using a z bellhousing vs the 300zx having to machine the bellhousing. Based on this info im assuming you cant just swap the bellhousing from the z to the 300zx like you can on the 240sx. Austin 240hoke still sells adapters for the 300zx swap btw. Edited February 3, 2012 by kaito Quote Link to comment Share on other sites More sharing options...
rejracer Posted February 5, 2012 Share Posted February 5, 2012 Kaito, The adapters for the 300zx are intended for the Fs5r30A which is a much stronger transmission than the "240sx" transmission. I assume that they would work for the 300zx Fs5w71c as well, but why would you buy 250$ in adapters when you can get 150.00 in machine work done on an L series bell housing. The 300zx fs5w71c will swap bell housings with an early Z or ZX transmission. The 300zx Fs5r30A will not swap bell housings with a Z transmission. I have come to find out that the RB20 FS5W71C is ~2" shorter than the 240sx transmission. I will now need to take measurements on my 300zx transmission to determine it's length. Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted February 5, 2012 Share Posted February 5, 2012 (edited) The 240sx swap involves using a z bellhousing vs the 300zx having to machine the bellhousing. Based on this info im assuming you cant just swap the bellhousing from the z to the 300zx like you can on the 240sx. Austin 240hoke still sells adapters for the 300zx swap btw. There is still machining involved using the transmission from a 240SX. Something to compare would be the input shaft length, diameter and spline. Edited February 5, 2012 by Six_Shooter Quote Link to comment Share on other sites More sharing options...
rejracer Posted February 7, 2012 Share Posted February 7, 2012 Machining is a given on these trans swaps 300zx, 240sx, 240-280zx, and RB transmissions all use the same length input shafts/bell housings. I don't know if the RB 71C box has the same splines, but I assume they do at this point. I know all the others do. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.