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Another S14/200sx Gearbox Conversion


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#1 sexual_sushi

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Posted 04 August 2011 - 02:10 PM

Hi guys, a couple of years ago now we put a S14 gearbox into my 1973 240z. I tell everyone I talk to that it is the best thing I have done to the car (for a street driven car).

I took a heap of photos when doing it and I will do a bit of a write up (from what I remember) when I get a chance, but for now here are a few pics of the gearbox cross member mount that I am uploading for Casey who is currently doing the transplant.

Not many of the tutorials mention the modifications required for the bracket or if they do they pass it off as a simple mod. But I think to do this to an engineer certified, roadworthy state, it is not a simple job.

The s14 gearbox is slightly longer than the 240z box and as a result the rear mount sits about 35mm(? I'll have to check this) further back. I think some of the tutorials tell you to weld on a tab to bolt into which is probably fine in the US but I'm not sure how it would go in Australia. To resolve this my old man decided to make up the crossmember bracket from scratch but instead if it being straight, it has a bend in it putting the bolt hole further back.

I'll upload a scan of the plans with measurements as the photo isn't very clear but here they are anyway:

Original 240z Gearbox Crossmember
<a href="http://www.shaun-mal...Mount.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

New S14 Crossmember Plans
<a href="http://www.shaun-mal..._Plan.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

Making S14 Crossmember
<a href="http://www.shaun-mal...Mount.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

Finished S14 Crossmember
<a href="http://www.shaun-mal...hed_1.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

Finished S14 Crossmember
<a href="http://www.shaun-mal...hed_2.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

S14 Crossmember In Car
<a href="http://www.shaun-mal...n_Car.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>



#2 sexual_sushi

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Posted 04 August 2011 - 02:10 PM

<space saver>
Machined Z Bellhousing
<a href="http://www.shaun-mal...using.jpg"><img src="http://www.shaun-mal...Small.jpg"></a>

#3 sexual_sushi

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Posted 04 August 2011 - 02:10 PM

<space saver>

#4 Z

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Posted 04 August 2011 - 02:40 PM

Great thread!
Yes I'm doing this conversion now - S14 gearbox has been reconditioned, dropped the bellhousing off to be acid and bead blasted today, then over to a local engineering place here on the coast for the modifications to the 260z housing, damn shame I have to go away next week! The mods for the housing look to be:

-Bore larger hole for countershaft bearing (from 56mm to 62mm dia) I'm choosing to go the larger countershaft bearing on the 71C.
-Larger shift rod hole (from 14mm to 16mm dia)
-Grind down the boss around the countershaft bearing to clear the wider gear at the front end of the counter shaft (3mm has been suggested)

I'm no expert on this however, see this thread for another take on it: http://www.viczcar.c...pic,3210.0.html

Once the housing is complete I can take it to the gearbox reconditioning shop who will fit it all together.

Thanks to Sushi for making this thread, this is a nice upgrade if you want a gearbox with wider gear widths, synchro and not forty years old.

#5 sexual_sushi

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Posted 04 August 2011 - 03:19 PM

Added a pic of the machined bellhousing, if you click on it it will enlarge to full size and you can see where the surface has been machined down. I will upload an image with the cut/machined areas highlighted and measurements etc when I get a chance.

#6 peter t

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Posted 09 August 2011 - 05:21 PM

Go to Whittie's thread. thats the one I followed as well as Lurchoes. Should all be put in a stickie which I think it is. Thanks Shaun as all info is better than none. 8)

#7 sexual_sushi

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Posted 09 August 2011 - 09:39 PM

Thanks Peter, yeah this thread is a bit redundant as there is a wealth of info out there already for this conversion (which I used when doing my conversion). I do have plenty of pics though so I should be able to do a writeup that is fairly step by step for the less mechanically minded people such as myself ;) Especially when it comes to the pulling apart and assembling of the gearbox.

Also Casey has just informed me that his 71 has different gearbox mounts to the 73 version. I think the 73 version has the same setup that was used in the 260z's so this bracket above should be suitable for them.

No I just have to find the time to flesh this thread out :S




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