Datsun Roadster Forum-311s.org

Howdy.

I read the FAQ about the 5 speed swap for the early R16.

So just to confirm, a 5 speed U20 gearbox can be used to replace a 4 speed gearbox on a R16 engine, yes?

I would also like some pictures of (or links to) 5 speed (and 4 speed boxes I suppose) so I can pick the differences when looking a them, if anyone has them. Do they look different externally?

Can anyone identify this gearbox? The owner doesn't know what it is, but I got a tip-off that it might be a 5 speed from a roadster.


Thanks,
Mr C.

Yes, with minor modifications and the correct parts you can fit a 5 speed to a 1600 early or late. The obvious difference is how the drive shaft connects to the rear of the tranny. The 4 speed has a splined shaft that slides into the rear of the tranny. The 5 speed has a fixed flange that a yoke bolts to then the drive shaft connects to the yoke via splines. The tranny you have there does appear to be a 5 speed by the rear flange. Sorry, I do not have any pictures. Make sure you use the correct backing plate for the 5 speed or you could damage your crank thrust bearings. The 5 speed plate is quite a bit thicker than the 4 speed backing plate.

Steve

i THINK you also have to get a 5spd tranny mount. If so, get with Dave Brisco aka "dbrick" on swapping for a chevy mount before paying $55 for a stock mount.

Mr. C,

BTW it's good to see you here, as well as the CZCC site!

That is a roadster 5 speed FS5C71A, with the roadster crossmember.

based on the ribs on the case, I'd say it was the 67.5 to 69.5 Servo style, opposed to the 69.5 ~ 70 Warner Style.

It's neither the Skyline or the S30 fittment due to the short tail section and the starter possition. I'm the one who commented on EBAY (I'm SR311).

Hi Victor

Yeah I saw your message.

The guy selling it has no idea, and is still saying its for a s30, which i know its not, as the starter recess is on the wrong side, and they didnt have ribs that looked like that.

I'm hoping he drops the price to something reasonable. I think its a bit steep for a box in unknown condition.

- Craig.

My 69 had a warner tranny which I would wear out the brass syncros on a regular basis. I picked up a servo type and it's case looked the same. Also I picked up a set of servo guts, rebuilt them and placed them in my warner case. My question is what does the case really tell of it's internals.

As i understood, the earier boxes were as pictured above, with the "V" shaped ribs. The later boxes also had the "V"'s with additional ribs, gridling the case, bisecting the "V"s

FWIW, AFAIK, AIHI, ICBW, YMMV.

Nissan was very frugal with parts and there is often a very blurry separation point for when some parts were used in the place of others. "We'll start using those new ones when we finish off those cases of the old ones"

spyder wrote:My question is what does the case really tell of it's internals.

Yes thats my question too, but all I need the case to tell me is if its a 4 speed or a 5 speed.

Looks like a roadster 5 speed to me.

Looks like a roadster 5 speed crossmember too. Here's the transmount pic on the left is 5 speed with Chevy mount, right is 4 speed with broken stock mounthttp://www.311s.org/phpBB2/album_pic.php?pic_id=130

Back view, Chevy on righthttp://www.311s.org/phpBB2/album_pic.php?pic_id=131

Since we have established his is a 5spd, why does my 5 spd look different??? I can get another pic tomorrow if its needed

I think some are warner and i forgot the other type. Some have checkered design on it and some have a chess or something i forgot quite how it was. But I think there are 2 or 3 types

is one type better than the other??

define better....

conventional wisdom is that the case that has more ribbing (like yours Evan) typically has the Warner synchros. The Servo type (Porsche type) synchros last longer but are VERY pricey to replace. The Warner type (brass) are less expensive to replace, and the parts are readily available. For the street, just fix what you have. If the tranny is junk, buy another and build it up.

thanks for the info! Maybe its all just refreshing and not rebuildin.... if that makes sense