Transmission conversion 4 speed to 5 speed FS5W71B.

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Nissanman
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Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Nissanman »

I have created an album to document the conversion of my '65 SP310 from the factory 4 speed transmission to a modern Nissan 5 speed, an FS5W71B.
I intend to do this conversion, as time permits, over our southern winter.
Anyhoo, here is the link for your viewing pleasure: -
Conversion album.
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
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Curtis
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Curtis »

As they say, bully for you. I tore down my 4 speed, put in a whole bunch of new parts, put it in the car and it didn't shift quite right. So out it came and in went a good used one. That was the end of my attempts.

I took it along with my 5 speeds to our local expert. He fixed it up and I have a spare 4 speed now should I ever need it it. The 5 speeds are getting fixed including the 5th gear being welded. He recently looked at one for one of our other local guys and someone had welded the main shaft nut on. Another sins of previous owners.

The shifter hole took some time to get the correct size from members.
66 stroker, almost done.
67 basket case, paint coming soon.
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Daryl Smith
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Daryl Smith »

Nissanman,
That will be a very nice upgrade.
Assume you know the ratios of the trans you are building? The combinations you put together re: ratios of rear end and transmission, and tire size will dictate how happy you will be with it.
Will you have to modify the frame?
You will be down on power with the 1500 engine, but, with 1st to 4th gears close to the 1600 4 spd ratios, a 5th near the .852 of the roadster tranny, and rear diff in the 3.9 - 4.11 range, with stock size tires should work well for you....
Are the diesel transmissions reasonable to find in Oz? Few and far between up here, but still a few around.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
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Nissanman
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Nissanman »

As best as I can tell, here are the stock ratios and gear gaps for the new 5 speed compared with the data for the factory 4 speed: -
Gear ratio comparison.pdf

I don't know what the donor vehicle for the 5 speed was, the ratios don't line up with any of the transmissions that are listed in my modest library of Nissan/Datsun passenger car Workshop Manuals :?
Anyhoo, you can see that they are very similar.

This will be the only change to the drive train, everything else is stock.

No frame mods.
From what I can see, I might need a modified rear transmission mount depending on how the holes line up.

I really don't know about the availability of the diesel parts.
Lou Mondello in Melbourne Vic. [Oz] had one which he sold to me.
I was originally going to build an adapter plate to graft parts together but this front housing is the duks gutz.
You do not have the required permissions to view the files attached to this post.
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!
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Daryl Smith
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Daryl Smith »

The only trans I've seen documented with the 3.55 first gear was a diesel. Obviously wasn't that. Different setups in Oz I guess.

Just out of curiosity, what is the stock tire size for the 310? Equivalent modern radial size?
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
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Nissanman
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Nissanman »

The Owners Handbook quotes the tyre size as 5.60 x 13.
That equates to a ridiculous 142 x 13 :shock:
I'm running a set of Khumo 175/75 x 13 tyres which 580mm [23"] in diameter.
A tall tyre compared to stock which would be I think in the order of 560mm.
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!
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Daryl Smith
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Daryl Smith »

Well, the 1st 4 gears are pretty close to stock so you should get used to it pretty quick.

Running it through the spreadsheet, assuming a 3.89 rear ratio:
@3000 rpm
1st - 15 mph
2nd - 24 mph
3rd - 38 mph
4th - 54 mph
5th - 66 mph

60 mph @ 2723 rpm in 5th
70 mph @ 3177 rpm in 5th

This should actually work fairly well with a stock 1500 engine, tho you'll likely be shifting back to fourth for the bigger hills.
Daryl
'66 2065cc Stroker "Frankie", EFI and GM D585 ignition
she aint pretty, she just looks that way...
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Nissanman
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Re: Transmission conversion 4 speed to 5 speed FS5W71B.

Post by Nissanman »

Hehehehe!
Hills are always a challenge for the little 1500, especially with a passenger on board.
I'm looking forward to the experience.
I'm over the lack of pleasure the current box is giving me and high revving on the highway :(
Thanks for the feed back, that info. is interesting :wink:
Nissanman, just trying to help.
1965 SP310 Engine No. G-93326 Car No. SP310-10817
http://nissanman.shutterfly.com/117
McQueen!
He's on the road again!