Jump to content


Photo

260Z Gearbox Ratios - what are they???


  • Please log in to reply
10 replies to this topic

#1 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,661 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 10 July 2010 - 06:11 PM

Hi all,
I'm in need of a list of 1st to 5th gear ratios for the 260Z (71b) gearbox.
Does anyone have an ACCURATE list? The ones I've found on the net have been horribly inaccurate...
I'll update the info into the "What Gearbox's Fit" thread too ;)

#2 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,661 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 10 July 2010 - 08:36 PM

Apprently the Ratio's are:

1st:  2.906
2nd: 1.902
3rd:  1.311
4th:  1:1
5th:  0.864

Rev: 3.382

Thanks to Dimitri & his awesome little book!

#3 PeterAllen

PeterAllen

    The 1000+ club

  • Members
  • PipPipPipPipPipPip
  • 1,340 posts
  • Location:Sydney
  • Tagline:Manana!

Posted 10 July 2010 - 08:49 PM

Slightly different to those stated in the Nissan Motor Corp 260Z Service Manual for Transmission type FS5C71B, published 1975.

1st    2.905
2nd  1.902
3rd    1.308
4th    1.000
5th    0.864

Rev  3.382

I don't know anything about it personally, just quoting the book.

#4 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,661 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 10 July 2010 - 08:54 PM

Thanks Peter!
There's not much in it, in either case :)

#5 Whittie

Whittie

    Senior Member

  • Members
  • PipPipPipPipPip
  • 582 posts
  • Location:Houston - Texas

Posted 10 July 2010 - 11:23 PM

I've got a tutorial to post as soon as I can find the pictures and put them on a server for fitting a 71c box and everything that is involved or not depending on the route you want to take.

What exactly do you need the ratios for? If it's for a 71c conversion I can flick you a copy of the tutorial. It's about 11mb tho, so can't post up here, I'll need to convert to text friendly version

#6 bluerat

bluerat

    Senior Member

  • Members
  • PipPipPipPipPip
  • 540 posts
  • Location:Tassie

Posted 11 July 2010 - 11:40 AM

Other than a 240K 4 speed, they are the closest ratio's Datsun made in a factory box. Slipping in a 76 hey Lurchy? What you really need buddy is a LD crank if you want to go fast....

#7 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,661 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 11 July 2010 - 12:53 PM

Whittie, we already have an article on that subject:
http://www.viczcar.c...pic,3210.0.html

Hodgo, what ARE you on about? ???

#8 bluerat

bluerat

    Senior Member

  • Members
  • PipPipPipPipPip
  • 540 posts
  • Location:Tassie

Posted 11 July 2010 - 04:58 PM

LOL sorry, looks like I was way off target! I was talking cams and wanting to keep it on the boil...

#9 haul

haul

    Advanced Member

  • Members
  • PipPipPip
  • 73 posts
  • Location:Townsville

Posted 11 July 2010 - 05:51 PM

This is what I got out of the book I have.                    Found this one , FS5W71B

  260/ 2 seat            260/ 2+2                               
1st  2.957:1            2.906:1                                                  3.321:1
2nd  1.857:1            1.902:1                                                  2.077:1
3rd  1.311:1            1.308:1                                                  1.308:1
4th  1.000:1            1.000:1                                                  1.000:1
5th  0.852:1            0.864:1                                                  0.864:1
rev  2.922:1            3.382:1                                                  3.382:1

Tony

#10 mossy

mossy

    The 1000+ club

  • Members
  • PipPipPipPipPipPip
  • 1,777 posts
  • Location:Melbourne

Posted 14 July 2010 - 08:22 PM

Even though I've rebuilt a gearbox before like the rest of my mechanical knolwedge its very limited, thats where I'm confused about close ratios, I've got an early 71a gearbox which pretty much fells like its in neutral even though its in gear so I want something thats a lot closer together between gears, is this what a close ratio is or am I way off?

#11 dat2kman

dat2kman

    The 2000+ club

  • Members
  • PipPipPipPipPipPipPip
  • 4,061 posts
  • Location:Newport Waters Qld
  • Tagline:going sailing, see ya later!

Posted 09 September 2010 - 08:31 PM

This is what I got out of the book I have.                    Found this one , FS5W71B

  260/ 2 seat            260/ 2+2                               
1st  2.957:1            2.906:1                                                  3.321:1
2nd  1.857:1            1.902:1                                                  2.077:1
3rd  1.311:1            1.308:1                                                  1.308:1
4th  1.000:1            1.000:1                                                  1.000:1
5th  0.852:1            0.864:1                                                  0.864:1
rev  2.922:1            3.382:1                                                  3.382:1

Tony


Not quite,
the list on the left is early 240 z 3 peice, also used in datsun Sports 2000's known as a 71A
the list in the middle is early 260z known as a 71B
the list on the right is late 260z,  some 280ZX pretty well all 240k's, early Skylines, most L20b engined bluebirds etc, it has the big gap between 2 and 3 also known as a 71B
there is a early 280zx box that has a 3.06 first, and some truck/commercial boxes have 3.59 first, this was done by altering the input drive/driven ratio gearset by a tooth or two.
The later RB type boxes are the sameratio ( except fifth gear) as the later 71B box, but with internal differences for strenght and other shizz.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users