1979 280zx diff ratios

[takayuki]

hi,

I'm looking to swap a 3.9 r200 diff in my 240z. I have an opportunity to take a diff out of an 1979 280zx with a 5 speed transmission. I've done some research on the web and i am really confused. Some websites tell me that the '79 has a 3.7 ratio. others tell me its a 3.9. Can someone tell me the straight facts? The diff i'm looking at is a canadian model 280zx.

 

Thanks for your help

[xenonxiii]

From the FSM

 

http://xenons130.com/Differential.html

[naviathan]

That's quite the mix for the 79. I'd like to get my hands on that 3.364 R200 if anyone has one!!

[S30TRBO]

Try this: http://www.geocities.com/z_design_studio/transmission.html

 

Pull down the box under "Choose Rear Differential or Enter Gear Ratio"

[takayuki]

wow, not sure why i couldn't find these! thanks for the help!

[Niku-Sama]

Try this: http://www.geocities.com/z_design_studio/transmission.html

 

Pull down the box under "Choose Rear Differential or Enter Gear Ratio"

 

 

i am not sure what some one did to my car before i bought it but this doesent give the same results in my car.

 

the '79 5spd with the matching rear diff shows about 3500rpm @ 80mph but when i drive the car that fast its turning over about 4500rpm. the only combo on that thats close is if i manually put in a 4.11 gear and 32010-N3222 factory comp transmission, the gearing is pretty close too but that cant be right. first off i am not that lucky and secondly its a 2+2 from and old geezer that acually made dentures!