LSD j30 vs. s14 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

AKADriver · 02-04-2003, 07:56 AM

On all the S13 and S14 5-speed SR20DET clips I've ever seen, the axle code listed on the firewall tag was "RC40" indicating a ~4.0:1 R200.

Nissan axle codes:
R = RWD
A = R160, B = R180, C = R200, D = R230
## = ratio rounded to the nearest tenth

If you're pulling a diff from a J30 and you're unsure of the ratio, RC39 will be the 3.916:1 box, RC40 will be the 4.083:1 box.

Automatic S13/S14 SR20DETs had the 3.916 ratio.

The 3.692:1 ratio was included with the six speed in the S15.

Here's some proof:

I could find more... anyway, find a shot of an S13 or S14 firewall tag indicating an SR20DET, a manual transmission (FS5W71C), and an axle other than 'RC40', and I'll believe it.

- Ryan, FIREWALL TAG NAZI!

Edit: just an aside... the CA18DET ratio was indeed 4.363:1, manual or automatic. Their tags say 'RC43'.

02-04-2003, 07:56 AM	#1
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,518 Trader Rating: (1) Feedback Score: 1 reviews	On all the S13 and S14 5-speed SR20DET clips I've ever seen, the axle code listed on the firewall tag was "RC40" indicating a ~4.0:1 R200. Nissan axle codes: R = RWD A = R160, B = R180, C = R200, D = R230 ## = ratio rounded to the nearest tenth If you're pulling a diff from a J30 and you're unsure of the ratio, RC39 will be the 3.916:1 box, RC40 will be the 4.083:1 box. Automatic S13/S14 SR20DETs had the 3.916 ratio. The 3.692:1 ratio was included with the six speed in the S15. Here's some proof: I could find more... anyway, find a shot of an S13 or S14 firewall tag indicating an SR20DET, a manual transmission (FS5W71C), and an axle other than 'RC40', and I'll believe it. - Ryan, FIREWALL TAG NAZI! Edit: just an aside... the CA18DET ratio was indeed 4.363:1, manual or automatic. Their tags say 'RC43'. Last edited by AKADriver; 02-04-2003 at 07:59 AM..