98 rear end - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

insco13 · 09-07-2012, 06:59 PM

whats the best rear end to run with my rb25. I want to get the rpms down onn the freeway. I've heard that the j30 diff is the one i want. I have my stock se diff and at 80 im up in the 4000 rpms range.

xxjohns14xx · 09-07-2012, 07:12 PM

stock is like a 4.01, j30 is like a 3.7, and a q45 diff is like 3.4 and will work on a s14 with some modification.

xxjohns14xx · 09-07-2012, 07:14 PM

with a j30 your rpms at 70 maybe will lower 250 rpms.

09-07-2012, 06:59 PM	#1
insco13 Join Date: Aug 2006 Location: Columbus, Ohio Age: 51 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	98 rear end whats the best rear end to run with my rb25. I want to get the rpms down onn the freeway. I've heard that the j30 diff is the one i want. I have my stock se diff and at 80 im up in the 4000 rpms range.

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09-07-2012, 07:12 PM	#2
xxjohns14xx Leaky Injector Join Date: Sep 2011 Location: mobile, al Age: 33 Posts: 67 Trader Rating: (4) Feedback Score: 4 reviews	stock is like a 4.01, j30 is like a 3.7, and a q45 diff is like 3.4 and will work on a s14 with some modification.

09-07-2012, 07:14 PM	#3
xxjohns14xx Leaky Injector Join Date: Sep 2011 Location: mobile, al Age: 33 Posts: 67 Trader Rating: (4) Feedback Score: 4 reviews	with a j30 your rpms at 70 maybe will lower 250 rpms.