VHR + FD Gear Ratio upgrades - 3.9 and 4.08

javol · 08-13-2009, 03:23 PM

I live in Chile, no 370Z here yet, few 350Z, no Z-culture, help me US mates!!!

1) I'm going to change the final ratio of my imported (from USA) 7AT 370Z to 4.08, wich i read is "stock" on Nissan Frontier.

2) Change the whole diff is the only way to go with?

3) Is it not enough to buy an OEM Frontier pinion-ring couple?

4) If yes, anyone knows how many parts are necessary (any bolts?) and the serial # of each of them?

Thank you in advance!

The Arp · 08-14-2009, 01:37 AM

So, does anyone know where the syncro rev match gets its speed signal to match the engine speed? If it is from the tranny itself then changing the rear end ratio won't affect it right? The reason I ask is, I think changing the ratio on my 6 speed to 4.08 is next on my list since I really only drive my car for fun and the occasional errand. I auto-crossed it last weekend and the car is just a little weak coming out of the slower corners in second and this would be a very stealthy way to fix that. Now I just need to find a shop in the SFV to do the swap and get approval from my "boss".

wstar · 08-14-2009, 01:49 AM

Quote:

Originally Posted by The Arp

So, does anyone know where the syncro rev match gets its speed signal to match the engine speed? If it is from the tranny itself then changing the rear end ratio won't affect it right?

SRM is based solely on the engine RPMs and the gear ratios in the 6MT. Your rear diff ratio can't affect it. Changing out gears in the 6MT would though.

08-14-2009, 01:37 AM	#2 (permalink)
The Arp Base Member Join Date: Jul 2009 Location: Simi Valley Posts: 38 Drives: 2009 370z white m6 Rep Power: 17	So, does anyone know where the syncro rev match gets its speed signal to match the engine speed? If it is from the tranny itself then changing the rear end ratio won't affect it right? The reason I ask is, I think changing the ratio on my 6 speed to 4.08 is next on my list since I really only drive my car for fun and the occasional errand. I auto-crossed it last weekend and the car is just a little weak coming out of the slower corners in second and this would be a very stealthy way to fix that. Now I just need to find a shop in the SFV to do the swap and get approval from my "boss". Last edited by The Arp; 08-14-2009 at 09:52 AM.

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08-13-2009, 03:23 PM	#1 (permalink)
javol Base Member Join Date: Apr 2009 Location: Chile Posts: 20 Drives: 370Z 7AT Touring Rep Power: 18	I live in Chile, no 370Z here yet, few 350Z, no Z-culture, help me US mates!!! 1) I'm going to change the final ratio of my imported (from USA) 7AT 370Z to 4.08, wich i read is "stock" on Nissan Frontier. 2) Change the whole diff is the only way to go with? 3) Is it not enough to buy an OEM Frontier pinion-ring couple? 4) If yes, anyone knows how many parts are necessary (any bolts?) and the serial # of each of them? Thank you in advance!