3.7 diff in sv6 manuel or 5 speed auto

[Oliverjames]

Is there any one out the that has done the 3.7 diff mod to a sv6 that could answer some questions for me ??

 

[vongy10]

I've put 3.7 diff gears in my manual SV6.

 

[Oliverjames]

Just wondering what engine revs at 100kmh Fuel usage cruising up highway and roughly top speen in each gear ? Could help me decide thanks

 

[vongy10]

Dunno about fuel economy and top speed but it sits just under 2000rpm at 100kph and threw the speedo off by 10-15kph.

 

[07GTS]

to work out rpm at set speeds when changing a diff ratio just divide what ever rpm by your diff ratio now then multiply it by the new diff ratio and that is the revs at that same speed...

 

[vongy10]

Anybody know how to get the speedo re-calibrated? It's unnerving driving around with the speedo 10-15km over the actual speed.

 

[07GTS]

are u sure its out, the only thing that can change the speedo reading in ve is wheel size since they use the abs sensors so everything before that dosnt make any difference, if it is that far out then it prob was all the time which is odd for a ve and i dont think there is much that can be done...

 

[Oliverjames]

It can be done by most Holden dealers