Best Diff ratio

[HJsandman75]

I'm looking to get my diff overhauled and want to ask what the best diff ratio is for a 308 coupled to a M21 gearbox on standard 14" wheels?
My ID plate states states GV4 which is 3.36:1
Currently my ute has a 3.55:1 open wheeler but I have a 3.08:1 LSD at home in the shed. I want something that is nice to drive and not rev its head off at 100kms (like the 3.55).

Any one have any thoughts on this?

[Innuendo]

It's always a compromise. Put a 3.36:1 in and you match what Holden decided was best. Go 3.08:1 and you lose some off the mark speed but drop the RPM at highway speed improving fuel economy. The fact you have the 3.08:1 LSD already and you want to drop the cruising RPM I think the answer is in front of you.

[Valencia]

Go the 3.08 lsd they work fine with that combo

[Vombil]

ive had a 308 m21 with 3.55 and it is a total bucket of shit combo. i cant see 3.36 being that muych better

[HJsandman75]

Thanks guys, you have confirmed my thoughts, 3.08 it is.

[wbute]

3:08 LSD for sure. Unless you want to swap for my 3:36??

[Valencia]

ive had a 308 m21 with 3.55 and it is a total bucket of shit combo. i cant see 3.36 being that muych better

Now if you had a 202 with triples that 3.55 would be perfect

[agr071]

I had a 2.78 in mine, but because of the roof spoiler creating soooooo much drag, i've put the 3.08 back in. Haven't driven far enough yet to decide.

[Big Rob]

Yep.... 3.08 is a good choice unless you are in the middle of the city with traffic lights at every intersection.