t56 / m12

[vutess]

G'day blokes and lady's ofcourse.

well i bought a m12 box, and puttin it in my vu in a couple of days, just checking, will it bold straight in?? cheers

[janhdt]

Cant See Y Not

[vutess]

yer just i know that they weigh less so yer is that just internal or casing loss just want to make sure before i try slap it in. anyone with this box know will i feel the difference in ratio much??? cheers

[Ryzz]

Is your VU Already a manual, if so there is not that much point in changing the g/b. Runs very similar if not the same ratios. Might be a little stronger though, that being said i havnt heard of to many people killing the T56 with some grunt going through them.

[vutess]

yer it is a manual, however the box is very dead, had a half engaging clutch and couldnt change it for a while driving like that has fkd the box, so yer had to be replaced. someone said they are like running 3.7 diff gears? anyone else comment on this, and also does anyone really know if the box will bolt straight in or all assumptions like i had untill now.

[Dacious]

The M12 box as fitted to VZ Monaro and HSVs has lower 1-2-3 and 5,6 gears. Fourth is direct 1:1 So it should be snappier off the mark, and pull top (0.73 I think instead of 0.5:1) better. They supposedly had better/more synchros on the low gears for snappier shifts. I don't think it would be like having 3.7 gears, but moving off the mark with 3.46s should be easier.

My bet is it will basically bolt up except the clutchplate spline may be different. You would need to get a Holden or Repco parts person to check for a different part number between VZ Monaro and VZ SS. Might be worth fitting a better shifter, too.

[10sec_rx7]

same splines,

totally different ratios, it will be like having 3.9's in your car,

[Ryzz]

same splines,

totally different ratios, it will be like having 3.9's in your car,

Stand Corrected, thx Dale :doh:

[vutess]

cheers fellas, yer putting it in tomorrow arvo cant bloody wait car has been out of action for a while now, yer found a calculator on the net to work it all out, is pretty much all the same as 3.9's however 4th gear is still the same as regular t56 so dont know how this will effect the 1/4 mile time and driving but yer find out, should b ok

thanks again will let ya know how it feels