Mopar Muscle Association UK

can anyone suggest best axle ratio for a 69 gto.it has well built 400 with auto,would be used mostly for shows but some rwyb.engine is balanced,forged pistons,ported heads and .480 lift cam,dual plane manifold etc.it has 3.08 gears at the moment,any info/ guidance greatly received,thanks

if available go with around the 3.50 to 3.70 ratio

cheers cannonball,thought that might be the case.i have got to convince him now

Dear Mrs Longshot.

If you tell me what speed you want best petrol mileage at (i.e. 70mph),

The duration of your camshaft,

And the exact size of your rear tyres

I can work out an axle ratio to best suit.

Whats the betting it works out the same as Duncs suggestion?

3.08 is good enough.

3.23 is better.

I think there is a 3.54, and a 3.73.

Depends what axle is in it. I assume it will be a corporate 10 bolt, and not a Chevy 10 bolt or 12 bolt. Corporate axle stuff used to be difficult to get bits for, but I think it is a lot better now. The coporate axle doesn't used C-clips, which is a big advantage.

Remember, it isn't a MoPar so it doesn't need so much gearing assistance to get it off the line

cheers for the replies gents,i have let chris know what you have suggested.dave-thanks for offer to work out ratio-i am not seeing him till friday so i will post dimensions etc then.ps only mrs longshot at the weekend

Hi Longshot,

Done a few Pon400's, and that looks like a lot of cam to me!
Need the tyre height to do a proper Calc.
But nearer to 3.90's will do the BIZ on da strip!

How's the Main bearing hunt going?

Best wishes Baccman.

sorry,only just checked this post,i am putting bottom end together tonight on said vehicle and will measure tyre height while i am there.the bearing hunt is on going but have a nasty feeling i binned em by mistake cheers backamaruda,dave

LONGSHOT wrote:ps only mrs longshot at the weekend

We used to have a club member like that (still a member and reading this?) called Space Nuts? So called because there is a space where his nuts used to be.

Steady Dave, I reckon thats one road you will probably be thanked for not going down

. thanks again for your all your info-he has decided on 3.55 gears as most miles are to shows.keep an eye out at nats for a black gto been tryin to get him to run it up the strip for ages!