[Aussie Mike]

Hi BnB,

I think most gearboxes are rated by torque rather than HP. Most of the standard T56 boxes are rated at 450ft/lb and there is a heavy duty version rated at 550ft/lb. To give you an indication of how this fits with other boxes on the market the Tremec TR3550 is rated at 375ft/lb, the TKO is rated at 425ft/lb and the TKOII is rated at 475ft/lb.

Going by the motors people have been puting in front of the Tremec 5 speeds (TR3550,TKO and TKOII) at 450ft/lb rated I don't think the T56 is going to have any trouble with whatever you throw at it.

Remember the T56 is the box Dodge chose for the V10 in the Viper and they aren't short on either torque or HP.

Is there any torque rating info available on the Richmond box you are running?

Cheers