As for the T56 Prices
Secondhand $2500.00
Full Reco $3500.00
From Ballarat Holden Surplus Division Ph 03 5338 0319
As for rpm my vy ss with 3.46 and 245/40/18 is doing just over 1500rpm at 110kms
Depending on the tyre and rim size you use it would be between 1500 to 2000rpm