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**Captainfab** · 04-16-2018, 11:17 PM

If your 383 is a true 425hp, you definitely need a lower gear than 2.73. You're never going to get good mpg's with 425hp pushing a brick down the road, but you should be able to get over 10 mpg.

04-16-2018, 11:17 PM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: Posi Rear End If your 383 is a true 425hp, you definitely need a lower gear than 2.73. You're never going to get good mpg's with 425hp pushing a brick down the road, but you should be able to get over 10 mpg. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE