355 to 308 ratio?

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355 to 308 ratio?

04-15-2022, (Subject: 355 to 308 ratio? )

Post: #1

earnies2 Offline

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355 to 308 ratio?

I have a 2009 prostar ISX 485, 13 over 355 rears on 22.5 low tires.
If I drive 55 mph the truck gets decent fuel millage 7.5 - 8 if I drive 62-65 millage goes in the toilet to 5 mpg.
If I change both rearends to 308's what can I expect for road speed and millage?

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Messages In This Thread

355 to 308 ratio? - earnies2 - 04-15-2022

RE: 355 to 308 ratio? - tree98 - 04-15-2022,

RE: 355 to 308 ratio? - earnies2 - 04-16-2022,

RE: 355 to 308 ratio? - Rawze - 04-16-2022,

RE: 355 to 308 ratio? - Kw9006nz - 04-15-2022,

RE: 355 to 308 ratio? - earnies2 - 04-16-2022,

RE: 355 to 308 ratio? - Rawze - 04-16-2022,

RE: 355 to 308 ratio? - tree98 - 04-16-2022,

RE: 355 to 308 ratio? - earnies2 - 04-16-2022,

RE: 355 to 308 ratio? - Rawze - 04-16-2022,

RE: 355 to 308 ratio? - JimT - 04-16-2022,

RE: 355 to 308 ratio? - Rawze - 04-16-2022,

RE: 355 to 308 ratio? - Kw9006nz - 04-17-2022,

RE: 355 to 308 ratio? - Waterloo - 04-18-2022,

RE: 355 to 308 ratio? - Precisionw900 - 04-26-2022,

RE: 355 to 308 ratio? - JMBT - 04-26-2022,

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