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Coug just wow. Thanks for the information. Augi thanks as well. This truck has a 6.5 and 4 speed from another truck (newer truck)........will be getting a turbo put on it. I'm thinking with the 6.5 and especially the turbo the 2.56 will be good especially going 70-75 mph. Augi I don't...

Another question..........if the truck isn't used for hauling or heavy loads and I want better highway cruising.........the 2.56 is best gear ratio?? I think it will affect the 'take off' by being slower (especially if heavy).......but better top end. Correct?

From a thread post from RetiredWarHorses.........maybe this is the answer. Easier is too tell what model year the truck is... 85-94 A0-A1 have 2:56 all A2’s have 2:73 ECV on up, 3:08

Can anyone confirm the gear ratios used in the differentials and when they were changed?? My understanding is they went from 2.56 to 2.73 and then 3.08. But what years were they used/changed?