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Talking about 1980s trucks.
I've been in half ton trucks ranging from 4.55s to 2.73s for axil gearing.
Comparing 2, 2 door short bed 2wds.
I'd expect mid to upper 20s from a inline 4sp with 2.73s with smaller/lighter then stock tires/rims, with no cargo.
The same truck with the same inline engine, with 4.11s and a 3speed auto will be hard pressed to get over mid teens. Mix in some larger tires and try and run 75+ your going to be lucky to get over 14.
At least in fords 1980/1996~ the 2.73 are 2wd only. 4wds are limited to 3.08 and up.
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1 86 T\D trooper with rare GEN 3 rods TRANS FIXED  NOW DD
1 86 4WD 5sp pup is 2.3L gas, but plan on 2.2L diesel repower
1 91 trop, long term plan is a group buy of imported Isuzu 4JB1-T 2.8L I-4 engines, hoping to get price down to 2K not 3K plus
1993 sidekick my MPG toy, epa rating 26.
i get 29/31 with stock drive train.
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