What gear ratio.

[Dirtman]

What happens if one swaps in a 5.0l Ford engine, or any other v8 engine into a ranger with a stock lower axle gear ratio?
Would that impact on the differential also?

Zilch. Rpm/gearing/tire size is constant.

 

[cbxer55]

Using 3.27 ratio you better have friends to help you push start the truck and always drive down hill...

That would make the saying FORD, Fooker's Only Run Downhill, true. LOL!

 

[ThatOneGuy]

That would make the saying FORD, Fooker's Only Run Downhill, true. LOL!

Im still wondering about this because i have this gear ratio in the explorer i drive and its always done what i ask of it climb hills, soft sand, snow. I mean i guess its partly why i cant burn much rubber but thats mostly the clutch that had a little life left 3 years ago lol. Ive never felt like i lacked power. It is a 5 speed though with m5od hd out of a newer ranger.

 

[Roert42]

That really depends. If you do mostly city driving lower gears can actually end up improving fuel mileage since your engine is working alot less at low speeds and taking off from a stop. It'll definitely have the opposite effect cruising on the highway so it really depends on what the truck is gonna be used for.

I went from 3.08 to 3.55 in my F150 last year, picked up 3 mpg and was a lot more pleasant to drive. Only problem was you really didn’t want to drive it above 60-65 before the gear swap, 60-65 was screaming after for sure.

 

[Roert42]

From what vehicle did you source the 4.10 from?

Depends on the transmission, if the transmission has the same gear ratios as stock then it will not effect anything. If your new transmission has totally different gear ratios you may need to adjust the ratio on the diff.

 

[sgtsandman]

A bigger engine or an engine with more horsepower will somewhat compensate for taller axle gearing. If you look at the specs of a lot newer trucks, they tend to have Taller axle gear ratios unless you get certain options or packages. They do it to bump up the fleet mpg numbers and many people’s demands for better fuel mileage.

 

[gaz]

ThatOneGuy,

If you use 235x75R15 with 3.73's you will experience the highest fuel economy and great torque range use. I can not recommend any other tire size with 3.73's in a RBV; that is a perfect marriage and I will.be green, SUPAgreen!!!

 

[Dirtman]

A bigger engine or an engine with more horsepower will somewhat compensate for taller axle gearing. If you look at the specs of a lot newer trucks, they tend to have Taller axle gear ratios unless you get certain options or packages. They do it to bump up the fleet mpg numbers and many people’s demands for better fuel mileage.

Most of those newer trucks have better transmissions with lower first gears and closer ratios so hp isn't really the factor in why they can use higher diff gearing.