Just a question about magnum swap

[REDLNR]

So if a person was to do the swap. Kept the fuel injection. Installed overdrive trans depending on the gears what if any fuel mileage increase could a person see? Thanks. Shawn

 

[DodgeAddict]

I did a carbed 5.9 Mag & 518 in my 77 CrewCab with 4.10's that got a solid 9-10 mpg with it's stock 360/727 & had a top speed of about 75
When I was done it had twice the power,18-19 mpg hwy & top speed over 100 easy
I switched the converter & OD using toggle switches

It got 3 mpg hwy better than the 97 SWB 2WD that the engine came from

I leaned the carb out & got 21 mpg hwy but would burn the exhaust gaskets out on really long trips

 

[Abodybomber]

So if a person was to do the swap. Kept the fuel injection. Installed overdrive trans depending on the gears what if any fuel mileage increase could a person see? Thanks. Shawn

A dynamite combination, done right.We need more info here: What truck (year/ trans behind it/any modifications?). The barrel is sweet,in mild street applications.What car,(if you have one?),will this go in.Let's start there.

 

[player1up]

I'm getting about 15-18mpg around town with my stock 99 5.9/46re/8.8 3.73 swap, but that's just a guesstimate because I stop filling the tank by ear not by hose auto shutoff, AND it's at full throttle more often than not.
Actually better mpg than the old turbo slant and way more consistent.

 

[REDLNR]

I have a 71 demon and a 71 dart swinger. Both 8 3/4. Have 3:55 3:91 4:10 4:30 and 4:56. One will be a street car other will be drag car. It's still a coin toss on which will be what.