With the price of fuel these days I'm wondering if the addition of free spin hubs would be worth the cost.A 15% increase in mileage would save me about $750 a year in fuel.This mod would pay for itself pretty quick.

 

it will take awhile to recoup your investment- i did the lock out hubs when i redid my whole entire front end- ball joints, axle u-joints, tie rods, steering shaft,dss bar, steering stabilizer, steering box,brakes,etc,etc, i picked up about a 1-1.25 mpg gain. this gain is 50-50 driving. i would assume i would pick up a little more if i was strictly on the highway all the time.

 

Mostly hwy here picked up 2mpg with the hubs.

 

One of the best mods I've done, but if you're looking at it for a pure mileage gain, you'll be disappointed.

Sid

 

My buddy just had a Gearvendors and Freespins installed. San Diego to Death Valley in his '07 reg.cab,G-56,285's and popup camper netted him 19.6. That is an increase of 4.5mpg. Probably a combination of the two improvements did it. Engine is stock. The guy can now go 80mph@1800rpm.

 

best mod ive done also, really love low 2 wheel reverse , only seen about 0.5 mpg increase but i tow heavy

 

I am having Dynatracs installed on Friday, along with a trussed axle, and a locker. Ill chime in again once I get some miles on it to see if theres any improvement. I average around 14 mpg at the moment with mostly city.

 

i love my ems kit....install went very easy and ive put 20k miles on it so far...nice increase in mileage and the 2wd low is NICE