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06-25-2013, 01:36 PM #1
Better fuel economy with front output shaft (drive shaft) removed?
Riddle me this..
Getting ready to do 1200 miles on my 99 suburban with a NP246 auto-trac transfer case. I have the front drives shaft out now to get a u-joint replaced which got me to thinking. Would I see an increase in fuel economy if I left it out for the trip? The front output shaft spins constantly with the auto-trac transfer case, however I understand that there is no "power" being sent to the front wheels.
And yes, I'm doing most of the basic tune-up stuff right now that will REALLY make a difference, including:
New O2 sensors
New distributor cap/rotor
New air filter
Seafoam throttlebody treatment
A/C fixed (yea for A/C!)
I can't think of any reason why I would need to have it in.
Last edited by Family Force 6; 06-25-2013 at 02:20 PM.Current Rides: |99 Chevy Suburban- the family truckster |93 Lincoln Town Car- 250K miles & still churning -now a fan of the Panther platform |95 BMW 325is coupe- Wheeee!
Former GM cars: |78 Suburban 454 |71 Buick Electra 225 (deuce & a quarter) |75 Monte Carlo- 400SB- heaviest doors GM every made |70 Impala coupe- my 1st car
06-25-2013, 02:11 PM #2
I would say no... plus it could mess with the transfer case... your allowed to shift into 4WD up to 25mph and if the front input/output is not spinning like it should be the computer could have a fit
best way to boost your MPG is an intake, and delete the mechanical fan for a good electric one.Gas was $1.83 when Obama took office.....
06-25-2013, 02:22 PM #3
I've heard mixed things about the benefits of an air intake. What's your experience been as far as fuel economy gains and what brand did you use?
06-25-2013, 02:30 PM #4
I got a simple K&N intake. not the big tube 57 series.
this works best for my old engine. i gained HP and MPG (one more than the other depending on how i drive)
also lets me hear the engine better too.
as for the fan
I put mine in, in an afternoon.
with a 160 thermostat it runs perfect, even with the noticeable gap between the fan and the stock shroud.
i may cut an inner tube to fill it later though.... but for now, its fine. i don't even run it when im at highway speeds
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