Need help with gear selection - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 19 Old 03-29-2008, 09:47 PM Thread Starter
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Need help with gear selection

I have an 03 f-250 6.0 with the complete edge system intake exhaust with 6 inch lift with 37 inch tires and i can get a GREAT deal on a set of 4.56 gears would this benefit or hurt me i really need all the help i can get thanks alot

"Daniel" 03 f-250 6.0 complete edge system Intake system 4 inch turbo back exhaust custom grill six inch skyjacker lift all springs triple shocks front traction bars 37inch tires etc...
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post #2 of 19 Old 03-29-2008, 09:51 PM
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get them....don't think....just get.....your tranny will thank you....your fuel mileage will thank you.
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post #3 of 19 Old 03-30-2008, 08:54 AM Thread Starter
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Thanks alot

"Daniel" 03 f-250 6.0 complete edge system Intake system 4 inch turbo back exhaust custom grill six inch skyjacker lift all springs triple shocks front traction bars 37inch tires etc...
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post #4 of 19 Old 03-30-2008, 09:02 AM
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i wouldnt do 4.56 i would recomend stickin with 4.30's cause they are a ford gear. i heard alot of bad about the 4.56. i have a 4.30 in mine and like it alot but i have to keep it under 65mph cause of mileage. at 60 mph im at 2000 rpm.

05 Single Cab Short Bed
*03 Turbo*Stroked Injectors*AFE Stage 2*Small mouth Intake*SCT With Eric's Extreme Race*4.30 Gear*Best ET 13.5@99MPH*
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post #5 of 19 Old 03-30-2008, 09:11 AM Thread Starter
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but even with the much bigger tires you still dont think it will be good

"Daniel" 03 f-250 6.0 complete edge system Intake system 4 inch turbo back exhaust custom grill six inch skyjacker lift all springs triple shocks front traction bars 37inch tires etc...
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post #6 of 19 Old 03-30-2008, 09:15 AM
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I have 4.56's, no problems here.

I recommend you do 4.56's,...it will help with the "rotational mass" of the 37" tires....which will increase your fuel mileage, be easier on your tranny, and give you your low end power back.
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post #7 of 19 Old 03-30-2008, 09:29 AM Thread Starter
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What kind of speed can you get up to?

"Daniel" 03 f-250 6.0 complete edge system Intake system 4 inch turbo back exhaust custom grill six inch skyjacker lift all springs triple shocks front traction bars 37inch tires etc...
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post #8 of 19 Old 03-30-2008, 09:41 AM
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When you re-gear to 4.56's...it will bring you almost perfectly back to stock rpm's

stock is 3.73 and a 30.5" tire.....or 3.73 and 31" tire....so stock rpms are around 2660
If you put in 4.56's with 37" tires...your rpms will be around 2692...which is almost exactly the same as stock.

remember ,...you need a little more "UMPHFFF",...because of the larger, heavier tires.







do you tow?

.

Last edited by TANK'S 250; 03-30-2008 at 09:45 AM.
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post #9 of 19 Old 03-30-2008, 09:55 AM Thread Starter
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yeah i do sled pulls on occasions

"Daniel" 03 f-250 6.0 complete edge system Intake system 4 inch turbo back exhaust custom grill six inch skyjacker lift all springs triple shocks front traction bars 37inch tires etc...
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post #10 of 19 Old 03-31-2008, 07:47 PM
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i went up to the 4.30 gears in my excursion from 3.73. it was just fine. 70 mph was about 2300 rpms. i think the 4.56's might be a little too much. but that is my opinion.

2005 Excursion Powerstroke
upgraded FICM
Bully Dog GT

1997 F350 Crew Cab
lifted w/ 35" Goodyear's
Banks Trans Command, Chip, Gauges
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20" Goliath wheels w/ 37" Toyo MT's
manual transmission
4.56's
AFE cold air intake
8" fabtech
magnaflow exhaust
Edge Platinum Juice programmer

SOLD - 2005 Excursion Powerstroke
6"lift w/ 37's
turbo back exhaust
edge evolution
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