Re-gearing - What gears? - Ford Powerstroke Diesel Forum

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post #1 of 47 Old 12-13-2009, 10:43 AM Thread Starter
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Re-gearing - What gears?

I run 38x14.50 and wanna make it easier to turn them and pick up speed since I wont ever need to or see me having to drive anything over 90 mph if that.

What gears are some of you with bigger tires running in front and rear and what would you recommend for me?

I don't even know how much the gears will cost or what brands to get. When I had my trans am I got factory gm gears because they were stronger.

I have heard with some suv's and trucks that had 3.73 and went to 4.10/11 got a little better mileage.

Any help and advice would be much appreciated.

8" Lift
38" Toyo MT's
DIY Traction Bars
Zoodad-AIH Delete-Foil Delete
Adjust. Wastegate
ISSIPRO Performax Gauges
4" TB Magnaflow Exhaust w/ 5" tip
AFE stage 2 PG 7 W/Pre-Filter
Superchips Prgmr 150HP/225TQ
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post #2 of 47 Old 12-13-2009, 10:48 AM
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with 38's you should run 4.30's or even 4.88's
i run a 4.30 and my rear tire is about 32" tall. it revs a little high but not much. about 250 rpms more than 3.73's
i like the 4.30 a lot. when i had my old truck with 38's, my guy told me to run 5.13's but thought that was high. he said it would put my rpms about normal.

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post #3 of 47 Old 12-13-2009, 10:52 AM
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id go at least 4:30

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post #4 of 47 Old 12-14-2009, 11:18 AM Thread Starter
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So min. of 4:30 to help and maybe a little lower gear than that. Appreciate the info so far.

8" Lift
38" Toyo MT's
DIY Traction Bars
Zoodad-AIH Delete-Foil Delete
Adjust. Wastegate
ISSIPRO Performax Gauges
4" TB Magnaflow Exhaust w/ 5" tip
AFE stage 2 PG 7 W/Pre-Filter
Superchips Prgmr 150HP/225TQ
Oil X-over Line
Smoked Lights w/LEDs & HIDs
DIY 3 stage Water/Meth
CCV
6.0 IC
Transgo Shift Kit
Derale Trans. Frame Rail Cooler
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post #5 of 47 Old 12-14-2009, 12:51 PM
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I think a 4:56 would be better for 38 inch tires

2011 6.7 F350 - Dads
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post #6 of 47 Old 12-15-2009, 11:21 AM Thread Starter
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Quote:
Originally Posted by 07stroker View Post
I think a 4:56 would be better for 38 inch tires
Even on highway and freeway?

8" Lift
38" Toyo MT's
DIY Traction Bars
Zoodad-AIH Delete-Foil Delete
Adjust. Wastegate
ISSIPRO Performax Gauges
4" TB Magnaflow Exhaust w/ 5" tip
AFE stage 2 PG 7 W/Pre-Filter
Superchips Prgmr 150HP/225TQ
Oil X-over Line
Smoked Lights w/LEDs & HIDs
DIY 3 stage Water/Meth
CCV
6.0 IC
Transgo Shift Kit
Derale Trans. Frame Rail Cooler
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post #7 of 47 Old 12-15-2009, 07:07 PM
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Quote:
Originally Posted by Thrill Seeker View Post
Even on highway and freeway?
yes cause it will relieve a lot of stress off your motor and tranny and will put you closer to your correct rpm's and speedo being right. 6.0's have a higher redline so a bigger gear than a 4.56 would be ok on the e way. like i said, my 4.30 revs at 2250 at 70 mph on the e way and my rear tire is about 32" tall

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*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 #8 of 47 Old 12-15-2009, 07:30 PM
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ya 4.56 is nice. I run them w my 37s. You can still do 90 if you want. you will beturning like 2600 rpm. made big difference on exhaust temps and is easier for the internal trans parts. Pretty good mod.

However my speedo is still off about 10mph. didnt change it at all. I thought it would but it didnt.

Built engine, rods, pushrods, cam, springs. Meth, turbo, injectors, fuel system, oil system. 3 disk billet, billet shafts built trans, 6.0 IC, exhaust, intake. Latter bars, gears, system, tint, HIDs. You know the typical stuff to make a 7.3 get out of its own way... dont brake.

Last edited by OregonStroker; 12-15-2009 at 07:35 PM.
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post #9 of 47 Old 12-16-2009, 06:18 AM Thread Starter
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I was looking at my rpms this morning while driving at 70mph and it was about 1750 give or take and 75mph was about 1900 give or take. I'm not sure what gears are in the truck right now. There has to be a way to figure it out without tearing it apart right? I don't know if I wanna be running that high of rpms with 4.56s and with more highway driving, 4.30s sound more efficient to me.

8" Lift
38" Toyo MT's
DIY Traction Bars
Zoodad-AIH Delete-Foil Delete
Adjust. Wastegate
ISSIPRO Performax Gauges
4" TB Magnaflow Exhaust w/ 5" tip
AFE stage 2 PG 7 W/Pre-Filter
Superchips Prgmr 150HP/225TQ
Oil X-over Line
Smoked Lights w/LEDs & HIDs
DIY 3 stage Water/Meth
CCV
6.0 IC
Transgo Shift Kit
Derale Trans. Frame Rail Cooler
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post #10 of 47 Old 12-16-2009, 07:56 AM
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i would go 4.56.... its not too low and not too high... if you go too low like 4.88 your rpms at 70mph will be at around 2100-2200.. you want to keep that close to 2k as possible or you will get crapy highway mpg...

i can get you a deal on a set of gears and master install kits if you want...

-Raul
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