New gears? Or a boost cooler? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 33 Old 12-25-2012, 04:12 PM Thread Starter
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New gears? Or a boost cooler?

Hey folks and Merry Christmas. My 05 doesn't like to run on the highway at 55 or faster. I have 38 inch swampers and the stock 3.73 gears. The truck shifts into high gear and the rpms drop and the EGTs go steadily from 800 to over a thousand til I have to hit the tow/Haul button and they drop back below 800 but the RPMs shoot up to over 2200. My Innovative tunes on the SCT are programmed with my stock gears and 38.2 inch tires but is it just too much for the programming alone? Should I step up to a 4.56 or 4.88 gear?? My next option I guess would be to get a Snow injection kit and just ice down the EGTs when it gets hot and doesn't wanna down shift. Anyhow, I appreciate all the responses and recommendations.

05 EX Cab Short
8 inch Fabtech
38 inch SSRs on 17x10 Centerlines(powdercoated)
SCT Innovative tunes
Banks CAI
Offroad MBRP Stainless 4.5 " and up pipe.
Auto Meter EGT, Fuel pressure, Trans Temp, Oil temp, water temp gauges.
Blue spring , bored 3 hole banjos.
ARP Studs
OEM Ford gaskets.
EGR Delete, cooler delete.
Bulletproof stand pipes
AMP Power Steps
Kicker Audio
Yukon 4.56 gears
Innovative 48v FICM Performance flash.
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post #2 of 33 Old 12-25-2012, 04:15 PM
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Gears!

It will ease the strain on the rest of your drivetrain.

'06 F250 FX4 6.0L/auto-studded, O-ring'd, deleted, turbo'd, inject'd, lifted.... typical bolt on
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post #3 of 33 Old 12-25-2012, 06:09 PM Thread Starter
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[QUOTE=gotta_gofast;3410954]Gears!

It will ease the strain on the rest of your drivetrain.[/QUOTE

Thanks! What ratio would work better. 4.56 or 4.88? I don't tow very often.

05 EX Cab Short
8 inch Fabtech
38 inch SSRs on 17x10 Centerlines(powdercoated)
SCT Innovative tunes
Banks CAI
Offroad MBRP Stainless 4.5 " and up pipe.
Auto Meter EGT, Fuel pressure, Trans Temp, Oil temp, water temp gauges.
Blue spring , bored 3 hole banjos.
ARP Studs
OEM Ford gaskets.
EGR Delete, cooler delete.
Bulletproof stand pipes
AMP Power Steps
Kicker Audio
Yukon 4.56 gears
Innovative 48v FICM Performance flash.
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post #4 of 33 Old 12-25-2012, 06:24 PM
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What was your stock tire size? Here is a chart.
http://www.alloyusa.com/gear-ratio-calculator/


Last edited by dhanna6powerstroke; 12-25-2012 at 06:38 PM.
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post #5 of 33 Old 12-25-2012, 06:28 PM
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Tire & Gear Ratio Chart at Morris 4x4 Center

this chart is pretty accurate i know our final drive ratio in our trannys is higher then the chart predicts so the rpms it shows arent right but the gear ratio to tire size will still convert the same.

I would say 4.56 should keep about the same final drive ratio as stock tires with 3.73 gears. Just my .02c

Tony

2005 F250 crew cab lariat,

4" lift 325/65/18 tires, head studs, built trans, egr delete, powermax turbo, 58v ficm from swamps with mild flash, 4" straight pipe, sct with innovative xtreme street and race tune's, blue spring upgrade

Stage 3, 190/100 injectors, and full fuel system on the way.
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post #6 of 33 Old 12-25-2012, 06:34 PM Thread Starter
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Thanks for the chart. Looks like 4.56 will be the best bet. Not sure what my stock tire size was.

05 EX Cab Short
8 inch Fabtech
38 inch SSRs on 17x10 Centerlines(powdercoated)
SCT Innovative tunes
Banks CAI
Offroad MBRP Stainless 4.5 " and up pipe.
Auto Meter EGT, Fuel pressure, Trans Temp, Oil temp, water temp gauges.
Blue spring , bored 3 hole banjos.
ARP Studs
OEM Ford gaskets.
EGR Delete, cooler delete.
Bulletproof stand pipes
AMP Power Steps
Kicker Audio
Yukon 4.56 gears
Innovative 48v FICM Performance flash.
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post #7 of 33 Old 12-25-2012, 06:58 PM
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Yea I would recommend the 4.56s as well. You'll have a slightly lower mechanical advantage with the 38s and those gears as opposed to stock gears and stock tires due to the excess weight of the 38in tires but the drive ratio should be very close and the tuning should more than compensate for the lack of anything else.

Nate
2006 F350 (BACKYARDIGAN) - 67mm Turbo, 215/85 injectors, WPE intake manifold, NB/Warren Trans, and more stuff that I don't care to mention....
2006 F250 (LITTLE DURTY) - WPE Manifold, Up-pipes, EGR delete kit, and Tuned By ME
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post #8 of 33 Old 12-25-2012, 09:02 PM
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A 4.56 gear is what you want. Leave the stock speedo pick up on the differential and when you're done, you're speedo will be close to your gps MPH.

sent from a dumb guy with a smart phone

Karl and his 2003 6.0

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WHAT!?! I was trying to list stuff that everyone else
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post #9 of 33 Old 12-25-2012, 09:31 PM
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456 gears!

Oliver
6.0/6.4 Ported intake manifolds, turbos, air intakes, fuel systems and much much more!!!!
ODAWGS DIESEL PERFORMANCE
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post #10 of 33 Old 12-25-2012, 11:49 PM Thread Starter
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Would 4.88 be too high? I might be able to get a set for a little cheaper from a guy I know.

05 EX Cab Short
8 inch Fabtech
38 inch SSRs on 17x10 Centerlines(powdercoated)
SCT Innovative tunes
Banks CAI
Offroad MBRP Stainless 4.5 " and up pipe.
Auto Meter EGT, Fuel pressure, Trans Temp, Oil temp, water temp gauges.
Blue spring , bored 3 hole banjos.
ARP Studs
OEM Ford gaskets.
EGR Delete, cooler delete.
Bulletproof stand pipes
AMP Power Steps
Kicker Audio
Yukon 4.56 gears
Innovative 48v FICM Performance flash.
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