GEAR ratio? - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 07-22-2012, 02:19 PM Thread Starter
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GEAR ratio?

Ok guys I just installed a set 37-13.50r22 Toyo's on my truck. I went from a 325-50r22(34.5"). My truck currently has 3.73 gears and my question is what would be the best ratio to go to. 4.10 or 4.30? Right now I am at about 1700 doing 70mph. I would like to be at about 2000rpm at 70mph. I don't tow too often but I tow heavy and I run a 250hp tune so I would like to regain some gear and not kill my transmission.

Any experience with this would be superb. Thanks in advance.



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
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post #2 of 25 Old 07-22-2012, 04:24 PM
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Most guys with 37's say that 4.30's are too low. 4.10's would probably be best. My only concern would be that going from 3.73's to 4.10's may not be worth it.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #3 of 25 Old 07-22-2012, 04:33 PM Thread Starter
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Yeah I don't think I would do 4.10s. Does anyone have this setup?



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
strokin07 is offline  
post #4 of 25 Old 07-22-2012, 04:34 PM
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I would be 100% sure before you do anything. Swapping isn't cheap.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #5 of 25 Old 07-22-2012, 04:40 PM Thread Starter
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Yeah most definitely!



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
strokin07 is offline  
post #6 of 25 Old 07-23-2012, 06:22 AM Thread Starter
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I remember seeing a guy on here with a black CCSB, black wheels with 37s I think he has king coilovers up front. I saw he had 4.30 gears. Does anyone know who I am referring to? I saw pics of him with a big a** toy hauled fifth wheel.

Sent from my DROIDX using AutoGuide.Com Free App



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
strokin07 is offline  
post #7 of 25 Old 07-23-2012, 05:23 PM Thread Starter
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bUMPPPPPPP



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
strokin07 is offline  
post #8 of 25 Old 07-23-2012, 06:46 PM
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good question I have similar concern. I have 40s and spartan 210 tune. my gass dropped from 14 to 11 on lie-o-meter.
seem a bit slower off line also even though i dont hammer down very often.
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post #9 of 25 Old 07-23-2012, 07:55 PM Thread Starter
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Yeah I just need to know what RPMs ill be turning at 70 mph with 37s and 4.30s. That's all lol!!!!!!!

Sent from my DROIDX using AutoGuide.Com Free App



2008 F-250 KR
7" ICON
7" PMF blocks
Bilstein 5160F/5100R
22x14 Fuel Octane
37" Toyo M/T
H&S Mini Maxx w/ Gearhead tuning!
5" Diamond Eye
4" Diamond Eye DP
ARP head studs
Custom Stock Intake

RCD converter, HD billet input, low/rev hub, suncoast clutches.
160k miles and counting...
strokin07 is offline  
post #10 of 25 Old 07-23-2012, 10:49 PM
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Quote:
Originally Posted by strokin07 View Post
Yeah I just need to know what RPMs ill be turning at 70 mph with 37s and 4.30s. That's all lol!!!!!!!

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not sure but i think a shop that does this will have all the info you need. now dont quote me on that but thats my guess.
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