gearing (what are u running) - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 18 (permalink) Old 05-25-2010, 09:42 PM Thread Starter
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gearing (what are u running)

OK here's my question what gearing are u running in your truck what tire size and what kind of rpms are u spoolin at 60 MPH?
I'm running 6.5 deaver with 35's running 2k with 4.88's
I'm just trying to get a feel for what gearing to go with. Thinking of 4.10 and 37's only pull Max 12k. Lbs mayby 3 times a year the rest is a daily driver thanks for the info

02 F350 SUPERDUTY CC LB
4" turbo back straight piped
K&N (soon to be 6637)
Glowshift gauges
( pyro, boost, fuel pressure, trans temp)
6.5" deaver lift on 35's
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post #2 of 18 (permalink) Old 05-25-2010, 09:51 PM
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Re: gearing (what are u running)

my truck with 3.73s and 33-35s would run 2,000 rpm at what the speedo read to be 70..I cant remember off the top of my head what my boost number where....4.88s and 35s is way overkill..i think your on the right track with 4.10s and 37s

Josh Mink
CAMB MOTORSPORTS
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post #3 of 18 (permalink) Old 05-25-2010, 11:54 PM
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Re: gearing (what are u running)

4.30's, with 40's

For 60 MPH
2200 (NO OD)
1540 (IN OD)
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post #4 of 18 (permalink) Old 05-26-2010, 12:55 AM
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Re: gearing (what are u running)

4.10 with 37 is fine. You can use the calculator to figure you exact rpm out with your tranny and rear end gear ratio and tire diameter.
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post #5 of 18 (permalink) Old 05-26-2010, 12:59 AM
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Re: gearing (what are u running)

I would not go bigger then 4.10's for anything under 37's, and no bigger then 4.30's for anything under 44's...


IMHO...

70 and 2100 with 37's and 4.30's



80 and 2400 with 37's and 4.30's


[CENTER]01 F-250 SC PSD,430k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100, Studs, 910 springs, Forged rods, Hydra chip, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #6 of 18 (permalink) Old 05-26-2010, 01:07 AM
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Re: gearing (what are u running)

Really, way is that?

Do you think the stock setup with 3.73 is over geared?

With 38's it would take 4.56 to take it back to stock and that's not accounting for the weight dif. 40s would take even more.

What do you find to be the negatives?

Is it so it gives the these turbos more time to run up thru each gear?

I hear conflicting advise on this by seeming equally experienced persons. I am sure some say it becasue they do not want to lay down the $$ for 2 axles gear changes but that is only some.


I was honestly thinking 4.56 would be correct for the 40's SS-M16 I am planning but had considered 4.30s as I can find either at salvage yard for our axles fairly easily.
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post #7 of 18 (permalink) Old 05-26-2010, 01:14 AM
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Re: gearing (what are u running)

Quote:
Originally Posted by TARM View Post
Really, way is that?

Do you think the stock setup with 3.73 is over geared?

With 38's it would take 4.56 to take it back to stock and that's not accounting for the weight dif. 40s would take even more.

What do you find to be the negatives?

Is it so it gives the these turbos more time to run up thru each gear?

I hear conflicting advise on this by seeming equally experienced persons. I am sure some say it becasue they do not want to lay down the $$ for 2 axles gear changes but that is only some.


I was honestly thinking 4.56 would be correct for the 40's SS-M16 I am planning but had considered 4.30s as I can find either at salvage yard for our axles fairly easily.
Having ran and towed for years with 37's and 3.73's, in every combo you can think of... I miss them.

Yes, it was a bit laggy above 4k, but I never had any EGT issues, no towing issues, better fuel economy, quieter cab and just less wear and tear...

I went with 4.30's because I thought it would make this tire burning differance... nope... Got a smoking deal on them used...now I get worse milage, loud as hell at any speed above 65 and its just more wear and tear...

Again, this is just my opinion after about 950k running these trucks with stock, modded, and otherwise turbos, injectors, tire sizes...

[CENTER]01 F-250 SC PSD,430k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100, Studs, 910 springs, Forged rods, Hydra chip, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
Joe
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post #8 of 18 (permalink) Old 05-26-2010, 02:00 AM
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Re: gearing (what are u running)

So running 37's with stock gearing works good eh.
If i have a levling kit and some minor trimming can i fit that size for a bit of offroading i dont want a huge lifted truck. would like a 16x10 with some backspacing work?

Oh. its a 2000 f250 psd.

2000 f250 PSD 6637 filter, 4" magnaflow, firestone bags, Frx, non-epbv pedestal, swamps tunes, stuff from ####raff diesel, bilstein hd shocks, gauges. 265/70/16 general grabber at2.
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post #9 of 18 (permalink) Old 05-26-2010, 02:04 AM
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Re: gearing (what are u running)

37s will take more than minor trimming on a stock truck especially with a 10" wide wheel....id run a 4"lift with a narrow 37 like a 12.50

Josh Mink
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post #10 of 18 (permalink) Old 05-26-2010, 02:08 AM
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Re: gearing (what are u running)

what about with bushwacker cut out flares

2000 f250 PSD 6637 filter, 4" magnaflow, firestone bags, Frx, non-epbv pedestal, swamps tunes, stuff from ####raff diesel, bilstein hd shocks, gauges. 265/70/16 general grabber at2.
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