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FE Power Forums => FE Technical Forum => Topic started by: Caydoncym on March 17, 2016, 06:53:53 PM

Title: What gears should I run?
Post by: Caydoncym on March 17, 2016, 06:53:53 PM: Have 2wd drive lwb f100. Has a 4 barrel 390 with a c6 and shift kit. It's not going to be driven on the highway. Just the streets. It has 3.50 gears in it right now.
Title: Re: What gears should I run?
Post by: Drew Pojedinec on March 17, 2016, 07:29:20 PM: http://www.angelfire.com/fl/procrastination/rear.html
Title: Re: What gears should I run?
Post by: Autoholic on March 17, 2016, 10:04:13 PM: My calculator might be more user friendly, and provide you with more information. Only the blocks in green need to be changed by you. Oh and you have to download it. If you have any problems with it, just message me.

https://drive.google.com/open?id=0B3iyR3ENvnVsTTdkQ2ZZenFkTlk
Title: Re: What gears should I run?
Post by: falcongeorge on March 19, 2016, 12:19:49 PM: no highway just surface streets, I would run lots of gear. Depends on the tire size and motor, but 3.89s to 4.56s? I run 4.56s with an od with 28" tires in my daily driver, 90% of my driving is around town here, I havent even used the OD in months, for around town, 40/45 mph light to light, the 4.5's are perfect with a free revving sb, FE I would go 3.89s with a 26" tire, 4.11s or 4.30s with a 28 depending on cam/intake.
Title: Re: What gears should I run?
Post by: ScotiaFE on March 20, 2016, 10:09:47 AM: Depends on how much converter you are going to use.
If you have a stock converter then the 3.50 gear will work good.
Title: Re: What gears should I run?
Post by: plovett on March 20, 2016, 11:46:35 AM: Stock 4bbl 390? What size tires on the back?

paulie
Title: Re: What gears should I run?
Post by: Caydoncym on March 21, 2016, 01:44:44 PM: I have a stock converter with 29 inch tires in the back. They're some used Hoosier drag slicks.
Title: Re: What gears should I run?
Post by: plovett on March 21, 2016, 01:57:45 PM: Given that it's not going to be driven on the highway, it has relatively tall rear tires, and it's a fairly heavy pickup, I'd say use some lower gears.

4.11's or even 4.30's would really give it some zing compared to the 3.50's.

JMO,

paulie
Title: Re: What gears should I run?
Post by: turbohunter on March 21, 2016, 02:05:32 PM: Usually a 360 in trucks.
You sure it's a 390?
Title: Re: What gears should I run?
Post by: falcongeorge on March 21, 2016, 02:21:43 PM: Quote from: plovett on March 21, 2016, 01:57:45 PM
Given that it's not going to be driven on the highway, it has relatively tall rear tires, and it's a fairly heavy pickup, I'd say use some lower gears.

4.11's or even 4.30's would really give it some zing compared to the 3.50's.

JMO,

paulie
Ditto, sticky 29's, 4.30s, then as you can afford it, cam and a 10" converter. Yippee!!!
Title: Re: What gears should I run?
Post by: Joe-JDC on March 21, 2016, 02:45:27 PM: Drive shaft hoop before you change gears would be a wise investment. Driveshafts and u-joints tend not to like those lwb trucks and sticky tires. Some sort of traction device would also be a help at keeping the tires planted on the street. I have seen those long driveshafts twisted and come out at the absolute worst time. If you have the two-piece drive shaft, I would think about another vehicle for spirited driving on the street. JMO, but bad things happen in trucks with sticky tires and no weight in the bed. Joe-JDC
Title: Re: What gears should I run?
Post by: Falcon67 on March 21, 2016, 03:00:57 PM: 4.11s are usually a good all around pick depending on tire size. Our F350 has 4.10s and I drive it highway regularly. Usually with 7500 lbs following it.
Title: Re: What gears should I run?
Post by: jgkurz on March 21, 2016, 07:31:34 PM: Quote from: Autoholic on March 17, 2016, 10:04:13 PM
My calculator might be more user friendly, and provide you with more information. Only the blocks in green need to be changed by you. Oh and you have to download it. If you have any problems with it, just message me.

https://drive.google.com/open?id=0B3iyR3ENvnVsTTdkQ2ZZenFkTlk

Great calculator. Thanks for sharing!
Title: Re: What gears should I run?
Post by: Autoholic on March 24, 2016, 04:28:38 PM: Thanks, I've used various calculators created by other people and none of them were as user friendly as what I put into mine.