Re-gearing help - Ford Powerstroke Diesel Forum

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post #1 of 23 Old 11-05-2010, 06:52 PM Thread Starter
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Re-gearing help

Not sure if this is the right sub-forum.

My truck is currently running the stock 3.73's (pretty sure) but i want to re-gear before the summer. I want gears that are ideal for 40" tires because that's my ultimate goal with the truck. What would be the optimum ratio?

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2000 F250 XLT SB SC Auto
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post #2 of 23 Old 11-06-2010, 05:43 PM
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here is a good formula (40/31) X 3.73 = 4.81 so a 4.88 or a 4.56 would be your best bet
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post #3 of 23 Old 11-06-2010, 05:59 PM
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post #4 of 23 Old 11-07-2010, 09:07 AM Thread Starter
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So 4.56 or 4.88's? They seem pretty similar in ratio, so should I just go for the 4.88's to be safe?

Is this a DIY job at home or would it be safer to have a professional do it?

Where do i buy new gears at?

2000 F250 XLT SB SC Auto
6" Lift, 37" BFG KM2's, 18" V-Tec Raptors, DIY Intake, Muffler Delete,
Cortex 1950 (), Kenwood Stereo/Amp/Speakers, Extra Cup Holders!! ( )




115,000 miles and rolling strong
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post #5 of 23 Old 11-07-2010, 09:25 AM
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Quote:
Originally Posted by Shooter04 View Post
So 4.56 or 4.88's? They seem pretty similar in ratio, so should I just go for the 4.88's to be safe?

Is this a DIY job at home or would it be safer to have a professional do it?

Where do i buy new gears at?

I would go 4.88's definitely!
If you have never set up gears then you better have a shop do it! To set them up correctly requires some special tools to get the tolerances just right so they will last.

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post #6 of 23 Old 11-07-2010, 09:30 AM
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i would go with 4.56... and def not a DIY thing... let the prof do it.. i can get you the gears and install kits but an install shop is going to charge you at least 250.00 per axle to change the out....
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post #7 of 23 Old 11-07-2010, 09:50 AM
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I had the same question. I have 37's and the stock 3.73's. I used a ratio calculator and found that 4.30's would bring me back to about the same ratio as the 33's with 3.73. Is there a brand you should look for?
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post #8 of 23 Old 11-07-2010, 09:58 AM Thread Starter
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Quote:
Originally Posted by GregsSD View Post
I would go 4.88's definitely!
If you have never set up gears then you better have a shop do it! To set them up correctly requires some special tools to get the tolerances just right so they will last.
Why 4.88's over 4.56's?

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Originally Posted by Raul@Stealth Automotive View Post
i would go with 4.56... and def not a DIY thing... let the prof do it.. i can get you the gears and install kits but an install shop is going to charge you at least 250.00 per axle to change the out....
And why do you say 4.56's over 4.88's?

Yes i may take you up on the ordering from you. I can't seem to find them online. How much do you sell them for? And i have Innovative diesel here in Houston that i already talked to about doing it and they can.

2000 F250 XLT SB SC Auto
6" Lift, 37" BFG KM2's, 18" V-Tec Raptors, DIY Intake, Muffler Delete,
Cortex 1950 (), Kenwood Stereo/Amp/Speakers, Extra Cup Holders!! ( )




115,000 miles and rolling strong
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post #9 of 23 Old 11-07-2010, 10:05 AM
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well i ran 40's on 4.30 and wished they were a tad bit lower... and i have been in trucks with the same size tires and 4.56 and they are just too low... you want something that will still let you be around 2krpm at 70mph.. the 4.56 will be to low for that... if you did those it would be great for stop and go but at highway speeds your going to be at around 2200 at 70mph

-Raul
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post #10 of 23 Old 11-07-2010, 10:07 AM
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i agree. i did the calculations for my 37's and it came out to be 4.45. so should i go with 4.30's or 4.56's

Chris-2002 F250 7.3L CCSB Lariat:Leveled, WARN hubs, guages EGT TRANS and BOOST, 20" Liquid Metal Wheels, 33x12.50x20 Toyo M/T, '10 Tailgate, Bumper, 6000K HID's, Mag Hy-tec Trans and Rear Diff Covers, 4in TB Straight Pipe, AFE Stage 2 Intake, BTS Valve body, Casserly Stage 1's, GT38r, Reg Return, HPX, Comp Valve Springs, DP-Tuner Live tuned By Jody!!!!
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