rear axle ratios.
Thread Starter
|
Elder User
Joined: May 2007
Posts: 548
Likes: 0
From: Sparks, NV
rear axle ratios.
which ratio will let me get off the line the quickest? i hear racers saying the 4.11 ratios and such since it gets into the powerband sooner, im looking for an upgrade fro the 3.27 ratio 9" i got now that i found that gear vendors unit, i know if you go too low of a ratio, you have a really soft start like a u-haul truck i drove a month ago (topped out at 65 in O.D.) ive been looking at the final ratio list on the GV site, and it seems to me i will get the same final rpm as 3.27 with the 4.11 ratio, good choice or something higher like a 3.90 (basing it off the website for final ratios)
Thread Starter
|
Elder User
Joined: May 2007
Posts: 548
Likes: 0
From: Sparks, NV
you bet it is, followed with some random hauling of a car, load of gravel and stuff like that, i figured the 4.11 would give me the same fuel economy for a final drive ratio w/ the o.d. on
Posting Guru
Joined: Sep 2006
Posts: 1,781
Likes: 1
If your looking for fuel economy you will want to stay away from a 4.10 rear end. Your gonna be peggin the rpms pretty high around like 65mph. Your gonna have to pick if you want a fuel economy truck that is good for haulin or a truck that is quick off the line. Cant have both very well.
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
4.88's, 5.13s....some of the hardcore guys that turn 8K or so and use 2 speeds gear for it.
But if yo uare gonna drive this on the road, 4.10 is the highest you can go and get a speedo gear
But if yo uare gonna drive this on the road, 4.10 is the highest you can go and get a speedo gear
Temporarily Deactivated
Joined: Apr 2008
Posts: 410
Likes: 0
everyone seemed to miss the part that you had od. so yes 4:10's are fine with an od to cruise around a bit and drive to the track.
Trending Topics
Postmaster
Joined: May 2008
Posts: 2,703
Likes: 3
From: La Vergne, TN
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Logistics Pro
Joined: Jun 2008
Posts: 4,990
Likes: 6
From: Florida
Ok so since this topic is about gears,I might as well ask my question for my truck.I'm going from 2.75 to 3.73.I'm going to need to swap speedo gears right?
Post Fiend
Joined: Jan 2006
Posts: 14,941
Likes: 4
From: North of Normal
Yeah you will.
Laughing Gas
Joined: Apr 2003
Posts: 837
Likes: 2
From: Minnesota
3.73's ... especially with the GV OD. I seriously looked at spending the 3 grand to make it happen but Clyde isn't a cruiser and averages only about 3,000 miles a year.
With 3.73 rears and a C6 (we haven't mentioned the tranny yet) you have an effective ratio of a little over 3.00 in direct/od, 3.73 in direct/direct and for heavy or mountain pulling second/OD will end up somewhere around 4.30.
I managed a fleet for a seed company and ran everything from 30,000 gross combined to "errand" trucks. If I only could have had one ratio across the whole fleet it would have been the 3.73.
You are correct about being 'too tall' with some ratios in OD. Ford made a big mistake putting 2.97's or such with OD 300-6's. They were lugging most of the time ... and the 300 was a low rpm torque engine. With the 3.73's I had trucks that would outpull 351's/3.55 and still run low-mid 20's for mileage.
With 3.73 rears and a C6 (we haven't mentioned the tranny yet) you have an effective ratio of a little over 3.00 in direct/od, 3.73 in direct/direct and for heavy or mountain pulling second/OD will end up somewhere around 4.30.
I managed a fleet for a seed company and ran everything from 30,000 gross combined to "errand" trucks. If I only could have had one ratio across the whole fleet it would have been the 3.73.
You are correct about being 'too tall' with some ratios in OD. Ford made a big mistake putting 2.97's or such with OD 300-6's. They were lugging most of the time ... and the 300 was a low rpm torque engine. With the 3.73's I had trucks that would outpull 351's/3.55 and still run low-mid 20's for mileage.
Temporarily Deactivated
Joined: Apr 2008
Posts: 410
Likes: 0
ok next question what is your rear tire size?
i have 4.10's with an e4od and 235/85 r16 i run in the 2200 rpm range at 75.
granted you wont have a lockup convertor and it depends on the gear vendors od ratio.
i have 4.10's with an e4od and 235/85 r16 i run in the 2200 rpm range at 75.
granted you wont have a lockup convertor and it depends on the gear vendors od ratio.
Thread Starter
|
Elder User
Joined: May 2007
Posts: 548
Likes: 0
From: Sparks, NV
im planning on getting 35 inch tires, but my truck looks pretty good for 32's and a 2wd stock lift. i'm wondering if i slide a 4.10 ratio 9" 3rd member in, or get like a sterling 10.25" maybe a dana 60. if its too much work,
Thread
Thread Starter
Forum
Replies
Last Post
Kuskoal
Clutch, Transmission, Differential, Axle & Transfer Case
3
Jun 5, 2008 11:41 PM
davidsca
Offroad & 4x4
7
Oct 2, 2006 12:14 AM