4.10 swap
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4.10 swap
I have a 1993 F-150 with a 300, 5 speed manual, 3.05 gears, and my tire size is 235/75/15. I was thinking about swapping my 3.05 ring and pinion for a 4.10. Right now when I'm doing 75 i pull about 2000 rpms. How big of a change will there be?
P.S. I'm not realy woried about the gas milage.
P.S. I'm not realy woried about the gas milage.
Mountain Pass
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From: Killeen Texas
you'll probably be pulling close to 3000 with that arrangement. just remember that the faster you spin the engine the more wear you cause. you may want to consider a less drastic change. what do you need the lower gers for?
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Well my truck already has 180000 miles on it and it is running strong. The way i drive it it will be notime before I'm rebuilding the motor anyway. The reason i want it is for racing.Do you think that 3.83s will be better?
Mountain Pass
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From: Killeen Texas
the 4.11 will give great takeoff but i don't think you'll have much top end.... you'll run out too quick. personally i think something like 3.73 or 3.83 would be better. i'm sure someone else here has had experience with these ratios and can comment more. I have 3.55 with my 5.0 running 255/55/18 and 3.00 with my 6cyl running 31" 10.50. At 75 in overdrive with my AOD tranny and 5.0 i'm turning about 2500 rpm
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From: spring valley ohio
if the truck is being used for racing i would go with 4.10s im going to run 4.56 with 38s and im not to worried bout it.theres a gy on here with 4.56 gears and 35s and her runing 3000 rpm at 65 i think . so realy i offer u nothing i kinda just wanted to type somthing later
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From: Colorado
Originally posted by acerockola77
The big six is a great engine and it's there for the long run, but it's not going anywhere fast.
The big six is a great engine and it's there for the long run, but it's not going anywhere fast.
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From: WA
Originally posted by broncr
I've seen posts of boosted 300's w/ 400HP - maybe more. The six will go as fast as you can afford to. I think I saw an 8.65 quarter mile - that would be fast enough for me...
I've seen posts of boosted 300's w/ 400HP - maybe more. The six will go as fast as you can afford to. I think I saw an 8.65 quarter mile - that would be fast enough for me...
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From: Colorado
Yeah, my mod'd 6 prolly wouldn't turn an 8 in the 1/8 mile. Back to the original post - I noticed today that my 3.50 gears were spinnin' 3000 rpm @ 75 mph, 3300 rpm @ 85 and I don't know what @ 4,000 rpm...
Since gearing is a math thing, going from 3.0 (for example) to 4.0 gears, your rpms (with the same tires) would increase when measured at the same mph (say 75 ). To find out how much, you'd multiply the rpms (2000) by the new gear ratio (in this case 4 ) then divide that number by the old ratio (3 ). So 2000 X 4 = 8000. Divided by three, that's 2666. 3.05's to 4.10's would push that a tad higher, but I don't have a calculator handy, nor the patience to do it by hand. You'd be doin' 'bout 2700 rpm @ 75 with the 4.10's & no other changes ( tire diameter).
I wish I had that 5th speed overdrive - it drops cruise rpm nicely.
Since gearing is a math thing, going from 3.0 (for example) to 4.0 gears, your rpms (with the same tires) would increase when measured at the same mph (say 75 ). To find out how much, you'd multiply the rpms (2000) by the new gear ratio (in this case 4 ) then divide that number by the old ratio (3 ). So 2000 X 4 = 8000. Divided by three, that's 2666. 3.05's to 4.10's would push that a tad higher, but I don't have a calculator handy, nor the patience to do it by hand. You'd be doin' 'bout 2700 rpm @ 75 with the 4.10's & no other changes ( tire diameter).
I wish I had that 5th speed overdrive - it drops cruise rpm nicely.
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