Numbers Don't Lie 3.73 vs. 4.30 Explained
#31
06-22-2021, 06:32 PM
#32
06-23-2021, 07:19 AM
You do realized that extra 4,000 lbs is only in play when taking off. A gear 2 sizes lower does not increase towing capacity 4,000lbs going cruising down interstate at 65mph, LOL. I have said all along that when taking off the 4.30 will pull and take off easier. I can ease into the gas and get the load moving and will not have any problems with a 3.73 gear since I'm only pulling 22,000 total weight. Once up to speed I'll be in one gear lower in the transmission and have a lower final drive ratio, which is putting more torque to the rear wheels and the engine will always be making more HP and TQ since I will be running about 100-285 more RPM's. More torque applied to the rear wheel, and the engine putting out more HP and TQ will flat out pull a combination of lesser value. That is a simple fact!!! Maybe there is a reason the Ford engineers designed the 10 speed transmission with the gear ratio's they did. It is very smart what they did with each gear from 3rd-8th gear (gears used in pulling on the highway) all having a lower final drive ratio then with a 4.30. Interesting how almost 80% of the truck get a 3.73 gear. Let's look at the post with all the RPM and Speed and in every gear there is a performance/pulling advantage with the 3.73 gear being in 1 gear lower in the transmission.
Please just read and carefully look at these number.
Look especially at this 7th 4.30 x 1.010 = 4.34 -- 2965rpm @ 65.02mph 6th 3.73 x 1.277 = 4.76 -- 3250rpm @ 64.98mph -- if I hit a hill here I want the extra 285 RPM's, gives me more HP and TQ for pulling up hills then the 4.30 gear. This would probably be the first time you hit a pretty good hill and drop down a gear. The 3.73 will flat *** out pull the hell out of the 4.30 gear!! Why? Much lower final gear drive ratio 4.34 vs 4.76 is a big difference AND the engine will be making much more HP and TQ! Those numbers don't LIE!!! 3.73 gear is definitely better!
Say we are in some small rolling hills which gear will pull better: 8th 4.30 x 0.851 = 3.66 -- 2700rpm @ 70.27mph 7th 3.73 x 1.010 = 3.77 -- 2780rpm @ 70.28mph -- this is almost the same as the 4.30 turning only 80 RPM's more. This is once again a lower final drive ratio and will produce a touch more HP and TQ. Let face it this is the gear were a lot of the pulling will be when towing 19,000 - 22,000 lbs, unless in the mountains. The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
Now let's cruise down a flat interstate at 70mph: 9th 4.30 x 0.687 = 2.95 -- 2175rpm @ 70.12mph 8th 3.73 x 0.851 = 3.17 -- 2335rpm @ 70.06mph --- this is turning 160 RPMs more than the 4.30 gear. Once again the 3.73 gear will easily out pull the 4.30 gear. There is not as much HP and TQ at 2175 RPM! At least at 2335 RPM I do have more HP and TQ but I also have a much lower final drive ratio 2.95 vs 3.17 which will put more TQ to the rear wheels. Once again the lower final gear drive ratio and the engine making more HP and TQ the 3.73 will out pull the 4.30 gear!!! PERIOD!
It does this in every pulling gear (3rd-8th) towing down interstate. And when I'm not pulling my trailer (90%) of the time I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!
Have a great day!!
Please just read and carefully look at these number.
Look especially at this 7th 4.30 x 1.010 = 4.34 -- 2965rpm @ 65.02mph 6th 3.73 x 1.277 = 4.76 -- 3250rpm @ 64.98mph -- if I hit a hill here I want the extra 285 RPM's, gives me more HP and TQ for pulling up hills then the 4.30 gear. This would probably be the first time you hit a pretty good hill and drop down a gear. The 3.73 will flat *** out pull the hell out of the 4.30 gear!! Why? Much lower final gear drive ratio 4.34 vs 4.76 is a big difference AND the engine will be making much more HP and TQ! Those numbers don't LIE!!! 3.73 gear is definitely better!
Say we are in some small rolling hills which gear will pull better: 8th 4.30 x 0.851 = 3.66 -- 2700rpm @ 70.27mph 7th 3.73 x 1.010 = 3.77 -- 2780rpm @ 70.28mph -- this is almost the same as the 4.30 turning only 80 RPM's more. This is once again a lower final drive ratio and will produce a touch more HP and TQ. Let face it this is the gear were a lot of the pulling will be when towing 19,000 - 22,000 lbs, unless in the mountains. The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
Now let's cruise down a flat interstate at 70mph: 9th 4.30 x 0.687 = 2.95 -- 2175rpm @ 70.12mph 8th 3.73 x 0.851 = 3.17 -- 2335rpm @ 70.06mph --- this is turning 160 RPMs more than the 4.30 gear. Once again the 3.73 gear will easily out pull the 4.30 gear. There is not as much HP and TQ at 2175 RPM! At least at 2335 RPM I do have more HP and TQ but I also have a much lower final drive ratio 2.95 vs 3.17 which will put more TQ to the rear wheels. Once again the lower final gear drive ratio and the engine making more HP and TQ the 3.73 will out pull the 4.30 gear!!! PERIOD!
It does this in every pulling gear (3rd-8th) towing down interstate. And when I'm not pulling my trailer (90%) of the time I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!
Have a great day!!
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#33
06-23-2021, 07:49 AM
#34
06-23-2021, 09:49 AM
You do realized that extra 4,000 lbs is only in play when taking off. A gear 2 sizes lower does not increase towing capacity 4,000lbs going cruising down interstate at 65mph, LOL. I have said all along that when taking off the 4.30 will pull and take off easier. I can ease into the gas and get the load moving and will not have any problems with a 3.73 gear since I'm only pulling 22,000 total weight. Once up to speed I'll be in one gear lower in the transmission and have a lower final drive ratio, which is putting more torque to the rear wheels and the engine will always be making more HP and TQ since I will be running about 100-285 more RPM's. More torque applied to the rear wheel, and the engine putting out more HP and TQ will flat out pull a combination of lesser value. That is a simple fact!!! Maybe there is a reason the Ford engineers designed the 10 speed transmission with the gear ratio's they did. It is very smart what they did with each gear from 3rd-8th gear (gears used in pulling on the highway) all having a lower final drive ratio then with a 4.30. Interesting how almost 80% of the truck get a 3.73 gear. Let's look at the post with all the RPM and Speed and in every gear there is a performance/pulling advantage with the 3.73 gear being in 1 gear lower in the transmission.
Please just read and carefully look at these number.
Look especially at this 7th 4.30 x 1.010 = 4.34 -- 2965rpm @ 65.02mph 6th 3.73 x 1.277 = 4.76 -- 3250rpm @ 64.98mph -- if I hit a hill here I want the extra 285 RPM's, gives me more HP and TQ for pulling up hills then the 4.30 gear. This would probably be the first time you hit a pretty good hill and drop down a gear. The 3.73 will flat *** out pull the hell out of the 4.30 gear!! Why? Much lower final gear drive ratio 4.34 vs 4.76 is a big difference AND the engine will be making much more HP and TQ! Those numbers don't LIE!!! 3.73 gear is definitely better!
Say we are in some small rolling hills which gear will pull better: 8th 4.30 x 0.851 = 3.66 -- 2700rpm @ 70.27mph 7th 3.73 x 1.010 = 3.77 -- 2780rpm @ 70.28mph -- this is almost the same as the 4.30 turning only 80 RPM's more. This is once again a lower final drive ratio and will produce a touch more HP and TQ. Let face it this is the gear were a lot of the pulling will be when towing 19,000 - 22,000 lbs, unless in the mountains. The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
Now let's cruise down a flat interstate at 70mph: 9th 4.30 x 0.687 = 2.95 -- 2175rpm @ 70.12mph 8th 3.73 x 0.851 = 3.17 -- 2335rpm @ 70.06mph --- this is turning 160 RPMs more than the 4.30 gear. Once again the 3.73 gear will easily out pull the 4.30 gear. There is not as much HP and TQ at 2175 RPM! At least at 2335 RPM I do have more HP and TQ but I also have a much lower final drive ratio 2.95 vs 3.17 which will put more TQ to the rear wheels. Once again the lower final gear drive ratio and the engine making more HP and TQ the 3.73 will out pull the 4.30 gear!!! PERIOD!
It does this in every pulling gear (3rd-8th) towing down interstate. And when I'm not pulling my trailer (90%) of the time I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!
Have a great day!!
Please just read and carefully look at these number.
Look especially at this 7th 4.30 x 1.010 = 4.34 -- 2965rpm @ 65.02mph 6th 3.73 x 1.277 = 4.76 -- 3250rpm @ 64.98mph -- if I hit a hill here I want the extra 285 RPM's, gives me more HP and TQ for pulling up hills then the 4.30 gear. This would probably be the first time you hit a pretty good hill and drop down a gear. The 3.73 will flat *** out pull the hell out of the 4.30 gear!! Why? Much lower final gear drive ratio 4.34 vs 4.76 is a big difference AND the engine will be making much more HP and TQ! Those numbers don't LIE!!! 3.73 gear is definitely better!
Say we are in some small rolling hills which gear will pull better: 8th 4.30 x 0.851 = 3.66 -- 2700rpm @ 70.27mph 7th 3.73 x 1.010 = 3.77 -- 2780rpm @ 70.28mph -- this is almost the same as the 4.30 turning only 80 RPM's more. This is once again a lower final drive ratio and will produce a touch more HP and TQ. Let face it this is the gear were a lot of the pulling will be when towing 19,000 - 22,000 lbs, unless in the mountains. The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
Now let's cruise down a flat interstate at 70mph: 9th 4.30 x 0.687 = 2.95 -- 2175rpm @ 70.12mph 8th 3.73 x 0.851 = 3.17 -- 2335rpm @ 70.06mph --- this is turning 160 RPMs more than the 4.30 gear. Once again the 3.73 gear will easily out pull the 4.30 gear. There is not as much HP and TQ at 2175 RPM! At least at 2335 RPM I do have more HP and TQ but I also have a much lower final drive ratio 2.95 vs 3.17 which will put more TQ to the rear wheels. Once again the lower final gear drive ratio and the engine making more HP and TQ the 3.73 will out pull the 4.30 gear!!! PERIOD!
It does this in every pulling gear (3rd-8th) towing down interstate. And when I'm not pulling my trailer (90%) of the time I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!
Have a great day!!
I cannot even fathom how you've gotten to these conclusions.
So again, what happens if I also downshift my 4.30 equipped truck 1 gear to match your 3.73 equipped truck? Now I have a larger torque advantage than you, while letting the engine work less to reach and maintain speed.
#35
06-23-2021, 10:02 AM
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#36
06-23-2021, 11:24 AM
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#37
06-23-2021, 12:02 PM
#38
06-23-2021, 01:57 PM
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#39
06-23-2021, 04:48 PM
No but I set 2 World Records drag racing with our 1996 Pro Street Red Firebird. I developed a nitrous oxide nozzle got a patent on it and did a licensed agreement with Edelbrock Inc in Torrence, CA. for them to sell it when they contacted my and wanted to know if I wanted to sell it to them back in 2001. All the nitrous nozzle they sell to this day are under my patent design which atomizes the fuel better than any nitrous nozzle on the market. Fuel does not atomized well when trickling out of a round hole at 6 psi of fuel pressure and that is what was being manufactured for over 15 years. I saw a design issue with every nozzle made since they all had a round hole for the fuel to flow through. I cut a slit in the passage to allow the fuel to fan out like water flowing out of a car wash wand. I also brought out the first ever nitrous system that worked with 60psi of fuel pressure. Nitrous Nozzles had been around for over 20 years and I designed it to work correctly. I set the World Record at the first race we went to after running the new nitrous nozzle design. I build my own engines, made and designed my own nitrous nozzle system and have a did all the tuning. https://www.ecklerscorvette.com/edel...-455273-1.html
" target="_blank">https://www.youtube.com/watch?v=TO4i0_5bDvE
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#40
06-23-2021, 07:20 PM
Tuned
I have read through this entire thread. All the OP is saying is that if a driver wants the mechanical advantage of 4.30s in a truck that has a 3.73 rear end, the driver only has to drop one gear in a 10 spd tranny. There is no magic to it. The first gear advantage goes to the 4.30s and this is no small win especially stop and go uphill or heavy or both. I don't think the OP is saying the 3.73s are hands down the best but they do offer an very good alternative when coupled with the 10 spd.
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#41
06-23-2021, 07:31 PM
I have read through this entire thread. All the OP is saying is that if a driver wants the mechanical advantage of 4.30s in a truck that has a 3.73 rear end, the driver only has to drop one gear in a 10 spd tranny. There is no magic to it. The first gear advantage goes to the 4.30s and this is no small win especially stop and go uphill or heavy or both. I don't think the OP is saying the 3.73s are hands down the best but they do offer an very good alternative when coupled with the 10 spd.
#42
06-23-2021, 07:37 PM
No but I set 2 World Records drag racing with our 1996 Pro Street Red Firebird. I developed a nitrous oxide nozzle got a patent on it and did a licensed agreement with Edelbrock Inc in Torrence, CA. for them to sell it when they contacted my and wanted to know if I wanted to sell it to them back in 2001. All the nitrous nozzle they sell to this day are under my patent design which atomizes the fuel better than any nitrous nozzle on the market. Fuel does not atomized well when trickling out of a round hole at 6 psi of fuel pressure and that is what was being manufactured for over 15 years. I saw a design issue with every nozzle made since they all had a round hole for the fuel to flow through. I cut a slit in the passage to allow the fuel to fan out like water flowing out of a car wash wand. I also brought out the first ever nitrous system that worked with 60psi of fuel pressure. Nitrous Nozzles had been around for over 20 years and I designed it to work correctly. I set the World Record at the first race we went to after running the new nitrous nozzle design. I build my own engines, made and designed my own nitrous nozzle system and have a did all the tuning. 6.68 seconds at 211mph in the 1/4 mile
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#43
06-23-2021, 07:44 PM
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#44
06-23-2021, 07:48 PM
I didn't say it did. But it give me years of data off a computer that was on the car that really helped me to understand how to get the transmission gear ratio's and rear end ratio to work across the engines HP and TQ curve. That is why I like the 3.73 pulling anywhere from 3rd to 8th gear.
I
I
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#45
06-23-2021, 07:53 PM
...Once up to speed I'll be in one gear lower in the transmission and have a lower final drive ratio, which is putting more torque to the rear wheels and the engine will always be making more HP and TQ since I will be running about 100-285 more RPM's. More torque applied to the rear wheel, and the engine putting out more HP and TQ will flat out pull a combination of lesser value....
...The 3.73 will flat *** out pull the hell out of the 4.30 gear!!...3.73 gear is definitely better!...
...This is once again a lower final drive ratio and will produce a touch more HP and TQ....The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
...Once again the 3.73 gear will easily out pull the 4.30 gear....I do have more HP and TQ but I also have a much lower final drive ratio... 3.73 will out pull the 4.30 gear!!! PERIOD!...
...I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!...
...The 3.73 will flat *** out pull the hell out of the 4.30 gear!!...3.73 gear is definitely better!...
...This is once again a lower final drive ratio and will produce a touch more HP and TQ....The 3.73 gear has a lower final drive ratio and better pulling power. Oh and one other thing! I will be out of overdrive and be on a 1 to 1 gear ration in the transmission which usually means less heat being produced by the transmission and on a much stronger gear!
...Once again the 3.73 gear will easily out pull the 4.30 gear....I do have more HP and TQ but I also have a much lower final drive ratio... 3.73 will out pull the 4.30 gear!!! PERIOD!...
...I will get better gas mileage with the 3.73 gear cruising down interstate at 75MPH!...
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