Rear axle ratios and impact on towing
Suppose you have a choice between two axle ratios, say they are a 3.09 and a 3.45. And let's say the vehicle has an 8 speed transmission, so there's plenty of gear flexibility. Ok, so there's roughl...
Forum Discussion
OP because a diesel's peak torque is at a much lower rpm in my situation a 3.73 is very good but the same truck with a gas engine needs a 4.10 because of the higher rpms.
"9200lb with the 3.73, yet ~11200 with 4.10s" Other than making it a little easier to get going I would like the engineers that come up with these differences to explain it. My personal opinion is because of people that put it in D and never touch the gear shift again except to back up. Mine is a stock 02 PSD (275 hp) with 3.73 axles and I often gross over 26K in OD on flat ground. In rolling hills if I keep it above 65 I can stay in OD. On longer hills I down shift early and keep the RPMs up. I have a programmer for it but have never needed the extra HP. Even though my son has the new Ford with 400 hp/800 torque I doubt I'll pull with it as it would probably cost me a lot of money.
"9200lb with the 3.73, yet ~11200 with 4.10s" Other than making it a little easier to get going I would like the engineers that come up with these differences to explain it. My personal opinion is because of people that put it in D and never touch the gear shift again except to back up. Mine is a stock 02 PSD (275 hp) with 3.73 axles and I often gross over 26K in OD on flat ground. In rolling hills if I keep it above 65 I can stay in OD. On longer hills I down shift early and keep the RPMs up. I have a programmer for it but have never needed the extra HP. Even though my son has the new Ford with 400 hp/800 torque I doubt I'll pull with it as it would probably cost me a lot of money.
