300rpm?
Thread Starter
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Senior User
Joined: Nov 2003
Posts: 283
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From: Wynne, Arkansas
300rpm?
I probably screwed the math up, but I was trying to figure out what my 4.2L (auto) 3.55 F150 would turn if it had a 4.10 rear axle.
Right now I get 1850RPM at 65MPH.
My math tells me I'd get 2150RPM at 65MPH with the 4.10.
Questions:
Right now I get 1850RPM at 65MPH.
My math tells me I'd get 2150RPM at 65MPH with the 4.10.
Questions:
- Is my math right? If not, how do I calculate RPM/ratio differences?
- Does 300RPM make that much of a difference? My 4.2L doesn't even wake up until way past 2150RPM.
- How can I figure what 3rd gear is? When I watch the digital tach it looks like it jumps 800RPM or so if I hit the OD off button.
- Does the transmission still lock out the torque converter in 3rd?
Thread Starter
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Senior User
Joined: Nov 2003
Posts: 283
Likes: 0
From: Wynne, Arkansas
Bump?
I'm especially curious about the torque converter lockout in third gear. I sure wish I could find the "specs" to the transmission. Shift points, lockouts, ratios and stuff like that.
I'm especially curious about the torque converter lockout in third gear. I sure wish I could find the "specs" to the transmission. Shift points, lockouts, ratios and stuff like that.
Postmaster
Joined: Aug 2001
Posts: 4,532
Likes: 5
From: Trussville, Alabama
I get 287 rpm difference. Pretty close to the 300 rpm you came up with.
I think 300 rpm might be noticeable, but not extremely significant when driving down the freeway. Likely more noticeable when starting off / pulling a load.
I do believe the transmission will lock / unlock the torque converter in 3rd gear.
I think I have all the info you wanted. I just have to see if I can find it ????
Thanks and sorry for the delay. Life has been a wee bit hectic lately.
I think 300 rpm might be noticeable, but not extremely significant when driving down the freeway. Likely more noticeable when starting off / pulling a load.
I do believe the transmission will lock / unlock the torque converter in 3rd gear.
I think I have all the info you wanted. I just have to see if I can find it ????
Thanks and sorry for the delay. Life has been a wee bit hectic lately.
Thread Starter
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Senior User
Joined: Nov 2003
Posts: 283
Likes: 0
From: Wynne, Arkansas
I'm used to car, motorcycle and even R/C car/truck magazines publishing torque/horsepower dyno charts. It sure would be interesting to see the charts for the various Ford truck engines. Just giving peak values is meaningless, IMO.
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