gear recommendations?
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Cargo Master
Joined: Aug 2008
Posts: 2,661
Likes: 23
gear recommendations?
I'm planning to look at some axles this weekend for my truck (I plan on making her a 4x4).
I'm not completely sure what gears to go with. I plan on putting an engine in of the 351 size. Cars I know, but 4x4 is a little different. My brother has 4.10s in his Bronco and that thing hauls, but he also runs a manual transmission, I plan on putting an automatic in, probably like a C6, so I'm not sure how that will effect it. (I ask because on my Mustang a 4.11 with a manual is A LOT more gear than with a C6)
Suggestions?
I'm not completely sure what gears to go with. I plan on putting an engine in of the 351 size. Cars I know, but 4x4 is a little different. My brother has 4.10s in his Bronco and that thing hauls, but he also runs a manual transmission, I plan on putting an automatic in, probably like a C6, so I'm not sure how that will effect it. (I ask because on my Mustang a 4.11 with a manual is A LOT more gear than with a C6)
Suggestions?
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
It depends on two things: What size are your back wheels/tires, and what kind of driving do you want to do.
The manual transmission, your Mustang Transmission and the C6 all have the same upper gear ratio at 1:1 unless one of them has overdrive. With a 351 type engine and a C6 and 15 inch back wheels/tires you will want something around 3.0 to 2.8 to drive 65 on the freeway at 2350 rpm. That's what I have - 2.79 to 1
Here's a link to a post on the subject, and embedded in all of them is an RPM speed gear ratio calculator. This comes up about once a week. So you chould be able to find tons of info.
https://www.ford-trucks.com/forums/7...alculator.html
The manual transmission, your Mustang Transmission and the C6 all have the same upper gear ratio at 1:1 unless one of them has overdrive. With a 351 type engine and a C6 and 15 inch back wheels/tires you will want something around 3.0 to 2.8 to drive 65 on the freeway at 2350 rpm. That's what I have - 2.79 to 1
Here's a link to a post on the subject, and embedded in all of them is an RPM speed gear ratio calculator. This comes up about once a week. So you chould be able to find tons of info.
https://www.ford-trucks.com/forums/7...alculator.html
Thread Starter
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Cargo Master
Joined: Aug 2008
Posts: 2,661
Likes: 23
Probably around 35-38" tires...
by the look of that calculator, with 4.11 Gears I'll be at about 3000rpm at 75mph with 38"
I think if I go too low it will be a pain with the stop and going...
Thanks
by the look of that calculator, with 4.11 Gears I'll be at about 3000rpm at 75mph with 38"
I think if I go too low it will be a pain with the stop and going...
Thanks
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Most typical 4x4's of the '73-79 vintage had 3.50 gears on the half tons, with stock 235's for tires, and C6's for transmissions. Later on in the 80's, 3.08 gears became the norm, with the same everything else. The 3/4 ton's all had a typical 4.11 gear with 3.73 as an option. The 4.11's give a better load carrying gear to get going with. 35-38" tires will need about a 4.11 gear regardless. I ran 36's with a C6 and 3.50 gears, and it wasn't enough gear to get moving, though cruising speed was alright. But I had the torque to make up for it. Regardless, the gears in both front and rear have to match each other with the same size tires.
Post Fiend
Joined: Feb 2001
Posts: 6,328
Likes: 124
From: Iowa
I agree with Havi. 38" tires are big and usually demand about a 4.10 or better. A 351 can make real good torque though. If you choose the right cam you can maybe cheat a little on the gears. 3.90 maybe. Much higher and it will be soft on the bottom end.
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