Perfect balance
Senior User
Joined: Jul 2009
Posts: 213
Likes: 1
From: Slippery Rock, PA
How would a truck with a 351 Cleveland and 3:55 gears do with 33 inch tires for on road only use? Also it has a C6 and the motor is far from stock. Right now with the 30-31 tires it seems to get up and go pretty good, WOT first to second turns the tires over on dry pavement but is spins around 2500-2600rpm at 65mph.
Senior User
Joined: Jul 2009
Posts: 136
Likes: 0
From: menomonee falls wisconsin
lets go back to my first post where i said a truck with 3.70ish gears an 33 INCH TIRES would have decent highway manners
thats right close to your chart and thats before you posted
and im sorry 75f350 but -works for me, in my case, means works for me
i have 7.20.1 gears in my pull truck and i love em
but i wouldnt have it any other way for my beat around rig with 40s and 3.50s
thats right close to your chart and thats before you posted
and im sorry 75f350 but -works for me, in my case, means works for me
i have 7.20.1 gears in my pull truck and i love em
but i wouldnt have it any other way for my beat around rig with 40s and 3.50s
Elder User
Joined: Oct 2005
Posts: 595
Likes: 0
From: Chico, CA
How would a truck with a 351 Cleveland and 3:55 gears do with 33 inch tires for on road only use? Also it has a C6 and the motor is far from stock. Right now with the 30-31 tires it seems to get up and go pretty good, WOT first to second turns the tires over on dry pavement but is spins around 2500-2600rpm at 65mph.
Gears should always be the same ratio front and rear so that you don't have one end trying to go a different speed than the other. However, sometimes the number won't be exactly the same, but instead will be awful close. For example, mine are 4:11 and 4:10. You don't want to be running a 4:10 and a 3:89 together though (or any other combination like this).
Elder User
Joined: Oct 2005
Posts: 595
Likes: 0
From: Chico, CA
I can't tell you exactly if that's a good combo. You'll have to make that decision yourself. I can provide you with another chart that is a bit different than the last and seems to be a bit more optimistic about using higher gears (numerically lower) with larger tires. It does look like 3:73's with 33's are out on the furthest edge with this one. That's where my combo is right now. While it works, like I said earlier, I wish I had lower gears than I do.
Yellow - Highway Driving, Good Fuel Economy
Green - Daily Driver, Best Overall Performance
Blue - Most Power and Towing, Reduced Fuel Economy
This is at 65 mph with a manual. Automatics will have slightly higher RPM's.
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Yellow - Highway Driving, Good Fuel Economy
Green - Daily Driver, Best Overall Performance
Blue - Most Power and Towing, Reduced Fuel Economy
This is at 65 mph with a manual. Automatics will have slightly higher RPM's.
Senior User
Joined: Jul 2009
Posts: 136
Likes: 0
From: menomonee falls wisconsin
in fact thats how my winter truck is set up
but what do i know i didnt look at the chart
Senior User
Joined: Jul 2009
Posts: 213
Likes: 1
From: Slippery Rock, PA
I didn't either 
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Senior User
Joined: Aug 2008
Posts: 291
Likes: 0
From: Fayetteville Arkansas
Thanks for all the info, hearing you guys gripe back and forth was kinda entertaining and listening to both sides of opinons i am still stuck in the middle between the 3.90 and 4.10, i would probaly enjoy 4.10s more but i also dont want a truck that tops out at 60mph, im just gonna have to man up and pick one and live with it. And to the gentleman who posted
Np435
1st-4:78:1
2nd-2:39:1
3rd- 1:37:1
4th- 1:1
its really
NP435
1st-6.69
2nd-3.34
3rd-1.79
4th-1.00
Thanks again for the help fellers
Np435
1st-4:78:1
2nd-2:39:1
3rd- 1:37:1
4th- 1:1
its really
NP435
1st-6.69
2nd-3.34
3rd-1.79
4th-1.00
Thanks again for the help fellers
Elder User
Joined: Oct 2005
Posts: 595
Likes: 0
From: Chico, CA
Thanks for all the info, hearing you guys gripe back and forth was kinda entertaining and listening to both sides of opinons i am still stuck in the middle between the 3.90 and 4.10, i would probaly enjoy 4.10s more but i also dont want a truck that tops out at 60mph, im just gonna have to man up and pick one and live with it. And to the gentleman who posted
Np435
1st-4:78:1
2nd-2:39:1
3rd- 1:37:1
4th- 1:1
its really
NP435
1st-6.69
2nd-3.34
3rd-1.79
4th-1.00
Thanks again for the help fellers
Np435
1st-4:78:1
2nd-2:39:1
3rd- 1:37:1
4th- 1:1
its really
NP435
1st-6.69
2nd-3.34
3rd-1.79
4th-1.00
Thanks again for the help fellers
Anyway, at least you got some info from this thread...
Elder User
Joined: Oct 2005
Posts: 595
Likes: 0
From: Chico, CA
Ok, I did some digging, and I'm still not 100% sure on this, but I'd say that most Fords had the wide ratio (w/ 6.69:1 1st). However, I've found multiple references to there also being a close ratio gearbox used by Ford. I know for a fact that both Dodge and Chevy used both close & wide ratio NP435's, but I can't find a solid source to verify or deny that Ford did also.