33's versus 35's

[John B+9]

Except that you can't have the 7MT with squatch and 35's....

Thanks HeritageRider. I know better than that

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[HeritageRider]

Since when? Sasquatch comes with 35's, always, and can be put on any Bronco regardless of transmission. Only thing you can't get is 7MT with the 2.7L V6.

Where have you been? There was a 45 page thread about it!

No Sasquatch with manual

 

[BuckeyeinNV]

Since when? Sasquatch comes with 35's, always, and can be put on any Bronco regardless of transmission. Only thing you can't get is 7MT with the 2.7L V6.

You cannot get Squatch with manual.

 

[TommyTwoTone]

You cannot get Squatch with manual.

Where have you been? There was a 45 page thread about it!

No Sasquatch with manual

My apologies for the misinformation. I stand corrected.

 

[AH64DB2]

What about putting 33” on the Outer Banks?

 

[rjkmoto]

Are you doing 7MT or 10AT?

With 7MT you get the crawl ratio of the Badlands and the lockers, etc.

For the 10AT, Ford seems to be carefully adjusting the gearing to tire size to optimize fuel efficiency (so you’d have a 4.7 when a 4.46 would be the right choice)

The Badlands comes stock with 4.7:1 AND 33” tires.

Ford seems to think it’ll run fine.

JK

 

[Treeza61]

Badlands non-Sas is 4.27 gearing iirc, running 33s on those would be fine.

Sas base(or any trim) is 4.70 with the 35s.

Speaking with linearity they skip the 4.46 gearing that’s available to go up two notches to 4.70. That’s not only overcoming the added diameter and weight, that’s adding some performance to the whole package.

Moving up tire sizes will decrease the RPM the engine turns for any given speed.(and visa versa)

Moving to Steeper gears will Increase the RPM the engine runs at any given speed (and Visa Versa)

So going to the steepest gear set, and then Decreasing tire sizes means your effectively increasing your gearing. I don’t have a calculator handy but your effective gear ratio is close to 4.9X at that point.

Gearing has a sweet spot where not enough means bad fuel economy, and too much also means bad fuel economy.

Nice explanation!

 

[BroncoKong Jr.]

The Badlands comes stock with 4.7:1 AND 33” tires.

Ford seems to think it’ll run fine.

JK

Only with the manual. With automatic it's 4.46:1. Sasquatch gets you 4.70:1.

 

[rjkmoto]

Only with the manual. With automatic it's 4.46:1. Sasquatch gets you 4.70:1.

The original question was about tire size and gears. Even with the MT Ford thinks a smaller engine and higher gears will spin the 33s just fine. ?‍ The 2.7 in auto with 4.7:1 should be fine. The Bronco isn’t a Prius and never will be ...

JK

 

[BroncoKong Jr.]

The original question was about tire size and gears. Even with the MT Ford thinks a smaller engine and higher gears will spin the 33s just fine. ?‍ The 2.7 in auto with 4.7:1 should be fine. The Bronco isn’t a Prius and never will be ...

JK

I think you misread my reply. The 2.7 with an auto doesn't have 4.7:1, it has 4.46:1.

 

[rjkmoto]

I think you misread my reply. The 2.7 with an auto doesn't have 4.7:1, it has 4.46:1.

The Sasquatch package (which requires AT) has 4.7:1.

Theoriginal question was putting 33s on a Sasquatch spec Badlands m/Bronco after delivery. I was pointing out that the the Badlands comes stock with 4.7:1 AND 33” tires. The engine transmission wasn’t really relevant. But yes the Badlands comes with the 4.7 with the MT (AND the smaller 2.3l 4cyl) and the Sasquatch package then requires an AT and rolls with 4.7.

The point was Ford themselves are shipping a truck with 4.7:1 gears AND 33” tires which goes directly to the original question.

?

JK

 

[John B+9]

For any interested I updated the 2.3L gear ratio / speed calculator spreadsheet to reflect no Sasquatch with 7MT (thanks HeritageRider), and add a second tab for 2.3L with 10-speed auto.

I'm impressed with the work Ford engineers did with gear sets and tires. Optimized to keep the engine working in 3,000-5,500 RPM torque band in off-road conditions, as well as providing 70 MPH highway cruise at around 2,100 RPM. The exception are Big Bend and Outer Banks with standard 3.73:1 rear end and 32", which at 70 MPH lope along at 1,800 RPM. Optimized for street, but still a fairly decent 53.8:1 crawl ratio if you opt for the 4x4 auto on-demand xfer case.

 

[BroncoKong Jr.]

The Sasquatch (which requires AT) has 4.7:1.

JK

Yes, which is why I said:

Sasquatch gets you 4.70:1.

 

[John B+9]

What about putting 33” on the Outer Banks?

Hi AH64DB2 (you badass Apache guy - Hooah), if you plan to mount 33" on the Outer Banks you'd probably do best to go up to the optional 4.27:1 rear axle ratio instead of standard 3:73:1 to offset the engine RPM drop with the larger tires. You want torque curve to be in the right place during low-speed ops. ps. thanks for your service. ??

 

[AH64DB2]

Hi AH64DB2 (you badass Apache guy - Hooah), ??

I used to be cool... now not so much. Thanks for the advice.

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