Am I the only one that has changed their 19.5's to 22.5's

[joes2901]

The 500 RPM drop when easing off the throttle in 3rd gear may be the torque converter locking up again.

[WeBRVing]

Originally Posted by LVRVLUVR

makes the speedo 10% slow...which in turn make your 3rd gear 10% over drive

Trans ratios stay the same, they don't change. The only thing that's changed is your final drive ratio, so you have to use a lower trans gear to pull a grade. You're still going the same speed, just in a different gear with lower RPMs....
Same mother, different father.

[LVRVLUVR]

Originally Posted by 530ktm

I can not explain what it is doing but I can go from 3rd at 4300 rpm if I let up on the throttle a bit to a different gear at approx. 3800 rpm and maintain a speed of approx. 55mph and this is definitely not in 5th gear. What ever it is doing, it works good and I like the way it performs on this coach.

here's the spec for ford 158 wb..
they rate the HP at 3900 rpms.... where as before it was 4750
the rear end gear ratio is still the same..
on one of my older coaches when I went to the 22.5s ... I had Baca's differential in vegas change out my gears to 4:88....

the 22.5's that come on ford chassis are taller tire and they get a 5:38 gear
also note that ford says the 16k chassis can tow 7000 lbs

Stripped Chassis 158" DRW

Brakes

Drum - Rear (Yes or )
Rear Brake Rotor Diam x Thickness (in) 15.6
Brake ABS System 4-Wheel
Brake ABS System (Second Line) 4-Wheel
Disc - Front (Yes or ) Yes
Disc - Rear (Yes or ) Yes
Front Brake Rotor Diam x Thickness (in) 15.6
Rear Drum Diam x Width (in)

Electrical

Maximum Alternator Capacity (amps) 175
Cold Cranking Amps @ 0° F (Primary) 750
Cold Cranking Amps @ 0° F (2nd) 750

Engine

Fuel System Sequential MPI
SAE Net Torque @ RPM 457 @ 3250
Engine Oil Cooler Regular
SAE Net Horsepower @ RPM 362 @ 4750
Engine Order Code 99Y
Engine Type Regular Unleaded V-10
Displacement 6.8 L/415

Exterior Dimensions

Wheelbase (in) 158

Fuel Tank

Fuel Tank Capacity, Approx (gal) 80
Aux Fuel Tank Location Midship
Fuel Tank Location Midship

Interior Dimensions

Passenger Capacity 1

Steering

Steering Type Re-Circulating Ball
Turning Diameter - Curb to Curb (ft) 45.4

Summary

Vehicle Name Ford Super Duty F-53 Motorhome
Body Style Chassis

Suspension

Suspension Type - Front Leaf
Suspension Type - Rear Leaf
Spring Capacity - Front (lbs) 7000
Spring Capacity - Rear (lbs) 11000
Axle Type - Front Non-Independent
Axle Ratio (:1) - Rear 4.30
Axle Ratio (:1) - Front 4.30
Axle Capacity - Rear (lbs) 12000
Axle Capacity - Front (lbs) 8000
Axle Type - Rear Rigid Axle

Tires

Spare Tire Size Full-Size
Front Tire Capacity (lbs) 7780
Rear Tire Capacity (lbs) 14620
Revolutions/Mile @ 45 mph - Front 633
Revolutions/Mile @ 45 mph - Rear 633
Spare Tire Order Code 512
Spare Tire Order Code
Front Tire Size LT245/70SR19.5
Rear Tire Size LT245/70SR19.5
Spare Tire Size
Front Tire Order Code T96
Rear Tire Order Code T96

Trailering

Maximum Trailering Capacity (lbs) 7000
Wt Distributing Hitch - Max Tongue Wt. (lbs) 1050
Wt Distributing Hitch - Max Trailer Wt. (lbs) 7000
Dead Weight Hitch - Max Tongue Wt. (lbs) 700
Dead Weight Hitch - Max Trailer Wt. (lbs) 7000

Transmission

Trans Order Code 44T
Fourth Gear Ratio (:1) 1.00
Fifth Gear Ratio (:1) 0.71
Reverse Ratio (:1) 2.88
Trans PTO Access No
Transfer Case Power Take Off No
Second Gear Ratio (:1) 2.20
First Gear Ratio (:1) 3.11
Trans Description Cont. Again
Trans Description Cont. Automatic w/OD
Trans Type 5
Third Gear Ratio (:1) 1.55
Drivetrain Rear Wheel Drive

Weight Information

Gross Axle Wt Rating - Rear (lbs) 11000
Gross Axle Wt Rating - Front (lbs) 6500
Gross Combined Wt Rating (lbs) 23000
Gross Vehicle Weight Rating Cap (lbs) 16000
Curb Weight - Rear (lbs) 3193
Curb Weight - Front (lbs) 3063

Wheels

Front Wheel Size (in) 19.5 X 6.75
Spare Wheel Material
Rear Wheel Material Steel
Spare Wheel Material Steel
Front Wheel Material Steel
Spare Wheel Size (in)
Spare Wheel Size (in) Full-Size
Rear Wheel Size (in) 19.5 X 6.75

[LVRVLUVR]

Originally Posted by joes2901

The 500 RPM drop when easing off the throttle in 3rd gear may be the torque converter locking up again.

your MH is 29' with 2 ac's???

[joes2901]

Yes, I asked Newmar to build my 2901 (29' 11") with 2 A/Cs and the front is a 15K BTU heat pump/AC and rear a 13.5K BTU with a 50 Amp. electrical system and 5.5 KW Onan. Since, we live in "Hell Hot" SW USA I wanted a system that could cool the RV in 15 to 20 minutes when it was 105+ outside and I was returning to the RV in the PM. The great thing about having Newmar build your RV is they will make changes that you ask for while it is being built like a 10 CuFt refig w/ice maker instead of 8 CuFt standard, I had them run 1" conduits for wiring needed to add a 2.8 KW Magnum inverter/charger and solar panels, and a 20.5 K chassis instead of the std 18K chassis. I had to wait 4 months for it to be built but I got what I wanted. They also gave me a buffet with cabinets for a computer work center and stand alone table instead of the dinnete, and I had them make changes to the upholstery and wall paper colors and add extra windows.

[LVRVLUVR]

Originally Posted by joes2901

Yes, I asked Newmar to build my 2901 (29' 11") with 2 A/Cs and the front is a 15K BTU heat pump/AC and rear a 13.5K BTU with a 50 Amp. electrical system and 5.5 KW Onan. Since, we live in "Hell Hot" SW USA I wanted a system that could cool the RV in 15 to 20 minutes when it was 105+ outside and I was returning to the RV in the PM. The great thing about having Newmar build your RV is they will make changes that you ask for while it is being built like a 10 CuFt refig w/ice maker instead of 8 CuFt standard, I had them run 1" conduits for wiring needed to add a 2.8 KW Magnum inverter/charger and solar panels, and a 20.5 K chassis instead of the std 18K chassis. I had to wait 4 months for it to be built but I got what I wanted. They also gave me a buffet with cabinets for a computer work center and stand alone table instead of the dinnete, and I had them make changes to the upholstery and wall paper colors and add extra windows.

WOW.... that's the way to do for sure