Ratings???
Senior User
Joined: Jun 2000
Posts: 458
Likes: 1
Ratings???
>Actually NoMo, I was answering your ramblings in your first
>post. If you strictly compare ratios for axle, then you do
>not increase your GCWR rating. You increase your vehicle's
>ability to propel the load you are rated at. Nothing more.
Again you're correct( at least as far as the Super Duties are concerned, they all have a 20,000 CGVWR)
BUT, if you compare just the tow ratings, not the GCVWR, the rated TOWING weight will decrease with a lower numerical gearing. I believe the "tow packages" are standard now on Super Duties so the trucks will be identical save for the ratio.
As far as GCVWR, Ford is lagging behind GM by 2000 pounds now.
The bottom line IMHO is that the 4.30's will deliver more torque to the drive wheels which lessens the strain on clutch or convertor or other trans parts thereby adding a little to the towing capacity.
>post. If you strictly compare ratios for axle, then you do
>not increase your GCWR rating. You increase your vehicle's
>ability to propel the load you are rated at. Nothing more.
Again you're correct( at least as far as the Super Duties are concerned, they all have a 20,000 CGVWR)
BUT, if you compare just the tow ratings, not the GCVWR, the rated TOWING weight will decrease with a lower numerical gearing. I believe the "tow packages" are standard now on Super Duties so the trucks will be identical save for the ratio.
As far as GCVWR, Ford is lagging behind GM by 2000 pounds now.
The bottom line IMHO is that the 4.30's will deliver more torque to the drive wheels which lessens the strain on clutch or convertor or other trans parts thereby adding a little to the towing capacity.
Freshman User
Joined: Apr 2002
Posts: 27
Likes: 0
Ratings???
>Again you're correct( at least as far as the Super Duties
>are concerned, they all have a 20,000 CGVWR)
Actually, not quite right:
GCWR of 3.73 4.10/4.30
5.4L 13,500 15,000
6.8L 17,000 20,000
7.3L 20,000 20,000
Maximum trailer weights are determined by engine/gear ratio/body style
considerations. The heavier the truck, the less trailer you can tow.
Not counting the 5.4L (It's no contender!)
It's interesting to note that the V-10 and the PSD are rated equally with the 4.10/4.30 diffs. When you go taller (3.73's), the V-10 loses out. I imagine it is because of the strain on the trans trying to move that heavy a load at the RPM's the V-10 needs to produce max torque.
>
>The bottom line IMHO is that the 4.30's will deliver more
>torque to the drive wheels which lessens the strain on
>clutch or convertor or other trans parts thereby adding a
>little to the towing capacity.
Right on!
Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Ratings???
>Actually NoMo, I was answering your ramblings in your first
>post. If you strictly compare ratios for axle, then you do
>not increase your GCWR rating. You increase your vehicle's
>ability to propel the load you are rated at. Nothing more.
As has been noted, GCWR is dependent upon the axle ratio. I should have been more clear that my first post was referencing vehicles with the same configuration- except gears.
>post. If you strictly compare ratios for axle, then you do
>not increase your GCWR rating. You increase your vehicle's
>ability to propel the load you are rated at. Nothing more.
As has been noted, GCWR is dependent upon the axle ratio. I should have been more clear that my first post was referencing vehicles with the same configuration- except gears.
Senior User
Joined: Jun 2000
Posts: 458
Likes: 1
Ratings???
Green Machine and NoMo,
Great info!!! I mistakingly thought all Super Duties were 20,000 CGVWR across the board. On this site it showed the MAX as being 20K and doesn't break down the ratio/motor combos. The Excursion info also proves the ratio alone affects tow ratings because obviously all else is equal.
I stand by my theory that the higher numerical gearing is easier on drive line components giving it a higher tow rating.
Great info!!! I mistakingly thought all Super Duties were 20,000 CGVWR across the board. On this site it showed the MAX as being 20K and doesn't break down the ratio/motor combos. The Excursion info also proves the ratio alone affects tow ratings because obviously all else is equal.
I stand by my theory that the higher numerical gearing is easier on drive line components giving it a higher tow rating.
Post Fiend
Joined: Nov 2001
Posts: 5,871
Likes: 0
From: Coutts Canada
Ratings???
Something my dad told me was that you can tow really not that much more than your truck weighs so the more it weighs the more it is capable of towing. For example: my dad has a 87 3/4 supercab with lots of extra springs. With nothing in the bed the truck can only really tow around 10,000lbs, with 300 gallons of diseal, 200 gallons of gas, and around 50 gallons of oil in the back the total weight of the truck and trailer is about 18,000lbs(water tank on a trailer and all the chemicals nessecary for spraying) this truck is a 4 speed manual(not sure though) 351w and 4.10 gears.
Thread
Thread Starter
Forum
Replies
Last Post
falconowner89
1973 - 1979 F-100 & Larger F-Series Trucks
7
Aug 5, 2005 10:35 PM
nate5812
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
8
Feb 28, 2005 09:35 AM
