Towing w/ high gears
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Towing w/ high gears
I have a 1990 F-250HD 4x4 with 351W and 3.55gears 5sp ZF
original EVERYTHING
the performance is not there at all!
and am considering changing the gears,
I have put everything new on this engine and the only thing
left is the EGR valve is registering as bad, check engine light on.
But back to the gears I am going to put in 4.56 gears because in the winter I run 34" tires for the muddy terrain.
But at other times I don't do much highway driving at all
and when I do it is just towing at around 60 mph.
will this gear change make much difference at all and if it will a notciable difference??
thanks,.
any ideas appreciated
original EVERYTHING
the performance is not there at all!
and am considering changing the gears,
I have put everything new on this engine and the only thing
left is the EGR valve is registering as bad, check engine light on.
But back to the gears I am going to put in 4.56 gears because in the winter I run 34" tires for the muddy terrain.
But at other times I don't do much highway driving at all
and when I do it is just towing at around 60 mph.
will this gear change make much difference at all and if it will a notciable difference??
thanks,.
any ideas appreciated
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
Towing w/ high gears
Should make a big difference as far as towing ability and off the line performance.
However, keep in mind that gas mileage will probably go down, a lot. Engine wear may go up due to higher RPM. It may be a bit buzzy on the freeway, ie the engine will turn a noticably higher RPM at speed, which make make some noise and or resonance.
The bigger tires will help offset some of these problems.
Things to consider...
I am not sure if you will require a different reluctor for the ABS system(Not sure if you have ABS since I forgot to check your post). A different reluctor may not be available for that gear.
Your computer may need to be recalibrated as well as the speedo/odo.
Like the other guy said you need two sets of gears.
You will probably wear out tires quicker, better acceleration is evil ;^)
All depends on what you want to do and what you are willing to put up with.
Good Luck.
Jim Henderson
However, keep in mind that gas mileage will probably go down, a lot. Engine wear may go up due to higher RPM. It may be a bit buzzy on the freeway, ie the engine will turn a noticably higher RPM at speed, which make make some noise and or resonance.
The bigger tires will help offset some of these problems.
Things to consider...
I am not sure if you will require a different reluctor for the ABS system(Not sure if you have ABS since I forgot to check your post). A different reluctor may not be available for that gear.
Your computer may need to be recalibrated as well as the speedo/odo.
Like the other guy said you need two sets of gears.
You will probably wear out tires quicker, better acceleration is evil ;^)
All depends on what you want to do and what you are willing to put up with.
Good Luck.
Jim Henderson
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Joined: Apr 2000
Posts: 87
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Towing w/ high gears
I too have a '90 F-250HD 4x, but with a 460FI engine and a E4OD trans. It originally came with 3:55 gears, and with the 30" tall tires, it worked so-so. After I installed a Skyjacker 4" suspension kit, Detroit Locker, 35" BFG's, and a some other mods, the 4:10 gears I installed seem to work just fine. At 65MPH the rpm's are at about 2800... 4:56 gears might have been a better choice for a little more grunt off the line, but I want the engine to last as long as possible and, at 10MPG, I didn't want the mileage to suffer. Good Luck
By the way... What front axle do you have? Mine has the Dana 44HD.
rondog
By the way... What front axle do you have? Mine has the Dana 44HD.
rondog
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Senior User
Joined: Jul 2000
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Towing w/ high gears
I have the Dana50 HD front axle/
also you mean 1800rpm at 65 right??
I have 3.55's and 31's and at 65 I am pulling just 1900rpm
the e40d is an overdrive. i have the 5sp manual ZF HD
I too have a '90 F-250HD 4x, but with a 460FI engine and a E4OD trans. It originally came with 3:55 gears, and with the 30" tall tires, it worked so-so. After I installed a Skyjacker 4" suspension kit, Detroit Locker, 35" BFG's, and a some other mods, the 4:10 gears I installed seem to work just fine. At 65MPH the rpm's are at about 2800... 4:56 gears might have been a better choice for a little more grunt off the line, but I want the engine to last as long as possible and, at 10MPG, I didn't want the mileage to suffer. Good Luck
By the way... What front axle do you have? Mine has the Dana 44HD.
rondog
By the way... What front axle do you have? Mine has the Dana 44HD.
rondog
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