3.08 rear end
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New User
Joined: Aug 2002
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From: Greenville
3.08 rear end
I confess I am an amature, but maybe some of you experts out there can help me. I have a 2001 F150 standard cab, reg. box, 4.6 V8 w/3.08 rear end. I love the truck but the transmission is constantly shifting up to go up any small hill (and I mean small!) I am assuming this is because of the 3.08 rear end. I am wanting to put in a 3.55. Gas mileage is around 18+ (not to 19) so I do not think that would be a factor. Would this be a good idea? Would a 3.73 be better? Will there be any changes required to the transmission? How will I go about changing the ratio for the speedometer?
Help Please
Byrdman:
Help Please
Byrdman:
Post Fiend
Joined: Feb 2000
Posts: 11,496
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From: Kansas
3.08 rear end
The 3.55 will help but not eliminate the constant shifting. O/D is a very tall gear and almost any sizable hill will cause it to downshift. Even with the 5.4, you can get a lot of downshifting. And I have a chip (which helps but doesn't eliminate it).
I don't think there is that much difference between the 3.55 and the 3.73. You may not be able to tell much of difference between the two.
Correcting the speedo should not be a problem. I haven't done it but someone here should be able to tell you the proper method.
3.31 gears
I don't think there is that much difference between the 3.55 and the 3.73. You may not be able to tell much of difference between the two.
Correcting the speedo should not be a problem. I haven't done it but someone here should be able to tell you the proper method.
3.31 gears
New User
Joined: May 2002
Posts: 21
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From: Virginia Beach USA
3.08 rear end
As far as I know, you don't need any tranny changes. I have a 2002 f-150 with 4.6, auto and had a 3.08. I didn't like the 3.08. I had a dealer replace the gear with a 3.55 limited slip. I like it alot better. They had to adjust the speedo. Good Luck!
Junior User
Joined: Apr 2002
Posts: 65
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From: TX
3.08 rear end
What is the breakpoint where a new carrier is required? As an example, on a jeep (I've got a little knowledge as a former jeeper) when you go from 3.08 to 3.55 or 3.73 or 4.10 a new carrier is required, the reason being the change in ring and pinion relative diameter. Is it safe to assume that the same is true for the Ford 8.8?
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New User
Joined: Aug 2002
Posts: 7
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From: Greenville
3.08 rear end
At this point I have just about decided to find a rear end from a wrecked vehicle and install the entire axle. That seems to be the easiest solution. I don't even know what a "carrier" is, but from your description I have a good idea.
Thanks!
Thanks!
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Senior User
Joined: Feb 2001
Posts: 223
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From: Long Island
3.08 rear end
byrdman,
My '98 E-150 4.6lw 3.55 rear had Big problems on big hills/mountains and smaller problems on small hills. I live on Long Island NY...only small hills. I had trouble while climbing these small hills (probably the biggest under 70 feet) especially with the A/C on the engine would "lug" and with cars right in front of me I couldn't really give it the gas to force down to 3rd gear. This always seemed to happen on "in town" main roads at like 35 to 45 mph.
What I tried, and it worked, was to set the truck to overdrive "OFF" when I drove around town. When I realized this worked alot better I disconnected the battery so the electronic tranny could "re-learn " my driving habits. I now feel the van responds MUCH better on The Interstate and Parkways too!
Hey, give it a try if you don't find a good enough improvment you can always regear the rear.
Good Luck,
Mc
My '98 E-150 4.6lw 3.55 rear had Big problems on big hills/mountains and smaller problems on small hills. I live on Long Island NY...only small hills. I had trouble while climbing these small hills (probably the biggest under 70 feet) especially with the A/C on the engine would "lug" and with cars right in front of me I couldn't really give it the gas to force down to 3rd gear. This always seemed to happen on "in town" main roads at like 35 to 45 mph.
What I tried, and it worked, was to set the truck to overdrive "OFF" when I drove around town. When I realized this worked alot better I disconnected the battery so the electronic tranny could "re-learn " my driving habits. I now feel the van responds MUCH better on The Interstate and Parkways too!
Hey, give it a try if you don't find a good enough improvment you can always regear the rear.
Good Luck,
Mc
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