Quick Gear Question
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Junior User
Joined: Oct 2006
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Quick Gear Question
Hey all,
I have a 3.55 rear with an AOD Transmission and 32 inch tires.
I spin really low rpms on the freeway, like 2,000 at 73 or something like that.
I was wondering how much of a gain I would see by switching over to 4.11 gears? I have put some performance parts on my engine but I can only see a difference in the higher rpms, it still is a dog. Would I really pick up some speed with the 4.11's?
Also, I do almost all in-town driving, 4.11's would help my gas mileage, right?
Is it worth it to try and find one of these axles?
Thank you!
I have a 3.55 rear with an AOD Transmission and 32 inch tires.
I spin really low rpms on the freeway, like 2,000 at 73 or something like that.
I was wondering how much of a gain I would see by switching over to 4.11 gears? I have put some performance parts on my engine but I can only see a difference in the higher rpms, it still is a dog. Would I really pick up some speed with the 4.11's?
Also, I do almost all in-town driving, 4.11's would help my gas mileage, right?
Is it worth it to try and find one of these axles?
Thank you!
Senior User
Joined: Aug 2007
Posts: 156
Likes: 1
From: Greensburg,PA
I would say that you would notice the difference in acceleration and in town it would probably help you get into OD quicker but on the highway it will not help your gas mileage. Of course I don't think it will hurt it that much either. Check out the tire size/gear ratio/rpm table to see what you would be turning at speed. I think there is a good one at Novak conversion website or check in the offroad forum. They have several listed there.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
your od gear is actually higher then mine with the e4od. i have 35's, 4.88's and in OD going 65mph my rpms are 2200 which for a 5.8 is at the bottem end of the power range so for you 4.10s would probably be just right.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
It would help to know what engine size you have. 
If you do a lot of in-town driving, leaving the AOD in Drive instead of O.D. will help.
Can't say much until I know what engine.
4.9L you are just about right with the RPMs
5.0L you need a lot of help, and definately a better gear ratio wouldn't hurt.
etc...
If you do a lot of in-town driving, leaving the AOD in Drive instead of O.D. will help.
Can't say much until I know what engine.
4.9L you are just about right with the RPMs
5.0L you need a lot of help, and definately a better gear ratio wouldn't hurt.
etc...
Thread Starter
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Junior User
Joined: Oct 2006
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sorry! it's a 5.0
and at 65 i'm well under 2k rpms, i like to try and drive around 70-75 so the engine is closer to the powerband...doesn't slip out of OD as easily.
but like i said, most of my driving averages under 30 mph.
and at 65 i'm well under 2k rpms, i like to try and drive around 70-75 so the engine is closer to the powerband...doesn't slip out of OD as easily.
but like i said, most of my driving averages under 30 mph.
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Postmaster
Joined: Feb 2008
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Obviously a 4.10 is going to get you moving quicker so acceleration is going to improve also.
Especially in a 3 ton truck.
Especially in a 3 ton truck.
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