auxiliary transmissions
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New User
Joined: Aug 2007
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auxiliary transmissions
Hi guys
Has anyone added a auxiliary transmission in their trucks, if so what are the pro and cons. Looking into towing RV's from the factory's to the dealers. Has anyone made a decent living doing this?
Thanks
Has anyone added a auxiliary transmission in their trucks, if so what are the pro and cons. Looking into towing RV's from the factory's to the dealers. Has anyone made a decent living doing this?
Thanks
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
Pros... additional forward gear, gear splitting making it to where you have ratios in between the regular gears
Cons... cost, look for a new unit to run around $3000, and it depends what unit you get as to what all mods you have to make.
Cons... cost, look for a new unit to run around $3000, and it depends what unit you get as to what all mods you have to make.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
That was me talking about it and I came to the conclusion that there is nothing out on the market that I really want.
What I want is a VERY close ratio aux tranny that will change engine rpm 200 rpm or less and needs to be minimum 2 speed. 3 or 4 would be more preferable, but there is simply nothing on the market for a pickup truck like that.
HUMPH!!!
So when the money is there I'll probably end up getting a US Gear OD unit and bolt it in.
EDIT: Do a search for "Need to talk gear ratios"
What I want is a VERY close ratio aux tranny that will change engine rpm 200 rpm or less and needs to be minimum 2 speed. 3 or 4 would be more preferable, but there is simply nothing on the market for a pickup truck like that.
HUMPH!!!
So when the money is there I'll probably end up getting a US Gear OD unit and bolt it in.
EDIT: Do a search for "Need to talk gear ratios"
Postmaster
Joined: Apr 2004
Posts: 2,654
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From: Bossier City, LA
Dan, doesn't Ford have a rear diff offered from the factory thats a 2 speed? I know a guy I used to work with put a 2 speed rear in a brand new 05 F350 dually, for towing a 23K emissions testing trailer. (thinking its offered in the 450 550 650) So that would be a direct swap for you.
Posting Guru
Joined: Mar 2007
Posts: 2,216
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From: conroe tx
Postmaster
Joined: Apr 2004
Posts: 2,654
Likes: 0
From: Bossier City, LA
I would love one, they don't offer one yet for a 6.0 with the 5r100w yet, or at least its not listed on their site.
By the way, great sig quote.
By the way, great sig quote.
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Posting Guru
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From: conroe tx
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by mrxlh
Dan, doesn't Ford have a rear diff offered from the factory thats a 2 speed? I know a guy I used to work with put a 2 speed rear in a brand new 05 F350 dually, for towing a 23K emissions testing trailer. (thinking its offered in the 450 550 650) So that would be a direct swap for you.
I may very well be mistaken on the single speed only.
Since you've seen it in the flesh, so to speak, I'll check around again.
Postmaster
Joined: Apr 2004
Posts: 2,654
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From: Bossier City, LA
Dan, if I remember correctly with the gear that was in it, he was getting like 13mpg towing and 21 empty. Of course mileage results may vary with driver. 
It wouldn't be a splitter like a Gear Vendors unit, but the stock gear ratios would be fine for straight towing and, straight empty, due to having to stop to shift.
It wouldn't be a splitter like a Gear Vendors unit, but the stock gear ratios would be fine for straight towing and, straight empty, due to having to stop to shift.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by mrxlh
Dan, if I remember correctly with the gear that was in it, he was getting like 13mpg towing and 21 empty. Of course mileage results may vary with driver.
Any leads would be great.
So are those mileage numbers!
