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I was reading my owners manual the other day, and i noticed that in the towing capacity section, it listed three availible transmissions: the 727, the getrag, and a heavy duty 4speed auto. Has anyone ever heard of this?

also, the manual lists the availible gear ratios, and there is no 3.07 listed.

Any ideas?
 

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Depending on the literature, they never offered the 3.07's with a manual. And there are only a few known 3.07/ manual trucks around.

'91 was the year they went from the 3-speed to the 4-speed. The literature you have was probably made in '91, when both kinds of trucks were on the lot at the same time.
 

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We have two '91's with 4 speeds that came that way from the factory...
 

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Yes. If it's a 4-speed it's a 91.5, which means it's intercooled, has 7mm injector bores, has a more advanced computer, has a later style KSB and has a 21 cm turbo housing.

If it's a 3-speed than it's a 91.0, which means it's non-intercooled, has 9mm injector bores, has a less advanced computer, has an earlier style KSB and has a 18.5 cm turbo housing.
 

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they never offered the 3.07's with a manual
I have a 93 dealer build book. It shows you could get 3:07's in a manul 3/4 CTD. It was not a option for a dually.

The build code was DMM for the getrag/3:07 combo.
 

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whats a ksb?

is the 91.5 7mm bores better or worse?

also my 91.5 has a 4speed auto
 

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The A727 3 speed was available with 4.56, 4.10, 3.73, 3.55, and 3.08. The 518/618 was available with 4.56, 4.10, 3.90, and 3.54. The Getrag 5 speed manual was available with 4.10, 3.55, 3.21, and 3.08 according to my information.
 

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I have a 93 dealer build book. It shows you could get 3:07's in a manul 3/4 CTD. It was not a option for a dually.

The build code was DMM for the getrag/3:07 combo.
That's why I said "depending on literature, they never offered 3.07's with a manual"... As evidenced by the manual that was referenced in the original post.

I think you're book is the only evidence that the factory ever officially considered it, and there are about 3 trucks in the country that have manuals and 3.07's from the factory... It's an incredibly rare option, at any rate.
 

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Yea and I got the one dually with an auto that was built with them in 93. :lol3:

CTDFan my 93 book only shows 4:10, 3:54, 3:08 for gear ratios it doesn't matter on the trans selection.
 

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The A727 3 speed was available with 4.56, 4.10, 3.73, 3.55, and 3.08. The 518/618 was available with 4.56, 4.10, 3.90, and 3.54. The Getrag 5 speed manual was available with 4.10, 3.55, 3.21, and 3.08 according to my information.
727 with 4.56 gears. I never heard anything but 3.07 with the 727. I would hate to have one of those. It would be like driving around in second gear.
 

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The A727 3 speed was available with 4.56, 4.10, 3.73, 3.55, and 3.08. The 518/618 was available with 4.56, 4.10, 3.90, and 3.54. The Getrag 5 speed manual was available with 4.10, 3.55, 3.21, and 3.08 according to my information.
my 90 owners manual states that the only gear ration available for the 727 was the 3.07 and the getrags were availible with 3.54's and 4.10's thats the way it is and a 727 with 4.56's would max out at about 55 MPH so thats a little much if you stop and think about it...
 

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When I spec'd out a new one in 89 I was told getrag was 3:54 only and auto's were 3:08's. There was also a note in the dealer build book about not adding posi to the rear axle due to problems with clutchs grenading in heavy tow appls.

90 was the year that 4:11's became an option.
 
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