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Old 11-29-2005, 09:30 AM   #29
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The G56 was the 6 speed for mid 05.I have 05 3500 long box quad cab. I have about 6,000 miles on it.Just got back from a 600 mile trip non towing drove the speed limit 60-70 calculated was 19.1 mpg. Seems to be getting better with use.The overhead mpg guage usually reads high by about 1mpg.
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Old 11-29-2005, 06:15 PM   #30
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Any body know if manual hubs can be added? Doan,t make any sense to put all that extra wear and tear on the front diff just so I dont have to get out and lock the hubs. Does AAM manufacture th GM 14 bolt?
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Old 11-29-2005, 08:00 PM   #31
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Dynatrac makes some... the web page only goes up to 05 but I don't know of any axle changes to the 06... could be worth a call ...
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Old 11-30-2005, 05:59 PM   #32
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RidgeTop:
Any body know if manual hubs can be added? Doan,t make any sense to put all that extra wear and tear on the front diff just so I dont have to get out and lock the hubs. Does AAM manufacture th GM 14 bolt? </div></BLOCKQUOTE>

Cost is about $1800. Too steep for me.
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Old 12-01-2005, 11:47 AM   #33
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Too steep for me.
</div></BLOCKQUOTE>

I think that was the general consensus on the truck forums...

The front end is built to spin all the time without wearing out, fuel savings likely wouldn't be noticeable, and the cost of the conversion is prohibitive.

Plus, then you would have to deal with the drawbacks of manual or auto-locking hubs...
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Old 12-03-2005, 05:32 AM   #34
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RidgeTop:
Dealer told me 1500miles before we should tow. Man thats along way. We went with the 6 Speed which is supposed to be a new Mercedes medium duty truck tranny for 06. I guess medium duty is actually heavy duty for a light duty truck if that makes any sense. I love the truck so far but one thing that suprises me is how low the gearing seems. It has 3.73's and in 6th gear at 65 mph the tach is reading 2000 rpm. Anybody have any advice on driving this rig for best MPG.Drive it like You stold it..LOL JOHN
Phil </div></BLOCKQUOTE>
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Old 12-04-2005, 07:50 PM   #35
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Seems the most practical way to lower the gearing is to increase tire diamiter. Ihave always liked lifted trucks (We still own a 97 F250 with 38" Swamper Radial TSL's) but with the new rig gas milage is becoming a concern. Any advice on lifting and modding an 06 CTD 6 speed would be appreciated. Seems 35" tires would compliment the rig just not sure the the best way to go about it .
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Old 12-04-2005, 07:53 PM   #36
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Sorry bigger tires would raise the gear ratio not lower it
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Old 12-05-2005, 05:17 AM   #37
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Larger diameter tires have the same effect as a higher (lower numerically) gear ratio. In other words, larger tires might make the 70 MPH engine speed of a truck with 3.73s equivalent to, say, a truck with 3.54s.

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Old 12-05-2005, 01:43 PM   #38
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Posted December 03, 2005 09:28 AM
You got the best now put it to the test..LOL John..I know I have had a 1996,1997,2001,2003 all mine and all good no lease for Me.Owner operator..enjoy Your New Ride!!
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Old 12-05-2005, 03:51 PM   #39
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I got my Dodge 3500, HO ENGINE, 410 GEARS,AUTO, SINGLE REAR WHEELS in 2003 . Pulling a 35 ft. CROSSROADS 5er DOUBLE SLIDES. I have 31,000 miles on it mostly all towing. It pulls it like there's nothing back there. The sweet spot on my engine is 2150 and thats about 70 mph. with overdrive ON( THE BEST FUEL MILEAGE ). 10.5 - 11.5. The book says no towing until 500 miles I waited but then gave her **** after that. A trip down to South TEX. " REO GRAND VALLY " I told the wife I was only going to go 62-65 mph, my fuel miliage dropped down to 9- 9.5 and with no mountains, my other trips had some mountain driving I guess there is somethig to this " SWEET SPOT " thing.
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Old 12-07-2005, 05:55 PM   #40
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10 4 Rusty on the gear ratio thing. Seems with th new G56 tranny the sixth gear cruising rpms with 3:73s are like the old six speed with 4:10s. Seems a lift and 35s is the best way to lower my cruising rpms.We only tow about 8500 pounds. Bump on advice on a lift and tires.
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