5 speed vs 6 speed - Dodge Cummins Diesel Forum
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post #1 of 20 (permalink) Old 03-25-2011, 08:42 PM Thread Starter
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5 speed vs 6 speed

Im looking into buying a new truck. I wanting a standard tranny and not sure on getting a 5 or 6 speed. I do a lot of hwy driving and was curious on not having the last gear will effect me. Im open to your suggestions.

thanks for you input.

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post #2 of 20 (permalink) Old 03-25-2011, 08:50 PM
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The overdrives are almost the same. Its just the middle gears are closer together on the 6 speed.
To overhaul an nv4500 is reasonably cheap,
Doing an nv5600 right, with good parts is very expensive.

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post #3 of 20 (permalink) Old 03-25-2011, 10:28 PM
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Doing a 4500 well is not exactlly cheap as good parts become harder to get. But not sure would pay a noticable premium for six. And as said the extra gear is stuck low not on top for crusing/pulling... JMHO

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post #4 of 20 (permalink) Old 03-25-2011, 10:32 PM
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one thing to think about...the 5 speeds are all SO pump motors...which are easier to build power on...some 6 speeds are SO's too, though...

personally i would go 5 speed...just be sure it's either an 01 or 02 or already has some kind of 5th gear nut fix

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post #5 of 20 (permalink) Old 03-25-2011, 10:49 PM Thread Starter
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thanks for the input. Whats the 5th gear nut fix? is it an expensive fix if not done already.
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post #6 of 20 (permalink) Old 03-25-2011, 10:51 PM
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it fixes a nut that holds 5th gear on the shaft...the best fix around would be the quad lp shaft

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post #7 of 20 (permalink) Old 03-26-2011, 12:58 AM
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question...
Is this fix only for a 4x4?
Are they the only ones with problems?



which is what 5spd and 6sp? 5600=? 4500=?

i have a 5spd and 4th gear synchro is out and think clutch is getting weak trying to study up and get everything ready for when i drop it.

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post #8 of 20 (permalink) Old 03-26-2011, 02:18 AM
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Quote:
Originally Posted by powerslide View Post
question...
Is this fix only for a 4x4?
Are they the only ones with problems?



which is what 5spd and 6sp? 5600=? 4500=?

i have a 5spd and 4th gear synchro is out and think clutch is getting weak trying to study up and get everything ready for when i drop it.
supposedly, the later 4500's(5 speed, so the 5600 is the 6 speed) don't have the problem...my 02 had 155k on it when i got rid of it and the gear never fell off...but if you got it apart you may as well fix it just for the peace of mind

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post #9 of 20 (permalink) Old 03-26-2011, 10:07 AM
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Quote:
Originally Posted by cmns2500 View Post
supposedly, the later 4500's(5 speed, so the 5600 is the 6 speed) don't have the problem...my 02 had 155k on it when i got rid of it and the gear never fell off...but if you got it apart you may as well fix it just for the peace of mind
yeah i agree thats while i'm compiling info. mine has 190k and no issues with 5th.

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post #10 of 20 (permalink) Old 03-26-2011, 10:52 AM
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my dad has a pb 12v with the nv4500 and his nut backed off and all we did was weld it on there i know i know not the proper fix but its cheap im also kinda new to buying a cummins i know minimul about them what is the gas milage difference from a 5 spd to a 6 spd
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post #11 of 20 (permalink) Old 03-26-2011, 01:41 PM
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When towing the closer gears are nice to have.

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post #12 of 20 (permalink) Old 03-26-2011, 01:51 PM
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Five speed manual (Cummins standard output diesel engine and 8.0L Magnum V10 engine)...

first gear...5.61
second.......3.04
third.......1.67
fourth.......1.00
fifth........0.75
reverse......5.04

Six speed manual (high output Cummins diesel engine)...

first........5.63
second.......3.38
third........2.04
fourth.......1.39
fifth........1.00
sixth........0.73
reverse......5.63


I love the 6-speed for towing, much nicer than the 5 speed. Final OD ratio is to close to make any difference in mileage, it's not as if the 5600 just has another gear tacked on the end.

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Last edited by 90powerram; 03-26-2011 at 01:53 PM.
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