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98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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Old 02-10-2009, 11:57 PM   #1 (permalink)
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NV5600 to G-56 conversion?

Is there such a thing? Will the G-56 bold right up in my 01? Its supposed to be a much stronger transmission right?
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Old 02-11-2009, 12:01 AM   #2 (permalink)
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Good question, I know the latest G56 have better final drive ratio than the first models.
Come on guys spill the info!
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Old 02-11-2009, 12:04 AM   #3 (permalink)
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duability wise I would stay with the NV5600 they have a cast steel casing where as the the g56 has an aluminum one. but it should bolt right up if you do swap it might have to change the crossmember but not 100% sure on that one.
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Old 02-11-2009, 12:21 AM   #4 (permalink)
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theres a guy on here that did one. He says he had to move a few mounts, lengthen, shorten driveshafts, n push the under belly up a bit
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Old 02-11-2009, 12:22 AM   #5 (permalink)
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Tranny?
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Old 02-11-2009, 08:34 PM   #6 (permalink)
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Done . History !
The way to go if you have a NV or a GTRAG
Bolts right up
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Old 02-11-2009, 08:47 PM   #7 (permalink)
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if you get a g56 get the g56r outta the newer trucks. they turn about 300 rpm less goin down the highway at 70
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Old 02-11-2009, 11:53 PM   #8 (permalink)
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thanks for the replies. Finding mixed opinions about the strength of the two. Some say its stronger, some say its not. SO im getting hesitant about going to through the work and putting out the extra money if its gonna blow like the 5600 would. my local tranny shop wont touch either of them(there no help). You guys have been grrrreat.
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Old 02-12-2009, 02:33 AM   #9 (permalink)
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All I know is I have hauled some real HVY stuff, No problem.
If there is a known problem some one let me know as I need to keep track too
thanks !!
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Old 02-12-2009, 02:49 AM   #10 (permalink)
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I would like to know why the 3rd gear synchro goes so quick in the NV5600. I think it could be an awesome transmission if someone made a kit that would correct inherent design problems with it.
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Old 02-12-2009, 03:06 AM   #11 (permalink)
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I would like to hear more. Is the newer G56 is the revise down to the left?
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Old 02-12-2009, 03:34 AM   #12 (permalink)
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Quote:
Originally Posted by Explosives87 View Post
I would like to hear more. Is the newer G56 is the revise down to the left?
Yes, the REVERSE (lol) is down to the left.

As for those with questions about the G56, the only problem I have heard is that the input shaft bearing seat is machined into the aluminum housing and then the bearing is pressed in.

This is a poor design and leads to the bearing seat going out of round (oblong) when using your truck as a career tow rig.

Peter at South Bend Clutch has told me he has seen G56's have this happen at 80K miles, and was suprised mine was still ok at 180K when I had my SBC 3250 DD put in.

I haul RV trailers and have 230K on mine.

I guess I have just been lucky so far, but the time is coming.

It is getting harder and harder to shift each day, and sometimes when taking off while towing one of the heavier trailers, it feels like something is out of round or wobbling.

It gets worse the heavier I tow, but the heaviest I have towed to date is a 15,000# portable restroom trailer.

So please watch out, it may be better than an NV5600, but it is VERY far from bullet proof.

**edit** If my tranny goes south, I will seriously consider the Eaton Fuller swap mentioned in this thread
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Last edited by PhatB; 02-12-2009 at 03:44 AM.
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