G56 Rough Shifting? - Dodge Cummins Diesel Forum
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post #1 of 17 (permalink) Old 04-01-2019, 11:53 AM Thread Starter
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Question G56 Rough Shifting?

Just bought my first 4th gen (2015 3500) last year and working on getting it up to speed maintenance wise. I've had a bunch of 3rd and 2nd gen dodge diesels before, but the Merc trans is new to me. It seems like it's a lot rougher of a transmission than the old NVs. I'm wondering if this is true across the board or if my truck needs a little transmission work. While it doesn't necessarily grind when putting it in gear, when it's cold it takes some force to get the gear lever into place, almost like the synchros aren't meshing properly. Usually goes away after the truck reaches temp. I'm also having a tough time shifting smoothly with it, like I said I've had a handful of other diesel-manual trucks and some manual cars that I've always figured out the clutch pretty quickly on, but this one is still jumping on me. If I don't let the clutch out just right I get a noticeable jerk. No rattling in the clutch, although the throw-out bearing makes a little clank if I let the petal loose (from the floor to full open when the trans in neutral). Truck had 69k miles when I got it, up to 72k now. Don't know the history of the truck.

Plan on dumping the fluid and putting in 7 qts of syncrhomesh this spring, but anyone else with experience with these trucks report similar issues?


2014 3500 Cummins-G56 CCSB
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post #2 of 17 (permalink) Old 04-01-2019, 02:57 PM
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Sounds normal to me. Mine is the slowest shifting trans I’ve driven.

At 72k it might be time to dump the stock clutch if it makes noise. It should be very quiet.

'16 2500 Laramie | CCLB | Max Steel | G56 | Anarchy EFI live | Valair DD
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post #3 of 17 (permalink) Old 04-02-2019, 10:29 AM Thread Starter
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I kind of had a feel it was just a slug of a trans, thanks for confirming my suspicions. Noise isn't worrying me too much yet, but sounds like it's time to set some money aside for some Vlair parts.

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post #4 of 17 (permalink) Old 04-03-2019, 01:04 PM
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Yeah the valair organic dual disc is really nice. I would recommend it. Unlike south bend, the valair clutch can go on sale during holiday sales. Helps save a couple $.

'16 2500 Laramie | CCLB | Max Steel | G56 | Anarchy EFI live | Valair DD
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post #5 of 17 (permalink) Old 04-03-2019, 01:13 PM
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That doesn’t sound right my g56 shifts fast and smooth it’s a treat to drive. The recommended fluid for these trannys is mobile delvac and it’ll make shifting slow until it’s warmed up. Maybe the PO put that in your truck along with a dual disc? Dual discs are notoriously slow shifters as well.

-1999 2500 white sport QCSB/NV4500/EMS free spins
-1997 2500 12v LWB 5spd, 1998.5 3500 P24V 5spd
-2016 MC Laramie G56 maximum steel, zero chrome
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post #6 of 17 (permalink) Old 04-03-2019, 01:17 PM Thread Starter
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So as a rookie with aftermarket clutches, what's the advantage of the organic clutch kits? With the NV's I always just put OEM clutches in, from the talk about the OEM clutch in the G56's I think I want aftermarket for this truck. I don't quite know if I need a dual disc, the truck is mostly used for payloads and not for towing too much. Heaviest thing I tow is a 25 foot camper on mostly flat, long stretches - although the peace of mind would be nice. Thanks for the tip about the holiday sales, I'll be sure to keep an eye out for deals.

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post #7 of 17 (permalink) Old 04-03-2019, 01:21 PM Thread Starter
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Nuljas - Possible that the previous owner did a clutch, but I haven't had a change to inspect anything under there. I do see evidence of other mods that the PO kept when he traded the truck in (rub marks on the sway bar even though it has factory wheels and tires, wires in the box for a camper shell, etc) but I don't see any evidence of under the hood mods. I thought the recommended fluid for the G56 was Mopar Auto tranny fluid? The aftermarket guys are the ones I heard about the synchromesh from.

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post #8 of 17 (permalink) Old 04-03-2019, 01:34 PM
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Quote:
Originally Posted by Regal_Six View Post
Nuljas - Possible that the previous owner did a clutch, but I haven't had a change to inspect anything under there. I do see evidence of other mods that the PO kept when he traded the truck in (rub marks on the sway bar even though it has factory wheels and tires, wires in the box for a camper shell, etc) but I don't see any evidence of under the hood mods. I thought the recommended fluid for the G56 was Mopar Auto tranny fluid? The aftermarket guys are the ones I heard about the synchromesh from.
Do you really think Mercedes would spec Mopar auto tranny fluid for their manual? Mercedes recommends mobile delvac, Mopar is cheap thatís why they put atf in it. Itís heavier then ATF thatís why it shifts slow till it gets warm.

As far as clutches an organic clutch is for normal street driving/towing with some increased power levels. The advantage of organic is soft engagement unlike ceramic but it wonít hold up to the abuse ceramic will.

-1999 2500 white sport QCSB/NV4500/EMS free spins
-1997 2500 12v LWB 5spd, 1998.5 3500 P24V 5spd
-2016 MC Laramie G56 maximum steel, zero chrome
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post #9 of 17 (permalink) Old 04-03-2019, 01:51 PM Thread Starter
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No clue what Mercedes would do, never had to deal with any of their products before. However if they built the G56 for FCA to use or even just modified an in-house unit to fit the specs that FCA was looking for its completely possible they specced it to run on Mopar oil. But I agree the reason they put ATF in there was because they're cheap bastards. Mine's still rough even after it warms up so I'm leaning towards it's the original clutch and it's on it's way out the door at 72k miles. Is that the SAE 50 Mobil stuff you're using. Looks cheaper than the synchromesh by a noticeable margin.

2014 3500 Cummins-G56 CCSB
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post #10 of 17 (permalink) Old 04-03-2019, 02:12 PM
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This trans is used in medium duty trucks in Europe and was adapted to the ram. What they use to spec doesn’t seem to be available in the US so most use delvac 50. Amsoil MTG and synchromesh are also popular alternatives. It’s been argued a lot if you google it you’ll find lots of conflicting info. Pto coolers that add a quart each aren’t a bad idea if you tow a lot

-1999 2500 white sport QCSB/NV4500/EMS free spins
-1997 2500 12v LWB 5spd, 1998.5 3500 P24V 5spd
-2016 MC Laramie G56 maximum steel, zero chrome
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post #11 of 17 (permalink) Old 04-03-2019, 02:19 PM
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Disclaimer:

At the end of the day ram warranties your transmission so do your research and only run what you feel comfortable running

-1999 2500 white sport QCSB/NV4500/EMS free spins
-1997 2500 12v LWB 5spd, 1998.5 3500 P24V 5spd
-2016 MC Laramie G56 maximum steel, zero chrome
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post #12 of 17 (permalink) Old 04-03-2019, 02:20 PM Thread Starter
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Sounds about right, never know what these corporate rigs try to pull. I work for a large size heavy duty truck manufacturer and the number of ridiculous designs I've had to deal with because of some decision from corporate would surprise you (or maybe not). That's why I asked though, the interwebs is all over the place on synchromesh vs amsoil vs just use the factory ATF. I think I'll try the delvac with an extra quart in through the shift tower and put the money I'd use for PTO coolers towards a new clutch when I find a sale.

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