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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 98.5-02 24V Forums > 98.5-02 Powertrain
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 02-25-2006, 07:55 AM   #1 (permalink)
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Thumbs up NV5600 & Synchros

I took my truck into the dealer last week, because I was having a hard time down shifting 5-4-3 gears & in general it just sucked. I was grinding the downshifts 60% of the time. I am tired of changing the trans oil every 5,000 miles lately.

The tech tried telling me it was fine, the type of transmission made it shift that way. When I told him the trans didn't shift like this for the first 50,000 miles. He took his boss for a ride & they tried to tell me nothing was wrong. I then told them the mechanic that changed my front gears out a month ago, had also said the sychros were going out. The tech said next step would be to pull it apart to take a look.

The next day, I get a call from the service manager saying my truck was ready. The service manager asked me "when you change the trans oil, do you put the additive in the oil". When I asked what additive?, he told me there was an additive specifically for the trans. I asked for the part number. He was going to check into it for me...

I pick up the truck & immediately notice the more I drive it, the more the transmission shifts loosen up, & don't have the bound up feeling it previously had. It became a lot easier to put in gear from an idle, upshifts didn't have that two step click, & I could down shift 5-4-3 without grinding the gears.

I couldn't reach the Service Manager, so I called his parts department & they told there wasn't an additive for the transmission. I told them the above story. Needless to say, the Service Manager finally called back & told me the additive the tech had put in the trans was actually the Mopar Limited Slip Differential gear oil additive.

It has approximately a 1/2 bottle of the additive in the trans right know, I bought some more & I'm gonna add one full bottle.

After 600 miles, the trans has smoothed out quite a bit,almost car like smooth. I'm gonna see if I can improve it some more. I will post again when I see how well a little more additive helps....
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Old 02-25-2006, 09:03 AM   #2 (permalink)
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Interesting fix for the 6 speed problems... I've heard of them being difficult to shift too... But I've never heard of the LS additive being used.

Most people I talk to about this has gone over to a synthetic of some sort or another and most of the time has cured the problem...
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Old 02-25-2006, 09:25 AM   #3 (permalink)
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once it warms up, id like to go to amsoil syncromesh fluid
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Old 02-26-2006, 02:49 AM   #4 (permalink)
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I've tried stock fluid, pennzoil synchromesh, royal purple synchromesh & currently running Amsoil Synchromesh. After about 2,500 miles the trans starts the grinding shifts & I don't feel like being very slow & methodical to shift the trans.. I also got tired of changing oil every 5,000 miles.

I added a full bottle of the additive today & the shifts are smooth almost car like. I just hope the additive is compatabile with the trans internals.

The trans doesn't have the binding feel to it anymore...
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Old 02-26-2006, 06:56 AM   #5 (permalink)
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Are you using the clutch to shift??? If not, you should. Not using the clutch is very hard on the synchros in the NV5600. It's a large heavy tranny with large gears. It's not designed for speed shifting.:fist:
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Old 02-26-2006, 08:16 AM   #6 (permalink)
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your running amsoil synthetic, with the mopar petroleum additive???
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Old 02-26-2006, 11:35 AM   #7 (permalink)
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Quote:
Originally Posted by Jakey's'01H.O.
your running amsoil synthetic, with the mopar petroleum additive???
Are you SURE the additive is petroleum based? The differential lube Ford uses in the SAME New Venture NV-80's we have in OUR trucks is clearly marked as being synthetic as I recall - guess I'll have to go look at one of the bottles again...
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Old 02-26-2006, 03:30 PM   #8 (permalink)
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Quote:
Originally Posted by DORKWEED
Are you using the clutch to shift??? If not, you should. Not using the clutch is very hard on the synchros in the NV5600. It's a large heavy tranny with large gears. It's not designed for speed shifting.:fist:
Yup speed shifting is very bad - if you want to race a "built" auto is THE choice.....another thing thats hard on the syncros is letting your hand rest on the shifter when you arent shifting. Believe it or not, this can do damage.
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Old 02-26-2006, 06:58 PM   #9 (permalink)
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I have always used the clutch to shift, up & down, I was never got the clutchless shift down. I don't race the truck, the shifting of the transmission has changed over time, more so when I have my 5th wheel in tow.

I haven't changed the way I shift the truck since I bought it, I know it is a truck transmission, not a car transmission. I have only owned 1 car with an automatic & 3 cars, 2 jeeps & 1 truck with a manual transmission, so shifting isn't new to me.

I e-mailed Amsoil on the compatibility of the Limited Slip additive with their Synchromesh fluid. I will also find out if they think their Slip Lock additive would be okay (it should be synthetic)

I also e-mailed Dodge with the following, we'll see if I get a response:

I had my truck into West Valley Dodge for hard shifting transmission problems. The technician initially said it shifted fine. I told them I was having downshifting problems & that changing the gear oil only helps for a short time. The transmission oil was not low & the technician said I don't have a clutch problem.

I know the NV5600 6 speed transmission has a specific oil, (not gear oil) for reasons set in place by New Venture Gear.

My question is: Are the actions of the technician adding the Mopar Limited Slip Axle Lubricant Additive a proper repair? If so, has a TSB for hard shifting been issued?, or will Dodge look into this as a viable repair? I have spoken with 2 other dealers & they haven't heard of adding the Mopar limited Slip Axle Lubricant Additive to the transmission.

I can attest that it worked, but I don't know if the Mopar Limited Slip Axle Lubricant Additive is compatible with the NV5600 internal parts. If the transmission oil was normal gear oil, I would not have any questions. I don't want to find out that the Mopar Limited Slip Axle Lubricant Additive is going to ruin the internal transmission parts.

I tried to contact New Venture Gear, but they were sold to Magna International out of Canada. I couldn't find a New Venture Gear contact on The Magna International website.

Your help in this matter will be greatly appreciated,

Michael Fenn

Last edited by Silver_Ram; 02-26-2006 at 08:18 PM.
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Old 03-04-2006, 08:59 PM   #10 (permalink)
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Very interesting. Limited slip additive? The only reason I can think of is that maybe the stock oil is working so good the syncros cant do their job correctly? Maybe? I have the NV4500 and I know that NV has a specific oil for that tranny because of the fiber syncros but I dont think the NV5600 has the same type of syncros. If in fact the tech or service manager told you thats what they did I would demand they put it in writing for your records so you can have evidence of what they did. That way if later down the road you have tranny problems possibly due to their error then at least you have proof.
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Old 03-10-2006, 06:18 AM   #11 (permalink)
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Dodge's response was the usual we're stupid B.S.

I talked with a couple of different trans rebuilders with no Dodge affiliation & they said wouldn't worry about it. Both have rebuilt several of the NV5600's. They told the NV5600 doesn't use brass synchros, its more like small clutch packs & that's why the limited slip additive turned things around for me.

Amsoil says there is nothing wrong mixing the Mopar additive (petroleum base)with their Synchromesh, but said they would have to do some testing to see if their limited slip additive (synthetic-petroleum blend) was compatible with their synchromesh.

My truck still shifts great & I am just gonna see what happens..
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Old 03-10-2006, 05:41 PM   #12 (permalink)
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Bluementhals in Oklahoma is one of the biggest NV authorized rebuilders out there. Might be worth a call.

My new (4K) 4500 is still shifting stiff. Called up Robby at Bluementhals and he told me the brass synchros they are using take a little break in. I described how I shifted.....a little pressure on the gear till it falls in. He said no go. He said I was babying it too much and to force the gears, up and down, but not to the point of grinding them. He said in two weeks if things haven't improved, that he'd take the appropriate actions to make it right. He said that trans should be butter smooth, and anything other indicates an assembly problem. Of course barring any clutch/pilot issues....which BTW I straightened out this past weekend. I pulled the trans to upgrade the pilot to the roller, thinking this was causing the hard shifting. I called up Peter a SBC and let him know I was finally machining the wheel for the bearing he sent (at no charge btw). He asked how the clutch looked (13" ConFE) I described the linings were a little loose on the disk in their rivets, and some scoring was evident. He said that will not do, and sent me a new pressure plate and disk. I had it in less than 24 hours all the way from Indiana. Pretty good PR in my book....another Kudo to Peter and his crew. Anyway, off topic, the point is that I knew the clutch and bearing are okay. Blumenthals also has excellent PR, as they are ready to ship a replacement should the shifting not clear up.

Food for thought in your choice of vendors.....and trans break in I guess!

Chris
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