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Engine/Transmission (1998.5 - 2002) NV5600 = 12 qts full????

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Well, okay, maybe it isn't exactly 12 quarts, perhaps 11? How about 10. 5???

After burning up the rear main output bearing on the 3rd reman put in my truck last year (lllooonnnggg story, another thread, another day) I asked Blumenthal's in OKC where I was picking up the reman why the bearing failed after only 50,000 miles. They showed me the design flaw which prevents fluid from getting to the output bearing and then proceeded to tell me the untested idea they had to help get fluid to that bearing. Well, I couldn't wait for a test of their theory so I asked how many quarts it takes to fill up the case to the bottom of the bearing. After blank looks for a few moments I asked if they had a reman sitting around and they were getting ready to test one on the dyno, SO, they filled it up to the bottom of the bearing and it took 12 qts. The transmission ran on the dyno with no apparent side affects, so they gave me 12 qts of fluid with my transmission and I agreed to be a guinea pig. Put the 12 qts in through the shift tower after transmission install, hooked up to a camper and headed out on the road. From Indiana to Florida to be exact. From flatlander country through the hills of Kentucky and Tennessee where the smell of transmission fluid burning on the exhaust was noted as I went up and down the hills. After a week or so the level of the fluid was such that it did not come out the vent or the rear seal (not sure which) while going up hills and after 85,000 miles is still working properly, shifting is good.

So, we have all heard about overfilling by one quart. How about 12 qts total? When I change the fluid at 100,000 miles I will measure what I took out and put that amount back in.

Gary; wonder what this would do to transmission fluid temps???

Godspeed,
Trent
 
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HMmmmm - as I recall, even with the Fastcooler and filter setup on my 5600, about all I got in was about 6 quarts - and THAT was above the normal full level. :confused:



Dunno that serious overfilling is necessarily bad, other than potential lube foaming out the breather, but you'll sure be putting it to the test! Hope your input and output shaft seals are good... :eek:
 
Several years ago Midwest Transmission in Zumbrota MN. had a customer constantly having trouble with the NV 4500. He was hot shotting heavy, hard, and fast. They put fastcoolers on a new transmission and added 8 quarts and sent him on his way. He reported a 70 degree drop in temp and has had great luck every since.



Fast Coolers

Verlyn Fast
 
I have the NV5600 and I installed fast coolers and almost 9 quarts of Mopar fluid. I filled to the fill plug on the fast cooler--well above the factory fill plug on the transmission itself. Been that way for 18K with no problems and I really think it shifts better and is less noisy with all that fluid. However, it may just be in my mind.



I checked the fluid the other day and it is still full and a golden honey color--just like new.



I spoke with member EB here on TDR. He had an 03 truck with an NV5600 and he always over-filled to the top bolt on the PTO cover with Amsoil and changed at 50K. He put 345,000 miles on his with no problems! Traded for a new 07...



Regards...
 
WELL, based upon the above, I bought 2 more quarts of transmission lube, will install today if I get time - sure want to extend the life and operation of the transmission as much as possible.



Only concern, is effect on the transmission lube filter setup I also have installed - looks to be designed to function at a specific lube level - hope the higher level doesn't compromise that function - or worse, allow crud accumulated on the filter to be flushed back into the transmission itself... :eek::confused:



#ad
 
You Go Gary!!! I know we will have to beg you to get updates!!!



Godspeed,

Trent



ACTUALLY, there's perhaps a good/bad issue with radically overfilling the NV-5600...



On the BAD side, overfilling may cause more drag on the transmission gear train, requiring more HP drag down the road...



On the GOOD side, that same added drag may well assist the notoriously weak syncros in slowing gear train rotation, and reduce gear clash during shifts.



As far as I'm concerned at this early point, the "good" potential outweighs the "bad"... :-laf
 
Gary,

It is POSSIBLE that more drag is created with rad overfilling, however, the fluid is pretty thin compared to gear oil, so not near the drag we might think, especially when the fluid is at operating temp. The drag could possibly help with slowing down the synchro's but whatever extra HP might be required to overcome any possible drag is certainly available and would be negligible. My only hope is it lubes that dang main output bearing which should save way more dollars in repairing/replacing the transmission than it should cost in extra fuel.

Godspeed,

Trent
 
WELL, as it turned out, all I could get into my transmission with the truck sitting level, and filling to the FastCoolers top plug/dipstick. was another quart - makes about 7 1/2 quarts total. That is about 2 inches above the OEM fill plug on the transmission, and still allows normal checking of lube level and general visual quality of lube - what was on the stick when removed to add the additional quart looked as clean as when installed 10K miles or so back.



I can probably get the other quart in if I park the truck on blocks to raise the driver side - and might later, but will drive it a bit this way to see if any detectable difference - the added quart brought the lube level up about 1/2 inch. I'm not particularly interested in disassembling the shifter to add more lube, so whatever I can get into the cooler's plug will have to be it.
 
So those of you with dual fast coolers how many quarts are you adding. I currently have 7 quarts and I am near the top bolt holes on the PTO cover. Actually I have the clear glass fast cooler "window" and I am 1/8 inch from the top of the glass. I would imagine 9 quarts would put the level way above the bolt holes on the top of the PTO cover. I am trying to figure out what level you guys are at. I can not imagine where the level would be at 12 quarts.
 
Well, I have a FastCooler on one side, and an aftermarket lube filter assembly on the other - each seems to hold about the same volume of additional oil - and as I mentioned earlier, 7 1/2 quarts is pretty well at the FastCooler fill/dipstick hole...
 
kscheffler,

12 qts in a 5600 without Fast coolers or filter assembly comes to the bottom of the main output bearing. See where the shaft comes out the back (on 2wd)? Just a bit below the bottom of that shaft.

Godspeed,
Trent
 
I added FastCoolers and 10 quarts of Severe Gear and Lucas and 75w 90 Gear Oil in mine and it has about 25000 trouble free miles on it.



I want to drill out the rear bulkhead when I change the fluid and change out my clutch at the same time. Make just one big job out of it.



I'm gonna top it off at 12 quarts like you guys have done, too.
 
I know this is probably overkill but this is what I found out about over filling the NV 5600 from John Holmes who use to be at Carson Dodge in Carson City & still writes for TDR. It sounds like it depends on the year of the transmission. For whgat it is worth.

Default Over Filling NV 5600

John , they keep saying to overfill the NV 5600 by a couple of quarts & I talked to ED Addeo at Carson Dodge & he said that he hadn't heard of it but to ask you. It seems like with as much turning of shafts & gears that there would be a lot of oil at the 6th gear bearing. What do you say Thanks J Metzger

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2002 Ram, Quad Cab, Sport, 6 Ft Bed, HO Engine, 4x4, NV5600 6 Speed, Charcoal Grey

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Unread 11-17-2010, 09:46 AM

John Holmes John Holmes is offline

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Hi, sorry it took so long, but I've been on the road. Yes, the early transmissions had the fill plug too low in the case. As I recall there was a TSB on those, but later models had the location moved upward. Have them check for TSBs against your VIN at C. Dodge. If you're really concerned, jack up the truck and tilt it upward on the side of the plug and then fill it.

Tell everybody I said Happy Thanksgiving from Texas. John
 
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