Royal Purple SynchroMax - two thumbs down...

[steved]

I have been thinking Is there a way to flush the transmission out??

Could you put something in the transmission after you drain it, like Marvel Mystery oil?



My plan is/was to:

1. Put MMO in the transmission after I drain.

2. Put the t-case in neutral.

3. Run through all the gears. (no throttle applied)

4. Drain and refill.



Does this pose any problems????

Either that or auto transmission fluid... for all the longer it would be in there...



steved

 

[steved]

OK, just talked with the RP folks... they want a sample... OK, not a problem.



I took the truck for a short drive around the block as to make sure I wasn't doing the "what was that?" and imagining things... it was slightly better (probably due to having cold oil in it)... but still hard shifting...



I decided to drain a few ounces out of the transmission to have a look see... the fluid is dark and metal flaked... a lot of metal flake. I was going to take a picture of what I have in the jar, but it is dark enough that it probably wouldn't show anything... even the fresh fluid is dark, but it is clear.



Talking with the RP folks, he wants me to drain the dirty oil out and replace it (and get a sample for them too) ASAP... I'm going to use the new RP I got for the tcase for the replacement (a different batch number)... my Redline didn't come in yet...



I'm frustrated... looks like I have major problems... he told me that just because the PZ came out clear doesn't mean that this junk hasn't been in the transmission for sometime and the RP just cleaned it out... but as much of it as there is in there... that would be a LOT of stuff hiding out in there... I don't have a good feeling about this...



So, going to drain tomorrow and refill see if it straightens out... will keep you updated as well...



I must say that the RP folks are really topnotch... really good customer service.



steved

 

[steved]

Well, took the time tonight to change this stuff out with the new RP... drained it, pulled both PTO covers, fished the magnet out, sopped up as much fluid as I could... took over 30 minutes for it to quit running in...



Buttoned it back up... took it for a drive... just like before... shifts perfect, glids easily down the road... awesome!



Now to see how long this lasts... got a quart of the old stuff to send to RP...



steved

 

[MMeier]

I hope not... since it is too heavy.



steved

Really, the people I got the trans from said that is the only thing to run in a 5600. On the bottle it says it is formulated for it also. Now for the kicker,here it is 2 weeks and 4900 miles later and I have some noise from the damn thing when it gets warm/ hot!! WTH? #@$%! Anyone else with thoughts on this?

 

[Gary - K7GLD]

I've tried both Amsoil and Redline MTL in my transmission - not because of any issues, just to see if there was any noticeable improvement based on raves of other users...



The Amsoill stunk - immediate gear grinding between 2-3 and 3-4 - it came out immediately.



MTL was better, but not as good as the OEM stuff - drove it maybe 10K miles and drained it - and immediately got my smooth shifting transmission back again.



I don't plan any more "experiment$" with my transmission - the OEM stuff does just fine!



Like Vaugn sez - hard to predict with these trannies and differentials - what works well for one guy, often falls on it's face for the next...

 

[CumminsPower98]

I put about 100k on my last fill of Amsoil MTF. It was starting to feel a little more scratchy. The oil came out looking really good. The new oil didn't improve the shifting at all. Is the OE stuff synthetic and are there different flavors or revisions of it? Maybe I should try it some time.

 

[steved]

Really, the people I got the trans from said that is the only thing to run in a 5600. On the bottle it says it is formulated for it also. Now for the kicker,here it is 2 weeks and 4900 miles later and I have some noise from the damn thing when it gets warm/ hot!! WTH? #@$%! Anyone else with thoughts on this?

The MT-90 is the fluid you should have in the NV4500 (5spd)... the MTL is for the NV5600 (6spd).



I plan on driving the truck today and tomorrow to see how things hold up...



steved

 

[GMcLeod]

I'm curious as to why you would want to change the OEM oil. If I recall right, the OEM oil is synthetic and will do the job just fine. Keep in mind you have to change the trany fluid like any other fluid, so why spend extra money for a after market product when to OEM fluid never exceeds it's useful life? Keep the OEM fluid and spend your money on something useful. Not trying to pi** off anyone just my meager two cents?



If it ain't broke don't fix it!

 

[MMeier]

The MT-90 is the fluid you should have in the NV4500 (5spd)... the MTL is for the NV5600 (6spd).



I plan on driving the truck today and tomorrow to see how things hold up...



steved

Then why does the MT90 bottle say its for the 5600?

 

[CumminsPower98]

I personally never had OE fluid as my NV5600 was un upgrade I did...

 

[MMeier]

I'm curious as to why you would want to change the OEM oil. If I recall right, the OEM oil is synthetic and will do the job just fine. Keep in mind you have to change the trany fluid like any other fluid, so why spend extra money for a after market product when to OEM fluid never exceeds it's useful life? Keep the OEM fluid and spend your money on something useful. Not trying to pi** off anyone just my meager two cents?



If it ain't broke don't fix it!

Mine did break, and I would like to try to avoid that if at all possible. I think I'll pick up some Pennzoil stuff and see if my newfound noise goes away..... otherwise!

 

[steved]

I'm curious as to why you would want to change the OEM oil. If I recall right, the OEM oil is synthetic and will do the job just fine. Keep in mind you have to change the trany fluid like any other fluid, so why spend extra money for a after market product when to OEM fluid never exceeds it's useful life? Keep the OEM fluid and spend your money on something useful. Not trying to pi** off anyone just my meager two cents?



If it ain't broke don't fix it!

If the replacement fluid is equal to or better than OEM, why not...



They are pretty confident that the RP cleaned the transmission up and the garbage it cleaned up floating around caused the hard shifting...



steved

 

[nps]

They are pretty confident that the RP cleaned the transmission up and the garbage it cleaned up floating around caused the hard shifting...



steved

This would be the best case scenario for them. I'd take it with a grain of salt though, unless an independent lab analysis produced the same conclusion.



Are they offering any theories about where all of the garbage came from and why you seem to be somewhat of an isolated case with this experience?



Unfortunately only time will tell if the missing parts 'cleaned out' by RP were really attached just before the RP went in.

 

[GMcLeod]

If the replacement fluid is equal to or better than OEM, why not...



They are pretty confident that the RP cleaned the transmission up and the garbage it cleaned up floating around caused the hard shifting...



steved

My dilemma became running High $$$$$ Amsoil in my DTT Trans until I realized I couldn't justify the cost if I followed the yearly change interval recommendations from DTT. Kind of a double edge sword... Da* if you do, Da* if you don't!!!!

 

[jleons]

Hello

Sorry to hear about your problems w/ RP. I have been using this same product in my 96 - 2500- NV4500 for twenty five thousand w/ great success. I hate to hear bad things about a good product; to me.

Good luck.

JL

 

[steved]

Hello

Sorry to hear about your problems w/ RP. I have been using this same product in my 96 - 2500- NV4500 for twenty five thousand w/ great success. I hate to hear bad things about a good product; to me.

Good luck.

JL

The good thing is they are actually "concerned" about what happened and not just turning a deaf ear...



And FYI, in my 04 manual, there is no scheduled oil change for the NV5600...



steved

 

[PKleine]

I recently dumped out the Redline MTL after about 45k miles. The shifting was getting harder and it was time to install some Fast Coolers. The Redline wasn't red anymore. I removed the flat magnet, cleaned off the debris and put it back in.



I used the new Amsoil product this time. The shifting is good again.



PK

 

[steved]

I have put about 75 miles on it so far... seems to be fine... it was sorta wierd draining the fluid...



When I initially popped the bolt out of the bottom and the sample from there (3 ounces) was metal flaked... an hour later, the rest of the fluid looked to have just a touch of metal flake in it and it was dirty... the magnet was still clean for the most part...



I'm going to be happy if this fluid stays as is, it really is an improvement over OEM and PZ fluid.



steved

 

[WDixon27]

i replaced the god knows what that was in my 4500 with rp 75w90 a couple tanks of fuel ago and it shifts much better now, the occasional crunch going into 3rd is long gone even when hauling butt

 

[DunnJ]

I had my STUPID delaer Tommy Manuel Ft. Worth) change the transmission lube. Almost immediately I started to experience grinding shifts as the synchros were not working. I looked at the service order and he put the 75-90 gear lube in. Had another dealer (Petro Bro. Warsaw, IN) replace the 75-90 with the correct lube on Thursday. 3 days and 900 miles later I have no grinding and the trans is shifting smooth again.

Jerry

05 SLT

252643 miles

6 Speed NV 5600