G56 gear fluid

[SierraRam]

Drained and replaced mine with the Mobil Delvac 50, much quieter! I do not notice a change on shifting force but it sure sounds better.

 

[RVTRKN]

I have two more months to wait, for my upgrade.

 

[mfurrh55]

Drained and replaced mine with the Mobil Delvac 50, much quieter! I do not notice a change on shifting force but it sure sounds better.

How many quarts did you use?, Monte

 

[SierraRam]

How many quarts did you use?, Monte

Approximately a little over seven, overfilled a little.

 

[mfurrh55]

Approximately a little over seven, overfilled a little.

Ok, Thanks, Monte

 

[Eliminator]

OK, I read al this and since I am a Amsoil guy I checked with their Tech Dept and they advised their product FTF 05 , 50w Syn Transmission Oil is
compatible with Mobil Delvac 50. So I ordered 5 ga, smallest quanity you can order, $183. 75 for 5 gallon (20 qts), little over $9. 00 a qt. Changed mine
last week-end, was using Amsoil ATF, truck has 73,000 miles on it. Well it was in the low 70's so don't know about cold weather but I like it real good.
Shifts really good, best ever, I have a SB DD clutch assy. Much quiter than the ATF too... . has always been a little hard going to reverse, not now. Will
advise after I do a good trailer pull.

 

[EDankievitch]

I've found that if it's below 40 outside in the am shifting is very slow. after about 3 to 5 miles shifting is very silky smooth. It would be awesome if they made this gear lube as a 15-50 wt than cold weather shifting would be better.

 

[RVTRKN]

Try warming up the trans in 4th gear with the transfer case in neutral, and if you have the high idle feature, set it for 12-1500 RPM while warming up your truck. You should notice a difference.

 

[NIsaacs]

There is a thread simular to this one on another forum, started in 2011 and is still going. The question that keeps coming up is: "Can we use the Mobil Delvac 50 in our transfer case"? Some are, however I don't think that is a good idea due to the oil pump they use. I would think the 50w would be too thick in the winter to pump, causing low or no lube upstairs or maybe even destroying the pump. Thoughts?



Nick

 

[RVTRKN]

Here is a email response that I got from TDR member CKelley1, when I asked specifically about the sae50 in his transfer case. I do plan to use it now, after getting this e-mail, he has a fleet of 4X4 CTD's and has not had an issue as of the email.





CKelly1

"We use the unblended 50 weight oil in the transfer case, the chain turns continuously not just in 4 wheel drive. We had a 03 seal go bad and did not catch it in time, it had the factory atf in it. We overhauled it and in seeing how it worked we could see the sae50 was the perfect oil for it. we then changed the rest of the fleet out to the 50. "

 

[NIsaacs]

Humm, thats interesting. Now that I think about it the 3rd gen uses a NP273 without an axle disconnect, so yes, the chain does turn and lube, they may not use an oil pump like the 2nd gen 271?



The old NP 203 with a Doug Nash part time kit installed was hard on the pocket bearing due to the chain not turning and pulling the oil up to the top.



Nick

 

[seafish]

Here is a email response that I got from TDR member CKelley1, when I asked specifically about the sae50 in his transfer case. I do plan to use it now, after getting this e-mail, he has a fleet of 4X4 CTD's and has not had an issue as of the email.


CKelly1
"We use the unblended 50 weight oil in the transfer case, the chain turns continuously not just in 4 wheel drive. We had a 03 seal go bad and did not catch it in time, it had the factory atf in it. We overhauled it and in seeing how it worked we could see the sae50 was the perfect oil for it. we then changed the rest of the fleet out to the 50. "

RV, PLEASE clarify, do you mean the Delvac 50, or another 50w gear oil, or 50w lube oil ???

 

[NIsaacs]

RV, PLEASE clarify, do you mean the Delvac 50, or another 50w gear oil, or 50w lube oil ???

I don't think CKelly uses Delvac 50 but does use a high quality 50 wt synthetic manaul transmission fluid mixed half and half with 5/30 synthetic manual transmission fluid in his G-56's. It looks like he uses the straight 50 wt in the transfer cases. See post 5 at the start of this thread.

I dont have a G-56 but I changed out all my trucks trannys and even the '05 Neon with Valvoline HD synthetic trans 50 wt. manual transmission fluid. All standard fill and used up all but one quart of a 5 gallon bucket, $210. I don't have much run time yet but preliminary results are good.

Nick

 

[RVTRKN]

Well well well, now that the transmission has been inspected and the DMF has been replaced with a SMF with a SBC DDS 3250 clutch and I have 600 miles on the Mobil trans SHC DC, MB recommended oil, I dumped it and saw light gold flakes in the oil which should indicate that the synchronizer's didn't like it. So I'm going to go with member CKelley1 recommendation, which he has been running for a very long time and heavy towing miles. His oil blend is the Mobil delvac transmission 50 sae fluid and Royal Purple synchromesh, at a 50/50 blend. The trans runs close to the same temperature with the SHC DC or Pennzoil synchromesh in it, at @ 200*. The pennzoil synchromesh seems too thin and is not a synthetic oil, and at the high temperature the G56 seems to run at, that have been reported, have a wide range from 180* to 250* should require a synthetic. Knowing that CKelley1 has lots of miles on his blend, it will be the last oil my trans will see, I'm going to stick with it for the long haul.

 

[Regcabguy]

Well well well, now that the transmission has been inspected and the DMF has been replaced with a SMF with a SBC DDS 3250 clutch and I have 600 miles on the Mobil trans SHC DC, MB recommended oil, I dumped it and saw light gold flakes in the oil which should indicate that the synchronizer's didn't like it. So I'm going to go with member CKelley1 recommendation, which he has been running for a very long time and heavy towing miles. His oil blend is the Mobil delvac transmission 50 sae fluid and Royal Purple synchromesh, at a 50/50 blend. The trans runs close to the same temperature with the SHC DC or Pennzoil synchromesh in it, at @ 200*. The pennzoil synchromesh seems too thin and is not a synthetic oil, and at the high temperature the G56 seems to run at, that have been reported, have a wide range from 180* to 250* should require a synthetic. Knowing that CKelley1 has lots of miles on his blend, it will be the last oil my trans will see, I'm going to stick with it for the long haul.

Should have seen my oil after 45 miles of Gorilla Juice. Drained oil looked like someone had successfully mined for gold. Thankfully,I got that crap out of there.
We strained the oil afterward through a black t-shirt and there really wasn't that much. I can't imagine with a few thousand though.

 

[RVTRKN]

There's a thread on another CTD site that took a picture of just that, with GJ as the lubricant. The gold flakes in mine were very faint, but they were there, I believe the heavier the oil the worse it will be. Knowing that ATF is a very thin oil, is the reason why I want to use CKelley1 blend, also in theory the thinner the oil the easier the heat transfer, although I didn't see that when I went to Pennzoil synchromesh. I went to Pennzoil because its thinner and experimented with the heat transfer, but the transmission seemed to run at the same temperature @ 200*, but its not a synthetic oil and with the high temperatures the G56 runs at, warrants a synthetic. Besides, it seemed harder to shift with the Pennzoil synchromesh.

 

[RVTRKN]

Got the CKelley blend in today, and even though I only have 15 miles with the oil in the trans, so far I'm impressed. It's shifting easier, and to my surprise it's quieter than the other oils. I haven't driven it enough to get a base running temperature, but I will tomorrow, I'll be driving to Carlsbad Ca. The Royal Purple synchromesh is too thin by itself, although it probably would be OK seeing how ATF is close to the same.

 

[Regcabguy]

I just returned from Carlsbad. Nice along the coast here. Surprisingly,no traffic southbound either. Yeah,the 50 wt synthetic of your choice and 5-30 synchromesh seems to be a good compromise. Now for the iron case.

 

[RVTRKN]

I do dream at night about how someday there will be an iron case, but back to reality, it is what it is. The trans ran at 210* with a 100* day and 200* with an 80* evening. It does shift better and is slightly less noisier, but the damn truck went into regen when I was in Oceanside and drove me nuts in the hills there, with the surging throttle problem I'm stuck with since the reflash in 09.

 

[LHirshman]

Amsoilman, on page 1 of this thread, CKelly1 suggests using a 50/50 mix of SAE5-30W synthetic synchromesh and SAE50 synthetic Synchromesh. I found P/N: MTFQT-EA on AMSOIL's web site. The other straight weight manual transmission fluids listed don't say synchromesh and are not available in less than a 5 gallon pail. Can you recommend something to mix with the SAE5-30W synthetic synchromesh (P/N: MTFQT-EA) that will be compatible? I just need a total of 8 quarts. Thank you.