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Old Oct 11, 2010 | 10:23 AM
  #41  
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Originally Posted by LoneStarFRC
GM discontinued licensing ALL Dexron III, and there had to be an acceptable replacement/substitute. That's the reason.
Huh. I thought it was due to the thousands of transmission that have been destroyed......using Dexron III................
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Old Oct 11, 2010 | 10:42 AM
  #42  
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Originally Posted by lucky131969
Huh. I thought it was due to the thousands of transmission that have been destroyed......using Dexron III................
Now behave yourself Mike.
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Old Oct 11, 2010 | 11:05 AM
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Originally Posted by lucky131969
Huh. I thought it was due to the thousands of transmission that have been destroyed......using Dexron III................
Wow, harsh! I don't think I would put the GM substitute in an automatic transmission though, it's a little thick for that. I wonder what GM recommends for autos that use to use Dex III. Geezzzz Lucky, take a chill pill, didn't mean to enrage you!
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Old Oct 11, 2010 | 11:07 AM
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Originally Posted by Jim in Mich
Wow, harsh! I don't think I would put the GM substitute in an automatic transmission though, it's a little thick for that. I wonder what GM recommends for autos that use to use Dex III. Geezzzz Lucky, take a chill pill, didn't mean to enrage you!
Oh settle down mom.... LoneStarFRC knows I'm joking.....
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Old Oct 11, 2010 | 11:07 AM
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Originally Posted by LoneStarFRC
Now behave yourself Mike.
hehehe.....
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Old Oct 11, 2010 | 11:09 AM
  #46  
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Originally Posted by Jim in Mich
Wow, harsh! I don't think I would put the GM substitute in an automatic transmission though, it's a little thick for that. I wonder what GM recommends for autos that use to use Dex III. Geezzzz Lucky, take a chill pill, didn't mean to enrage you!
The thread topic (and the subject of both mine and Lucky's comments) relates to T-56s. Got nothing to do with autos.

GM recommends Dexron VI for them.
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Old Oct 12, 2010 | 02:03 PM
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I was having trouble getting my car into 1st gear when I would come to a stop. The shifter was actually part way into 1st, so when I would start off it would pop out of gear and make a nasty noise. I switched to the Syncromesh many years ago and though it took a few months, never had that problem again and all of the shifting has been easier.

It comes in a yellow bottle witht he typical pointed top at any auto parts store.
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Old Oct 12, 2010 | 03:34 PM
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Originally Posted by FASST LN
I was having trouble getting my car into 1st gear when I would come to a stop. The shifter was actually part way into 1st, so when I would start off it would pop out of gear and make a nasty noise. I switched to the Syncromesh many years ago and though it took a few months, never had that problem again and all of the shifting has been easier.

It comes in a yellow bottle witht he typical pointed top at any auto parts store.
What were you running prior to the switch?
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Old Oct 12, 2010 | 05:17 PM
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Originally Posted by LoneStarFRC
The thread topic (and the subject of both mine and Lucky's comments) relates to T-56s. Got nothing to do with autos.

GM recommends Dexron VI for them.
I know, I was the one that started the thread. The point I was trying to make is that if DexIII was so great in the manual why didn't they recommend Dex IV for the replacement for the T-56? Instead they went to a regular gear type oil not an ATF of any kind. Not even the synthetic kool aid!
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Old Oct 12, 2010 | 09:03 PM
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Originally Posted by Jim in Mich
I know, I was the one that started the thread. The point I was trying to make is that if DexIII was so great in the manual why didn't they recommend Dex IV for the replacement for the T-56? Instead they went to a regular gear type oil not an ATF of any kind. Not even the synthetic kool aid!
Not Dex IV, it's Dex VI which is the current product GM recommends for retrofitting to all automatics. Dex VI was formulated for fuel efficiency purposes mostly, but according to GM, unsuitable for use in T56s that originally specified Dex III. GM discontinued all licensing of Dex III and needed to come up with a replacement for it's T56 customers. This has created a HUGE amount of confusion for many people. Does the fact that GM no longer licenses (meaning the product can call itself "Dex III") mean that there is no more Dex III available for purchase. NO, it does not. It means that all the companies that were previously producing Dex III (and there are/were several) can still produce and sell the same product they did previously but CANNOT call it "Dex III". "Dexron III" is a registered trademark and belongs to GM, remember? They (these various manufacturers) can say it's "suitable" for use where Dex III was recommended, or they can say it's "recommended" for use where Dex III was used/recommended and not get into legal trouble with GM.

Bottom line, yes you can still buy Dex III from several different sources (both mineral AND synthetic) because it's actually the SAME product formulation they were using before.

Clear now?
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Old Oct 13, 2010 | 07:19 AM
  #51  
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My next question would be the compatibility of the Pennzoil lube with the synthetic that I currently have in my tranny. As many of us have found out, you don't get a "full drain" from the drain plug, when doing a gear oil change.
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Old Oct 13, 2010 | 09:23 AM
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I was running whatever the previous owner had in there. Probably what came from the factory.
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Old Oct 18, 2010 | 12:52 AM
  #53  
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Originally Posted by FASST LN

It comes in a yellow bottle witht he typical pointed top at any auto parts store.
I stopped into my local Advance to pick up some and when I saw the bottle and read "for manual transmissions" I was hesitant to buy it because I thought our transmissions used ATF. I presently am running RP Synchromax but it's time for a change and I think the shifting isn't as smooth as it was. So the yellow bottle with the pointy cap, "Pennzoil Synchromesh" is the right stuff? Guess I'll be stopping back.
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Old Oct 18, 2010 | 08:43 AM
  #54  
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Originally Posted by striper
I stopped into my local Advance to pick up some and when I saw the bottle and read "for manual transmissions" I was hesitant to buy it because I thought our transmissions used ATF. I presently am running RP Synchromax but it's time for a change and I think the shifting isn't as smooth as it was. So the yellow bottle with the pointy cap, "Pennzoil Synchromesh" is the right stuff? Guess I'll be stopping back.
That's the stuff, try it you will like it! It's true you can't get a complete drain, I think the lube in the cooler doesn't drain out. I will probably run this a year or so and then do a change again, that should purge most of the ATF out.
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Old Oct 18, 2010 | 09:19 AM
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Changed to Royal Purple about 3 weeks ago in my 2000 c5 and have NOT noticed any difference in the shifting "smoothness".

I may give Pennzoil a try; thank you.

Good topic.
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Old Oct 18, 2010 | 11:19 AM
  #56  
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Originally Posted by bontrager
Changed to Royal Purple about 3 weeks ago in my 2000 c5 and have NOT noticed any difference in the shifting "smoothness"

Good topic.
The only difference people notice is in their heads!
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Old Oct 18, 2010 | 11:22 AM
  #57  
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Old Oct 18, 2010 | 11:23 AM
  #58  
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Originally Posted by ztheusa
The only difference people notice is in their heads!
Not being able to get the car into first gear while at a stop prior to the change, and then no issues after the oil change, is not in my head. It is a fact.
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Old Oct 18, 2010 | 12:34 PM
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lol i may notice...i havent even changed mine yet and ive had it a long time now:o...
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Old Oct 18, 2010 | 12:37 PM
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I have to respectfully disagree with the gentlemen who say any shifting difference after a fluid change is in the changer's imagination. When I bought my 4000-mile '03 Coupe a couple of years back, I found the shifting so abysmal I thought something was wrong with that particular trans. Then I drove a couple other C5 manuals and discovered they all suck in the shifting department. Before dumping the car (I basically liked the C5 otherwise) I tried Royal Purple and it definitely helped. Wasn't a night-and-day difference but was enough of an improvement that I didn't feel like getting rid of the car (still have it). I mean, the shifting still blows, but was better after the change. May try the Pennzoil; please, anyone who has gone from RP or the GM Synchromesh to Pennzoil report in if you would.
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