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Trans fluid-synthetic or no??
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QuickNick
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PostPosted: Fri Jul 03, 2015 7:02 pm    Post subject:  Trans fluid-synthetic or no?? Reply with quote

I did a quick search but failed Embarassed

Next weekend I'm adding a Trans Go shift kit (just the accumulator springs really) & a tranny cooler. Reason being is that if I'm going slow, doing repeated slow stop & starts it progressively shifts harder & harder into all gears. Its fine on normal driving, just ongoing slow driving has issues. I'm hoping its just overheating.

I did a fluid/filter change over the winter (about 10K ago) and used Lucas tranny fluid. It was supposed to be compatible but I'm convinced its not & want it out.

Should I go with synthetic fluid solely because it runs cooler?? I'm a little hesitant since I'm not flushing it, just changing it. I have 3 gallons of Valvoline Dex 3 but dont want to keep doing this. Hoping I havent done too much damage so far but I'll see what kind of junk is in the pan. crossing fingers! Hopefully I wont be asking for tips rebuilding this trans next Laughing

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PostPosted: Sun Jul 05, 2015 12:37 pm    Post subject:   Reply with quote

If you do any additives, use lubegard red. Also, be sure to take a scotch brite pad to the bores of the accumulators.
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PostPosted: Sun Jul 05, 2015 6:15 pm    Post subject:   Reply with quote

I would disconnect the ATF return line at the rad & flush out the fluid that way. Did that many times before on my Dodges. Get rid of all the Lucas, & have 100% Dexron. Easy to do with none of the risks of a flushing machine. GARY

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PostPosted: Mon Jul 06, 2015 12:42 am    Post subject:   Reply with quote

9C3 wrote:
I would disconnect the ATF return line at the rad & flush out the fluid that way. Did that many times before on my Dodges. Get rid of all the Lucas, & have 100% Dexron. Easy to do with none of the risks of a flushing machine. GARY


How common is it for transmissions to start acting up or get damaged from using a flush machine? I've heard it's not recommended from various sources, but is it really true?

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PostPosted: Mon Jul 06, 2015 12:50 am    Post subject:   Reply with quote

BaseLS wrote:
9C3 wrote:
I would disconnect the ATF return line at the rad & flush out the fluid that way. Did that many times before on my Dodges. Get rid of all the Lucas, & have 100% Dexron. Easy to do with none of the risks of a flushing machine. GARY


How common is it for transmissions to start acting up or get damaged from using a flush machine? I've heard it's not recommended from various sources, but is it really true?
There's plenty of guys on this forum who swear it's the worst thing possible. In my case, I had my trans flushed at the dealer, but the tech did not add the detergent chemical to the flushing machine. He said that was the problem with trans flushes. It's been almost 3 years, & 25,000 miles, & the trans still shifts like new. But I bet there's plenty of others guys here who would have not taken the chance. GARY

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PostPosted: Mon Jul 06, 2015 9:02 am    Post subject:   Reply with quote

Do not use full synthetic!!

It's too slick for our transmissions. Especially if yours already has a lot of miles on it. It would slip like nothing else.

My recommendation,... buy a small, auxiliary cooler to mount in front of the radiator, and run Dexron VI. Add the cooler by tapping into the return line to the transmission so you get the most cooling available. It will keep your transmission much happier being cooler. It's not a hard job and well worth the money.

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PostPosted: Mon Jul 06, 2015 11:31 am    Post subject:   Reply with quote

This is great advice. I have put auxiliary trans coolers on my cars since the 70's. Since my Impala is a 9C3 car, it has all the coolers I could ask for. Engine, PS, & trans. Keeping the trans temp down adds to the life of the fluid, & trans. GARY

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PostPosted: Mon Jul 06, 2015 11:49 am    Post subject:   Reply with quote

ZSPOT wrote:
Do not use full synthetic!!

It's too slick for our transmissions. Especially if yours already has a lot of miles on it. It would slip like nothing else.

My recommendation,... buy a small, auxiliary cooler to mount in front of the radiator, and run Dexron VI. Add the cooler by tapping into the return line to the transmission so you get the most cooling available. It will keep your transmission much happier being cooler. It's not a hard job and well worth the money.



What brand of transmission cooler would you recommend?

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How much miles are on those seats? How much pounds of ass were applied to the seat during every trip? Lol

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PostPosted: Mon Jul 06, 2015 12:08 pm    Post subject:   Reply with quote

I would go to the local U-Pick & grab a factory cooler off a Chevy truck. When I go to the local one, I pass the truck section before getting to the GM car section. It's amazing how many pick ups, & vans come with coolers. They're like $10. Also get as much of the metal pipe, & mounting brackets as you can. Or maybe there's an Impala cop car that has a factory cooler. GARY

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PostPosted: Mon Jul 06, 2015 12:15 pm    Post subject:   Reply with quote

Doesn't really matter a whole lot. Just make sure you use transmission oil resistant, rubber line. It will seep through if regular vacuum hose or fuel line is used.

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PostPosted: Mon Jul 06, 2015 12:46 pm    Post subject:   Reply with quote

Thanks guys. I'm trying to get this trans too last a little while longer and I'm afraid to change out the black water inside the trans with new fluid. I'm certainly going to look into the cooler route.

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How much miles are on those seats? How much pounds of ass were applied to the seat during every trip? Lol

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PostPosted: Mon Jul 06, 2015 3:36 pm    Post subject:   Reply with quote

You can get brand new coolers for $30, worth the investment

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PostPosted: Mon Jul 06, 2015 6:48 pm    Post subject:   Reply with quote

Thanks all Wink
I did get a generic "Hayden" 3-pass tranny cooler to add in while I'm at it. Not the best thing but there but better than nothing. I never even thought of hitting the junkyard & looking for a factory cooler, nice tip 9C3!

I'm a Lucas Oil fan but the tranny fluid, never again. Seemed to have issues right away after swapping to their fluid. Not badmouthing them in any way, they support us greasy drag racers Cool but not again with this stuff. So, should I use the Dex 3 I have now or go Dex 4 like ZSpot said? Is it going to matter (Dex 3 or 4)? I don't really beat on the car much, sometimes it just sits for weeks. Other times I'll just use it for a daily runner, other times it goes on a road trip.

Thanks again, appreciate all the help!

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PostPosted: Mon Jul 06, 2015 6:56 pm    Post subject:   Reply with quote

Dexron 3 is perfectly fine, but Dexron 6 is better. It's a semi-synthetic. So you get the good sticky attributes that dinosaur oil brings. But you also get some of the free flowing, higher temp resistance, and other beneficial aspects of the synthetic.

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PostPosted: Mon Jul 06, 2015 7:34 pm    Post subject:   Reply with quote

In my case, I upgraded to Dex 6, although my 05 came with Dex 3. I don't know where you live, but the Dex 6 flows better in ice cold temps. Just flush out all that old ATF the way I described in the earlier post. Hayden coolers are fine. GARY

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