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Username Post: Trans Fluid ? For The Experts        (Topic#358111)
tcndeb 
Senior Member
Posts: 419

Loc: Texas
Reg: 04-18-04
09-19-19 09:26 AM - Post#2775883    

I had my 700r4 rebuilt a few years ago and the builder is adamant that I use either dex II or III, can't remember which. GM says dex VI is the approved replacement for all dex II and III builds, but my guy says no way. Even yelled at me about it. So the questions is, is there anything he could have done in a rebuild that would REQUIRE the older formulations? Don't want to crater my trans....

'92 Full Size Blazer


 
deckeda 
Poster
Posts: 77

Reg: 08-13-18
09-19-19 12:42 PM - Post#2775889    
    In response to tcndeb

I'm no expert but when one product is described as a replacement part, you'd have to have a really good reason for not using it.

Can you even buy Dex II or Dex III anymore? In another example, can you even buy ancient specifications of motor oil anymore?

I went through something "similar" couple years ago when flushing out my Tacoma's trans. Like GM, Toyota has gone though several improved versions over the years of "their" trans fluid.

I eventually made my way to Valvoline Max Life. Not inexpensive! But it meets basically every auto trans need you're likely to run into. And my trans shifts better than ever, pulling any trailer I care to abuse it with, with 168,xxx miles on it. (30,xxx miles since the trans change.)

'89 C3500 dually 2WD, 4-sp (SM465)


 
454cid 
Valued Contributor
Posts: 3121

Age: 46
Loc: West Michigan
Reg: 02-18-12
09-19-19 06:58 PM - Post#2775922    
    In response to deckeda

  • deckeda Said:


Can you even buy Dex II or Dex III anymore? In another example, can you even buy ancient specifications of motor oil anymore?



Dexron III completely replaced II... it's available anywhere and everywhere. It's not the same as going from an SM to an SN oil.

99 K3500 RCLB


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2749
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
09-19-19 07:48 PM - Post#2775929    
    In response to 454cid

I ask you this. How many miles did you get out of the trans before the rebuild?
If the transmission was originally designed with that fluid then there is nothing wrong with continuing to use it.
If newer is compatible then that may be ok too.
Also note that the dex 6 is nearly twice the price of the 2 or 3.
Just my opinions

Old School GM fan FOREVER


 
tcndeb 
Senior Member
Posts: 419

Loc: Texas
Reg: 04-18-04
09-19-19 08:20 PM - Post#2775932    
    In response to rockfangd

I agree with your point, but the guy who did the rebuild was so adamant I was trying to get some concrete info.
Is there something he could have done during a rebuild that would REQUIRE dex 2 or 3?
Hard parts that he could have used? Shear requirements on something? I just have zero experience with auto trans.

'92 Full Size Blazer


 
deckeda 
Poster
Posts: 77

Reg: 08-13-18
09-20-19 04:50 AM - Post#2775940    
    In response to tcndeb

Couple of thoughts ... if the manufacturer says IV is now the way to go, that advice carries weight. There’s no way to know why the builder said some potentially unobtainable fluid is critical without asking him, but I get what you mean, like is it “known” among experts this is true.

I’d wager “no,” but I’d also wager that anyone who yells (really? Yikes) has some understanding of some aspect of it he’s incapable of communicating as an adult. It could also mean he’s wrong and supremely frustrated about it.

Without actual builders chiming in here, consider calling up some shops. Or maybe contact places that sell parts and asking if certain clutches or whatever demand old oils.

I’d add a trans cooler to the truck if there isn’t already one. Many sins in the fluid can be excused by simply lowering fluid temp.

'89 C3500 dually 2WD, 4-sp (SM465)


 
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