Tune, resistors and tcc

[dbrannon79]

shows Dextron VI 7.7 quarts

 

[dbrannon79]

Dex VI is a synthetic fluid too. if I'm not mistaken Dex III was gm spec but the newer versions of Dex are supposed to supersede the older ones. at least that is what I am told. there should be some spamping on the dipstick that will show the GM spec numbers for your trans

 

[Stoney]

Yeah but ain't that the one that's been messing up these older tranny's?

 

[Stoney]

What I'm concerned with is on the old transmission when I did a fluid and filter change on it we put Dex Merc in it and that was the day that it started acting up and was never right again. So I just want to make sure I put the right stuff in this one.

 

[dbrannon79]

That would be a good question for @THEFERMANATOR

look at the dipstick and see if there are any GM numbers on there. I can try crossing it while I'm at work

 

[dbrannon79]

Don't know if this will help but I found this TSB online for the fluid. I looked up the fluid spec on AAP for my 1995 and it shows the same Dex VI same amounts

 

[Will L.]

DO NOT USE DEXRON6 in a 4l80e.

Transynd is the wazoo atf, but it is crazy expensive.
My suggestion would be just any descent brand like mobil or valvoline dexron3.

 

[Stoney]

Ok so take the Castrol dex/Merc back and get Dex III

 

[dbrannon79]

Just looked at my dipstick on my 95. It shows dex 3 only

 

[Jaryd]

I know it’s already been said but the only converter from a gasser that matches the 6.5 is the big block gasser converter. They have the same stall speed. The transmissions would be the same if it’s coming from a 97 or 98.

On the trans cooler and lines — The problem with flushing behind a slipping converter or transmission is it sends the debris through them and you can’t get all of the debris flushed out no matter how many times you flush it. But I’m sure there are 10’s of thousands of vehicles running up the road right now by flushing and most of them probably last a while. But if you really wanted piece of mind the only way to get it would be replace the cooler and lines.

 

[Stoney]

@ Jaryd Ok I got the number off the side of the converter. Anyone know how to tell if it's the one I need? It came out of a 97 Astro van with a 5.7 V8 in it.( They wrote it all on the tranny) . the number on the converter is k156k3. My friend still hasn't brought me the converter he said he has, and AutoZone has one at the store for me. (Ordered it just in case ). I really can't afford it but I will if I absolutely have to. Kinda stuck till I know what I'm doing...I doubt AutoZone or other store has the cooler and lines in stock and I'm running out of time unfortunately...guess I'll be taking my chances

 

[Stoney]

BTW that converter number is the one one of the converter that is in the truck not on the donor tranny...gonna go get that number right now.. it's k 198k3

 

[Husker6.5]

The converter out of that 5.7L '97 Astro Van is NOT the right converter! The ONLY gasser converter that will work is the one behind the 7.4L (454) BBC! It is the exact same converter that is behind the 6.5 in '94-'99. You need the MT1 RPO code.

 

[Stoney]

Mt1 rpo?

 

[ak diesel driver]

In the jockey box is a tag that lists the RPO codes, usually 3-4 letters

 

[Stoney]

Ok dumb question...on the tranny lines, to get them off the tranny...do I have to pop out the clips and take them off that way or can I just unscrew them from the body of the tranny...they look like they can be unscrewed from tranny..but they also have the little metal clips holding the actual line...

 

[ak diesel driver]

How to Decode General Motors RPO Codes | NewGMParts.com

www.newgmparts.com

.

 

[Stoney]

In the jockey box is a tag that lists the RPO codes, usually 3-4 letters

No bueno... Don't have the glove box lol

 

[ak diesel driver]

clips, don't unscrew the fittings especially the rear one.

 

[Stoney]

So was he saying that "mt1" is the rpo code for mine?