C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Auto trans fluid change-Tips/suggestions?

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Old Apr 17, 2017 | 05:38 PM
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Default Auto trans fluid change-Tips/suggestions?

Hey guys, going to change my trans fluid this week. Trans was rebuilt May 2015, and filled with Dexron 3. I've only put 4k miles, but I want to change it because I am weird like that. Should I flush it? Or just drain, new filter and refill? Stick with the Dexron 3 fluid?
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Old Apr 17, 2017 | 06:46 PM
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Just drain the pan, change filter and refill with Dexron 3. Mine took almost 6qts.
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Old Apr 17, 2017 | 07:24 PM
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Just drain, filter, fill should be sufficient.

Loosen the rear pan bolts first and let the fluid drain a bit that way, prevents making a bigger mess.

Torque the bolts to the correct spec (and in stages) when done to prevent leaks.
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Old Apr 17, 2017 | 07:30 PM
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Thanks guys! Not to sound dumb, but is it ok to go by "feel" when tightening? Can't find my torque wrench. If it is necessary, I'll buy another one.
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Old Apr 17, 2017 | 07:51 PM
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That's all I did. Start from the middle of the pan and work around.
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Old Apr 17, 2017 | 07:52 PM
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Originally Posted by Matatk
Just drain, filter, fill should be sufficient.

Loosen the rear pan bolts first and let the fluid drain a bit that way, prevents making a bigger mess.

Torque the bolts to the correct spec (and in stages) when done to prevent leaks.
Great tip on draining the pan.
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Old Apr 17, 2017 | 08:02 PM
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I did mine when i bought it. Went ahead and put a pan with drain from Summit on.

I went with Dex VI. Amazon has a good price on the AC Delco brand.
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Old Apr 17, 2017 | 08:54 PM
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Does it matter what brand of Dexron 3?
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Old Apr 17, 2017 | 08:55 PM
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BTW, only use the GM/delco service filter kit. here a little FYI link...

https://www.corvetteforum.com/forums...rvice-kit.html


Last edited by Joe C; Apr 17, 2017 at 08:55 PM.
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Old Apr 17, 2017 | 10:02 PM
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Thanks Joe! I remembered I asked last year, and you mentioned the filter. Thanks again
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Old Apr 17, 2017 | 10:18 PM
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Something else I just remembered - the filter has a thick o-ring/seal on the tube that slides up into the trans. Sometimes it sticks inside the trans so use a hook pick to get it out, can't install the new filter when it's stuck in there.
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Old Apr 17, 2017 | 10:21 PM
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Yup, I have a few picks. Thanks Matatk
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Old Apr 18, 2017 | 06:22 PM
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Bought the filter today from the Chevy dealer. Same part numbers as Joe C linked. I could only find Dexron -III fluid. Is that Ok? On the bottle, it says it will work for GM cars. Haven't started the job, but will tomorrow. And for a future reference to anyone doing this, this exhust bolt will be in the way of one of the trans pan bolts. I assume I'll be able to just loosen it, and move out of the way. Pic
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Old Apr 18, 2017 | 08:46 PM
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I had to move the clamp too just took a little PB blaster to get the nut moving

if the DEX -III is a known brand it should be fine
GM stopped licensing DEX-III several years back and now each company is free to make what they want and call it DEX-III compatible

when they were licensing it GM would verify the chemical makeup
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Old Apr 18, 2017 | 10:38 PM
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Thank you sir
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Old Apr 19, 2017 | 12:49 PM
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Hey guys. Filter came out with the o ring. Though I will double check to see if any o ring is still in. As far as putting the filter back in, I just lube the o ring and push it till it no longer is able to move upward?

Oh and the filter I removed says "made in China"
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Old Apr 19, 2017 | 01:12 PM
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Default tranmission bolt torque

My 1996 Corvette GM shop manual has 97 INCH POUNDS of torque for the transmission bolts. Buy a INCH POUND torque wrench, lots of Corvette bolts use INCH POUNDS, valve cover bolts and oil pan bolts.
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Old Apr 19, 2017 | 01:28 PM
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I'm paranoid. So I have to ask. Do I have the filter in correctly? I've pushed it up as much as I can. Pics

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Old Apr 19, 2017 | 01:44 PM
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Originally Posted by 1993C4LT1
Hey guys. Filter came out with the o ring. Though I will double check to see if any o ring is still in. As far as putting the filter back in, I just lube the o ring and push it till it no longer is able to move upward?

Oh and the filter I removed says "made in China"
was that the original OE filter? seems to me, the GM/delco service replacements are made in the USA -

Originally Posted by 70ZZ3 96LT4
My 1996 Corvette GM shop manual has 97 INCH POUNDS of torque for the transmission bolts. Buy a INCH POUND torque wrench, lots of Corvette bolts use INCH POUNDS, valve cover bolts and oil pan bolts.
- a small, dedicated, inch-pounder is a must for pan/VC work where, equalizing the clamping force of the hardware is a must. smaller specialty, units seem to have better accuracy than their big brother counterparts -

Originally Posted by 1993C4LT1
I'm paranoid. So I have to ask. Do I have the filter in correctly? I've pushed it up as much as I can.
best I can tell, it looks like it's installed correctly.

Last edited by Joe C; Apr 19, 2017 at 01:49 PM.
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Old Apr 19, 2017 | 01:50 PM
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No torque wrench for me, we I cant find it

​​​​​​​Thanks! Will put the pan on, and tighten by hand. Hopefully it won't leak
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