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Trans Fluid change question

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solace22

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Trying to keep the 700r4 alive a bit longer. A while back the adapter between the trans and tcase was leaking, lost all my fluid. I refilled it with oreily's stuff, leak fixed. Now id like to change the filter, swap the pan, and add a temp sensor. What I am wondering is will the torque converter have enough old stuff to matter. I dont think the fluid is bad or anything like that I just realize its gonna mix with the new. Am I overthinking it?
=D
 
With the service you suggest you will be leaving 5 or more quarts in the system of the old fluid. If the old fluid is still clean and pink I wouldn't worry about mixing.
 
Yeah, I'll double check it but I don't think it's bad. Heck if it's good enough I'll save some for an emergency or something. Haha

any certain brand you recommend me putting in? I dont tow or anything like that, just run 35's.
 
If you run a big tire and are not geared accordingly it puts tremendous strain on the trans. If you can afford it, run synthetic fluid, it will mix fine with what you have in there now and has a greater resistance to heat break down.
 
Im thinking I have 4.10's. Previous owner swapped in what appears to be the drivetrain from a 70's 3/4 truck. (dana 44 front, np205, 14 bolt rear)
Ill see if I can swing synthetic, I know its pricey.
 
You may find better deals if you can buy it in bulk--like in 2 or 5 gallon pails..

I've gone to a local quickie lube place close to home when I was in a bind and asked if they would sell me some ATF one day last winter,to fill my plow pump,it blew a hydraulic hose --the guy doing the oil changes said "you have a container"?--I had an empty 5 gallon pail in my truck,he filled it over halfway full,and said "give me 5 bucks"--I guess the boss wasn't around!..

Greg Ducato--I've read many threads online about many racers ,truckers,farmers, using universal tractor hydraulic fluid in older GM transmissions,that claim it works better than Dextron,lowers the stall speed slightly,and firms up the shifts ...any experience or thoughts on that ?..
 
Certainly not countering Greg's expertise, but if cost is an issue and you'll go through a bunch, this might save a significant amount: http://petroleumservicecompany.com/...nnelid=FROOG&gclid=CLzW7cLuzcoCFVUlgQod7skD9A

FWIW, when talking quantity, I did ask about shelf life for it, which is the same that I was told by Mobil on their engine oil:

"You are welcome to give me a call at 1-800-428-xxxx ext. 3020, or my direct number is 870-400-xxxx, if you have a specific question. The anticipated shelf life for a sealed container of ATF, that has been properly stored (in doors, in a temperature controlled environment) is five years.

Gary Whiteside
Corporate Vice President
Quality & Technology
Warren Oil Company, Inc."

I have a habit of buying stuff on clearance or bulk when on sale, but in my case, it's hard to run through some types of fluid fast enough to be even close to that five year mark.
 
Manufacturers demand specific blend properties for the fluids recommended for use in their transmissions. There are differences in friction modifiers that can change shift feel and timing. If you use a non specified fluid in your trans you can risk clutch slip or chatter under some conditions or harshness and delamination in others. Unless the fluid is labeled as universal and meeting Dexron specs I would be wary of using it in my street driven vehicle.
 
Greg Ducato said:
Manufacturers demand specific blend properties for the fluids recommended for use in their transmissions. There are differences in friction modifiers that can change shift feel and timing. If you use a non specified fluid in your trans you can risk clutch slip or chatter under some conditions or harshness and delamination in others. Unless the fluid is labeled as universal and meeting Dexron specs I would be wary of using it in my street driven vehicle.
Click to expand...

So just get dexron stuff and gtg?
 
A good quality gasket and a straight pan rail will seal up fine. Put the pan along a straight flat surface and lightly tap down the bolt holes on the trans side that may have bumped up from previous tightening.
 
Greg Ducato said:
A good quality gasket and a straight pan rail will seal up fine. Put the pan along a straight flat surface and lightly tap down the bolt holes on the trans side that may have bumped up from previous tightening.
Click to expand...
putting a new pan on, kinda why I figured id just throw the lube locker one on and everything be nice and new and mostly worry free lol
 
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