[suzukimanx]

I purchased a new "junkyard" transmission and transfer case. They drained the fluids in order to ship.

The assumption is that the fluids were the correct ones but there is no way to be certain.

What would be the suggested direction as far as the type of fluid to refill with in the AT and Transfer case.

I know this is a loaded question. I did pick up some Dexron Mercron 3 fluid which apparently is a synthetic....

Any input would be welcome

 

[aquanaut20]

Before installing new fluids, drain and change/clean the filter, flush the old lines and torque converter..

I have used Penzoil DEX III with good results

Good reading, 8 Best Dexron 3 Transmission Fluid | Buying Guide 2022 (fluidadvise.com)
.

 

[suzukimanx]

Thanks for the response!
I have purged the lines and the radiator. What is the best way to drain/flush a torque converter?

 

[Max]

What is the best way to drain/flush a torque converter?

You can't without transmission / converter removal.

Don't fall for commercial "Power Flush" services offered by some either. History has taught us that more harm than good can result as the flushing action tends to loosen normally benign sludge and particulates.

You CAN sweetin' the fluid mix by conducting a couple of pan only fluid dumps and re-top offs. That's what most do if anything.

Dexron 3 is what you need, but it does not have to be a synthetic blend.

 

[aquanaut20]

I believe he reports the transmission and Transfer case to be out (from recycling) so the torque converter is loose or removed.. and YES refrain from the power flushes,

Rather than removing the pan, I used a vacuum pump to drain the transmission, refilled, cycled, drained, repeated did this over a couple of weekends, quick, clean and simple..

 

[suzukimanx]

Max et al,

yes, the torque converter came with the new to me transmission. Part of the warranty from the junkyard was the replacement of trans filter, flushing of lines, replacement of all seals and draining/refill of the torque converter.
Question: without knowing what fluid was in it (synthetic/non synthetic) is there an issue with cross contamination by filling with a fluid which was not used prior? For instance if it was filled with synthetic, can I put non synthetic in there

 

[aquanaut20]

If you use a non synthetic you will lose any advantage of any synthetic remaining in system.. Which if flushed properly you wont have much..

 

[XL7Limited]

just fill with new fluid and drain and fill a couple more times after 100 miles. After 2-3 drain and fills, most of the old oil is gone

 

[towforce]

I have not spotted any comment about the transfer case... and the oil required ;-), After all this... lets not make a mistake and forget it!

Cheers

Martin

 

[Max]

That subject is addressed often, and additionally the info can be sourced directly from the FAQ section or by conducting one's own search here. And of course there is the Owner's and Service Manuals.

 

[fordem]

I think it's worth mentioning that the term "synthetic" is mostly marketing hype, starting with the Castrol vs Mobil lawsuit in 1998, when the courts ruled the Castrol could market their syntec product as a synthetic oil, most brands now carry a "synthetic" product which, like the Castrol product is nothing more than a highly refined mineral oil.

 

[towforce]

Just trying to avoid the potential "Darwin" award for filling the transfer case with ATF. (Which is not a dumb as it sounds...)....

Cheers

Martin

 

[fordem]

Just trying to avoid the potential "Darwin" award for filling the transfer case with ATF. (Which is not a dumb as it sounds...)....

Cheers

Martin

It's not dumb at all - some transfer cases do take ATF - this is just not one of them.

 

[towforce]

Hey! How about an update on this "little project"? Are you going to pull the old core's apart (Trans and Transfer) to see what was up? ......

Cheers

Martin