Synthetic ATF

[robert b. mccarthy]

>From the comments that I have read on the Net there seems to be a general
recommendation for switching to Synthetic ATF. I have talked to two local
transmission shops about doing this. Both felt that there was no real
justification for switching, however, I disagree.

One wanted to drill and tap a drain connection in the converter as the only
way to get out all of the old fluid. The other shop was not equipped to do
this. Is there any risk of getting metal filings in the converter?

At the cost of flushing with excess synthetic fluid it would be cheaper to
put in a drain connection. Any comments?

Bob McCarthy
mccarthy

 

[hdavis]

>One wanted to drill and tap a drain connection in the converter as the only
>way to get out all of the old fluid. The other shop was not equipped to do
>this. Is there any risk of getting metal filings in the converter?
>
>At the cost of flushing with excess synthetic fluid it would be cheaper to
>put in a drain connection. Any comments?


Bob,

you may be able to let your coach sit for a few days to a week or more to
let the fluid drain out of the converter. (The leak down is a common
problem on the GMC). Drain the fluid cold (starting the engine will pump
fluid back into the converter) and you should be able to get most of it out.

Henry


Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (831) 462-5199 / full service marketing
fax: (831) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com

 

[john wright]

The Mobil 1 ATF is compatible with the regular ATF. If won't hurt if
you don't get all of the Dino ATF out. I am about 60/40 percent
Synthetic/dino and my next change will make it even more. It is cost
effective to change more often than the cost of a tranny.

The Mobil 1 ATF will run cooler and has a higher coefficient of friction
which means it will slip less in your trans meaning lower tranny temps.

J.R. Wright
GMC GreatLaker
77 Eleganza II
Michigan

>
> >From the comments that I have read on the Net there seems to be a general
> recommendation for switching to Synthetic ATF. I have talked to two local
> transmission shops about doing this. Both felt that there was no real
> justification for switching, however, I disagree.
>
> One wanted to drill and tap a drain connection in the converter as the only
> way to get out all of the old fluid. The other shop was not equipped to do
> this. Is there any risk of getting metal filings in the converter?
>
> At the cost of flushing with excess synthetic fluid it would be cheaper to
> put in a drain connection. Any comments?
>
> Bob McCarthy
> mccarthy

 

[kara m kosier]

>
> you may be able to let your coach sit for a few days to a week or more to
> let the fluid drain out of the converter. (The leak down is a common
> problem on the GMC). Drain the fluid cold (starting the engine will pump
> fluid back into the converter) and you should be able to get most of it
out.
>
> Henry
>
>
>
If you drain the converter thru the usual leaky converter check valve, you
can only drain the top half of the converter. If you put a drain plug in
the
converter, you must also put a second one in 180 degrees around on the
opposite side. This takes care of the balance problem. You must also
avoid drilling into the internal vanes. My Camaro shop manual gave
instructions
on where to drill on the 700R4 Converter. I don't know about the GMC
converter. Also, several years ago, someone wrote into the Motorhome
Marketplace about applying low-pressure air to the test port at the
left rear corner of the tranny and blowing most of the fluid into the pan.
That's all I know. Gary Kosier