760GLE Tranny Question

Hi all,

I have a Volvo 760GLE with what I believe is the AW-71 transmission
(the gearshift goes P R N D 2 L)

Anyway, the transmission fluid is brown and I got the car about 7
months ago, it has a little over 116k on the clock. I'm having no
slipping problems, I just don't want to cook the box with worn out
fluid in there. I am unsure of the last time a service was done (no
records from previous owner). I want to give the transmission some
caring for with a fluid change, but I don't want to hose my working
autobox. Any chance of this happening? If I do go along with a fluid
change, would it be better to do a gradual drain and fill or do a
flush through the transmission lines using the method on brickboard?

Appreciate the input
Thanks

 

In this kind a situation, a drain and fill, with new filter screen,
is definitely the way to go. Actually, you might want to do two or three
of them over a few hundred or few thousand miles, to get most of the
fluid replaced. You don't need to replace the filter screen after the
first time, unless it clogs. A flush might drive crud into places where
it will cause problems.

 

I figured it would probably be best to do the drain fill method, and I
know you mentioned a filter change wasn't required unless it clogs up.
I do worry about taking out the filter because I've heard the filler
tube nut can be a pain to get off, especially after 20 years! and I'm
not so sure I could get it off. So my plan is probably going to be:
buy a case of Dex 3 and run that 12 quarts through over the course of
a few months. Are there any additives that you guys like to put in to
keep shifting smooth and such?

Thank you,
I appreciate it!

 

There is indeed one, but my mind is blanking, and it's out in the
cold garage. I think it's made by Castrol, and called something like
'Trans Fix'. Anybody? Bueller?

Ok, a quick web search gives me *Lucas* Trans Fix. Try that. I've
never done the transmission fluid change myself, but are you sure about
that filler tube problem? If so, a good shop will do it for about $70.

 

The filler tube can be stuck pretty good, but if you have a big enough
open end wrench and don't try to use an adjustable wrench or vise grips,
it really isn't difficult.

 

Thanks for the tips guys

I really want to avoid disturbing the pan because it's not leaking and
I know it's kind of a big production sometimes... but if I do gradual
changes over the course of a few months, theoretically anything
stirred up should come out the next drain, right? Worst case, I'll
just drop the pan but I wanted to keep it simple.

Thanks all!

 

http://www.swedishbricks.net/700900FAQ/Transmission-Auto1.html#Fluid Flush

 

I've seen this on a few volvo sites, but is it still recommended with
the age and mileage of my car? Also, is this the type of flush that
you advised against Leftie, or did you mean a power flush?

Thank you

 

The other option is use the drain plug in the transmission pan to drain
the fluid this drains approximately 4 quarts of ATF if you do drain the
fluid this way make sure that you use a new sealing ring & a drain plug
Volvo part numbers
3549223
3549224
If they do not have these numbers have them use the old part numbers
1239960
1239961
Glenn K
Volvo Certified Technician
ASE Certified Technician

 

I didn't read the link, but I'm assuming that it's the method where
you run a drain hose from a trans cooler line and add new fluid. Sort of
an 'unpowered flush'. I don't think that would hurt, but if you want to
be safest, do a simple change first, then that about 500 miles later.

 

Sounds reasonable, I appreciate it guys!

Will give the drain a shot this weekend hopefully

Thank you