Save some cash and do it at home. Drop the pan and change the filter, then pull your trans cooling line and get another line to insert in its place, let it drain into a bucket while someone else is adding some.

I would NOT get a flush if it were mine. I would simply change the filter and replace as much fluid as possible using Dexron III.

Once again, a local GTP driver had his tranny flushed and it died a week later :?

I've seen many die from having a flush and zero from NOT having a flush...pick your odds

Cheers,

Okay, here'* the full skinny. Flushing.. if your tranny dies soon after, then you had a problem to begin with.. it can also clear out any dirt that may be in the valvebody. There have been cars saved by flushing.. our own Bill extended the life of his transmission by flushing it.

Foghorn.. I don't mean to be an ******* here, but there have been plenty of cars that died from not having a flush. Drain and fill is good if your fluid was cherry red.. and your transmission is new[er] and in good working order. If your fluid is dark/burnt a flush is almost a must, because of the fact you need to get ALL that old fluid out of there, otherwise it will contaminate the new fluid, and you will give your transmission premature failure. If 6months ago you just did a full flush, then now a drain and fill will be fine [of course, if your fluid is of good quality, and your transmission seems to be in working order].

Now, of course this is a hot topic here.. but there are two posts in the 87-91 forum [a few months back] that have ALL the information laid out for you. There are a few pages, so be prepared for a little read. Just get informed before you do either. I still stand by flushing.


-justin

I too have heard of trannys going bad after a full flush. It'* commonly on cars that are making a lot more power than stock too. I am iffy about getting one myself.

You're right, it is a hot topic. No doubt it'* hard to prove one way or the other if it'* helpful or harmfull. I said I wouldn't do it, but that'* just my opinion, others feel differently.

Cheers,

trust me, you don't have dirt in your valve body
and not to be a jerk either, but i don't suppose you could tell me how old tranny fluid would contaminate new tranny fluid? do you know why transmission fluid is red?

i suppose at most, mixing old and new fluid might reduce the functionality of the fluid, but not by much. and tranny fluid is red... so you can see it. the color test means *nothing*. it'* the smell that you need to be careful of...

now personally, I'm for the full flush. the one with the car running, and the machine hooked up to your fluid cooler lines. I honestly don't see how that is any more harmful to any transmission out there than what it is when it'* running normally.

My fluid [before I lost it all] was brown.. like dog **** brown.. clutch material I believe it all was. Well, if I have 50% of that, with 50% of new fluid.. guess what? The new fluid is going to be filled with clutch material just like the old fluid was. Yes, it will be dilluted, but it'* still there. I don't know why you would want that crap in your fluid.. but hey, to each their own.

My FSM'* symptom -> fix charts list a lot of "Dirt in x passage." And, a lot of them are in the Valvebody.

Here are the three [sorry, forgot about one of them] posts about tranny probs..

http://www.bonnevilleclub.com/forum/...ic.php?t=27488
http://www.bonnevilleclub.com/forum/...ic.php?t=27650
http://www.bonnevilleclub.com/forum/...ic.php?t=27790

Mods.. I don't know about you, but this tranny flush stuff seems to be a little too common. Sticky? TechInfo? Something to put all the info out there?


-justin

if you've got clutch material in your tranny fluid, I don't really think there'* much question as to what you need to do with it.

and as i said, i still think that the flush is by far the best choice for all vehicles... and a much better choice than dropping the pan. that is, however, my opinion.

and as for dirt in the VB, if you FSM says so, then I guess it'* happened to someone. but having seen transmissions returned from the field because of a fiber - that was barely naked to the eye - from a glove of a guy on the line found it'* way to the valve body, i say that if you had dirt in there, you would have some serious transmission problems.

but to state my position that i said in another thread... basically....

when you do a flush, hooked up to the machine, it'* like normal operation for the transmission... nothing out of the ordinary, just the stuff coming back in is clean, and has better bonding characteristics. when you drop the pan, any sludge that may have built up (my opinion: not much, if any, but again, an opinion) has a chance to drop down, move around, and get into places that it normally wouldn't get in to. to me, that sounds a lot more harmful than running the transmission like normal, except replacing fluid as it'* sent to the cooler.

but again, it'* all opinion. take it for what it'* worth. and opensourceguy, sorry if my last came off as rude, just pokin a little bit

No disrespect to a Gearhead (I respect them more than anyone), but there'* a big difference between a 4T60 and a 4T65. I have yet to hear a horror story of a trans flush on a 4T60. But I've heard plenty on 4T65E'*. Does anyone PERSONALLY know anyone that had this horror actually happen, and if so, which series of trans? Any story you hear from the GP community will likely be a 65.

I've had nothing but good luck with them. I've paid for them, and done them myself, with no problems. ALWAYS good results.

I'm very confident in telling someone to do it with a 4T60, but that doesn't mean there'* no chance for failure. Just low odds?

Foghorn, will you give me that much?

I just had my tranny flushed in November. 3 months later with NO problems.
I won't tell you either way. A good rule is if it hasnt been changed, dont flush it. But if you keep some semblance of a fluid change routine you will probably be fine with a flush.