Upper Trans Pipe fitting

[gbsean]

as I am going to run an external cooler I removed the upper and lower lines...the upper adapter appeared to have been soldered closed and then had a small 1/16" hole drilled thru the solder...is this normal....and do I need to keep that fitting in when I install my new flex lines

[Lee Thompson]

The top fitting is the out to cooler. Precision Industries recommends restricting that fitting to .090 to help keep pressure in their multi disc convertors. If you have their lock up you might want to call them (I restrict mine to .110). Best of luck.

[gbsean]

Originally Posted by Lee Thompson

The top fitting is the out to cooler. Precision Industries recommends restricting that fitting to .090 to help keep pressure in their multi disc convertors. If you have their lock up you might want to call them (I restrict mine to .110). Best of luck.

yes I do have a 3000 multidisc converter...thanks...I will leave the fitting in and run the lines from there....

[DonWG]

I DO NOT install that fitting. I realize that it's there to make the T/C lockup firmer, but without the fitting it will still lockup plenty firm.

The dangers of leaving that fitting in are:

1) The possibility of creating too much back pressure in the torque converter which will ultimately cause more push on the crank thrust surface, possibly causing crank thrust overload and failure. A very nasty contemplation.

2) Small particles building up to block the small orifice, thus blocking cooler flow which will then cause no lube oil for the transmission, no cooling of the transmission fluid and the possibility of excessive buildup of back pressure in the torque converter, which brings us back to the first item.

I have removed this fitting from customer's cars with debris blocking the hole as described in item 2.

[wickedtt]

Originally Posted by DonWG

I DO NOT install that fitting. I realize that it's there to make the T/C lockup firmer, but without the fitting it will still lockup plenty firm.

The dangers of leaving that fitting in are:

1) The possibility of creating too much back pressure in the torque converter which will ultimately cause more push on the crank thrust surface, possibly causing crank thrust overload and failure. A very nasty contemplation.

2) Small particles building up to block the small orifice, thus blocking cooler flow which will then cause no lube oil for the transmission, no cooling of the transmission fluid and the possibility of excessive buildup of back pressure in the torque converter, which brings us back to the first item.

I have removed this fitting from customer's cars with debris blocking the hole as described in item 2.

Ok so No fitting but do you use the front pump mod they recommend?

[gbsean]

the trans and converter were done by a known V6 guy...have never had an issue withe the trans....thanks for the input Don....but if it aint broke....leave it alone.....but...i will contact precision on monday and see what they have to say....

[DonWG]

The pump mod is to more quickly evacuate the fluid from the front side of the torque converter so piston apply is a little quicker (firmer). The tube that is installed uses the pump inlet to create suction, rather than just let it dump into the main trans cavity unassisted as the T/C piston moves to apply. Although I have always installed the pump kit for people with the Precision and have done it to my own car, I don't feel it's absolutely necessary. Unless, you really need that T/C clutch to apply as firm as possible to ensure it doesn't burn during some nasty, mongo, monster HP pulls. The lockup with the Precision is very quick and harsh. If you do put the pump kit in, you may wish later that you hadn't if this is mainly a street application.

I have left the fitting out of numerous cars with no ill effects. I've even removed them for some customers who asked me to. In my opinion, there is much more chance of them doing harm than good. Believe me, you won't be able to tell the difference in the harshness of the apply of the TCC.

[DonWG]

If this is a race only car and you make it part of your procedures to check that fitting to make sure it is not being plugged, then go for it.