98LS1auto

iTrader: (3)

My car previously had a Yank 4000 SS in it. That's when it run the best times in my sig. Well my trans blew so i sent it back to Yank. On my shifts it was dropping around 1300 rpm. So talked to Dave at Yank and he said going to a PT 4400 should really help and definitely help keep my rpms higher on shift. Well got it in and it acts exactly like the 4000 SS drops around 1300 on shifts. Needless to say I was disappointed. I thought about calling him back and raising hell but the car was down long enough. I'm just not going to pull that converter again and send it back when I don't really know it would be any different.

I'm just surprised/ disappointed its still dropping the same as the SS. Makes me wonder if he even did anything different to it. It sure acts just like the SS. Any thoughts from you guys?

vorteciroc

You are Not making enough Low-Speed/ RPM Torque to take advantage of the Torque-Converter.

98CayenneT/A

No need to raise hell imo.... it's not a exact science..... lots of variables....... weight, power, shift points, gears ect.

I run the PT 4400 and love it.

Shadow02SS

My wifes car actually picked up going to the PT4000 in her cam only car, picked up 1-2mph while not losing anything at the sixty foot still 1.41-1.43 at the front half. Her cars goes 10.80's at 122-123 with 417hp at 3300lbs

67LSX454

Timely thread as I'm presently shopping for a converter.
How would the SS compare to the PT? Is it at the hit? More stall with less torque needed or vice versa?
The reason I ask came about in a discussion with Circle D. At first I was just another street hero wanting a stall converter. When I stressed the drag racing aspect (and leaving street off the table) the spec changed to their Pro Series. I think though that had to do with diameter/stall requested. Their HP line is an 11" vs the 9.75" spec'd for me.
A quote from Brian at Circle D.
This converter is our smallest/most aggressive 9.75" diameter. We have found it compliments the power delivery of the naturally aspirated engines quite nicely. Since you're looking to maximize your track performance, I don't see any problem with a stall speed around 4000 rpm.

Would it be fair to say that the differences might similar to the ST vs the PT?
I also spoke with Dave at Yank and he recommended their SS4000. That too was a conversation that didn't emphasis the racing part.

98CayenneT/A

67LSX454

Regarding shift extension, from post #1 it would appear that the promise is less RPM drop when going with the PT as opposed to this SS. The OP didn't experience that however it looks to be then that that's the difference between PT and SS.

The difference in shift RPM's notwithstanding, do you drive on the street as well? Where there any discernable differences between the two types?
I'm exactly in that spot where you are/were. SS4000 as suggested by Meyers or a PT4000 if there's a benefit and no downside.

67LSX454

That brings to mind the improvement we saw when going from an off the shelf TCI 10" to a Yank SS3600. Previous shift RPMs through the 4L60 were 6500 down to less than 4k. Maybe closer to 3700-3800. The Yank tightened that up to never getting less than 5000. It was a lot of years ago but IIRC, the 60' was about 2/10 tenths quicker and a half second quicker overall. I do recall how long the recovery was between 1st and 2nd with the earlier TC. It felt like forever.
This is the move I was contemplating again as that TCI converter is still in play. Or was anyway as it'll need to be cut open and gone through and it's not worth it.
This SS vs PT conversation has me re-thinking the plan. Still more converter companies yet to be heard from (I've got a half dozen leads out there).

jakeshoe

iTrader: (14)

EVERY Yank converter we've ever cut apart was the same pump stator combo. Whether it was advertised as a 3600/4000 etc.

67LSX454

Where then would you see a difference? Is this similarity with the pump and stator carried across to different product lines? That is, SS vs PT (both are available in a 4000 stall)?

98LS1auto

iTrader: (3)

Mine with half a tank weighs 3400 and change. With me in it closer to 3700 or a little over. I have a 9 inch rear though. Mine made 436hp but added a Chris 1313. So I think its probably closer to 450 now.

98LS1auto

iTrader: (3)

Wish mine acted like that.

98LS1auto

iTrader: (3)

Oh yes drive it 3 hrs round trip to track. Still AC and cruise. I could not tell a single difference driving on the street from the SS. Nothing worse, nothing better.

madmike9396

iTrader: (29)

how my PT4000 shifted

67LSX454

Looks to be about a 500 RPM window?
That would suit my assortment of parts very well.
Now, when getting around town on the occasion that you might, are you always "up against the converter"?

Kfxguy

iTrader: (1)

Comparing a tci (junk) convertor to a yank is like comparing a kia to a lambo. I would not run a tci convertor if you gave it to me. Having a tci convertor and going to ANY yank is guaranteed to go faster. I speak from alot of personal experience with both.

Kfxguy

iTrader: (1)

how did you measure the fin angles?

madmike9396

iTrader: (29)

It wasn't too bad around town, 2k-3k range