Stock stall speed?

InvisiBill

InvisiBill

Active member
I've heard several times that the stock converter stalls at 2100 or 2075 or something like that. When we pulled mine out, it still had the GM sticker on it, showing it as a 1654. I'm the third owner, so I don't know for sure what was done. It was very stock when I bought it at 77k - original plug wires, metal IC lines, paper air filter. He felt it was fast enough as is, so he didn't do anything to it. Tooky's check also didn't show anything major on it.

Once he got it apart, the tranny guy said that it wasn't all original. It had new seals and/or gaskets or something. But it looked like it had all the stock parts and still needed to have the updates done on it, so I'm not sure what was done. I've heard of "refreshing" a tranny, where you basically go through and redo gaskets and stuff, but don't replace parts (i.e. same labor, save a few bucks on parts).

Now that I've got it rebuilt and back in the truck with a 2075 for sure, it was definitely a lower stall before. Wondering if anyone knows for sure about this, or had a similar experience...
 
InvisiBill

InvisiBill

Active member
I had him check the VIN in the GM service records, just like almost everyone else here had him do for their trucks. It came back clean...

It's just a regular 2075 converter that came with the rebuild... $700.
 
B

Blake

Guest
Hey Bill,
Did the old one have "7" stamped around the circumpherence of it?
My original and the replacement for my 9/11 had 7s around the circumpherence. The freshening may have been done by a shop that didn't know anything about our trucks.

I snagged this off of transonline:

Type 2
I.D. Code - B / All 5.7L HO Engines
Stall Speed - 2075 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch
Type 3
I.D. Code - E / 4.3L & 5.0L V8
Stall Speed - 1639 RPM
Mounting type - 3 pads
Description - 12'' diameter, 30 splines, 1.703'' pilot with converter clutch.

If you look at type 3 you'll see why they probably stuck that in there.
Guy calls his converter place, they ask him what engine is in it, he answers "4.3", they sent him a TC.
Blake
 
InvisiBill

InvisiBill

Active member
I don't know about the 7, but it had a DECF sticker on it, E being the important one and indicating a "Type 3"...

It's weird getting used to this higher stall for daily driving... "Just go already!"

We'll have to see how it holds up, but Twins (next to nothing for SyTy experience, but lots with Turbo Buicks) thought it was really nice. Shifted crisply, softer at lower RPMs and harder at higher, and seemed to handle launching pretty well. If the weather cooperates, I'll have some new track times tomorrow for a real comparison...
 
L

Lynn D. Brown

New member
Stock TC Stall

Stock TC Stall

Don't know where so many people come up w such high stalls for the stock TC's. No way is it 2100 RPM, or even 2000 RPM. Most stock convertors are around 1600-1900 RPM. Maybe it depends on how U define or measure it. My understanding is that U power brake the car until it "catches" and starts to move. Based on this, my stock convertor stalled at 1650-1750 RPM.
 
B

Blake

Guest
It's printed on the converter from GM if you still have the original sticker on it with the bar code and stuff. GM is the only one that can actually measure stall according to Rusty at TCS. That was one of the things that made the SyTys special also. I've seen converters from syty's that said anywhere from 2036 all the way up to 2075. The stall of the converter you are describing is from a normally aspirated 4.3 v6. Wrong converter for a syty.
For example, Bill had a ~1600 stall in his. However, it had been worked on before and the gentleman that did Bill's trans informed Bill that the transmission had been worked on before as evident by different types of gaskets than GM trannies come stock with. Of course when it was worked on previously(Before Bill had it fixed)the shop put a converter in it for a NA 4.3. It sucks, but it happens.
That's why we try to inform each other on here as often as we can so we can prevent stuff like this from happening to others. Look how many people on here lost their original trannies to GM during warranty work only to have them replaced with trannies with the wrong valve body,converter,1-2 servo and planetaries.
The shop that went through mine after my 9/11 dumped its inners all through my tranny knew exactly what a Ty was and ordered a 2075 converter for it. My original converter had 2056 on it or something like that.
It was original GM SyTy converter via the bar code on it.
Of course torque multiplies as HP goes up so a 2075 rpm converter will stall a bit higher in a 400 hp setup than it will in a 275 hp setup.
HTH,
Blake
 
B

Blake

Guest
Forgot to add, there are different ways of course. Flash stall is when you are sitting dead still without your foot on the brake. Floor it and look at the rpm it is at when you start moving.
The stall that GM uses is the stall defined by locking in the brakes and revving the engine up until the engine stalls out. "stalls" as in "stall speed". See? Not a healthy thing to do to an engine/tranny. Most places I've talked to do not truely believe it can be measured this way as the tires will break loose before stalling the engine out. I've read where some crazy people on here are taking off from the line with 15psi, these people have got to be approaching stall, unless one of the tires are breaking loose. This is what usually happened with my Sy, the right rear tire would break loose. The others would hold me stationary but the driveshaft was turning so true stall couldn't be obtained on mine.
Maybe this helped, maybe it didn't.
Blake
 
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