torque converter questions

[kprofthestrs]

what is the stock stall speed on a 4t60e 96 trans. i thought it was 800 stall?

what and were is a good place and brand of replacement converter.
should i stay stock stall or go higher if available?

torque converter shuddering. will need replaced.
need to find new one asap.

[Manitcor]

more like 1800 stall. Stall ratings are kind of funny though, if your converter is rated 1800 stall it can stall anywhere from 1800-2500 depnding on how its setup and your PCM tunng.

IMHO, stick with your stock stall unless your doing something that really requires you to launch higher than 2000rpm (large turbo setup).

Talk to Dynotech performance, they have HD converters for that trans for about $500

[kprofthestrs]

uas- matic here in mobile has one for this application. i also asked them about a flywheel they couldn't get me a weight on the one they had but what they could tell me was it's

142 tooth
11.87 od
sounds like a stock replacement to me but i'm not sure. not sure what the stock weight is for the orignal.

[sharkey]

before you go replacing the converter, what exactly is the car doing??? when is it doing it???

we see cars with the 4t60e lots at work with a shudder going uphill at light throttle at about 70km/h. this is actualy an engine miss, not a converter problem. what usualy happens is when you come up to a hill you roll on the throttle a bit, but not enough for it to come out of lockup. there is a lot of load on the engine, and a miss shows up very well under these conditions, however, most think its the converter as it only happens in lockup.

when is the last time you did a tune up (plugs, wires, ect)???

[kprofthestrs]

tune up was done three months ago. its"doing it more at 45 with the tcc engaged. drove around yesterday with a transmission specalist that works with me. we had tech2 hooked up and no engine miss detected. watching the transmission performance he assures me that it the tc. as it is the original with over 134,000 miles on it. i am not surprised i believe this has been happening for a long time. i could feel what felt like a miss at 50+ going up hill in cruise. so i tuned it. until the last few weeks it only locked up at 50-52mph now its started locking up at 43-45 mph.

[torq455]

if it's a missfire, the check engine will start flashing in no time. as long as it's an OBDII.

[sharkey]

if it's a missfire, the check engine will start flashing in no time. as long as it's an OBDII.

not true. my co-workers sunfire had to get to 8000 misfire counts till the cel came on and it set the code

i see vehicles all the time with "lockup shudder" that is actualy an engine miss, and the CEL is never on. in order for a code to set, a specific cylender needs to missfire a certain percent of the time, and most of the time, unless its a very bad miss, it doesnt set the code

[torq455]

is true! happend to me on my 97 lumina. what year what the sunfire? if it's OBD II then it should trigger a code.

another note: what IS the stall speed on a 4T60 tranny? same, higher, or lower than a 125C?

[sharkey]

it all depends on the motor. there are a lot of different stall speeds. the 125c and 4t60e, along with the 4t40e/4t45e use the same converters.

[HayesPerformance]

What is the stock stall speed of a 4T60-E with the DOHC????????

I have been trying to find out.

With this motor you can benifit from a higher stall then stock cause of the HP occuring at higher RPM starting in the lower mid range.

[sharkey]

couldnt tell you the stock stall speed, id need a stock converter code for that.

i can say that yes, a dohc would benifit from a higher stall depending on what you have done to it. if you have red degrede the cams, then a higher stall will deffinitly help. if your turboing, a higher stall isnt nessesaraly a better thing. its better to have it stall lower as it loads the motor more and creates boost lower.

[timg]

IIRC, the stock DOHC is somewhere between 2000-2200 rpm. I'm running a Quad 4 torque converter that's around 2900 rpm.

Tim

[HayesPerformance]

What was the biggest differences that you noticed with the High stall torque?

Is there any difference in MPG, Does it have way more lift off the line? Any set backs?

[timg]

No real MPG difference. It still locks up like stock. A bit higher RPM off the line for a bit more oomph. Once the turbo spools, it tends to hold 5000 rpm while the car accelerates rather than RPM increasing with MPH.

Tim