well as some may know i have been fighting tranny issues for over 4 months now. i have spent over $650 in tuning alone and its come to a point where im about to give up. the drivetrain is all out of an 00 camaro.

here is the verdict....

the car was running 10.80s on a 100 shot for the first 2 shakedown passes....than BAM the rear end goes. i figure while the rear is out ill get a built tranny. well the rear goes in and the only problem is my MPH is off about 6%? going from 3.55s to 3.31s.

anyways, the tranny goes in and now the tranny never wants to shift. the GM tech II scanner shows the car going the 20MPH when im going almost 70. as you know LS1s shifts are based on MPH at % throttle....(this is all on the same tuning. nothing should have changed!)

so now i have replaced the speed sensor and relucant wheel. SAME mph reading and tranny doesnt want to shift out of 1st unless you get up to about 6000 and then let off it will upshift.

so........can anyone give me direction on what to try next? we have found a way around this in the tune but i want things RIGHT. please give me a hand on what to try or if there is something possibly wrong with the tranny!


thanks, adam

 

Seems to me like I remember that a shift is relative to MPH AND a RPM criteria met. I don't know if it's true, or if you looked into this on your path of tuning, but just an idea.

 

i can tell you right now it isnt in the tune. i have had the best on my side look into it and i have run out of ideas. how is my tune spot on with my old tranny but the second i put this tranny in the tune goes wack?

 

Here was my only reason for mentioning it. That's the only thing that "really" changed right? I would think that while you were going through each gear you'd first hit the RPM/MPH criteria, then the remaining criteria. If you changed gears you would reach the RPM criteria quicker, but the speed would not be met yet.

P.S. I'm not a tuner, so I could be wrong. I just remember changing a few things back when I had LS1Edit v 1.21 (old) and there being a table that controled rpm vs. tps like you talked about for shift, but also (digging deep in the memories) a RPM vs Speed -->REV LIMITER<-- table that you might check out as just an idea. Again, just an idea and I am not a tuner whatsoever.

P.P.S. Good luck, I know how frustrating these things can be.

 

I know this is going to be an already checked that, checked that too type thread.
Is the tps working right? did you change the stall speed?
What trans did you have and what did you replace it with? I know '00 camaro but whats the new trans?
Why did you replace the reluctor wheel, visual check should be good was it damaged? Does the new one fit tight?

 

both trans were out of an 00 camaro....kept the same 3400 stall. as for the reluctor wheels and sensor i just used the old stuff from a tranny i knew worked in my car.

what are ways in testing my tps sensor? i would assume its all working fine as nothing has been touched except the tranny. the old sensor and reluctor wheel looked fine so maybe it could be something with the tps.

 

 

The GM tech II you mentioned earlier can't test that?

What I do is hook up HPTuners with the engine off, scanner/key on press the gas pedal down.

The speed sensor is connected to the output shaft, thats connected to the driveshaft. If nothing was changed except the trans and rear thats a short piece of the car to look for problems in. From the reluctor wheel back to the axles. This is if you insist that nothing else is wrong because nothing else has been messed with. Obviously something is wrong if the speedo is reading wrong, so you either have a different gear ratio than you think or the speed sensor is messed up, wrong tooth count on the reluctor wheel, I don't know.

You say you found a way around it by tuning, what did you do?

 

im starting to have a feeling this relector wheel is out of an M6 car. the way you can tune around this......set your shift points to the new mph that is equilivant to the mph table when the speedo was right.

since im running an autometer speed i can recalibrate the cluster to read the correct mph which only leads in having a funky tune.

this is what i have found the 4l60e relector wheel is supposed to look like......

 

can anyone confirm this?

 

The pic you have is of a 4l60e but its hard to say on the pic through the tail hole what is in there if they were side by side maybe

 

I am pretty sure that the reluctor tooth count is 40 on all 4L60E transmissions . The one in the picture through the hole in the housing does not appear to have that many teeth . With a lower tooth count the output shaft has to turn more revs to give you the same speed reading .

 

Here is a picture of one I have here on the Dyno. I think yours is wrong. I have never seen one like the one you have in the picture above. John is correct that it should have 40 tooth rotor. In my book there is only one listing and that is all I have ever installed. Picture below is what you should have.



Also it looks like the threads are damaged in your pic. You might want to fix those as well.

 

thank you vince!!!! ordered the new reluctor wheel today...only $7.92 from chevy.

hopefully it wont be to bad of an install. from reading into it, it looks like the gear will have to be pressed on.

 

No problem I happened to be downloading some pictures/video's that I had taken today. I saw your post while waiting on the downloads and figured it was just one picture! Really I was just confirming what John said with a picture so you could see it for yourself. I would always use a press to remove one and install the other. I have seen pullers used to remove it and then seen it beat on using a pipe. That scares the hell out of me because of the bearings inside the trans. The shaft will have to be removed from the trans in order to use a press. Vince

 

I was playing around with the camera too so why not. I thought of this thread when I took the pic.

 

does anyone know the t56 reluctor wheel tooth count?

 

It's 17 for the T56.

 

once again thanks. great tech on this forum!