Change the Speed Sensor and I hope it works for you like it did for me twice

 

The shift points are set by mph and rpm. If you reach one and not the other you will hit the limiter. Depending on the converters effiency you might not be at the same mph you used to be and if you dont meet both the mph and the rpm it wont shift. I just switched converters and nowi have to get my shift mph readjusting.
It could defintly be the speed sensor . thats cheap to try

 

Did it fix it?

 

I have been through this... I even decided to replace the entire transmission to try a fix. Only happens from a WOT (from dead stop or near dead stop) The brand new tranny did the same thing. Laugh if you want, but Jay Fischer (Pontiac) as some of you might know, swears he has our solution and has taken care of it numerous times with one simple mod. Hell , I even took my car back to Cartk to have this fixed w/ the tune, and that didnt work... So what was the mod... A Tahoe Transmission pan. The f-body (4l60e) tranny pick up is in the front of the pan...the Tahoe pan is slanted forward so at WOT inertia doesnt keep the fluid in the back of the pan. This is why the bounce often occurs..., by 3rd the pick up is sucking air...or simply noy enough fluid...we bounce long enough for fluid flow forward and to be picked back up ...or for momentium to stall and fluid to settle (same thing happens when you let off). The pan and necessary filter will run about $100-125 discounted if I recall. You can also order the pan w/ a factory drain plug if you pick the right model year (was it 2000??). If you have issues bouncing other than wot from a stop, then it is probably the commonly weak 3-4 clutches. I hope this is informative for some of you and can be an easy fix. BTW, Jay may or may not want me sharing this info, but I cant see some of you wasting money replacing a tranny like I did when this "could" be you answer too.
And I know what your thinking...cant I just add and extra quart of fluid...I cant comment on any ill effects, but Jay once suggested I try adding at least a qt before I change the pan to see if it was any better...but only during my time at the track..not to leave it in there....wish I had had that drain plug then!
Lt me kow if any of you 1)beleive 20 try and are sucessful.

 

Went back to the track and left it in over drive but same thing happen but found out I had taken the program out put it back in and started shifting better only hit limiter about 4 times before shifting or lifting off pedal dont know which helped more but going to put in speed sensor and head back to the track if weather holds out ...never get a chance to go on T&T night because of work but soon ...so going on race day and only getting 3 runs sucks and have to wait between rounds .Going to try some different setting on the predator going to do some - %'s on shift time

will even try the pan thats not a bad idea thats want I did when i had my Lightning after puting a valve body in it for the extra fluid.

 

I saw a post where Valvegod had the deep pans for 60 bucks !

 

True, but you need the filter update at the same time...not an option, a must, its different i beleive.

 

why does everyone need it in D to drag race....I've always gone into 4th w/my 4L60....car had 100-150 shot TNT kit from about 40K to 85K, with a 4000 3disc vig, then @ 85K I put (See sig).....tranny still lasted till 112,000K before it started not making the 2-3shift....

 

Finally made it to a T&T night last night and trans was still messing up even if I put shift press and shift time at -25 % or + 15 % still would not shift into 3rd gear . So now I"m going to replace the speed sensor and install a deeper tranny pan and go back next friday night .Just seems F**ked up that this problem happens with the stock converter in it as well and have had this problem with every tranny thats been in the car . even had the 3/4 clutch pack replaced once.Now I have the 4l65e tranny and same problem.

 

i had the same problem with no tuning and 89000 miles and stock everything other than spray and free mods and hit the rev limiter once on its own in d and i was like what the fuc? and then it got worse and worse till i lost 3rd and 4th and there on the same drum/clutch pack and i pulled trans and found the 3-4 cltches gone. didnt listen to anyone when they told me that it was it when it was in the car doing it i figures it had to be the pcm or something but sure enough it was the clutchs and what i can say from doing alot of research it happens alot, i am in the middle of putting a new built 4l60e in it with small vert with edit and things, but sounds to me like the 3-4 is smoked best to take it out now and get it fixed or something before it goes to long and trashes your sel packs or somthing thanks

 

11SECSS, did you get it figured out? I'm curious because mine does the same thing. All was fine till I changed to the Trex cam from the TR230. I've messed around with the shift MPH and RPM using Edit and it simply doesn't shift unless I let off the throttle a bit. I have a built tranny and I doubt the cluthes just all of a sudden went when I did a cam swap. I know other people with the Trex are having the same issues, just didn't want to let this die..

Dan

 

I have the same problem in my car and can't figure it out...

 

My car is stock and going back top the dealer let them find the problem..will let you guys know when they fix it or not

 

Ok, after my h/c swap and a built tranny, I was having the same problem. On motor it would shift fine into 3 but on the dope, it would just bounce off the limiter. Try and drop the 2/3 shift mph down as far as it will go and work your way up if it is shifting correctly. If this does not fix the problem, you are gonna have to open up ur tranny and do some replacement. I destroyed a stage 3 tranny the first time, had it rebuilt with some 'extra' goodies and it shifts fine now, no hestitation running in OVERDRIVE. Ive got a hypertech and a stock tuned pcm and have it down. Took sometime, but we worked the bugs out. Also on the HPP3, we didnt tell it it has a shift kit to help it shift and it makes a BIG difference, the upped line pressure insures the clutches engage and stay engaged. Just my experenice with these little PITAs, maybe it will help you out. JP

BTW. This is a tranny from Owen at ARD in Houston.

 

my car does that if i race with it in 3. in D, no problems at all... confused, but now i just leave it in d.

 

I see a lot of people fix this problem with putting it in OD, but it doesn't matter for my car, does it either way. I've been running it in "D" for ever now and have yet to see an issue till now. May be part of the problem is it rev's faster now and the SS4000 is flashing up higher letting it bounce off my 7200 rev limit with 6900 shift points. I'll try dropping the MPH down to stock and see what happens. The Tranny feels solid, it just keeps going to the limiter, I can't juice till this is totally resolved. I see a ton of people with this issue doing a search, but there is no definitive answer, just a lot good possibilities..

Dan

 

so how much does it cost to fix the 3-4 clutches?

but the general order of troubleshooting this should be:
speed sensor
deep pan + filter
3-4 clutches

right?

 

I replaced my 3-4 clutch pack myself. The clutch pack was $77 shipped

 

Actually I think this might make sense. I've heard of people overfilling an extra quart or two and fixing the problem. But I'm not sure how much fluid is actually in the pan right before the 2-3 shift. Isn't there enough fluid in there anyways? Well, I've installed my deep pan. I'll run it on Tuesday and post up if it fixes the prob.

 

I would say Do Not Over Fill Your Transmission. All you will get is alot of foam and it will hurt your transmission. I would buy the deeper pan if you are worried about a fluid shortage.