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Old 04-04-2007, 10:12 PM   #1
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Default 4l60e not shifting under load

We have a 4l60e in a lt1 that shifts great whenever the car is driving normal and under light acceleration. But when you give it full throttle it will sometimes bounce off the rev limiter and then shift, and other times it wont shift at all and you have to let off and it will finally shift. It mostly does this on the 1-2 shift but it occasionally does it on the 3-4 shift the tranny has been rebuilt around 30k ago and has also had new shift solenoids. We have had someone tell us it may be the throttle position sensor the car is throwing No codes and the tranny fluid isnt bright red but it looks normal for the mileage, PLEASE HELP WE HAVE NO IDEA ANY HELP WILL BE APPRECIATED we are just hoping we are not going to have to do another rebuild.
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Old 04-04-2007, 10:19 PM   #2
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Well you could try a TPS also is the speedometer working correctly .You also might try tuning down the shift times a little
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Old 04-04-2007, 10:21 PM   #3
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The speedo is working fine, and it seems like the problem has gotten worse as the more mods that have been put on the car, the problem started when the headers were added PERFORMABUILT i know yall are prettty reputable what do you think it might be?
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Old 04-04-2007, 10:38 PM   #4
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Well my first thought is a tuning issue , More power means the rpm increase faster, There is a delay between commanded shift and actual shift most notedly with the stock trans or a trans without a shift kit , If the shifts ae set close to the rev limiter to begin with and you add power this can be exagerated even more and cause you to hit the limiter before the shift can actually occur, Alternatly the trans could be on its last legs even though the fluild may look ok bands and clutches can become glazed and loose some of there gripping strength means the more power applied the less they can hold
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Old 04-04-2007, 10:47 PM   #5
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That makes a lot of sense i mean the car went from a 14.7@97 mph to almost full boltons minus under drives and a throttle body with the tranny acting up and letting off on the 1-2 shift to 13.94@100 and i think it could easily go 13.8 at 102 with the tranny prob fixed and the tranny is on stock settings and it appears it is supposed to shift at 6100? Thanks for all the help!
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Old 04-04-2007, 10:56 PM   #6
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Default 4l60E

anything at all done to the trans? I see more people that waste 500.00 on making the motor faster with exhaust,chips and air intakes and nothing at all on the trans.. Not all stock units are created equal some much more sloppy then others..
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Old 04-04-2007, 11:01 PM   #7
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Quote:
Originally Posted by Casey2323
anything at all done to the trans? I see more people that waste 500.00 on making the motor faster with exhaust,chips and air intakes and nothing at all on the trans.. Not all stock units are created equal some much more sloppy then others..

Guilty as Charged and its a 94 model 4l60e if that makes any difference.
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Old 04-04-2007, 11:43 PM   #8
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you should at minimum get a shift kit , But keep adding on and you will be in the market for a trans we have some good deals on 4l60e lt1 type units like your right now .I can give you 100 off the listed price of any LT1 unit presently we seem to have collected a stock pile since most of our customers are LS1
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Old 04-05-2007, 02:24 PM   #9
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OHHH I ALMOST FORGOT THE TRANNY KEEPS BLOWING OUT THE DIP STICK TUBE i mean it doesnt blow it out completely but when you pop the hood the dip stick is hanging out a little bit. Any explanations?
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Old 04-05-2007, 02:27 PM   #10
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Well the vent tube may be blocked . Has the car been setting still anywhere for any length of time I have seen dirt dobbers build nest in them
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Old 04-05-2007, 02:43 PM   #11
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Hmm it doesnt get driven too much but its usually in the garage wher eis the vent at?
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Old 04-05-2007, 02:43 PM   #12
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and it only seems to happen when the car gets driven hard
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Old 04-05-2007, 02:58 PM   #13
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Well the vent tube is on top of trans just behind bell on its back , But it also could be overheating alot to
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Old 04-05-2007, 03:51 PM   #14
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hmmmmm that is def something ill try to see if i can locate and look at. THANKS AGAIN PERFORMA BUILT yall do manual transmissions too correct? if so you have been very helpful and i would be glad to do business with yall if my m6 were to take a **** or if i build an auto car once again thanks for the help its nice to get help from the experts!
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Old 04-05-2007, 05:30 PM   #15
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Im having the same problem with my 99. I had the trans redone about 800 miles ago. Almost feels like sometimes its doesnt want to downshift or it doesnt have first?
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Old 04-07-2007, 10:51 AM   #16
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Ok well just1news6 is talking about my car. The problem shifts are from 1-2 and 2-3. The car can sit for 2-3 weeks at a time without being started. I did notice that the tranny was leaking but I couldn't find out where. Then I noticed it was loose where it connnected to the radiatior. A lot of the times I will check the fluid and it is not burnt but has a dark color. Also I have had solinoids go out before, and this is different. When the solinoids went out it would not shift at all to that gear, it would simply skip it and go from 1st to 3rd. So what should I do frist? Get a new throttle positioning sensor, have the shift points lowered, get a tune, or just put it in the shop? I want to also thank performabuilt for all the comments.
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Old 04-07-2007, 11:28 AM   #17
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Well as always easiest first , I would change the TPS or if you have one available borrow a freinds known good one ,
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Old 04-09-2007, 11:37 AM   #18
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Quote:
Originally Posted by performabuilt
Well as always easiest first , I would change the TPS or if you have one available borrow a freinds known good one ,
Great, I'll see what I can come up with. Thanks again, and I'll keep you posted.
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Old 05-16-2007, 03:43 PM   #19
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Well Guys my94ta just called and we do believe the 4l60e has finally died it will not go in drive or shift only goes in Reverse, Performabuilt he should have called you a few moments ago!
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Old 05-16-2007, 03:58 PM   #20
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Lots of people call what area code would he be calling from .
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Old 05-16-2007, 03:58 PM
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