Who's the 4L60E Guru on here??

[Formula Z]

Some questions about my car not wanting to shift at high RPMs. When I try and pass (flooring it) it wants to bounce off the rev limiter unless i let up a little. Also at the track if I put it to the floor, it shifts just fine, until Im almost at the end of the track when it should shift again, it hits the rev limiter, not all the time but enough for me to question whats going on. If I drive the car normally it shifts fine or even spirited driving it shifts fine. 1st and 2nd are perfect no matter how Idrive but 3rd and OD worry me. Any help would greatly be appreciated. I do plan on upgrading to a bigger stall this winter, probably a 3500, nothing bigger because it is a daily driver while its nice out. Thanks guys.

[PACE]

does it do it when you manualy shift it?
and how many miles do u have on it.

[1BADAIR]

if you have a stall convertor you need to reprogram your shift points

[Formula Z]

manually it will do it also, and i dont have a stall as of now, as far as I know. ive had the car since the beginning of summer. its just if i let off just a little it will shift. i guess when i pull the tranny to do the stall maybe ill have it looked at, unless i can get more info from here. thanks for the help.

[WMCC Dino]

sounds like you need to get the tranny rebuilt,pull your tranny pan and see how much metal is in it.

[98ultraz]

i had the same problem and had to buy a whole new trans.... like it wouldn't want to shift sumtimes into 4th when i raced and then also it seems like it slipped into 4th and i found out they have sum things that need to be replaced cause they aren't that strong and will deterate after 50000

[Formula Z]

well i did change the filter and fluid half way thru the summer and didnt really help. there also wasnt really anything out of the ordinary in the pan. can the torque converters go bad??

[CollinsAutomotive]

Some questions about my car not wanting to shift at high RPMs. When I try and pass (flooring it) it wants to bounce off the rev limiter unless i let up a little. Also at the track if I put it to the floor, it shifts just fine, until Im almost at the end of the track when it should shift again, it hits the rev limiter, not all the time but enough for me to question whats going on. If I drive the car normally it shifts fine or even spirited driving it shifts fine. 1st and 2nd are perfect no matter how Idrive but 3rd and OD worry me. Any help would greatly be appreciated. I do plan on upgrading to a bigger stall this winter, probably a 3500, nothing bigger because it is a daily driver while its nice out. Thanks guys.

Sounds like glazed clutches. trans proboaly needs to be overhualed.

[PACE]

I go with sean on this one!.. sounds bad..

[Formula Z]

damn it

[Formula Z]

well in that case, can anyone recommend a good tranny shop near the Grand Rapids area?

[V10Killer]

BS.
If you have a datalogger like HP Tuners or EFI Live, log your run when you hit the rev limiter. 10 to 1 odds you're hitting the last cell in you MAF tables when you're supposed to be shifting. It's the same thing mine's doing this year, and did last year when I was shifting 600 rpms higher. The car is supposed to switch to using the VE tables when the MAF fail frequency is hit, but it doesn't do it right away. I've spent almost 3k and had my tranny out and inspected twice before I discovered that it only happens when I hit the last cell in my MAF table. Seeing as how you have a '98 F-body, I'm betting you're hitting the same thing too. Do you have the factory MAF, or did you upgrade to a 85mm? I've been told the 85mm will actually make things worse.

[pHEnomIC]

Is it possible my t/a is doing the same thing(m6)? When i shift near redline, it feels like the rpms fluctuate through the shift. I have the SLP 85mm maf. I would think it is my clutch but it works great doing anything else and if i short shift it before the redline, problem solved. It doesnt slip at all doing anything else.

[Formula Z]

I still have the stock maf. 98% of the time the tranny shifts fine, but its that 2% that makes me worry. I need to find someone with one of those tuners.

[CollinsAutomotive]

BS.
If you have a datalogger like HP Tuners or EFI Live, log your run when you hit the rev limiter. 10 to 1 odds you're hitting the last cell in you MAF tables when you're supposed to be shifting. It's the same thing mine's doing this year, and did last year when I was shifting 600 rpms higher. The car is supposed to switch to using the VE tables when the MAF fail frequency is hit, but it doesn't do it right away. I've spent almost 3k and had my tranny out and inspected twice before I discovered that it only happens when I hit the last cell in my MAF table. Seeing as how you have a '98 F-body, I'm betting you're hitting the same thing too. Do you have the factory MAF, or did you upgrade to a 85mm? I've been told the 85mm will actually make things worse.

Ok here what is going on with that. Its not the MAF maxing out as much as it is a TQ step lookup issue. You could go into the tune and increase the FT LB requirement for a TQ step look up ( in the transmission Constants) and bumping that value should easily fix the bump at the top of the table. Although i would be more inclined to belive its a line pressure issue. We've got an A4 427 car that is always maxing the MAF no shifting trouble as of yet. the only other culprit might be the expected air vs TPs table. but again it shouldn;t cuase this issue.

A stock A4 car with a factory motor only pulls around 280grs/sec well below even the 85mm maf max.

Sean