How much will the tranny slip in 5th gear, locked TC, before the tranny goes into limp mode? And as far as that goes, I thought the Edge was supposed to back down the power to keep the tranny from slipping?

I was running on 5/5 the other night. 5th gear locked and seeing 12-13% slip. The edge never backed down, no SES light/code and no limp.

IIRC the edge turns down at 3% slip and the engine turns down (limp mode) at 5%. When I limped my stock tranny It was on a downshift from 5th to 4th and all I got was a clunk and high RPM's. Stuck in 4th gear. I never saw the slip because I think there was any before (at least not long enough for me to look at the attitude) the TC let go. The edge will only back down the power it has added AFTER it senses slip. The ECM needs to do the rest if it senses slip. They cannot determine ahead of time if the tranny will slip or not just try to protect it as fast as possible after slip occurs.

On another note do you know where 7th street repair ( I think that's the name)is? My uncle works there.

I watch that attitude like a hawk, whenever it gets above 1.x% I'm backing off. The other day I was racing a Harley Fat Boy and got looking down at it and was seeing 12-13% slip!!! I have the edge programmed to back down (I thought) and I've read the 3 or 5% slip limp mode. Neither occured???

I know I need to upgrade the tranny (you're beating a dead horse there) but until I find the fundage it'll have to wait (unless someone wants to buy a '68 camaro with tons of new parts - needs some assembly.) For now I have to run that grey area.

And are you sure that place isn't called 12th St. Repair? I know of that one and know some of the guys there.

I watch that attitude like a hawk, whenever it gets above 1.x% I'm backing off. The other day I was racing a Harley Fat Boy and got looking down at it and was seeing 12-13% slip!!! I have the edge programmed to back down (I thought) and I've read the 3 or 5% slip limp mode. Neither occured???

I take it that the truck wanted to keep going. Are you sure the TC was locked?

I know I need to upgrade the tranny (you're beating a dead horse there) but until I find the fundage it'll have to wait (unless someone wants to buy a '68 camaro with tons of new parts - needs some assembly.) For now I have to run that grey area.

Sorry! I know what you mean. I saved for mine for a year.

Limp happens when the TCM sees clutch pack slippage.

It will not limp when slipping the convertor (I know this because while the *** shows me locked in 5th gear, on a full stack roll on accel, my tach shoots to 3300RPMs tech 2 says locked as well, but my acceleration is not keeping up with the tach progression yet my slip monitor shows.9%)

That said, 380-400 RWHP is the limit to what a stock TC can hold lockup. The transmission 'limps' when the tooth count goes out of sync in the clutch packs.

Limp happens when the TCM sees clutch pack slippage.

It will not limp when slipping the convertor (I know this because while the *** shows me locked in 5th gear, on a full stack roll on accel, my tach shoots to 3300RPMs tech 2 says locked as well, but my acceleration is not keeping up with the tach progression yet my slip monitor shows.9%)

That said, 380-400 RWHP is the limit to what a stock TC can hold lockup. The transmission 'limps' when the tooth count goes out of sync in the clutch packs.

Absolute bull$hit. Slipping converter will set a code and inhibit torque converter lock up and most times inhibit 5th gear. That my boy is a limp. There are many different limps in the Ally. When this happens you will have elevated line pressure and you will feel clunks on a downshift. Some people don't seem to notice the clunks but they are there.

Absolute bull$hit. Slipping converter will set a code and inhibit torque converter lock up and most times inhibit 5th gear. That my boy is a limp. There are many different limps in the Ally. When this happens you will have elevated line pressure and you will feel clunks on a downshift. Some people don't seem to notice the clunks but they are there.

Hm. Seems that you have a gap there Mike. Tech 2 CONFIRMS lockup is engaged. Attitude shows almost 0% slip. And no codes are set or stored as a result.

Not bull$hit. Fact.

I know the *** said it was locked in 5th. Yes the truck keep pulling. SOTP felt great. (By the way the Fat Boy LOST!!!) I tried to immitate it again tonight but it wouldn't do (or I was scared - one or the other) although I only accellerated upto 80, the other night I was past the 80 mph point when the major slip started. I did notice that throughout the accelleration in 5th the slip meter would go upto say maybe 2-3% then back to 0-0.6%, the back-down % never changed, I then checked the records and the backdown was 0%.

Mike L. -- I've felt the clunk on downshift before, but it wasn't doing that. I kept driving it for about 15 miles, about 5 stop signs so 1st gear upto 5th gear, then town driving. Tranny acted absolutely normal.

Hm. Seems that you have a gap there Mike. Tech 2 CONFIRMS lockup is engaged. Attitude shows almost 0% slip. And no codes are set or stored as a result.

Not bull$hit. Fact.

FWIW Remember the attitude measures RPM vs output shaft speed for it's slip calculation (info straight from Edge). Your TC might not be unlocked but you could be slipping somewhere else down the line. Just a possibility. When mine limped I definately had a TC unlock with a large clunk and the RPM's redlined with lots of slip. Of course that was with the stock tranny. C2 clutches and steels were a bit scorched when we tore it down.

FWIW Remember the attitude measures RPM vs output shaft speed for it's slip calculation (info straight from Edge). Your TC might not be unlocked but you could be slipping somewhere else down the line. Just a possibility. When mine limped I definately had a TC unlock with a large clunk and the RPM's redlined with lots of slip. Of course that was with the stock tranny. C2 clutches and steels were a bit scorched when we tore it down.


This i understand. BUT .9% slip does not explain running out of RPMs AND only going 75 MPH (and accelerating slowly i might add)

As far as the Tech2 and attitude are concerned everything is A-OK):h

This i understand. BUT .9% slip does not explain running out of RPMs AND only going 75 MPH (and accelerating slowly i might add)

As far as the Tech2 and attitude are concerned everything is A-OK):h

Seems suspicious. I know when mine limped my truck quit accelerating. Maybe one of the shaft sensors isn't working correctly? I'm just guessing and since you have a TechII you probably know what is and isn't broke if anything.

Seems suspicious. I know when mine limped my truck quit accelerating. Maybe one of the shaft sensors isn't working correctly? I'm just guessing and since you have a TechII you probably know what is and isn't broke if anything.

Beats the H out of me. All I can report is what I have observed. Using the same conditions and going WOT thru all the gears does not reproduce the taching out syndrome.

Going to pull the inspection cover tonight and look at the TC.
Fluid is as new, not discoloured and smells like.... like tranny fluid. Does not smell burned.

One thing is certain, Stock convertors are great things with stock ---> 400 HP.

Beyond that they just don't cut it.