I have been having 2-3 shift problems under WOT with the 60e. I have gone through 4 tranny rebuilds and I do not want to go through another one. Would I benefit by putting a th350 or th400 in my car? I guess I might or could have a faulty PCM. What would my symptons be if I did have a bad PCM as far as my tranny goes? I had a bad TPS sensor and it was replaced thinking that my cure the 2-3 shift under WOT but no, it still isn't hitting like it should. Any input on this would much be appreciated. When the tranny was rebuilt all the times, everything was gone through. They just couldn't get the 2-3 to ever hit.

ANY IDEAS??

Thanks
Mike

 

Are you saying it does not shift from 2 to 3 at WOT and stays in 2nd gear?

TH350 or TH400 is only needed to race. You lose the ability to tune through the PCM and you lose the OD.

 

I HAD THE SAME PROB UNTIL MY TRANS BLEW UP LAST NIGHT!!!LOL

I would stay 4L60E and get a race built trans from Frank at CPT, he has some fast cars running 4L60E trannys with no probs.

http://www.geocities.com/cahallperfo...sions/CPT.html

 

Yes, I keep it in drive and it will not hit the shift like it should, just pegs the rev limiter until I let off the gas. But............ I just might have got some good news.. I was told that the productions cars of year 96 ( 6 months before and 6 months after ) has had these problems..

solution: 2 ground wires going to the PCM has to have the pins changed on them and put into another location on the harness into the PCM and you have to add another ground strap. I am getting the wiring diagram and will see if it works or not. If it doesnt, I am stumped.. I was thinking about going th400 though.


-Mike

 

Have a simular problem, let me know if this solves youre problem...

 

OK...Let's start here. If you've had your 60E rebuilt that many times and it keeps failing, obviously something is wrong...My guess would be a non-informed transmission builder(s). There's absolutely no reason why a properly built 60E won't carry you well into the 10's, and hold up just fine while doing so. There are many design flaws in a stock 60E that need to be addressed to make it a great racing transmission. Unfortunately most transmission builder don't know what they are. After spending many years in the R&D area of racing 700/4L60E's, I can assure you I know what it takes to make one work correctly, AND LIVE.
The TH350 is a pointless swap, because the 350 isn't really any stronger than a PROPERLY built 60E. The 350 is, however, cheaper. The 60E also has a steeper first gear, which means a 60E will usually out 60 ft. a 350 in the same car
The TH400 is simply the strongest automotive transmission ever built for a factory vehicle. The swap is costly, though. Driveshaft, crossmember, torque arm mount???
How much street driving do you do? I've got a '93 Camaro that runs 12.0 N/A with a 700 in it that still gets 18 MPG. Checked the prices of fuel lately?...LOL Call me silly, but I like 4th gear

I'm still adding stuff to the web page, but if you'd like to check it out, you can go here.
http://www.geocities.com/cahallperfo...sions/CPT.html


Frank
CPT

 

Yes, it is my everyday driver. It's not that the tranny wont last, it's the 2-3 under WOT thats not performing. But then again, does the 2-3 shift have anything to do with the tranny failure when it is pegging the rev limiter all the time? Let me ask you this, What would you charge me to build me a 60e with me shipping you mine that is fine and was just rebuilt? I refuse to spend another $1000.00 for a rebuild unless im assured that the 2-3 under WOT would be taken care of. I was thinking more along the lines of $500.00 including my core charge. If you could do me one for $500.00 and me shipping you one that was just rebuilt, I would do this pretty soon. I am pretty sure all the parts dont cost over $500.00. Never know though....


Mike

 

I agree with Frank. The 4L60E can be built to handle lots of power. It does cost a bit more to build, but you just can't argue with a 3.06 first gear and overdrive. Mine has been built twice in 10 years of racing. Once by Rossler in 1995 and the latest which was last year by Dr. Trans. in Hanover, PA...It was $2000 leaving him the car, but its got all the good stuff, 5 gear planetaries front and rear, heavy duty shell, kevlar band, a servo with 40% more apply than the Corvette style, all sorts of little tricks that can only come from years of experience with overdrives..etc, etc....sounds like you just need to find someone who SPECIALIZES in the 700/4L60E...Frank, Eric Shertz, Carl Rossler, Century Transmissions...Mine is supposed to handle 650 fwhp...so far so good after a season of abuse...
--Alan

 

Prices are on my web page. And yes, parts will total near $500. Yes, you may find cheaper transmissions, but they aren't built with the same quality parts I use. I know why you're having the WOT 2-3 shift problems. It's because none of the previous builders built the transmission correctly. If you search this board, you'll find a common thread concerning the WOT 2-3 shift. Do a search for RACINLT1. His car was running consistant 11.0's @ 124 MPH (IN drive) with one of my 4L60E's. Ask him if he ever hit the rev limiter on the 2-3 shift. If you only plan on spending $500 on a 60E rebuild, you will definitely be pulling it back out again.
If you want it done RIGHT, I'll do it for you. If you want it done CHEAP, I'm not interested. Remember...Two $500 rebuilds equal one GOOD $1000 rebuild.

Frank
CPT

 

Let me see if this diagram fixes the problem I am having. I just need to make sure it's not electrical before I spend more money for a rebuild. The tranny is fine now, just that WOT 2-3. They charge $950.00 for a rebuild btw.. and i'm not knocking them or anything, I just want this 2-3 corrected. I mean I could have a faulty PCM or it could be as simple has adding the ground strap and changing to connections where the connectors go into the PCM. Well let me do some investigating and i'll get back with you. Could you maybe give me some suggestions as to what I could maybe do to fix the 2-3 WOT?


Thanks
Mike

 

Mike,
You can try fixing it electrically, but you'll eventually find that it's a problem in the 3-4 clutch pack.

Frank

 

3-4 clutches? have you seen the mail i have sent to youre registred E-mail adress? If so let me know.....

 

Lisa, You've got mail

Frank

 

Frank: thanks for the good tranny advice, with which I agree. However, the site rules do prohibit unpaid advertising and I think aspects of your post cross the line in that regard. Please refrain from advetising your business, unless you want to become a paying sponsor!

Thanks.

Rich

 

I wouldn't recommend a TH400 except for a big-block, forced induction, nitrous fed "animal", since they're heavier, take more power to turn, and have worse ratios than a TH350! Yes, they're nearly bullet-proof, but a good built TH350 (or 4L60E, according to this thread) can take just about anything that a 5.7L small-block can throw at them.

4L60E / TH350 / TH400
1st: 3.06 / 2.52 / 2.48
2nd: 1.63 / 1.52 / 1.48
3rd: 1.00 / 1.00 / 1.00
4th: 0.70 / ---- / ----

Looks like the 4L60E has the best ratios, as long as it can take the power.