Ok I got my gas rammed to the floor I get my car up to 3rd gear where you have to let off the accelerator for the automatic trans to shift into 4th gear, well when its in 4th gear the car wont go over 3000 rpm and if I give it more gas it shifts down to third. Has anyone else had this problem??? If so how did you fix it?

Thanks Chad

 

Welcome to "top speed"... time for some more mods.

Patrick DeGrosse Jr.

 

Are you referring to the downshift problem. If so, go to you local GM dealer they sell a part just for this. I hear it's better than the B&M one.

 

You need a new upshift valve. Go to a GM dealer and get a new one. They should know exactly what you need.

 

Thanks for all of you that knew what you were talking about. I am only a new member but I think that people that dont know what there talking about such as patrick007 shouldn't be allowed in these forums. Thanks to all the knowledgable 3rd gen owners.

 

Kinda harsh dude

Patrick does have a point. Its quite possible that your car hit the limiter (top speed set into your ecm) or your just maxed out. My old 305 would max out at 4k 115 mph and it was a 3 speed 200c non computer controlled. But it does sound like the upshift valve will help you at least keep it in OD for a bit longer.
SSC

 

What car and motor do you have? If you got an LG4 or LO3, I don't think stock you're going to have enough power in OD to push the car much faster.

 

Patrick and SSC are correct - certain engines DO have a speed limiter set in the eprom. Generally, if your car did not come out with Z-rated tires, GM gave you a speed limiter set between 120-125 mph.

There is also an "upshift" problem with the stock 700R4/4L60. Where the tranny will not upshift into 4th @ WOT. Check out the Tranny Board for the proper fix.

 

A word about the GM upshift valve kit. After using both the GM and the B&M, the GM is much better. The B&M valve can be installed at home, but I would recommend having a transmission shop or the dealer install the GM part. It comes with the valve, some springs, and spacers, and no instructions. It will allow WOT in 4th at anything above 50mph, where as the B&M only allows it for 3/4 throttle.

 

Aight, I got an LB9, do you know an approx. on how much it would be to have a tranny shop put it in? Is it really hard to put it in? Do you got to drop the trans?

 

It is not "really hard" to put in. In fact, it's not hard at all. The problem comes in with knowledge of transmissions. The tranny can stay in the car, but the valve body must be dropped, and a few other things have to be taken apart. Like it said before, the GM kit doesn't come with any instructions, so you're on your own, and it comes with a bunch of peices. If you got a book on the 700R4 and familiarized yourself with it, then you could do it yourself. Mine was done at a transmission shop while it was being rebuilt, so there was no labor charge. I would imagine it would be about 1.5-2 hours of labor at around $60 per hour, and in my opinion well worth it.

 

Im not in to tranny's at all. Damn 120$? You say B&M's is easier but not as good? Whats wrong with the B&M?

 

The GM one will allow you to stay in OD longer than the B&M. In fact you can stay in OD to the top of the gear with the GM upshift valve the B&M will only allow you to stay in od for 3/4 of the pedle depending on where your TV cable is set. The B&M valve is fine, enough to get a person killed anyway. $34 vrs $120 + labor to install. $34 sounds much better. I do agree With TGTA and you should have it insatlled at a shop. It can be done by a newbie but expect half a day and a 700r4 manual that will soon be soaked in tranny fluid.
I just installed the B&M upshift valve in my tranny and it was straight forward (good directions) and took 25 min to install but the tranny was out.
SSC

 

Harsh indeed.. and I really don't take kindly to that stuff. I will be sure to never attempt to help you again.

Patrick DeGrosse Jr.

 

It doesn't matter if you're in 3rd or OD at WOT throttle anyhow (talking EFI here) because in the computer chips there's a TCC unlock prevention threshold that is set to a certain MPH (about 85mph if memory serves) that will automatically lock up the TCC once you hit that speed regardless of what gear you're in. Real world gains with the upshift kits are very minimal and not worth the money IMO.