Truck doesn't want to shift from 1st to 2nd

[BLOWN454]

Has it ever worked properly since the tune and supercharger added? My first guess would also be a tune tweek since it doesn't have a TV Cable.

It did shift fine from first the second full throttle a couple times, but didn't shift fine just as many times. I have only been driving it around for a few days though.

 

[BLOWN454]

One other thing. I would stop doing WOT runs if it is shifting like that. Otherwise we will have to change your user name to Blown4L80E.

Hahaha I see what you did there!

 

[hotrodpc]

What your running into is a old transmission with more power thrown at it.
Suck it up and realize your going to need an OVERHAUL!!!

What is happening has nothing to do with not shifting. The transmission is actually shifting, but doesnt make enough fluid pressure to lock the clutches up. It's shifting, but slipping at the same time.
If you keep doing that, you'll burn it up! Untill you get funds for a good rebuild, just back peddle when its time to shift and things should last a little longer.

So what makes you think the transmission is bad Red??? I won't disagree with what is happening, but that wouldn't mean the trans needs an overhaul. We haven't been given much info to go on here so any suggestion is just based on an assumption. I'll also for certain agree, don't drive it creating this problem over and over, cuz yep, it'll sure cook the trans in short order. If what you are saying is true about the fluid pressure, a .500 boost valve maybe all he needs to correct his problem. But obviously, with a blown or supercharged Fo Fitty Fo, he needs a well massaged transmission.

 

[hotrodpc]

For B454, What RPM is this happening? What is the condition of the trans as far as age and mileage. You mentioned you just spend your savings building this thing, are you reffering to the transmisison, the motor of the truck itself? Have any mods at all been done to the trans, like a Corvette Servo or anything other than the power tune? If you had the trans built, what did they do to it to beef it up? I assume this is a 4L80-E trans and not a 4L60-E?

 

[Mixedbreed]

see what happens when i try to help!! sorry, i couldnt remember when they did away with it.
i will just sit here and look the threads... good luck blown454

 

[BLOWN454]

For B454, What RPM is this happening? What is the condition of the trans as far as age and mileage. You mentioned you just spend your savings building this thing, are you reffering to the transmisison, the motor of the truck itself? Have any mods at all been done to the trans, like a Corvette Servo or anything other than the power tune? If you had the trans built, what did they do to it to beef it up? I assume this is a 4L80-E trans and not a 4L60-E?

Its happening at full throttle shifts, so shifting around 4400-4600 rpms. The truck just turned 95,000 miles so its not way tooo old and it has lived a good life, fully documented and babied by my grandparents before I started driving it. As far as savings I meant the supercharger build and its supporting mods, not the tranny. Poor college kid budget. I kind of assumed that since even a supercharged 454 isn't making built diesel power and I know the 4L80E has a reputation for being quite stout from the factory for gas applications that I wouldn't need to worry about it. My first thought was that it was a tune issue and I never thought it was the tranny itself but who knows. Nothing physical has been done to the trans, I think corvette servos are only for the 4L60Es, I think. I sent an email to Westers tonight so I imagine I will have something in my inbox in the morning.

 

[hotrodpc]

Yes, the corvette servos are for 4L60-E's and 700r4. At 4600 rpm, you shouldn't be starving for pump pressure, although its still not a bad idea to increase the pressure, not so much for the added horsepower but for the added torque. I agree, lets see what the tuner boys have to say, then go from there. There still are some tips and tricks that might need done, like boost valves and servo upgrades. I'd have to look those tips up since I don't deal with 4L80's near as often as 4L60's.

 

[BLOWN454]

Yes, the corvette servos are for 4L60-E's and 700r4. At 4600 rpm, you shouldn't be starving for pump pressure, although its still not a bad idea to increase the pressure, not so much for the added horsepower but for the added torque. I agree, lets see what the tuner boys have to say, then go from there. There still are some tips and tricks that might need done, like boost valves and servo upgrades. I'd have to look those tips up since I don't deal with 4L80's near as often as 4L60's.

By pressure do you mean line pressure? Im not sure what all they did in the tranny part of the tune. I just told them I wanted it to shift hard and fast. I know nothing about that part of it, shift points, line pressure, etc. I barely got the thing back together and was genuinely surprised when everything actually started back up and ran.

 

[hotrodpc]

Yes, the corvette servos are for 4L60-E's and 700r4. At 4600 rpm, you shouldn't be starving for pump pressure, although its still not a bad idea to increase the pressure, not so much for the added horsepower but for the added torque. I agree, lets see what the tuner boys have to say, then go from there. There still are some tips and tricks that might need done, like boost valves and servo upgrades. I'd have to look those tips up since I don't deal with 4L80's near as often as 4L60's.

By pressure do you mean line pressure? Im not sure what all they did in the tranny part of the tune. I just told them I wanted it to shift hard and fast. I know nothing about that part of it, shift points, line pressure, etc. I barely got the thing back together and was genuinely surprised when everything actually started back up and ran.

Yes, line pressure. But now that you mention you told them to make it shift hard and fast, I'd be even more certain the problem is in the tune. Now it can also be that the line pressure is not high enough to perform the tune they installed. Whats more important than having a hard fast shift, is that you don't tear up your trans. I think I'd have them detune it a bit and your problem may go away. When you do have to to have the trans rebuilt, discuss some mods with your builder and explain to him what you want to accomplish, and if he is any good, he will make some suggestions for you. Things like boost valves, oversize servos, modified clutch packs etc.

 

[MR Redneck]

For B454, What RPM is this happening? What is the condition of the trans as far as age and mileage. You mentioned you just spend your savings building this thing, are you reffering to the transmisison, the motor of the truck itself? Have any mods at all been done to the trans, like a Corvette Servo or anything other than the power tune? If you had the trans built, what did they do to it to beef it up? I assume this is a 4L80-E trans and not a 4L60-E?

Well, the most important issue here is pressure. With added power, the transmission will require more pressure to lock the clutches up with it shifts.,
I dont know how many miles his truck has on it, but I'll bet it's a few more than a " fresh" transmission would have. Considering that, I would go ahead and do a basic freshen up , such as paper and seals.
He can increase to pump pressure, but that dont mean its going to hold up to tired old seals.
I just learned a long time ago to bite the bullet and get it all dont right the first time. Sure save a lot of BS for the future.