My 82 Silverado

[red4wd]

team39763 where do live?

[76 k10]

I have 3500rpm converter.

Here's another one.  Again, you can see I have a weak launch when I do the usual.  So I'm gonna try a different method that Lorne told me about.  Maybe my launch method is what caused me to have bad 60ft's at the track?
I didn't stall it up as high on this one, but you can tell I didn't put my foot into it until it after it got going.
http://s46.photobucket.com/albums/f143/team39763/?action=view&current=730313f8.pbr

what gears do you have? and how are you not even smoking the tires

[team39763]

I have no idea what my time and speed really was....they told me I trapped at 97MPH, but they were getting peoples' time and speed wrong all day.  They told one guy he ran 15.8@115mph and on his other run 13.4@78mph. Yep, it's a crappy track and I won't be going back.

Red4WD - I live in south Texas.  76 K10, I have 456 gears and I have no clue why it doesn't spin.  I just noticed this afternoon that my posi isn't engaging(once again).

[SUX2BU99]

In my professional non-professional opinion  it just looks like a lot of slippage. Either from high-stall converter, trans slip or slipping converter (malfunctioning). I agree with Lorne though that converter slip might be ruled out because you're getting very good MPH on the top-end. That's excellent MPH for 4.56s I'd say. What's your tach say when you're crossing the line? It looks like the motor is revving up fast in 1st, but you're only getting thru it moderately fast. Looks like 2nd and 3rd gear really rip. So that only leaves me to think that at WOT when the slicks are hooked, the 4.56's are providing a ton of torque multiplication and that 6.0 is pushing the power thru, your 1st gear is becoming the weak link and slipping? I would also think that with that kind of power and those gears, you should melt the tires but then again, maybe those gears are a little too deep for tire burning and the motor revs past the torque point where the tires would want to break loose. Perhaps that doesn't make too much sense. Might sound weird, but maybe something like 3.73s could make better use of the grunt your motor makes and would yank it thru the lower revs faster.

[team39763]

My tach doesn't read correctly, I'd say I was between 6000 and 6800rpms(judging from shiftlight and revlimit).   I'm gonna try taking my truck to the real track where it actually hooks up good.  I think my problem is that I'm too soft on the pedal, I don't mean to be, but in my head I'm picturing the tires going up in smoke and me not going anywhere at all.  When I get to the real track, I'm gonna put it on the floor and see how it reacts.  Everything you just said made perfect sense too.  I may be looking to get a few different sets of gears to test soon, 373, 390, and 410's are on my list.

[team39763]

I took the truck out to the backroads today just for fun(by myself).  First I did a little burnout(first one ever in this truck) to clean the slicks.  Then I stalled it up to 1400 and made sure I had traction before putting the petal to the floor, so probably about 5 feet before I floored it.  Shortly after I floored it, it felt like it was free revving or trans was slipping or possibly the tires broke loose.  I usually can tell when the tires break loose, but it felt different this time.  I shifted to second and slowed to a stop.  I tried it again, but this time I shifted to second right after I went WOT.  I'm starting to suspect my trans.  What happens if your converter is not fully seated?  Would I have known by now?  What if my trans cooler lines were backwards, wouldn't my fluid smell/look burnt?

[eventhorizon66]

I think if you didn't slide your converter all the way home and still managed to bolt it up to the flexplate.  You would know as soon as you fired the motor.  I'm sure there would be an unpleasant noise to accompany the subsequent pump damage.  And I wouldn't think that if you had the cooler lines attached backwards it would affect the way the fluid smells.  But if you have any significant slippage, that would definitely cause the fluid to smell burnt.

[team39763]

Ok, I checked and my lines weren't backwards.  The reason I was worried is because I have a remote mounted filter and if installed backwards(reverse flow), it would damage the trans.  The truck used to make a very high pitched whine at low speeds, but now it's gone.  I was unclear on whether I needed shims between the flywheel and converter pads, none came with my converter, so I didn't use any.  But I heard of others that used 1 or 2.

[red4wd]

Someone can correct me if I am wrong but I believe the only time you would need shims between the flexplate and the converter is if you were running a midplate.

[bigkountry]

Not to sound like a jerk but are you sure your throttle is opening up all the way? I had a similar problem on a Camaro I had, put a new carb on and the cable would not let it open all the way.

Just a thought, sometimes the simplest things can haunt us.

With your setup you should be roasting the tires, I don't have near the setup you do and I can fry the 35's on my 81 K10.

[team39763]

I didn't really think to check the throttle...good call.  I noticed that sometimes when I drive my truck, I find a little extra bit of pedal sometimes...as in I can stick my foot in deeper.  My pedal is really stiff, so it always feels like it won't go much further.  If I loosen the throttle return springs, it will idle too high.  Maybe I have them setup wrong.  How do I tighten my cable to make the pedal bottom out/go WOT sooner?

[HAULIN IT]

Team, We were just talking about that. Check the Engine/Drivetrain section. Everthehorizon started it, I believe. Lorne

[eventhorizon66]

Team, We were just talking about that. Check the Engine/Drivetrain section. Everthehorizon started it, I believe. Lorne

Way to hack up my user name Lorne.

But seriously, team39763, why would the tension of your throttle return spring affect your idle?  I can disconnect my return spring and it idles just fine.

[team39763]

My throttle never returns to the idle I set it to.  If I set the springs any tighter, the gas pedal is too firm.  If I set it more loose, the throttle will get stuck and it'll try to idle at 2000.  I went out and added a few shims on the pedal to make it hit WOT for sure.  LOL. I wish I would've seen that topic earlier.  Thanks guys, I'm gonna give it a try tomarrow.

[HAULIN IT]

Team, Please stop & figure out why the engine will not idle with the spring removed. As was mentioned, the spring should have NOTHING to do with the idle. Something is wrong here. Try to figure out what it is. This could be unsafe to you & anyone around your vehicle. It would be a shame to crash your truck over something like that. Try unhooking the cable from the carb. Is the pedal/cable free? Does the throttle plate open & close free? One of them has to be the problem. If you need help, Ask, Lorne