89 GMC V2500 Burb WONT BURNOUT.

[Irish_Alley]

are you manually shifting to 1st?

[Greybeard]

If you are certain it isn't the tranny, are certain the engine is maintaining at whatever grunt it's got, and the gears are not something like 2.xx or something equally as tall then no other reason why it shouldn't at least chirp the tires. A burb isn't that heavy. Unless you have really wide tires on it. Go out and get a smaller torque converter. Back in the day some of the auto guys used Vega torque converters, I'm sure today there are better options however. They allow your engine to reach a higher RPM before grabbing. Otherwise, I have no more thoughts. If the engine is running OK and still has some compression, the tranny is known good, the gears are not so tall as to allow the truck to do 175 MPH on the highway at 2000rpm inn second gear, and the torque converter isn't slipping there isn't much left in the drivetrain to explain why it won't spin the tires on wet pavement. 

[1979C20]

The tires are 315/75r16, so 34.8 x 12.5. I have tried in drive or shifting into first manually. I need to put a tach on it to see where my rpms are when im power braking. The only thing I do not know is the stall on the converter. And my truck tops out at like 95mph.

[MANCHU1-9IN]

I wouldn't think a TBI350 had the grunt to spin 35's on a suburban no matter how fresh it is.

[Greybeard]

I tend to agree, that's a lot of meat and a heavy truck plus applying the brakes when you want to spin the tires? Buy a line lock and give your rear brakes a break. It seems apparent that your rear brakes are working really well. If you really want to go the power brake path crawl under the truck and back the brakes off. They will have to travel further before contacting the drums and give you a better shot (read that a slight possibility) of being able to overcome the clamping force of the rear brakes if you are very talented with your left foot. Power braking, BTW, is about as rough on a power train as you can be. Stalling the torque converter for that amount of time will create heat in a matter of seconds. MANCHU1-9IN said it right, 35's are tough for any stock engined truck to spin on the street, on a heavy truck like a Burb, fagetaboutit. You want to spin tires on that behemouth? Find a big block, build it for bottom end , use a manual tranny or at the minimum a really tight t-400 and it'll spin those tires until you run out of rpm.

Not trying to be insulting here, but you are sure it's a 350 and not a 305? If you didn't buy the truck new then there's no telling what weirdness prior owners may have perpetrated on the beast. Some people actually thought the 305 gave them better gas mileage. Silly people. 

[MANCHU1-9IN]

I tend to agree, that a lot of meat and a heavy truck plus applying the brakes when you want to spin the tires? Buy a line lock and give your rear brakes a break. It seems apparent that your rear brakes are working really well. If you really want to go the power brake path crawl under the truck and back the brakes off. They will have to ravel further before contacting the drums and give you a better shot (read that a slight possibility) of being able to overcome the clamping force of the rear breaks if you are very talented with your left foot. Power braking, BTW, is about as rough on a power train as you can be. Stalling the torque converter for that amount of time will create heat in a matter of seconds. MANCHU1-9IN said it right, 35's are tough for any stock engined truck to spin on the street, on a heavy truck like a Burb, fagetaboutit. You want to spin tires on that behemouth? Find a big block, build it for bottom end , use a manual tranny or at the minimum a really tight t-400 and it'll spin those tires until you run out of rpm.

Not trying to be insulting here, but you are sure it's a 350 and not a 305? If you didn't buy the truck new then there's no telling what weirdness prior owners may have perpetrated on the beast. Some people actually thought the 305 gave them better gas mileage. Silly people. 

^^ Well said. I am not sure if the older G80's are made the same as on newer trucks, but if they are then foot brake burnouts will make it go boom real fast.

[Greybeard]

Been down this road. I never grenaded a tranny or a driveshaft myself although I could power torque my Step-Mom's Dodge Dart with a 360 for a half a mile. 

Run it like ya stole it. Ummm...Let's not go there.....

[Irish_Alley]

my grandmother astro van would light them up also. took that thing in fields on some fun nights. lol but then i got wiser once i started replacing tires, now i dont spin unless in racing

[1979C20]

So, the number casted in the side of the block shows 880. Thr number on the passenger side front of the block shows "1M1029" and thats all I can see past the ac compressor. Im attaching a picture of the casting number on the back of the motor where the bell housing attaches. The VIN deciphers as 1:Chevrolet M:GM of Mexico plant. 10: month october 29: day of the month. What I found online for a casting number with 880 in it is: 10243880 99-05 2 or 4  bolt main, Vortec truck, Gen I crate motors and "ZZ4", roller cam, one piece rear seal. So that must mean it is not the original motor?

[1979C20]

Here is the picture of the casting number location. It doesnt actually show a number.

[Irish_Alley]

im going to go out on a limb here and ask what are those numbers or letters to the left of gm? just last week looked at a 72 307 look similar with gm raise like that but there was numbers raised right where im questioning the dust line

[Greybeard]

With the picture upside down I see to the left of the GM a 5.7L  or that it is in fact a metric motor (post 87). If things remainded the same on 350cu.in engines the numbers you need for an ID are on a boss at the very top of the block and behind the intake manifold. They might be where you found them on a boss near the fuel pump drive opening also. I'm not at all familiar with post 87 engines however. 

[1979C20]

Looking at the picture how it sits, to the left of GM it says 5.7L, below gm says Hecho En Mexico. I will see if I can find more numbers back there. Maybe closer to the intake.

[Irish_Alley]

look on the same area but passengers side.

[1979C20]

I will check on the passenger side as well as the middle where the intake is. One thing that really makes me think this is not the original engine is the engine VIN. The VIN states that it is a chevrolet motor, but my truck is GMC.