VORTEC TM 8100 V8. Why is it jerky shifting? - 2005 Chevrolet Silverado 2500HD 2WD

https://www.google.com/search?q=2007+Chevy+Silverado+2500+HD.+TCM+location

Diagrams and videos in the link

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even flex fuel

• 5.3 L (325 cu in) Vortec 5300 LM7 V8 (Gen III) (1500 only)
• 5.3 L (325 cu in) Vortec 5300 L59 flex fuel V8 (Gen III) (1500 only) (2002-2006)
• 5.7 L (350 cu in) Vortec L31 V8 (2000-2002 Mexico Only)
• 6.0 L (364 cu in) Vortec 6000 LQ4 V8 (Gen III) (optional on 1500 in 2006; standard on 2500)[59]
• 8.1 L (496 cu in) Vortec 8100 L18 V8 (optional on 2500 only)

Could be an engine or transmission mount. If the transmission flares(hesitates then hits hard). I would service the transmission first, fluid and filter. I would also add a bottle of Lubeguard to it. When you pull the pan, check for metal, any kind of flakes or chunks in it, Put the pan back on and put the old fluid back in. Time for a rebuild or replace. The black stuff around the magnet is normal wear. If you have the check engine or transmission light on. Get the codes.

Thats a tough one, the computer problems are huge on swapping the v8 in.. If it was me I would use an older motor that's not running a computer..or a crate motor ...

OBD Codes ?

look in the vortec how to section in hekowrench.com

Change the Throttle Positioning Sensor.
Clean the Mas Air Flow sensor with carburator cleaner, carefully.
Vitally

most people dont say ya i will have that one and never test drive it

Different computer for sure, and probably a bunch of sensors, distributor, wires , starter, plug - ins, etc. The only way I would ever attempt that is if i had a whole perts truck to pick off of. You'd be far better off to fix the head gasket, sell it, and buy a truck with a V8 in it already, than to try that.

You did not give your engine size or other information, but here is a list from the handbook...

Cooling System Capacity (Approximate)
VORTEC
4300 V6
Automatic 12.6 quarts (11.9 L)
VORTEC
4300 V6
Manual 12.9 quarts (12.2 L)
VORTEC
4800 V8
Automatic 13.4 quarts (12.7 L)
VORTEC
4800 V8
Manual 13.7 quarts (13 L)
VORTEC
5300 V8
Automatic 13.4 quarts (12.7 L)
VORTEC
5300 V8**
Automatic 14.9 quarts (14.1 L)
VORTEC
6000 V8
Automatic 14.8 quarts (14 L)
VORTEC
6000 V8*
Automatic 14.4 quarts (13.6 L)
VORTEC
6000 V8
Manual 15.2 quarts (14.4 L)
VORTEC
6000 V8*
Manual 14.8 quarts (14 L)
VORTEC
5300 V8**
Automatic 14.9 quarts (14.1 L)
VORTEC
6000 V8
Automatic 14.8 quarts (14 L)
VORTEC
6000 V8*
Automatic 14.4 quarts (13.6 L)
VORTEC
6000 V8
Manual 15.2 quarts (14.4 L)
VORTEC
6000 V8*
Manual 14.8 quarts (14 L)

Crankcase Capacity (Approximate)
VORTEC
4300 V6
W 4.5 quarts (4.3 L)
VORTEC
4800 V8
V 6.0 quarts (5.7 L)
VORTEC
5300 V8
T 6.0 quarts (5.7 L)
VORTEC
6000 V8
U 6.0 quarts (5.7 L)

Fuel Tank Capacity (Approximate)
Short Bed 26 gallons (98 L)
Long Bed 34 gallons (128 L)
Chassis Cab 34 gallons (128 L)