I need to know how much oil and what kind of oil a 2003 GMC Sierra 2500HD takes I need to know how much transmission fluid and what kid a 2003 GMC Sierra 2500HD takes I need to know what size the washer fluid container is on a 2003 GMC Sierra 2500HD.

Take it to an Auto transmission service center and give the box a full service and they also should fix the problem

they are different years 1999 is up to 2000/2001 then the 2003 is 2001 to 2004/5. auto box module works different, box's look the same but the sensors are different inside you would need to change the auto module and pair it to your ecu on your engine.

that atf stand for automatic transmission fluid also in the transfer case you need 80w90

Muncie 4 (117MM) speed---Lubricant Type---------80W-90 Gear Oil
Muncie 5LM60 (HM-290) 4 & 5 Speed ---------Lubricant Type------Syncromesh Trans Fluid T2850

Oil Capacity= 5 Speed (85mm & 109mm)--3.6 pt (US)
(New Venture Gear 4500)--8pt (US)

4 Speed= (85mm)--3.6pt (US)
(117mm)--8.4pt (US)


Hope this helped you ??

85 or 90w will be fine, take the differental plug out and add fluid until it just does start to run out of check hole

dextron 111

I will assume you have already drained the trany. You could have measure the fuid out and replaced all but a quart. Estimate what you took out minus a quart and run the trany through all the gears. let is set and measure what you need. Even simpler, get the manual for the unit and look up maintenace.

you will have to take it to a specialist near you. nothing else you can do.

Needs trans fluid change.

Check fluid level in clutch master cylinder, if fluid is full then bleed clutch system.

If you still have no pedal resistance you will need a new master or slave cylinder for the clutch.