What type of Transmission fluid does this truck use?

Sure, here is the fluid type and capacity:

Fluid Types - Transmission Fluid Type

Type .................... DEXRON III or Equivalent

Capacities

Transmission Fluid

4L-60-E

Pan Removal .................... 4.7L (5.0 Qt)

Overhaul .................... 10.6L (11.0 Qt)

4L80-E

Pan Removal .................... 7.3L (7.7 Qt)

Overhaul .................... 12.8L (13.5 Qt)

Allison

Fill After Fluid and Filter Change .................... 7.0L (7.4 Qt)

Overhaul .................... 12.0L (12.7 Qt)

Please let us know if you need anything else to get the problem fixed.

Okay, thanks.

Good afternoon, HD2424,

I always go by what the manufacturer wants you to use. For your vehicle GM recommends DEXRON VI. Original you probably had DEXRON-III. My information says you will need 5-6 quarts for a drain and refill, but I would get 7 or 8 and just return what you don't use. Just to be safe.

There was a Technical Service Bulletin (TSB) released April of 2007 TSB-04-07-30-037C, then updated in 2011 04-07-30-037E. This TSB basically states 2008 and prior GM Passenger Cars and Light Duty Trucks, among others, should be changed from DEXRON-III to DEXRON-VI. (I will attach screenshots of the TSB for you.)

Normally the rule of thumb is to go by what is stamped on the dipstick, but I would follow the TSB in this instance and use the DEXRON-VI that GM recommends.

I have a 2001 Chevrolet Suburban with a 4L60E, and I use DEXRON VI.

According to the TSB, DEXRON-VI is compatible with prior fluids including DEXRON-III meaning you do not need to flush out the DEXRON-III first unless it's a warranty repair.

There are many fluids out there, most are universal such as Amalie. I would stay away from them all and use the manufacturer's fluid.

This fluid is a full-synthetic. In my opinion synthetic is better. It is chemically modified to provide many benefits including working better at higher temperatures or extreme cold as well as better viscosity which helps with horsepower-loss and fuel efficiency, as well as many others.

Thank you,
Brendon

thanks, bud exactly what i needed to know.

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