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Thread: TCase Question
11-22-2013, 10:59 PM #1
My 99 Sierra has push button 4wd but not the "auto" button so would my Tcase be auto or manual? The truck manual makes it sound like it is auto but everything that I have read online has made it seem that it is manual. Please help I need to know if I should put ATF or Autotrac II in it. Thanks
03 Chevy Silverado 1500 ext cab Z-71
79 AMC Spirit GT
77 Olds cutlass supreme
11-23-2013, 07:51 AM #2
I might be wrong here but id say use the atf....that what most use toll you get to the newer ones with the blue transfer case fluid. And there isntuch difference between the manual levered and push buttons, it just an electric motor that turns the shaft instead of a lever. If nothin else check your owners manual03 Silverado 1500
2 Blaupunkt 10" vW1000 subs in Subthump box
ProComp Level Lift & 3" rear blocks
11-23-2013, 08:35 AM #3
manual is when you have a lever ..since you have push buttons this is automatic.
auto 4X4 is an added feature to the 4X4 selection with the automatic 4wd.
now gm was using Dexron III in these transfercases. what GM did was replace this with the new improved trac II fluid.
I would call a dealership and with your vin they will tell you what to use and if they have the fluid in stock. you will need a little over 2 qts. only torque the plugs to 15 ft lbs..too tight you will crack the case. case is soft metal. open the fill plug first.drain with the vehicle warmed up from operation..
the transfercase works all the time ...so even it you do not use 4X4 very much it requires regular fluid replacing.
11-23-2013, 01:27 PM #4
nI would look at your rpo code in the glove box. the tcase code start with an N like NP8.
1995 Silverado 4x4
6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge
2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
2002 Silverado ext cab 2wd (Sold)
2003 Yukon XL (Totaled)
11-23-2013, 05:59 PM #5
11-23-2013, 06:16 PM #6
NP5 is the steering wheel
NP8 is the t-case (it's called an active t-case)Ray
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
11-23-2013, 08:09 PM #7
if you have RPO code "NP8" you have the NVG246 transfer case.
The transfer case requires Auto TracŪ II Fluid GM P/N 12378508
11-24-2013, 12:28 PM #8
11-24-2013, 05:32 PM #9
no but trac II is a better fluid. as I stated before GM used this dexron III back when your vehicle was OEM built. could be the OEM 1999 fluid still in it !
11-24-2013, 09:08 PM #10
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