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Old 07-19-2008, 09:44 PM   #1
99_Z71
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Changing trans fluid
The trans has been slipping for a bit on me so I decided to change the fluid. When I do, I was thinking of adding a deep pan and wanted to know if anyone has this pan and if its any good:


Derale Transmission Pan Coolers use the air flowing beneath the vehicle to reduce fluid temperatures from 20°F to 50°F. Features include heavy-gauge stamped steel construction, patented turbulator cooling tubes and a zinc plated finish. Increases fluid capacity. Replacement pan gasket included. Will not fit applications with OEM deep pans. Adds 2 QTs.

3.5" Depth, Tube Depth is at 2.38", Drain Plug Included.
'99 Tahoe Z71, on your basic 265/75/16's
MSD coil
MSD 6A ignition
Accel cap and rotor
taylor wire set
Volant CAI
Flowmaster 40 Series Si/So with
Edelbrock TES headers
Jet Performance hand held tune
All for a 5mpg gain currently @ 20mpg
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Old 07-19-2008, 10:00 PM   #2
the dougler
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Re: Changing trans fluid
why not use a trans cooler, or larger trans cooler if you already have an OEM one? I would be afraid of those pipes corroding out from water/salt/mud and causing a far worse issue.
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Old 07-19-2008, 10:11 PM   #3
99_Z71
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Re: Changing trans fluid
That's what my thoughts were, but I wanted to check and see if anyone had tried it and what the outcome was.
'99 Tahoe Z71, on your basic 265/75/16's
MSD coil
MSD 6A ignition
Accel cap and rotor
taylor wire set
Volant CAI
Flowmaster 40 Series Si/So with
Edelbrock TES headers
Jet Performance hand held tune
All for a 5mpg gain currently @ 20mpg
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Old 07-20-2008, 03:36 AM   #4
gwashington4249
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Re: Changing trans fluid
I agree with the cooling lines on the pan...seems a little risky to me.

I bought a deep pan but it was from Trick Flow and held an additional 2 quarts and had external cooling fins cast into the pan. Looks great but the thing would NOT stop leaking for the longest time...took 4 gaskets before I finally got it just right.

I already have a OEM trans cooler but our summers here hit 110-120 regularly so I figured extra cooling wouldn't hurt.

96 Chevy K1500 5.7 Z71
65K miles
K&N FIPK
Edelbrock Headers
Flowmaster dual exhaust
Hypertech programmer
Royal Purple fluids
MSD wires
braided brake lines
cross-drilled/slotted rotors
heavy right foot
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Old 07-20-2008, 05:50 AM   #5
dave89iroc
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Re: Changing trans fluid
those are decent pans, and yes, they do help to keep the fluid temp down
ASE Master Certified Technician


1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR, CC Pro-Mag RRs, RPM Air-Gap , 4 barrel TBI, 7 qt. oil pan, Headman long tubes , not finished yet
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