I recently purchased a 2006 lly w/ 95,000 mi. tranny has never been flushed and fluid is in good shape, red no burnt smell.wondering if I should have it flushed or just drain it and replace the filter and if so what fluid should I use that is compatible with current fluid.
Just change it! I had my (last) truck flushed and had problems ever since and now I have a new truck. My brothers good friend works at Ford and said that it might make an existing problem worst and then again it might be just fine
Always remember that there is a possibility of you getting someone's trash when hooking your tranny up to a flush machine,better off doing it by hand..
__________________ MINE2006 GMC 2500HD4x4 sb cc LBZ!Got a couple lil mods,more to follow
[color="Blue"]02 GMC 1/2 ton,2wd,5.3 power{Mama's ride}
87 SS Monte Carlo 77k[orig!]
78 Malibe [2dr.]350/350 WORK RIG:03 YukonXLHypertech tuned!!310k miles! The left lane is used to pass,so get over,or we'll run over ya asssss!!1996 Impala SS on the way!!!
IIRC allison does not recommend a flush of any kind. Just change the fluid.
X2. It could delaminate the clutches. If you want to do a complete exchange you can disconnect the trans. cooler return line and drain into a bucket. Just run the engine for 2-4 seconds, turn off and replace with new fluid. repeat until clean fluid comes out of the hose into the bucket. It will take about 5 gallons to do this.
__________________ 2007 GMC K3500 Classic LBZ/Allison, SRW, 4WD, Ext. cab,Sport Metalic Red, FS2500 bybass oil filter
Deep transmission pan/w Transynd
Cognito idler/pitman Arm Braces
EGR Blocked with Fingerstick
PCV Re-Routed, Fuel Filter Bleeder kit
MBRP 4" SS cat back exhaust
BD performance exhaust manifold
4Wheel Pop-Up Camper
AUX. input for my MP3 Player
bad bad bad, no flush, it will f up anything from a 4l60e to an ally 6
__________________ 06 LBZ 3500 4x4 single rear wheel regular cab long bed WT. PPE economy, 4" turbo back straight pipe, solid gooseneck, drw wrecker prep springs, blocked, fingured, 2"plugged, and plenty of UWS boxs. work in progress
X4 on not flushing the transmission. I just drained the pan and replaced the spin on filter when I brought home the used 2500HD in my sig.
Did we mention NOT to flush it???
__________________ MINE2006 GMC 2500HD4x4 sb cc LBZ!Got a couple lil mods,more to follow
[color="Blue"]02 GMC 1/2 ton,2wd,5.3 power{Mama's ride}
87 SS Monte Carlo 77k[orig!]
78 Malibe [2dr.]350/350 WORK RIG:03 YukonXLHypertech tuned!!310k miles! The left lane is used to pass,so get over,or we'll run over ya asssss!!1996 Impala SS on the way!!!
I do not even change the fluid. I had a truck with 180,000 on the clock. I never changed the fluid. They guy that bough the truck changed the fluid the next day and the transh took a shit. All the clutch material in the fluid is good for it it keeps everything working you take the material out and it starts to slip.
I NEVER EVER CHANGE THE TRANS FLUID IN ANY VEHICLE I OWN AND I HAVE NEVER HAD A TRANS PROBLEM!!!!!!!
__________________ John
05 4 door short bed 4x4 chevy LLY
EFI LIVE with McRat tune, DPS5, PPE Lift Pump, 4inch Turbo Back Strait Piped MBRP Duals, EGR block off, AFE stage 2 intake, Turbo resonator blocked off, 6000k HID kit, 305/75/16Super Swampers on stock rims, Auto Meter boost and pyro gauges, Killer sound system, Limo tint all the way around, Suncoast Stage IV built by me. NO TALKING JUST LINE IT UP
I do not even change the fluid. I had a truck with 180,000 on the clock. I never changed the fluid. They guy that bough the truck changed the fluid the next day and the transh took a shit. All the clutch material in the fluid is good for it it keeps everything working you take the material out and it starts to slip.
I NEVER EVER CHANGE THE TRANS FLUID IN ANY VEHICLE I OWN AND I HAVE NEVER HAD A TRANS PROBLEM!!!!!!!
I heard not to fool with it at all unless ya make a habit of it early on...
__________________ MINE2006 GMC 2500HD4x4 sb cc LBZ!Got a couple lil mods,more to follow
[color="Blue"]02 GMC 1/2 ton,2wd,5.3 power{Mama's ride}
87 SS Monte Carlo 77k[orig!]
78 Malibe [2dr.]350/350 WORK RIG:03 YukonXLHypertech tuned!!310k miles! The left lane is used to pass,so get over,or we'll run over ya asssss!!1996 Impala SS on the way!!!
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Got a couple lil mods,more to follow
310k miles!
Don't flush!!!! 
Linear Mode
