jlightning22

The posts i have read leave me at a stalemate on what fluid to put in the trans when a flush and fill is to be done..... I am a believer in sythetics and would spend more for the piece of mind (like engine oil) anyone have a clean cut answer?

mustangnut

lightnings come with synthetic need to keep it that way

SWThomas

Lightnings do not come with synthetic transmission fluid. I don't know where you heard that from mustangnut...

To answer the original posters question... It has been said that synthetic fluid is too slippery for our transmissions. Although some people use the Mobil 1 Synthetic, Amsoil Sythetic and Royal Purple Sythetic and haven't had any issues at all. Greg Evans is the authority on these transmissions and his advice is to use the cheapest fluid you can find. I use NAPA Mercon/Dexron III and it's plenty good. Basically any Mercon or Mercon/Dexron III will work. DO NOT USE Mercon V fluid!!! If you want to spend the extra money for sythetic, more power to you. But like synthetic motor oil, it's not needed.

GK_crewchief

How often should it be changed?

__________________


*Built and Tuned by Arthur Todd in Conway,SC*

Street Tune: 621HP/650RWTQ at 16psi 14* timing 93oct. Fuel with 6lb lower/3.5" upper

Kenne Bell 2.6L
AVT Built Motor with Manley Rods, Manley Pistons and all ARP Hardware, JLP Stage II CNC Ported Heads, Stage II Comp Cams, Custom Air Box and 4" Intake Tube, SCT BA2400, JLP/Bassani Competition R 3" Exhaust, JDM Electric Fan Kit, JLP Powercooler, AFCO Heat Exchanger, Walbro fuel pumps, 60# Injectors, FTVB, F-250 Super Duty Transmission Cooler, JLP Traction Bars, QA1's all around, So-Cal shock extenders, Nitto NT555's, HID kit for headlights and fogs, Carbon Fiber radiator shroud, wire loom, and battery terminal covers.

SWThomas

The owners manual says every 30K miles. I do mine every 15K just because I'm anal.

tonysailor

talked to Jerry at Mag Hytec...

he sells ATF 1107 and monolec 7500. The 7500 is the best.

I have used it and never had an issue in either my L or HD.

Tony

SWThomas

Expensive fluids are not needed in the 4R100 transmission. It's been said by 4R100 expert Greg Evans that the cheapest stuff you can find is perfect for the 4R100. I can't justify spending the extra money on synthetic trans fluid or any other high-priced fluid.

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5.0Stanger

If you put anything near 12k on your truck per year, it's a good idea to change the fluid and filter then. I use Mobil 1 Mercon V. Since I race the truck over the year, I just change the fluid at the end or before each race season.

GK_crewchief

I need to flush mine soon. Been almost 15000 miles.

__________________


*Built and Tuned by Arthur Todd in Conway,SC*

Street Tune: 621HP/650RWTQ at 16psi 14* timing 93oct. Fuel with 6lb lower/3.5" upper

Kenne Bell 2.6L
AVT Built Motor with Manley Rods, Manley Pistons and all ARP Hardware, JLP Stage II CNC Ported Heads, Stage II Comp Cams, Custom Air Box and 4" Intake Tube, SCT BA2400, JLP/Bassani Competition R 3" Exhaust, JDM Electric Fan Kit, JLP Powercooler, AFCO Heat Exchanger, Walbro fuel pumps, 60# Injectors, FTVB, F-250 Super Duty Transmission Cooler, JLP Traction Bars, QA1's all around, So-Cal shock extenders, Nitto NT555's, HID kit for headlights and fogs, Carbon Fiber radiator shroud, wire loom, and battery terminal covers.