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post #22 of (permalink) Old 09-07-2013 Thread Starter
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Ricter55's Avatar
Joined: Dec 2010
Location: Mesa
Posts: 85
Exclamation A/T RPMs exceeded limit...

Originally Posted by Radioguy View Post
While the engine certainly sees much higher forces as the RPM are increased, transmission is also subject to increased forces when the engine RPM is increased. Ford uses the 6R80 transmission in other vehicles, including the F-150 with several engines. In that appliocation Ford says:
"Ford says the 6R80 has been through 150,000 equivalent miles of testing cycles that reflect the most extreme-use customers, and the box itself is rated up to 7,000 rpm and the fluid is filled for life."

See: Compact Equipment Online - Purpose Driven

So it isn't only the engine that can be subjected to extreme forces when the engine RPM begin to exceed the red-line.
My boss discovered that the A/T has RPM issues too. He was moving fast to negotiate traffic that might have his exit blocked and didn't see one of those smoothish Rail Road crossing humps until it was too late to slow down. So he tried to minimize risk of bottoming out (severly lowered Charger R/T Hemi 450+ H.P.) by accelerating to 55+ mph in a 45. His car went air borne with his foot on the accelerator. Engine shut off immediately and displayed an error code. He coasted to the exit and turned off into the first drive-way. Opened the hood and everything looked okay. Looked under the vehicle, even though no scrape took place, nothing dangling. Got back in and it started up but with the error code still there. He drove his baby ($20K+ in mods) straight to the speed shop that dyno-tuned and wrote his tune programs. The code translated to, 'transmission RPMs exceeded safe maximum!' Code cleared just fine... no more un-filed flight plans since!

2011 V6 3.7, 3.55 gears, Pony Pkg, Kona Blue, JLT CAI box & cone w/MMR CAI tube. Magnaflow perf/st axle-backs & MF uni x-pipe w/fab mid-pipes. BMR Shortys & 73mm? throttle body w/matching spacer. Whiteline SOLID front & rear sway-bars. Heat shield manifold to eng. Accel coils w/Pulstar plugs. 4 bolts ea side strut tower brace. Have SCT tuner w/91S, 91P, 91R BAMA tunes. Currently using Diablosport Trinity 1000 w/91 octane Dyno-Tune . Soon BMC Black Mamba carbon fiber hood.
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