O.K. I'm 43 years old and usually don't drive my 07 GT very hard and so heres the question .
What is serious HP for a stock 5R55s ? I mean where is the cut off for a stock trans on Hp and Tq for Sunday driver like myself . My car dynoed at 412 rwtq so If the tuner set the trans with factory solenoids to shift as normal as possible to last . What am I to exspect and what is the limit ?
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2007 GT auto-Whipple with 8psi
Nitto NT05
GT500 fuel pump 54 lb injectors
438rwhp 412rwtq
1/8 ET 7.79 60ft 1.92
otherwise stock-even the suspention
for a sunday driver, heck even a DD, i have seen mustangs with the 5R55RS with far more power and have no issue. After 500 it starts to strain a bit but the 5R55RS is a solid trans.
550 ft lb of torque is the factory design limit, hence the 55 in the 5R55S.
A 4R70W is supposed to be capable of 700 ftlb of torque, hence the 70 designation.
O.K. I'm 43 years old and usually don't drive my 07 GT very hard and so heres the question .
What is serious HP for a stock 5R55s ? I mean where is the cut off for a stock trans on Hp and Tq for Sunday driver like myself . My car dynoed at 412 rwtq so If the tuner set the trans with factory solenoids to shift as normal as possible to last . What am I to exspect and what is the limit ?
O.K. , I`m 56 yrs old, so what`s that got to do with how hard you drive your car ? LOL.These cars are too much fun to go easy. If you don`t plan on doing much more I wouldn`t worry about it. I had problems with the factory solenoids, but not until around 440 RWHP, and it was set up to shift pretty hard.
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`06 Redfire GT Premium Coupe,398 Stroker,Whipple Supercharged,Comp Cams, Ford Racing CNC ported heads & throttle body,4:10`s with Eaton posi,Moser 31 spline axles,5R55S auto trans w/billet 3500 stall converter by Level Ten, TCI ratchet shifter,BMR K member ,A arms,trailing arms & drive shaft loop,aluminum drive shaft, ,BFG KDWS`s on Am Racing,CDC chin spoiler,Roush rear wing,custom roll bar by JW Racing & fabrication Shelton Conn, engine & tuning by Jannetty Racing Waterbury Conn.
O.K. , I`m 56 yrs old, so what`s that got to do with how hard you drive your car ? LOL.These cars are too much fun to go easy. If you don`t plan on doing much more I wouldn`t worry about it. I had problems with the factory solenoids, but not until around 440 RWHP, and it was set up to shift pretty hard.
Well, when I was twenty I would nail the car everyother stopsign . These days its more like every other drive . But I still like the speed, hell I love it ..
Anyways its sounds like the stock trans can easily handle under 500rwhp and thats good. When I set up the rear suspention this winter I was wanting to take it back to the dragway and I was a little conserned .
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2007 GT auto-Whipple with 8psi
Nitto NT05
GT500 fuel pump 54 lb injectors
438rwhp 412rwtq
1/8 ET 7.79 60ft 1.92
otherwise stock-even the suspention
5R55s stock outer limits ? 
LOL.These cars are too much fun to go easy
. If you don`t plan on doing much more I wouldn`t worry about it. I had problems with the factory solenoids, but not until around 440 RWHP, and it was set up to shift pretty hard.
