Hmmm. is it a 4 speed auto or 5 speed auto???? since it sounds a bit too high. My 05 Corolla XRS has a 6 speed manual with the 8500 rpm revving Celica GT-S engine so the gearing is very short in the XRS, yet it revs around 3500 rpm at 70 mph in 6th.
__________________ SSM 05 Corolla XRS 6 Spd VVTL-i 2ZZ-GE /04 Corolla S 1ZZ-FE (sold)
Unless the gear ratios are different ( a different final drive ratio???) on the Scion TC, my previous 04 Corolla S 4 speed auto revved at about 2800 - 3000 rpm at 70 mph and did not hit 4000 rpm till I would increase the speed up to 90 - 95 mph. You might want to double check with Toyota about it and have them check your gear box.
__________________ SSM 05 Corolla XRS 6 Spd VVTL-i 2ZZ-GE /04 Corolla S 1ZZ-FE (sold)
OK I got it that it is by design. There is nothing wrong with the transmission. The TC auto tops out at 125 mph and has only 4 gears in it. The final drive ratio is small on your car most likely so that it can accelerate to the top speed of 127 mph the final gear must be geared short. Especially when I see my XRS 6 speed manual tops out at 135 mph with 6 gears, which is a mere 12 mph more with 2 more gears.
__________________ SSM 05 Corolla XRS 6 Spd VVTL-i 2ZZ-GE /04 Corolla S 1ZZ-FE (sold)
Based on the ratio of 70mph to 3000 rpm, it would take 7250rpm to get the car to 125mph if that is truely the top speed. That seems a little high to me. It sounds to me like your torque convertor isn't locking up. If when you are going 70 mph and you give it a good amount of gas if the revs shoot up then your torque convertor isn't locking up. That will not only shorten the life of your trans, but hurt your gas mileage.
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2005 Corolla XRS Silver Streak Mica
2005 Kawasaki Z750S Candy Plasma Blue
1993 Kawasaki EX500a Luminous Polaris Blue
You must have it in 3rd gear or there's something wrong w/ your transmission. Ensure that the car is in 4th gear, since it's easy to move the shifter to the left and pop it into 3rd gear. At 3500rpm my mom's tC is at 90mph w/ the automatic. 4k is 100mph, etc.
Both the automatic and the manual are carryover's from the Gen 5 Camry but the manual has a shorter differential ratio which makes the gears shorter in comparison to the Camry.
The E351 5spd manual for the tC has a 4.235 differential ratio vs. the Camry's 3.944.
1st 3.538
2nd 2.045
3rd 1.333
4th 0.972
5th 0.731
The U241E 4spd auto has a 2.740 ratio.
1st 3.943
2nd 2.197
3rd 1.413
4th 1.020
Ditto to what everyone else said.
With the torque convertor locked up, 2672rpm for 70mph in 4th. 3701rpm in 3rd.
Turn overdrive back on.
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Wassup guys...i just bought a tc today and noticed that when i'm on 5th gear, about 70 mph my rpm almost hits 3000. Is that normal? Wait i forgot to add in a very important detail...it's a manual. I had a civic and when i hit about 82mph that's when the rpm hits 3000.
Does the manual Tc have overdrive? If it does where the hell is it located?..Can't seem to find it. And i'm very concerned if that's normal or not. Any help would help guys. Thank!!
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Scion tC... Driving 70mph - RPM is on high on High 3000 and Just touched 4000
yea... 
Wassup guys...i just bought a tc today and noticed that when i'm on 5th gear, about 70 mph my rpm almost hits 3000. Is that normal? Wait i forgot to add in a very important detail...it's a manual. I had a civic and when i hit about 82mph that's when the rpm hits 3000. 
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