[Left Coast '32]

The 4L70E in the TBSS platform is alot different then a 4L60E in even the same weight vehicle.

The 4L60E doesnt have an input speed sensor where as the 4L70E does have the input speed sensor.

The 4L60E doesnt miss a shift due to differences in the input and output speed sensors like the 4L70E.

The 4L70E was supposed to be an updated and stronger version of the 4L60/65E but with the addition of the input speed sensor it made it weaker electronicly.

 

[1FAST07SS]

Congrats on your pass, just another reason to use rpm transmissions!:coolthumb:

 

[Silver SS]

Mine weighs 5220 on the scale by my house. Sum bitch is heavy

 

[Chase]

God damn Chris! You have a boat full of hookers?! Lol
RPM FTW

 

[Jeremy@RPMTrans]

The 4L70E in the TBSS platform is alot different then a 4L60E in even the same weight vehicle.

The 4L60E doesnt have an input speed sensor where as the 4L70E does have the input speed sensor.

The 4L60E doesnt miss a shift due to differences in the input and output speed sensors like the 4L70E.

The 4L70E was supposed to be an updated and stronger version of the 4L60/65E but with the addition of the input speed sensor it made it weaker electronicly.

The 4L70e does not use the input speed sensor for shifting. The input speed sensor gives the ECU more data for other functions. Your "electronically weaker" comment has no relevance what so ever.

 

[Grocery Getter]

?
My attention has been gathered...

 

[Jeremy@RPMTrans]

��
My attention has been gathered...

That has been the goal of this whole project. We wanted to show the industry that the 4L60/65/70e transmission line can be built to handle serious horsepower in a heavy vehicle and have a real service life.

 

[ForceFed]

I'm all ears....I'm Definately one pushing the limits with a 70 when everyone is telling me it cant be done. Granted Phoenix built this one, but it's holding 600+AWHP in my truck which I'm sure is roughly 800 BHP....and I plan on going farther yet again. I'm curious on a little more details (of course whatever you'll tell us, I understand proprietary mods) of this trans and what the major upgrades are for this power level are.

 

[Left Coast '32]

The 4L70e does not use the input speed sensor for shifting. The input speed sensor gives the ECU more data for other functions. Your "electronically weaker" comment has no relevance what so ever.

The computer uses the input and output speed sensors to determine slip and it must meet certain parameters to make the next shift. Too much slip and it wont make the next shift.

The 4l60/4l65 will complete the shift determined by output speed only making it superior by not missing the shift.

The missed shift will take the clutches out because of the engine hitting the rev limiter. The on off effect of the rev limiter is what burns up the clutches during a missed shift.

The 2006 TBSS's have a different operating system, 24X vs 58X in the 2007-2009. The 2006 TBSS's will keep a 4l70 much longer and handle more HP then any other year due to the differences in the operating system and the use of the input speed sensor.

*Wasn't it recently that you could not get a 2007 AWD TBSS with TVS1900 to shift with your transmission after telling the customer it would handle 600+ with your top of the line 4l70. You even used your recommended tuner for the transmission tune. Then after several 4l70 transmission swaps. The customer ended up with a 4L80 upgrade and has been great since!

It is not just your transmissions, all the other builders have had the same issues with the 4l70's. It is the operating system and the 4L70 that are the culprit. They are weaker electronically then the 4l60/4l65!

 

[martyjw597]

opcorn3:

 

[CHEVY6000TBSS]

Waiting on a rebuttal from RPM Trans...........:argue2:
opcorn3: opcorn3: opcorn3:

 

[Left Coast '32]

There is no rebuttal. The 4l70 has proven weak electronically in our TBSS platform since the beginning. The documentation is all over the site.

 

[CHEVY6000TBSS]

I'm in a picking mood today.....lol....still waiting on the other side of the fence argument to defend their product. ~TTT

J

 

[lt1z]

I'm in a picking mood today.....lol....still waiting on the other side of the fence argument to defend their product. ~TTT

J

You must have missed the part where they said they wouldn't recommend this trans for high hp in even a 4000 lb f body. They installed it to prove that it could live but never intended as a long term solution and they would recommend an 80, because of course they also build a bad ass 80.


The RPM 70 is a great choice for a tbss with less then 550 rwhp

 

[Left Coast '32]

I'm in a picking mood today.....lol....still waiting on the other side of the fence argument to defend their product. ~TTT

J

I am not saying they don't make a good product. This is about our platform and inherent flaws in the 4l70 and TBSS operating systems.

 

[CHEVY6000TBSS]

That has been the goal of this whole project. We wanted to show the industry that the 4L60/65/70e transmission line can be built to handle serious horsepower in a heavy vehicle and have a real service life.

The 4L70e does not use the input speed sensor for shifting. The input speed sensor gives the ECU more data for other functions. Your "electronically weaker" comment has no relevance what so ever.

These are the two I am referring to.

J

 

[Grocery Getter]

^^^^ intended for long term is what I see there....

 

[lt1z]

These are the two I am referring to.

J

They are considering a 4000 lb car as a heavy vehicle not a 4800 lb truck. I know that if you called RPM and told them you had a 750 rwhp TBSS that weighed 4650 they would recommend one of their 80Es. If you told them you had 460 rwhp they would recommend one of their 70Es.

 

[CHEVY6000TBSS]

Thanks for the clarification.
You would think a "Level 7" 60e or 70e (geezz all the way from a level 1) would be able to handle some serious power.

J

 

[lt1z]

Thanks for the clarification.
You would think a "Level 7" 60e or 70e (geezz all the way from a level 1) would be able to handle some serious power.

J

Power yes, power and 2.5 tons there is a limit.