Can anyone tell me the difference between the CTF and non CTF 4L60E? The only thing I have been able to find is that there is an "internal design change", and that was from my local dealer and multiple salvage yards.

 

If CTF means 'Computerized Transmission Function', then all 4L60E's would be CTF... I can find no reference to CTF in my ATSG 4L60E manuals though (or any of my references for that matter).

What is the context behind this question? What are you driving?

In 95, the 4L60E was updated to include a TCC (torque converter clutch) PWM (pulse width modulated) solenoid which would gradually apply the TCC when lockup was requested. These transmissions are not backwards compatible to the 93-94 4L60E applications as the ECU in these trucks does not have the proper programming to control the TCC PWM solenoid.

 

I just bought a 94 S10 Blazer 4x4 with a bad transmission, and it has the option of either the CTF or non CTF. Everything shows that the CTF is the one with the internal change. I know that it has a 4L60E in it now, since I have changed the fluid and filter. I was told by my dealer that mine is not the CTF option, and I have a friend with a used transmission that shows to be the CTF that I want to install.

 

i know a used one is always cheaper (in the begining) than a rebuild, but have you priced one out?

 

Im looking to get a used one from a friend out of a wrecked blazer, thats why I am trying to find the differences(if there are any). Otherwise I will go salvage for it. This is just going to be a low-buck winter beater, so Im trying to keep things as cheap as possible.

 

As I said, CTF does not show up anywhere in any of the official documentation that I have.

A 4L60E out of any 93-94 GM 4wd vehicle will work according to my interchange list. Anything 95+ will have the TCC PWM solenoid and are therefore not compatible with your truck.

 

[quote=jlhamm;260061]Im looking to get a used one from a friend out of a wrecked blazer, thats why I am trying to find the differences(if there are any). Otherwise I will go salvage for it. This is just going to be a low-buck winter beater, so Im trying to keep things as cheap as possible.[/quote]

and, as we all know, that route will never leave you stranded in the middle of nowhere, during the worst day all Winter.