I have a 1996 LT1 and 4L60e that I am converting to OBD1. Do I need to do anything to the transmission besides changing the 3-2 downshift solenoid? Thanx

 

Please be more specific about what year 4L60E you have and what PCM you are using with it.

 

The PCM is a 1995.

 

Hopefully pro builder Clinebarger will chime in here, but I believe the VB hydraulics are also different and you will need to swap in a complete '95 VB to work with the '95 PCM.
This member may soon have one available because he is going the other way:

https://ls1tech.com/forums/automatic...-possible.html

And here a detailed posting by Clinebarger are differences in the early years:

https://ls1tech.com/forums/automatic...vs-2001-a.html

 

The best thing to do is just run a '96-'97 PCM & leave the trans alone....Barring a really good reason to run a 1 year only '95 OBD 1.5 PCM???

If your hell bent on a '95 PCM....

Swap the Valve body AND Plate for a '95 models (With a PWM 3-2 solenoid).

If you swap a PWM downshift solenoid into a "On-Off" Valve Body, Your 3-4 clutch life will be compromised, The PWM solenoid never turns 100% off, And will not allow the 3-2 Control Valve to exhaust 3rd accumulator oil into the 3-4 clutch circuit as it should during a low speed 3-2 downshift.

 

Thank you for the info and explanation of what would happen if only the 3-2 downshift solenoid is swapped.
When mentioned a VB swap, I keep forgetting to say that the separator plate needs to be swapped too; thanks for pointing that out again.

 

Thanks for the info. I have a 1995 VB and I can program OBD1. Again, thanks.

 

Do I need to be concerned about the converter? PWM or non PWM.

 

While GM probably made a small change to the lockup friction material when PWM was introduced, I think (correct me if I am wrong) that the difference is very minor and not worth your concern.
UPDATE: Mr Bond disagrees and has much more experience.

If the budget allows, do consider at least an entry level converter from either CircleD or FTI.

 

I may be mistaken but I don’t think you can use a non PWM converter on a PWM trans, unless it has been converted to the on/off apply. The clutch material will not hold up to the slow apply. The PWM converter uses a woven carbon material on its clutch.

 

I defer to Mr Bond's greater experience and have updated my previous thread.

 

Not to gang up on you, Ted, but bbond105 is correct.

GM actually has at least three different linings that they used over the years, but if you use a converter with the woven carbon lining, you'll be good in any case. I typically use woven carbon converters and then delete the PWM in the valve body.

 

Thanks to all. I remember when building cars was much simpler!

 

Glad to be corrected as my goal is technical accuracy. This is also very informative to me and probably others who don't know all the mysteries of converters.