Lockup characteristics of PYE 4000
 

Is it true that this converter only locks up under a targeted torque load in non-overdrive gears?
When my switch is turned on, it only locks up fourth, at least that is the only gear I can see and hear a significant drop in RPM, 400-500.

Re: Lockup characteristics of PYE 4000
 

Below the targeted torque level, the converter behaves like any other converter with regard to lock-up.

Re: Lockup characteristics of PYE 4000
 

So it will lock itself automatically, with or without the switch, as long as targeted torque is reached?

Re: Lockup characteristics of PYE 4000
 

yes

Re: Lockup characteristics of PYE 4000
 

Make sure your manual switch is setup properly. The 4L70 will lock in fourth automatically. If you are not getting lockup in 3rd you have a problem with your switch. Check the power lead to the switch and make sure you use 3rd gear lockup at the track only.
Cheers,
Chris

Re: Lockup characteristics of PYE 4000
 

Thanks Chris for the response. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
I can already tell my probation period has begun in here. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />