5.3 to 4l60e... Advice needed!

[kjdolphins]

Purchased a 2004 5.3 to throw in my 72 c10. Found a 4l60e, but it's out of a 1994 vehicle (so I was told)... Is there anything extra needed to pair these up? The guy we bought the tranny from also gave us an extra flywheel he said we'd need...

[scottybaccus]

You will need a converter for the 2004 model, and the flex plate should look like a flower, dished in the center, by 10mm.

[akdg87]

issue is that the 1994 4l60e is non pwm (pulse width modulation) TCC lockup, so you cannot put a PWM converter in (Such as the 2004 mentioned above).

The trans will work, if you tune the lockup settings correctly for on and off and not a percentage of lockup.

Also you need the 4l80e flex plate with spacer, or the cheaper alternative is that Hughes sells a spacer for the torque converter nose and you will have to oblong out the holes on the stock 5.3 flexplate to accept the older convertor bolt pattern.

[clinebarger]

The 3-2 downshift Solenoid & Valving is also an issue.

'93-'95 3-2 Solenoid is controlled via PWM & the 3-2 Valve is isolated from the Solenoid.

'96-'08 3-2 Solenoid is controlled via On/Off, The 3-2 Valve is actuated directly.

I would advise against using '93/'94/'95 4L60E's, You may get the TCC control ironed out with a custom tune, But custom 3-2 PWM tables that works right may be tricky.

All that to run a 21 year old 4L60E core of unknown origin? Get a correct 300MM 4L60E for a LS & have it rebuilt.