tc lock up

[jo4450]

when is the best time to manually lock the converter under normal driving and whens the best time while towing, thanks

[strokin_early_99]

I lock mine when I am in the foothills above 1600rpm when running solo and no one is behind me. If there is someone behind me I keep it around 1900rpm, it is a smoke thing. My injectors flow too much fuel down low and it will smoke three lanes out behind me if I don't watch how low I lug it.

When towing I don't like to force a lock until 2400rpm or so. You need to have enough RPM to spool the turbo so if you lock it too soon the engine lugs and smokes like crazy.

[sirnunya]

does it make your o/d light flash? How much cooler will this keep the trans?

[Motown Fire]

How about driving with a mostly stock truck, normal everyday unloaded driving???

[strokin_early_99]

Yes it will make your OD light flash. With a stock trans I would see over 40* drop in trans temps while towing at lower speeds where the TC would not lock-up.

[sirnunya]

nice. will the flashing light hurt anything or is it more of an eyesore? what is that flashing light supposed to mean

[Black Pwrstroke]

what exactly is a tc lock up

[strokin_early_99]

The flashing light is saying the PCM does not think it should be locked. It will not hurt anything.

The TC lock, locks the TC.