spinz71

iTrader: (1)

I did a search but couldn't find what I was looking for so here goes....

1) When in Drive and at a complete stop, is the TC locked or unlocked?

2) On a Vac. Mod 4L60E, what controls the TC lock up?

TIA and happy holidays!

1989k1500

iTrader: (23)

The tc is unlocked when your stopped.

95ImpSS

iTrader: (2)

1. When stopped (or pushing the brake pedal), the TC is unlocked.

2. TC lockup is controlled by the TCC lockup solenoid. The 46-MOD (for the 4L60E) replaces the pressure control solenoid (different from the lockup solenoid).

spinz71

iTrader: (1)

Thanks guys.....some more questions then. Supposing the TC were locked when stopped, what would the symptoms be or how would you know?

joshua022

iTrader: (12)

It would be overheating.

Spoolin

iTrader: (8)

Your car would stall and die. Same as having a stick in gear at a stop light.

spinz71

iTrader: (1)

Thanks again for the replies. More questions in my quest for knowledge...

Does the TPS play a part in shifting? If so, what?

Does the VSS play a part in shifting? If so, what?

spinz71

iTrader: (1)

Thanks Spoolin.....what would happen if the truck were stopped and in second gear?

Bill Reid

iTrader: (14)

You can pick up an ATSG manual (with supplement) on ebay for dirt cheap. In that manual it goes through just about every conceivable scenario on troubleshooting. It also shows you how to do a basic rebuild... including recommended specialized tools.

Bill

95ImpSS

iTrader: (2)

1. TPS output tells PCM helps PCM determine what gear to engage based on forward speed and throttle position.

2. VSS provides the actual speed to help determine which gear to shift in.


Take Bill's advice on acquiring an ATSG manual, or PM me. Maybe we could work something out. Not that anyone doesn't want to answer questions, but the manual is actually a great learning tool for basic transmission operations & troubleshooting. You can get e-copies of those online for ~$35+ each.