tc lock question
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Elder User
Joined: May 2007
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From: North East, MD
tc lock question
Just did tc lock mod and love it but have a few questions. When is it safe to lock? Will it cause damage locking to slow speed (rpm or mph) or will it just dog the engine?
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
Well, I wait till about 35 MPH to Lock the TC, and if speed drops below 30ish I unlock. If you have a newer PCM, TDE1, the PCM will do this already, as I found out going from a NAW6 to the newer code. But 35+ lock and 30ish unlock. I'm sure others will chime in too
-Robb
-Robb
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Elder User
Joined: May 2007
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From: North East, MD
The pcm want to unlock below 25. I've been cutting off at 20 and kick it sometime after 20 depending on conditions. I've heard that locking it at too low of speed is bad because of line pressure or something
Logistics Pro
Joined: Oct 2004
Posts: 4,738
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From: FL
Originally Posted by MADVAN
The only real time you have to keep and eye out is with the use of the EBPV as a brake.
I thought most have an auto trans for what it is an auto.
It should do what is needed by itself!
Bill
I thought most have an auto trans for what it is an auto.
It should do what is needed by itself!
Bill
-Robb
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
The pump doesn't have enough output below about 1300 RPM to be sure that the torque converter clutch won't slip. If you try to lock below that speed you run the risk of slipping the clutch, which will damage it.
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Elder User
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From: North East, MD
Trending Topics
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
If you have your T/C locked when you try and stop, the truck will stall. Just like trying to stop w/ car in gear and clutch not pushed in
-Robb
-Robb
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