Scrufdog
Pork chop sandwiches
- Joined
- Feb 4, 2014
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The TCC switch is built into the regular brake switch. It has a twin circuit built in. 1 assembly, 2 switches inside.
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Hi all,
'93 GMC 4L60E, with about 2,500 miles on the rebuild.
Recently I've noticed when cold, I'll start going down the road, and it will shift into OD fine, but the converter won't lockup. (running 2000 RPM's at 55, vs. 1700 or so). If I downshift it manually and then back into OD, it will lock up fine, and it works like it should from then on out.
If I let it be, it will stay in 4th (unlocked) regardless of the temp. It's only when I downshift into D and upshift it will shift and lock, and continue to do so.
What gives?
EDIT: I don't know if it does this every time, but I've just noticed it a few times.