Wasson

iTrader: (1)

I am in process of installing a 2004 LS1 (GTO) motor and auto tranny into a 69 Firebird. I used the TCI front subframe kit, which went together well and bolted right on.

Can someone who has done the LS and automatic into a first gen F body let me know if they has issues with the tranny hitting the floor/tunnel? If so, any specific advice?

Thanks.

rsz288

4L65E fitted ok but was tight. Then I changed to a 6L90. That needed some clearancing at the top of the tunnel, and a little at the rear. Its tall.

4L65E actually wider at the pan than the 6L90.

69LT1Bird

iTrader: (1)

I had to massage the floor so the servo would not hit, it depends on the mods. 4L60e here.
Other than that, no issues.