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Re: 85 Suburban TH400 to 4L80E swap
when I put an 6.0l/4l80e in my 86 Suburban (originally a 350/th400) I used Dirty Dingo mounts. all I had to do was re-drill the cross member holes in the frame around 1.5" back. but the cross member its self needed no modification. The 4l80e trans bushing bolted right to the cross member.
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