Trans crossmember ID help

EddieS · May 20, 2025

This trans crossmember came in a box of parts when I bought my truck. I see conflicting Info on ebay listings as to what it actually fits. Looks like it's a B body for sure. But I've seen varying info to what year and if it's automatic, 4 speed, or both. It looks like it may have never been installed. Or its amlow mileage take-out. The stamping on bottom is MK 48 3

Cop car wagon · May 20, 2025

66-69 B automatic

EddieS · May 20, 2025

Cop car wagon said:
66-69 B automatic

Thanks! I had seen virtually identical ones on ebay that said it fits cars like you describe, and also 70 (1 year only) 4speed cars. So i didn't know exactly what it fit.

R/T Boy 67 · May 20, 2025

The 1970 version .looks the same but has smaller mounting holes. The four speed had the mount relocated in 1970, so that it used the same crossmember as the automatic.

EddieS · May 20, 2025

So what size are the holes for each fitment? Should I check, or is it 100% a 66-69 automatic crossmember?

R/T Boy 67 · May 21, 2025

The 66-69 uses 1/2" through bolts, and the 70 uses 3/8". They are identical otherwise.

Trans crossmember ID help

EddieS

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Cop car wagon

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EddieS

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R/T Boy 67

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EddieS

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R/T Boy 67

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