What's the code on the tube? 3.55 would have been the standard gear for a 1970 L78 with 4.10 being optional. I don't think a 3.73 was offered in 1970 Chevelles.
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70 Chevelle Vert L34 M21 28-A 791
70 Chevelle Cpe LS6 M40 14-14 756
70 Chevelle Cpe L?? M?? 926-99616 755
69 Chevelle Cpe L78 M21 71-B 756
70 Chevelle Cpe L34 M20 48-48 796
70 Chevelle Cpe L34 M40 75-75 788
70 El Camino L34 M20 28-C 765
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