69 Chevelle L78 Buildsheet opinions - Page 2

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**Mr70** · #11 10-10-2007, 07:46 PM

Any one of 5 different rear axle ratios were available when
the L-78 engine was ordered in a 1969 Chevelle Super Sport.
These varied depending on the transmission ordered:

<u>Manual-Auto.</u>
3:55---3:31/Standard-available w/or w/o Posi
3:31---3:07/Economy-available w/or w/o Posi (Posi excludes 3:07)
3:73---3:55/Performance-available w/or w/o Posi (3:73 only as Posi)
3:07 or 4:10---3:73 or 4:10/Special all Posi (excluding 3:07)

**mockingbird812** · #12 10-10-2007, 07:49 PM

Rick - can you infer what the rear ratio is on this Chevelle given that the buyer selected an M21? I would say 3.55 but with the M21 selection, would it be another ratio?

**Mr70** · #13 10-10-2007, 07:51 PM

Box 29 shows a KF prefix,which is a 3:55 Posi.
The M-20/M-21/M-22 were all available with all 5 ratios listed.
The Turbo-Hydramatic400 was the only Auto.Trans available with those listed.

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