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Muncien tunnistus
Huvikseni selailin nettiä, ja huomasin että laatikon tunnistaminen M-20 vs M-21/22 on aika monelle ongelma. Löysin tuollaisen tekstin jossa on hyvät tunnistusohjeet. Mutta siinäkin lopuksi sanotaan, ei nuo olekkaan varmoja tunnistuskeinoja. Siis mistä sen oikeasti eroittaa muuten kuin avaamalla ja laskemalla rattaiden hampaat.
MODEL IDENTIFICATION(1969-1972)
A-M20
B-M21
C-M22
Note: not always stamped
Originally, identifying the transmissions by external markings was simple. The M20(wide ratio) trans. had two grooves cut into the 10-spline input shaft and no fill plug in the case, while the M21(close ratio) had a single groove on the 10-spline input shaft and no fill plug on the case. The M22 had no grooves on the input shaft and was the only transmission to be equipped with a drain and fill plug. Unfortunately, over the years, replacement cases and gears offered by Chevrolet and aftermarket manufacturers did not follow the G.M. assembly line identification system, so trying to use this method to identify a transmission is almost impossible.
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