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#1
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I was able to document many unique things that helps verify the car such as:
Frame Stamped Twice with Vin Seq ![]() Rear End Date Code, and Stamping from May of 66 ![]() ![]() Harrison Radiator with Date code on the upper tank of D(sorry no picture) and code UN and Lower Tank BP. Side Straps are Dated C(March) ![]() ![]() ![]() Seems little has been known why GM had a separate tag for the M20 with L78. I think I found why. 2 things that made the L78 muncie M20 different than the regular M20 Stiffer side cover dentent spring, muck like you would see in an M21 or M22 ![]() In the following 2 pictures notice the gears are painted differently from the factory(when I cracked the side cover I was like why!?) ![]() ![]() I got the slider out and found out why. GM put an M21 slider with the locking groves for 4th gear in the M20 with High performance engine ![]() Trans vin Stamp. Appears to be stamped off line after the car was assembled ![]() Well I hope everyone can enjoy my story and learn as I have. Full Restoration to start later this year! Already have another NOM and plan to have this car back to better than new with a High End restoration |
The Following 3 Users Say Thank You to OneStopRestoration For This Useful Post: | ||
#2
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Great story! Did all 1966 & 1967 High Horse SS-396 Chevelles come with the finger guard on the top tank? My original 1967 SS-396 / M-20 Coupe had the guard on it when I bought it but I thought someone put a GTO or 442 radiator in it prior to me buying it. Keep us posted on your progress.
Bill |
#3
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<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: OneStopRestoration</div><div class="ubbcode-body">
I got the slider out and found out why. GM put an M21 slider with the locking groves for 4th gear in the M20 with High performance engine ![]() </div></div> Are you saying this slider was normally only used with hi-perf close ratio M21/M22 transmissions? I thought the locking feature was relatively common on ALL Muncies from the era. |
The Following User Says Thank You to novadude For This Useful Post: | ||
67 Nova Boy (07-22-2023) |
#4
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Novadude, My dad is restoring a low miles 67 Chevelle SS that came with an M21. In taking that trans apart we found the same torque locking slider for the 3/4 gear set. We know that cars history back through 2 previous owners, neither of which touched the transmission since new. It had been a mystery to me why GM pulled a speacial part number M20 separate from the 325 or 360hp cars. It became clear in finding the same torque locking slider in my 66 L78 M20. I cant speak to the M22s of the era. Its funny so many people probably never have checked or just toss the originals in the trash during a rebuild. Like i stated this is my theory but I believe its good evidence to represent an additional distinguishing difference.
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