Author Topic: 69 Muncie Transmission tag (pn?)  (Read 2278 times)

z28z11

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Re: 69 Muncie Transmission tag (pn?)
« Reply #15 on: May 09, 2014, 02:09:21 AM »

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)

Because each different rear end ratio required a different plastic (I think) gear to make the speedometer read correctly.

Actually, the plastic DRIVEN gear was installed at the car assembly plant. What changed was the internal steel DRIVE gear that was pressed on the output shaft at Muncie;

Actually not pressed on, the gear slips over the tail end of the mainshaft and is secured by a spring steel clip. How do I know ? My '69 Z M20 clip broke, lodged in the reverse gear, and jammed the transmission. I made it to the station I worked at, pulled the trans and found the problem. New clip and back in business. Earlier Muncies pressed on -  
« Last Edit: May 09, 2014, 03:15:22 AM by z28z11 »
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

JohnZ

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Re: 69 Muncie Transmission tag (pn?)
« Reply #16 on: May 09, 2014, 05:28:26 PM »

Based on bcmiller's post below, were different PN's used on Muncies based on the *rear end ratio*??  Why would they do that??
(I'm trying to learn my 'Camaro new information for the day'...  :)

Because each different rear end ratio required a different plastic (I think) gear to make the speedometer read correctly.

Actually, the plastic DRIVEN gear was installed at the car assembly plant. What changed was the internal steel DRIVE gear that was pressed on the output shaft at Muncie;

Actually not pressed on, the gear slips over the tail end of the mainshaft and is secured by a spring steel clip. How do I know ? My '69 Z M20 clip broke, lodged in the reverse gear, and jammed the transmission. I made it to the station I worked at, pulled the trans and found the problem. New clip and back in business. Earlier Muncies pressed on - 

Yup - the nylon DRIVE gear and spring steel retainer started in '68.
'69 Z/28
Fathom Green
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