I’m hoping someone can help with Muncie identification. The car currently has a Saginaw in it, and that obviously has to go, so we’re going to have to start hunting for a Muncie. We’re trying to determine the correct casting numbers to look for to buy a Muncie M-20, which was the original trans for our 1969 GTO.
What would be the correct casting numbers? My research says we should have the following, based on info from Muncie 4 Speed Transmissions
Case 3925660 (1968-1970, I'm pretty confident this is correct)
Tailhousing 3846429 (1963-1965 Regular thick web, driver speedo, 27 spline per above source - VERY unsure if this is the tailhousing we need)
OR 3857584 (1966-1970, non-Pontiac?)
Side Cover 3884685 (or 3950306?)
From what I understand (which is limited, for sure!), the 3884685 cover has studs for the shifter arms, while the 3950306 cover uses bolts to mount the shifter arms. I have not been able to determine what triggered the use of either one, nor which is correct for a ’69 GTO.
Also, the speedometer mounts on the driver side, correct? The assembly manual seems to show it mounting to the driver’s side of the tranny, which then points to the 3846429 tailhousing, but all info I can find says that p/n was only used up till 1965. I’M CONFUSED! :confused Most Muncies I see for sale have the 3857584 tailhousing, but the speedo mounts on the passenger side with that extension.
I’ve looked through the 1969 Pontiac Service Manual, as well as the ’64-72 GTO Restoration Guide and Assembly manual, but I can’t find this info anywhere.
Can anyone help clear this up? Thanks.
What would be the correct casting numbers? My research says we should have the following, based on info from Muncie 4 Speed Transmissions
Case 3925660 (1968-1970, I'm pretty confident this is correct)
Tailhousing 3846429 (1963-1965 Regular thick web, driver speedo, 27 spline per above source - VERY unsure if this is the tailhousing we need)
OR 3857584 (1966-1970, non-Pontiac?)
Side Cover 3884685 (or 3950306?)
From what I understand (which is limited, for sure!), the 3884685 cover has studs for the shifter arms, while the 3950306 cover uses bolts to mount the shifter arms. I have not been able to determine what triggered the use of either one, nor which is correct for a ’69 GTO.
Also, the speedometer mounts on the driver side, correct? The assembly manual seems to show it mounting to the driver’s side of the tranny, which then points to the 3846429 tailhousing, but all info I can find says that p/n was only used up till 1965. I’M CONFUSED! :confused Most Muncies I see for sale have the 3857584 tailhousing, but the speedo mounts on the passenger side with that extension.
I’ve looked through the 1969 Pontiac Service Manual, as well as the ’64-72 GTO Restoration Guide and Assembly manual, but I can’t find this info anywhere.
Can anyone help clear this up? Thanks.