Stamping numbers on Muncie 4-speed gearbox

[Vincent McGrath]

I have a 1967 Corvette with a Muncie 4-speed gearbox that has 3925660 cast on the case on the passenger side of the car. There is also the number 8 cast in low relief on the same side of the case below and in front of the above seven digits.

I am led to believe the gearbox is a replacement but I cannot decipher the stamping which runs in a vertical fashion down the gearbox case near where the flange meets the extension housing. This stamp is also on the passenger side. The stamp is CT9 followed by a space of an inch and then the stamped numbers 41945. This is certainly not my Vin sequence.

As well, on the other side of the gearbox, bolted to the side cover, is a soft metal tag with the numbers 3877459 stamped on it.

I would be eternally grateful if an expert out there can help me with these stamping secrets as I cannot get anyone here in Australia to shed light on this. Thank you.

[Larry Barickman]

Re: Stamping numbers on Muncie 4-speed gearbox

Check out www.5speeds.com lots of info on muncies

[Tom P.]

Re: Stamping numbers on Muncie 4-speed gearbox

Vincent,
The 3925660 is the casting number for a Muncie case of the 68-69 variety (from 63-74 there were 5 different casting numbers). The small tag on the side cover is the part number which was assigned to that configuration of Muncie when assembled.
Go look again. Look on the same side where those other numbers are stamped. There should be a stamped code which begins with a P. Those other numbers most likely corrospond to the VIN of the vehicle feom which it came out of.
Are you SURE that CT9 is not OT9? And, is there a P in front of the CT9 (OT9)?
The reason that I ask, is because that MAY be the date code.

[Wayne M.]

Re: Stamping numbers on Muncie 4-speed gearbox

Vincent -- sounds like a warranty replacement transmission; believe others in the past have stated that the CT9 XXXX means Chevrolet Trans (1969) and the XXXX is just the sequence # of transmission. This is the same system as warranty replacement engines, eg. CE2XXXX (Chevrolet Engine (1972). Look for the "P"ddmm number that Tom describes. The number "8" is probably just the casting mould number. I've seen them range from 1 to 10 on Muncie cases.

[Vincent Mcgrath]

Re: Stamping numbers on Muncie 4-speed gearbox

Wayne - Thanks a million for your comments. It is great to know help is out there. Cheers, Vincent

[Vincent Mcgrath]

Re: Stamping numbers on Muncie 4-speed gearbox

Tom - I will have a better look to see if in fact there are are other numbers cast into the case. Thanks very much for your considered advice. Cheers, Vincent

[Vincent Mcgrath]

Re: Stamping numbers on Muncie 4-speed gearbox

Larry - I have looked up the 5 speed web site and found a heap of interesting information on codes, stampings etc. Great stuff. Thank you. Cheers, Vincent