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A friend is trying to sell a rebuilt muncie 4 speed. He was told it was from a 1968 vette. It is fresh and was built by a reputable builder. It is missing the front bearing retainer. Here are the numbers off of it which I believe I decoded correctly. I have a 3925660 case number and also P8E?4B. The casting number would put it in the right time to be a 68. THe other number I decode as Muncie, 1968, September, ?4, M-21. I also have a tailhousing number 3857584. He has it as a back-up for his big block Nova. He decided to go with a turbo 400 set-up and would like to get this out of his garage. What would the fair market value be? Thanks.
Buying a 40 year old tranny (or car), sight unseen, is dicey. I'd buy from somebody who could provide some sort guarantee. Yeah, you'll pay more, but you won't end up with a box of rocks.
The biggest problem with the ol' Muncies was that the main housing would stretch,..caused by the angle of the gears and lotso torque. This mis-alignment causes parts to fail. I'm not sure a "stretched" box can be re-used,..but Autogear makes a beefier replacement,..in fact, they can sell you a Muncie for about $2000 that's much stronger than the originals and they provide good choice of ratios.
I was at a swap meet in February and there were a dozen rebuilt Muncie's with asking prices between $600 for M20's & up to $1200 for M21's.
One of the reasons I stopped doing rebuilds is this very reason. I started doing shows back in 1986. At the time on the east coast anyway there were a handful of guys doing full rebuilds. After 8 years I noticed an increase in people selling "rebuilt units". The pricing varied so much, it confused people since you'd have an $800 unit with used parts and maybe with a new front bearing, resealed selling against a fully rebuild unit maybe for $475.00! Then a totally used one for $500, etc...
My philosophy has been that unless you are looking for some matching numbers stuff, with the price of new units only on an average $800 more than something rebuilt or used why bother? The average component life in a Muncie hits 35 to 40 years old now. Most cases are stretched and leak.