Anyone have a Muncie M21 four speed going spare?

Blondie69

CCCUK Member
Good evening
I'm looking for a donor Muncie M21 four speed. Something in a usable condition but ideally a functional ready to go.
My big block 1969 C3 has eaten the current Muncie 21. I understand they are rare but someone may have one sitting under a bench.
Thank you for your thoughts and ever hopeful ☺️
 

Roscobbc

Moderator
Barb - there are two 4 speed Muncie advertised on Facebook Marketplace. One for Β£999 came on 3 days ago - no mention of whether a M20 or M21 - the other at Β£1400 appears to have come off a SBC powered car so may be a M20. Is yours an M21 like mine?. I think both are a little expensive. The Chodosh's may have an M21 I'll ask Bernie tomorrow for you.
 

Blondie69

CCCUK Member
A better move perhaps to have the existing 'box rebuilt - its a lot of work to fit an unknown quantity gearbox......only to later find that its knackered!
Yes I have a great guy helping me with this. Just need to find a donor now. I bit like finding a unicorn πŸ¦„ 😳 but worth it.
 

Roscobbc

Moderator
When you say 'donor' I presume you mean another gearbox needing re-build. What has happened to your existing gearbox? - is the casing irreprably damaged?
 

Blondie69

CCCUK Member
When you say 'donor' I presume you mean another gearbox needing re-build. What has happened to your existing gearbox? - is the casing irreprably damaged?
It needs a complete gearset change. It looks like the clutch hasn't been clearing properly and its been crunching through the gears and Taken off the synchro teeth. So I am looking at rebuilding the original gearbox if possible.
 

CaptainK

Moderator
+1 to rebuilding the original gearbox. Then you know its a known good quantity, with warranty, and should last you a long time with added benefit you are keeping the car's originality. Getting a second hand "unknown" gearbox is just risking issues later down the line.

That said, if my original 4 speed died in mine, I suspect I'd probably "exaggerate" it a bit more so that my Financial Planner (wife :ROFLMAO:) will allow me to allocate funds to get a 5 speed gearbox into the car :cool:
 

Roscobbc

Moderator
It needs a complete gearset change. It looks like the clutch hasn't been clearing properly and its been crunching through the gears and Taken off the synchro teeth. So I am looking at rebuilding the original gearbox if possible.
Not so many people here in UK who are knowledgable with Muncie variants - who has diagnosed it needs a new gearset?
 

Blondie69

CCCUK Member
+1 to rebuilding the original gearbox. Then you know its a known good quantity, with warranty, and should last you a long time with added benefit you are keeping the car's originality. Getting a second hand "unknown" gearbox is just risking issues later down the line.

That said, if my original 4 speed died in mine, I suspect I'd probably "exaggerate" it a bit more so that my Financial Planner (wife :ROFLMAO:) will allow me to allocate funds to get a 5 speed gearbox into the car :cool:
πŸ˜†.
Not so many people here in UK who are knowledgable with Muncie variants - who has diagnosed it needs a new gearset?
Clive Lansdale in Norfolk. Have you heard of him?
 
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