396 - 4-spd muncie - Team Camaro Tech
Engine General Engine Discussion.

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post #1 of 4 (permalink) Old Sep 2nd, 03, 06:29 PM Thread Starter
Join Date: Aug 2003
Location: Iowa
Posts: 8
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so Im gettin my tranny rebuilt its a muncie m-20 4-spd so what could I do or what shouldd I have done to it to be able to withstand a 396 big block? and what do I have to do to get it to bolt up ????? am I in over my head

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post #2 of 4 (permalink) Old Sep 3rd, 03, 10:04 AM
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Join Date: Jan 2001
Location: Raleigh, NC
Posts: 1,046

Unless you have seriously massaged your engine or just plain plan to get into it every chance you get, you will get by with the basic rebuild kit ( seals, syncro, bearings, etc .. ) M20 are pretty good trannys... You talk about bolt up ... Is this a engine swap or tranny swap ? Tranny has to bolt to bell housing ... and you need to count the splines on input shaft for clutch and on output shaft for yolk ( if this is a tranny swap ) ... Check flywheel and pilot bushing...

Also, you can go to www.chevelles.com and post for Wally .. he moderates the tranny section .... or go to his website at
www.muncie4speed.com for help
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post #3 of 4 (permalink) Old Sep 4th, 03, 02:56 AM
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Join Date: Apr 2001
Location: Southern NH
Posts: 1,052

Make sure you get quality parts.I run a 350/330 ho motor and 4.10 gears. After getting a rebuild kit from a local auto parts store and having it professionally rebuilt I lasted 350 miles before the front bearing let go and took out the case bell housing input shaft etc. All we saved was the output shaft reverse second and 3rd gear. A rather expensive time. I bought my next parts from a reputable internet supplier along with a steel mid plate.Good Luck.
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post #4 of 4 (permalink) Old Sep 5th, 03, 07:14 AM
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Join Date: Oct 2000
Location: Indianapolis, IN USA
Posts: 71

If you need gears, use the Italian gears.... They cost more, but they are well worth the cost of the cheap one's.
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