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Topic: M-20 4 Sp

in Forum: C3 Driveline Components


M-20 4 Sp

Posted: 12/21/09 2:52pm Message 1 of 6
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Equinunk, PA - USA
Joined: 10/31/2007
Posts: 2471
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
  Is it possible for me to re-build a m-20 in my basement?  Any special secrets to look for? Any special tools needed?  I have it out.  I got a guesstimate for charges at a local shop, he wants about  $1,000.00.  Need to save for the 2011 gathering. Any suggestions?   THANKS


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M-20 4 Sp

Posted: 12/21/09 4:16pm Message 2 of 6
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Holland Patent, NY - USA
Joined: 6/3/2008
Posts: 4422
Vette(s): #1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Well first of all......is there anything you can't do? I rebuilt a four speed in my 69 cuda years ago, don't remember it being that hard.

Joel will be the judge on this one.................Here come da JudgeBig smile

Evil Smileebo 




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Evil Smileebo

M-20 4 Sp

Posted: 12/21/09 5:00pm Message 3 of 6
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Bloomfield Hills, MI - USA
Joined: 6/29/2008
Posts: 199
Vette(s): 1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt
I rebuilt my BW Super T10 last winter and did a lot of research before doing it. Biggest issue was to press the gears on and off the shafts.
 
You will also need a really good set of clip pliers.
 
 
Good luck



M-20 4 Sp

Posted: 12/21/09 5:24pm Message 4 of 6
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Holland Patent, NY - USA
Joined: 6/3/2008
Posts: 4422
Vette(s): #1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker
Jack, great linkThumbs Up
Thanks, Evil Smileebo




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Evil Smileebo

M-20 4 Sp

Posted: 12/21/09 8:47pm Message 5 of 6
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20218
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
You can do it, Mark!
As mentioned, an good set of snap-ring pliers is a must. A LOT of patience is required to replace the twelve million rollers for the cluster gear. The trick there is to use a lot of assembly lube(Vaseline works great) to get all of them little buggers in there, and then stick the whole thing(cluster gear)) in the freezer for an hour! This will thicken the assembly lube enough to give you time to get it set in the case, align the thrust washers, and slide the countershaft thru the case without all of them dang thing fallin out.
You'll also need a tool to remove the front, input shaft nut...or maybe not. I use a pipe wrench...works just as well as the fancy wrenches they sell.



Joel Adams
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M-20 4 Sp

Posted: 12/22/09 10:48am Message 6 of 6
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Equinunk, PA - USA
Joined: 10/31/2007
Posts: 2471
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
THANKS, I do not have a press, but several hammers! Snap ring pliers abound. Patience is not a problem, no where to go till spring.  Do not have a T-10, but they must all work about the same.  We are going to open it up and see what it looks like, then make a decision.  Clutch is original from what I can tell, a 11 incher with 26 splines. Guess it will take a little more ponies than I have. Oil is REAL clean and the magnet on the plug is clean as well.  Hope the guts are good.  Later, Mark


in Forum: C3 Driveline Components


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