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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2016
Posts: 94 |
anyone know what ratio 1940 chev car rear axle is? will it fit under a 38 sedan ??
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
It could be a 3.73 if from a Master 85 or a 4.11 if a Master deluxe or Special Deluxe. The Master 85 was the least common of the bunch.
Gene Schneider
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Joined: Jul 2005
Posts: 3,192 Likes: 8
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Jul 2005
Posts: 3,192 Likes: 8 |
The 1940 rear axle and torque tube assembly will not direct swap into a 1938 as the front of the drive shaft has a different spline count, 17 for 1940 compared to 10 for 1937 to 1939
JACK
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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2016
Posts: 94 |
Tnx for the info,just got a 3:73 put in MD 1938 sedan ..what a PIA ..have not got it ready to try yet ..sc
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Joined: Sep 2002
Posts: 2,323 Likes: 6
ChatMaster - 2,000
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ChatMaster - 2,000
Joined: Sep 2002
Posts: 2,323 Likes: 6 |
Bigpine, so what was bad about installing the 3.73? Some of us would be interested in that information.
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .
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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2016
Posts: 94 |
OK here's my take on rear axle swap..car 38 MD 2dr sdn with 4:22 rear..bot a damaged 38 3:73 but got it repaired..so in it went..put 2 sets of jack stands under frame just ahead of spring perch, remove axles by removing set screw on ring gear cage remove 4" long pin and block,remove U washers one on each axle,pull out axles about one foot,next problem removing u-joint bell it is locked in by emerg brake cross shaft,had to remove trans mounting nuts and jack up engine and pry it off great planning by GM folks.next unhook emerg brake rods fairly easy.but must loosen brake cable support WD40 and vise grip them and pushing them back to rear,if you don't can't get rear axle to the back far enough.next remove 8 large nuts on spring shackles remove spring shackles,next disconnect brake line,need to bleed brakes when put back on..remove rear cover on banjo and drain..then remove front banjo nuts about 10 or so..next pry with big bar to slide entire axle back about 6 in. and remove front bell but not u-joint except if you want to replace it..I chose not to it seemed in good shape but I did have a new on hand..next with 2 people slide screw driver in front of banjo and pry off entire torque tube,it helps a lot to keep rear axle from rotating as you try to get old stinger off..clean as needed... pitch old tube in the ditch..clean the new replacement tube and gear set... to not take this apart as you will loose the gear setup...put 3:73 tube up and fight to get it in but not to bad of a job..took 2 days and a lot of swearing and lots of dirt and grease in hair and arms..might add putting rear shackles back on is not easy another great GM idea best to tighten front , put car weight back on axle and pound them on..I do not ever want to do this again..drove car today on freeway about 60 or so, big improvement over 4:22 car seemed to ride better as far as wheel hop and shimmy goes.sc PS remove nuts to rear shocks also my shocks still worked fairly good after 80 years
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Joined: Aug 2016
Posts: 94
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Aug 2016
Posts: 94 |
Mistake on above text on rear axle change out....when I say spring shackle I mean spring U bolt,spring shackles are never in play except when one flips which it did for me because of improper jacking under rear shackles..sc
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Remember your speedometer is now 10 percent slow. When the speedo. is showing 60 MPH you are actually going 66 MPH.
Gene Schneider
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