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#1
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Rearend problem in my 41 coupe
Help! I recently purchased a 41 plymouth business coupe. It was already started as a street rod but, needs finishing. My problem is it had a 742 rear in it with 2.73 gears. I bought an 489 case with 3.55 gears and a posi. The problem is now my axles are to long to bolt back in. The guy that sold me the 489 case said to use 29" axles out of a 69 road runner. I bought a pair of used ones out of a 69 road runner. These are to short and will not contact the center to pre-load the bearings. My old axles are 29 13/16" measured from the inside flange to the end. I have no idea what rear end housing is in this car. The guy i got the car from said he thought it was out of a cordoba? Other than cutting and re-splining my old axles does anybody know of any other axles that might fit or to find out what housing i have in the car? Any help is appreciated. Frogskin
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#2
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It would be best to get the entire Road Runner axle and install it in your car. Unless you know the width of the housing in your car, you will only be guessing on the axle length required.Go to http://www.440magnum-network.com/inf...rearaxle.shtml . They list all the dimensions . Dan
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#3
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Sorry, but that website has incorrect information. The correct information is in the archives at the top of this forum.
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#4
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As far as the axles being too long, it sounds like they have green bearings. If you look inside the 742 the 'axle shaft thrust spacer' has most likely been removed.
If you are using green bearings, then just remove the axle shaft thrust spacer from the 489. From Autohobby digest Quote:
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#5
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Double check some measurements of the housing and compare them to the info in the tech archives. Maybe you can i d the housing and then get axles.
Could be a thrust block issue also. There is also a guy on moparts named "Doctor Diff" who is extremely knowlegable in this area. Maybe go over there and send him a pm. His real name is Cass. |
#6
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Quote:
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#7
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How much
to long are they? You have extra room on the splined end to trim some off if its not to much. How about your adjuster? is it screwed all the way in? that would make your axles seem to long.
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#8
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Quote:
Also, the correct way to measure axle length is from the outside of the flange to the splined tip of the axle shaft. Quote:
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#9
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I don't recall stating how to measure axle shafts. After spending over 30 years of my life working at Chrysler Engineering, I wouldn't believe anything someone quotes from a he said she said paper or magazine article. I have actual prints of parts that were made for production that most people have never seen or heard of. Yet they were still put in a certain few cars. For example have you ever seen or heard of a four bolt main 413 Max Wedge? Four bolt main 440 Six Pac? 413 V8 Diesel? 1973 "A" Body 8 3/4" 4.5" bolt circle axle shaft? PN 3507885 (Lenght 27.42"-27.44") Oh well, could argue all day about who is right. Bye. Dan
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#10
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Quote:
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#11
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Quote:
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#12
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Quote:
"My old axles are 29 13/16" measured from the inside flange to the end." You can't compare printed data, right or wrong, unless the method of measurement is consistent. Mopar axles are measured from the outside of the flange. Quote:
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