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General Mopar Tech Discussions

  1. Mark Barnes

    Mark Barnes Well-Known Member

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    Bought a Belvedere ll sight unseen. Haven't gotten my hands on it yet. Has an original 273/904 in it.
    First question is, did these cars come with 8-3/4 rear ends, or something smaller?
    Second question- does the 8-3/4 reference just the ring gear size, and if so, are the diff./axle housings the same for all gear sizes? I remember back in the day my buddies would pull the axles and remove the entire frontloader. The "pig", as they used to call it. Guess I should have paid more attention.....1
     
  2. VANDAN

    VANDAN FBBO Gold Member FBBO Gold Member

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    Your car should have an 8-3/4 rear end, if it is original to the car, '67 Belvedere ? You will be able to change out the "pig" to another gear ratio, if looking to. The axle housings themselves, came in different widths, to accommodate the particular year & model they were installed in, at the Factory...
     
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    • beanhead

      beanhead Well-Known Member

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      Well I can't say for sure if your model would have had an 8-3/4 as standard equipment, but yessir that is the ring gear size. 8-3/4 housings and axle splines are all the same; except the length(or width?) varied depending on car model. 3rd member/carrier/(pig/chunk/pumpkin lol)came in 3 different series, identified by the last 3 digits of the big number cast into the side of it. The 741(low-HP/torque applications) used the smaller yoke and pinion, 742 and 489 were the bigger (and more desirable) series. 742 is generally from 1968-down while the 489 is 1969-up, though there was some overlap there. Generally you use parts for your specific series of carrier, although any carrier can be put into any housing. Just have to match the rear U-joint with the pinion yoke size.
       
      Last edited: Mar 27, 2020
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      • kramer

        kramer Active Member

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        Pretty much all v8 B bodies 68 and older had the 8 3/4 except for the 440 and Hemi 4 speed cars with the Dana 60's. The 8 3/4 does refer to the ring gear size. I believe most of the 8 3/4 center sections were interchangable all the way up to 1974, the last year of the axle.
         
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        • Demonic

          Demonic Well-Known Member

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          I've seen them with baby rears - the 7 1/4. Hopefully you have the 8 3/4.
           
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          • Darter6

            Darter6 FBBO Gold Member FBBO Gold Member

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            Had a 69 and a 70 that came with a 8 1/4 '' too. But I'm pretty sure that a 67 would have a 8 3/4''.:xscuseless:That way we can tell for sure.By the way Hi Mark ! Thanks for joining up.
             
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            • rolling_Thunder

              rolling_Thunder Well-Known Member

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              According to the dealership date book (from Hamtrack Historical) 6 cylinders got the 7 1/4, all V-8s for the 8 3/4 except the manual trans Hemi and 440 cars with the Dana

              67_Belvedere_features_options0015.jpg
               
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              • YY1

                YY1 Well-Known Member

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                nearly all 1966 B body cars except 6 cyl that I've seen came with an 8 3/4

                for 67, I've seen some 273 and 318 cars come with a 7 1/4
                 
              • Mark Barnes

                Mark Barnes Well-Known Member

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                That's what I was hoping for! As soon as the car shows up Monday/Tuesday, I'll send pics. Thanks!
                 
              • Mark Barnes

                Mark Barnes Well-Known Member

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                My luck...whatever the good one is, I'll get the OTHER one.
                 
              • beanhead

                beanhead Well-Known Member

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                If there's no cover bolted on the back side, you gotcha an 8-3/4. If it is, look at the big casting number on the driver's side behind the yoke and let us know what the last three numbers are.
                 
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                • Mark Barnes

                  Mark Barnes Well-Known Member

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                  Car is not in my possession yet. As soon as it shows up from CA, I will send pics.
                   
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                  • beanhead

                    beanhead Well-Known Member

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                    Oh! Cool. The anticipation would drive me nuts (short drive some say...)
                     
                  • 440 4 speed

                    440 4 speed Well-Known Member

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                    I have a 67 Charger body, rusty, originally from Illinois. It had A/C, 318, 2 core 26 inch rad, that I have, console car, and a 71/4 differential.
                     
                  • WP29440SE

                    WP29440SE Well-Known Member

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                    blowing spider gears with a 7 1/4 in an A body is bad enough. I imagine they didn't last long in a B body. I've seen many with an 8 1/4 which seemed to be the norm with the small blocks.
                     
                  • YY1

                    YY1 Well-Known Member

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                    8 1/4 was not available in 66/67
                     
                  • 440 4 speed

                    440 4 speed Well-Known Member

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                    YY1 You are correct .
                     
                  • Mark Barnes

                    Mark Barnes Well-Known Member

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                    Ok, so the car finally showed up. Here's a picture of the rear end serial number...and a couple more. I have low standards, but I'm pretty happy. My son is amazed...it was worth 10 times the price to see him get excited about building this car.
                    Anyone that can tell me any of the history of this vehicle, I'd appreciate it. I have no idea what all the identification numbers mean....

                    20200330_164804.jpg 20200330_162843.jpg 20200330_162853.jpg 20200330_165432.jpg 20200330_165439.jpg 20200330_165053.jpg 20200330_162726.jpg 20200330_162713.jpg 20200330_165529.jpg 20200330_165601.jpg
                     
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                    • YY1

                      YY1 Well-Known Member

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                      That looks like a 741 case 8 3/4 which is date correct.

                      My guess is a 2.94 gear.

                      I LOVE that color.

                      The best resource for 66/67 fender tag decoding while not complete is the 66/67 Charger site.

                      I don't have the link handy, but it's been posted here several times.
                       
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                      • 440 4 speed

                        440 4 speed Well-Known Member

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                        RH41 Belvedere 4 door sedan Premium upholstery
                        31- 273 2 barrel V8
                        5- auto
                        335- should be 5 -7.00x14 black 4-4 steel belted police tires
                        831- August 31 built
                        Shipping order number
                        Line 2.
                        A/2- 2.76 ratio axle(great economy)
                        TRM/H1Q-high quality, cloth vinyl bench,
                        turquoise
                        PNT/KK1-medium turquoise metallic
                        UBS/L- Dark uppercut door frame paint
                        Row 5
                        E/1- cleaner air package
                        X/2-tinted glass windshield only
                        6&7 row
                        -h/7-fender mounted turn signals
                        -m/3-mouldings -deck lid release knob
                        I don’t see a code for the radio. Also the 741 on the center section is a small pinion.
                         
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