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E-body 8.75 case, which is correct 489, 742 or 741??? #552150
12/12/09 05:56 PM 12/12/09 05:56 PM
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What would be the correct 8.75 case for a 1970 Challenger, 489, 742 or 741?

1# Challenger 383-4, SPD early January 1970, gears 3.23+SG
2# Challenger 383-2, SPD late October 1969, gears 2.76, no SG

Both are original 383 cars, and have broadcast sheet, but it doesn't tell anything about the center section what was used?

1970 Challenger R/T 383
1970 Challenger Convertible 383
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: ebodiesonly] #552151
12/12/09 06:40 PM 12/12/09 06:40 PM
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From the 70-71 Factory Parts Book.
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Snoopy] #552152
12/12/09 07:48 PM 12/12/09 07:48 PM
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Snoopy check out axle assy # 100 in Galen's white book...I owned one..I was shocked to see it but...
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: 1_WILD_RT] #552153
12/12/09 10:09 PM 12/12/09 10:09 PM
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The info I listed has the 741 listed above the 489, but they don't brag about it fitting E-Bodies. That doesn't mean there aren't any 70 E-Bodies with 741 center sections.
If you hadn't had one, I would not have believed Galen's book.
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Snoopy] #552154
12/12/09 10:20 PM 12/12/09 10:20 PM
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Strange thing is it was in my R/T vert, no broadcast sheet but date code matched every other major part... I fixed it, it has a 489 with a S/G now..

Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: ebodiesonly] #552155
12/12/09 10:22 PM 12/12/09 10:22 PM
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Quote:

Both are original 383 cars, and have broadcast sheet, but it doesn't tell anything about the center section what was used?



Actually, it does, kind of.

Look on line 4 of your broadcast sheets. Note the numbers in the boxes marked 'Axle' then compare those numbers to the B.C. part number on the chart at this link;

http://www.hamtramck-historical.com/images/TSBs/1970/D70-3-2%20page4.jpg
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Alaskan_TA] #552156
12/12/09 10:27 PM 12/12/09 10:27 PM
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Barry the last two axles listed are 8.75 & they show the filler being in the cover... Might wanna fix that...
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: 1_WILD_RT] #552157
12/12/09 10:32 PM 12/12/09 10:32 PM
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To me the 'cover' on an 8 3/4" is the dropout section.

It is a factory TSB, so while they are not always 100% correct, it is not something I can really edit either.
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Alaskan_TA] #552158
12/12/09 10:37 PM 12/12/09 10:37 PM
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I just found a broadcast sheet for a 70 383 Cuda with a 741 carrier. SPD 423.
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Alaskan_TA] #552159
12/12/09 10:38 PM 12/12/09 10:38 PM
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Well if you can't edit it then it stays... But if you look there are other 8.75's listed & they show the filler in the carrier of those...

Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Snoopy] #552160
12/12/09 10:44 PM 12/12/09 10:44 PM
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Quote:

I just found a broadcast sheet for a 70 383 Cuda with a 741 carrier. SPD 423.




Mine has a SPD of A19 but the assembly date of the engine is 10-29, the 3rd member assy date is 10-28 & the axle assy date is 10-29... Obviously it didn't meet the SPD...
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: 1_WILD_RT] #552161
12/12/09 10:49 PM 12/12/09 10:49 PM
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I know, but most folk know where the fill is on one.

A lot of cars did not meet their SPD. My T/A engine is dated after it's SPD too. It is pretty common, some were early, some were late.
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Alaskan_TA] #552162
12/13/09 08:52 AM 12/13/09 08:52 AM
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My 71 challenger with 383-4 has 017 on the broadcast sheet, but I don't se it listed. It has 489 on the case and 3.23 gears.

5664495-housing.jpg (188 downloads)
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: ebodiesonly] #552163
12/13/09 11:02 AM 12/13/09 11:02 AM
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Cool Thread



Tav
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: noschevys] #552164
12/13/09 12:10 PM 12/13/09 12:10 PM
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Quote:

My 71 challenger with 383-4 has 017 on the broadcast sheet, but I don't se it listed. It has 489 on the case and 3.23 gears.



1971 rear axles were covered here: '71 cars w/discs & 11" rear drums
Re: E-body 8.75 case, which is correct 489, 742 or 741??? [Re: Alaskan_TA] #552165
12/19/09 02:42 PM 12/19/09 02:42 PM
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Quote:

Quote:

Both are original 383 cars, and have broadcast sheet, but it doesn't tell anything about the center section what was used?



Actually, it does, kind of.

Look on line 4 of your broadcast sheets. Note the numbers in the boxes marked 'Axle' then compare those numbers to the B.C. part number on the chart at this link;

http://www.hamtramck-historical.com/images/TSBs/1970/D70-3-2%20page4.jpg




THANKS a lot Barry for this information.

Looking at the TSB link gives answers:

1# 489
2# 741

I was a big surprice for me that althougt the car 2# is original 383, it has 741 case.

It looks like the gear ratio 2.76 was the reason for 741. Any good guess for this?

If the gear ratio would had been 3.23, then it would had used 489?

1970 Challenger R/T 383
1970 Challenger Convertible 383

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