Re: Correct 62 8 3/4 Rear End

[<62-65-mail-list-club@xxxxxxxxxxx>]

A 741 is a correct stock item in 1962. 

Replace? Maybe not. Below is another perspective, from Don D., former member here.

Gary H. 

>  -------Original Message-------
The 741 gets a lower rating because it has a 1.375 rear pinon bearing (742 = 1 3/4 , 489 = 1 7/8) however maybe before we finalize that we should measure the bearings on a Ford nine inch and a Dana. It night surpise yu to find they are similar. Since all Mopar 8 3/4 use the same diameter pinion U joint flange hole (either coarse or fine spline.) The weakest link if there is one is the same spot for all three. Failure is pretty rare. I ran a 741 case in my MAX WEDGE 426 car with 3.91s for almost ten years and I abuse that car . 3800 stall Lupo converter and 30.5 inch tall rear tires with a 9 1/2 inch tread. I replaced it about a year or so ago with a 3.55 gearset for cruisin which just happened to have a 489 case and i took the 741 with its 3.91s and put it in my rail. They are a real good diff and while a 489 or742 would be desireable unless you have a firebreathing monster under the hood any of the three will stand anything you can give it.   - Don. D. 
>

>  >> Just pulled the Rear End from my 62 Sport Fury
>  >> The part number on the housing is 2070741
>  >> Is this the correct 8 3/4 set up for a big block?
>  >> If not what should I be looking for, I plan to put in a 413
>  >> Mark

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