You talked me into it. 727 to a 904

Update. So I have had the 727 out for some time now while making money to spend it. So thing are starting to happen and they are happening quickly this week because the March Meet is right around the corner. First the 904 build. I got everything that was on the “Recipe list” plus a few more. Since I am going with a 1989 case I have 12 rollers for the rear sprage and it is a true bolt in unit, very nice. I also got a 4340 input shaft. This will be sweet so that’s one less thing I will break. I am going to use the same Trans brake that I had in my 727, Coan billet unit. I also just got the Mark Williams 904 1350 u-joint trans yoke. I am going to go with the low ratio first and second gears for this build. If they don’t work well then the other set will go right in. Continental Converters is making me a custom Billet converter that is a full roller.

Now for the rear end. I have had this set up for a while and had good luck with it but now that I am going to be throwing a little more torque multiplication at it and the fact that it is over 15 years old I pulled it out to look at it. I am running a narrowed 8 ¾ 742 case with 4.30 gears with a 28 x 10.5 hoosier slick. This is all fine and dandy but I have always wanted to go with a taller tire so no time like the present to do this. This time I am going with a 29 x 10 hoosier slick and changing to a 4.56 gear. The axles are Moser 35 spine with the matching spool, no change there but here is what I can’t wait for. I dropped some cash on an Aluminum 8 ¾ center section. This is what I have wanted from the get go but never really wanted to mess with the rear end till it broke. It never broke so I am changing it now. I will be taking pics and posting them along the way. I just did a mock up with a 904 case in the car today just to make sure the trans mount worked and everything bolted in.