Quote:
Originally Posted by minitruckr28
Hello guys,
i was just wondering if somebody can walk me threw a 3o5 with 700r4 swap. i know i have to cut out the cross member for the old three speed and use a 67 to 72 tranny cross member but i would like to know if my stock rear end needs to be changed. This will be my daily driver so i would like decent gas milage.
Thanks
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If your truck came with a 6 cyl and a 3 on the tree It probably has 3:73 rear gears.
If it had a 4 speed most likely 4:10
Now the question becomes what is the diameter of the tires you run on the rear ? if they are stock size then you will be fine, but if you are going with 30" diameters on the rear you might be questionable on pulling them with a 305. send me the rear tire diameter from the ground to the top of the tire and I will plug them into a spreadsheet that figures speeds, and usable torque to the ground for different engine/ra ratios/ and transmissions. then we will have a little better idea how it is going to work. Kieth
send me a pm on this board along with your email address so I can forward a copy of the spreadsheet to you in a email.......
