700R4: Changing the Driven Gear

[fasterthanu]

Quick questions for ya out there. I know how to change a speedo gear, but how do you change the driven gear on a 700R4 trans? I did a swap in my 76 vette about a year ago, and am off by 30mph at 70. I have 4.11 rear end. Trans shop said you can't get much closer than that. I talked to bowtie, and they told me the proper drive and driven gear I need to put in there. Well, judging by these pictures on this site http://www.transmissioncenter.net/speedometer_calibration_______va.htm I have no ideas how to change the driven gear. Any advice, or help would be greatly appreciated. Thanks

 

[dman535]

You need to remove the driveshaft, unbolt the rear trans cover and slide the gear off. I am not sure if there is enough clearance to do this with the trans in the car. You might end up unbolting the crossmember and lowering the transmission a bit. There are also speedo gear reduction boxes that cost about $100. They are externally mounted and can increase or reduce the speedo cable speed, usually available through any major speedo/auto gauge repair shop.

 

[fasterthanu]

naw, it shall be very easy to get too for me, i am ripping the engine and trans out during spring break =) I like the pic. Sucks, even with my current engine in the car, if I go to break torque the car the front tires get pushed along the ground, they don't loosen, they just get pushed... Plenty of tread on them too..