Im planning on installing an eaton posi and 3.73 gears into my car this spring I know how to correct my speedo by replacind the speedo gears in the tailshaft of my stock tranny. However im hopping by the end of summer to have an LT1 and 4L60e tranny installed. My question is what will i have to do to get my speedo working correctly...Ive been told that with dropping in the 460le i wont have to do anything....but I want to be certain before i do this.
Thanks

 

Get the correct gears for the 4L60
http://www.transmissioncenter.net/sp...n_______va.htm

The LT1/4L60E has a magnetic VSS. You change gears by tuning the PCM for it

Your stock 4L60 is hydraulically controlled with converter lockup in the ECM. The 4L60E is completely controlled by the PCM. While externally similar and sharing most of the internal components, the transmissions are not directly interchangeable from a function perspective

 

thanks you would'nt happen to know which gears ill need.. I looked at the website and Most of this stuff is like reading japanese to me..lol

 

There are two gears associated with 3rd gen VSS

Drive and driven

Drive is on the output shaft of the transmission. You must remove the tailhousing to access this one



The driven slips over your VSS and pops back in there



The ones with the plastic shaft attached are for cable driven VSS', you cant use these

To use the chart, first pick your gearing. In your case 3.73. Next measure the diameter of your rear tires. Assuming you're stock, thats 28" or so. Find the 3.73 section and move down until you find your tire height in the second column. Then you will see the driven gear tooth count, 40 tooth in this case. Look at the top of the chart to see what drive gear you need

Google tire calculator if you want a precise measure of your tire diameter based on the numbers on the sidewall

 

Thanks that helps alot