I just swapped from an open 2:73 rear to a limited slip with a 4:10 ratio. now my speedo reads 100 mph at 70mph. I'd like to have an accurate speedo again. i'd also like to go over 80 every so often. Since I can't seem to find an aftermarket chip I still have the speed limiting governor.

 

Welcome to TGO. A search is always helpful here--as well as listing your year, make and model, etc. For example, if you have a T-5, check the sticky at the top of the page.

JamesC

 

Thanks. And it's an '89 formula 5.0 automatic with stock snowflake wheels and 235-60's for tires

 

Please see this link:

http://www.transmissioncenter.net/sp...n_______va.htm

 

If it's a 700R4 you need the 15 and 45 tooth gears. I just put 4.11's in my 9". It's not spot on, but you'll be within 5mph though... on the slow side(I think).