Speedo Correction Gear???
Thread Starter
1st Gear
Joined: Apr 2007
Posts: 1
Likes: 0
From: Dayton Nevada
Speedo Correction Gear???
1972 Turbo 400 trans; changed rear end gears from 336 to 308; car has 235-70-15 tires and is running about one tenth of a mile slow in a measured mile.What speedo gear needs to be put into trans to correct speed? Can reply here or to email--JosieL@Prodigy.net HELP!!!
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
Don't have the chart for part numbers for ratios, but this link may put you in the right direction. You will have to check the color gear presently installed, and use one that is about one tooth less. (Each tooth difference = around 3 mph)
http://www.tciauto.com/Products/comp...eter_gears.asp
http://www.tciauto.com/Products/comp...eter_gears.asp
Instructor
Joined: Apr 2006
Posts: 114
Likes: 0
From: Spring Texas
Here is another option for you. Look down the web page. He has some external speedo adjusters for GM.
http://www.transmissioncenter.net/sp...n_______va.htm
http://www.transmissioncenter.net/sp...n_______va.htm
