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Transmission overhual

I was wandering about a transmission overhual. Whats the difference between the 4t65e and the 4t65-hd and where can I get a kit for the 4t65-hd?
 


the difference is the gear ratio and the differential and cover everything else should be fairly comparable tho some years have some strange things done to them, you can grab a kit and various other parts from tripleedgeperformance.com tell dave Todd S sent you.
 
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