Speedo gear for AOD and 3.90s???

[Foxfan88]

i am swapping in a rearend soon and i need to know...
Thanks!

 

[willys1]

i am swapping in a rearend soon and i need to know...
Thanks!

In what an 88? I know the later ones needed a 23 tooth (white) but that was for 373's and it was pretty accurate....Your speedo shouldnt be that much off with 390's and the 23 tooth gear.With 410's its way off..

 

[Foxfan88]

in what an 88???
i dont get wha tyour said.
Its an 8.8 rearend and it has 3.90s gears in it. It will bolt right up...
so a 23 tooth? are there any in-between gears??

 

[Michael Yount]

See if this resource won't help....

http://www.geocities.com/mgnedell/notchback/tech/speedo.html

 

[Foxfan88]

does my AOD have a 7 or 8 tooth gear drive??