Ok guys i have searched but seems lik emost everything i have found is for mechanical speedo, i have a 91 TA and i am going from the stock 3.23 to a LS1 3.42 rear for brakes and tiny bit of gear help. Can i change out teh gears in tranny? or what i steh best way on a electric car?

 

Should be the same as with mine - I swapped from a 2.73 rear to a 3.42 rear - just remove the tailhousing and change the gear - and change the gear in the speedo sender on the driver side of the tranny. Check the Tech Articles for specifics on changingh the gears, and to get the right gears for replacements.

You'll see somewhere along the line for sale a "new speedo gear housing" - they say that certain gears won't fit in the stock housing, but I didn't have any trouble with mine fitting. The "new housing" is very expensive, and for me, not needed.

I know it doesn't make sense - but you'll understand once you see some pics.

Check out this for the gear pics in the tailhousing:

http://www.bowtieoverdrives.com/cata...AT&CATID=DA2A1

Check out this for pics of the speedo housing gears:

http://www.bowtieoverdrives.com/cata...AT&CATID=DA2A2

Check this page also - the bolt, clip, retainer, and o-ring are the small parts you want to make sure you don't lose or break:
http://www.bowtieoverdrives.com/cata...BCAT&CATID=DA2

Here's the Tech articles:

https://www.thirdgen.org/newdesign/f...n.shtml#tranny Scroll down and look for speedo gear correction

https://www.thirdgen.org/newdesign/t...eedogear.shtml

 

You will need:
14071731 7 tooth drive gear
14090592 19 tooth driven gear
Both are available from your local GM dealer.