What else do i need to upgrade on my 1990 Pontiac Firebird EFI 5.0 305, to make this work properly

 

The gear in the tansmission will need to be changed to keep the speedometer accurate.

 

so, would that be a ring and pinion gear like this ...

http://cgi.ebay.com/ebaymotors/GM-7-...Q5fAccessories

 

No. Tho's are the gears in the carrier its self. I think its a small plastic gear and it goes behind the tranny I believe.

 

Do you have any idea what that part is called? If you are able to search for it on ebay copy and paste the link in a reply

 

not something you get on ebay, chevy dealership

use this thread, you might have to pm the OP

https://www.thirdgen.org/forums/tran...eedometer.html

 

You'll need the ring and pinion, of course, and all that goes with replacing them, as well as the drive and driven gears to make the speedo read correctly. Phone these guys for what you need:

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

The following FAQ may provide some info to consider:

https://www.thirdgen.org/forums/tran...-10-bolts.html

JamesC

 

Will replacing the drive and driven gears to match the rear affect the way the car drives (or shifts)?

 

No.

JamesC

 

PM me if you need any more help figuring it out.