I need to pick up a speedo pinion for my 74 904. I know which tooth count I need but as I am looking I see short shaft, long shaft etc. Can these be swapped shaft to shaft? Can I just find the gear and use what's in my trans now?

Thanks in advance!

what tooth count? should be a long shaft in 74, should look like this

http://cgi.ebay.com/ebaymotors/NOS-Mopar...sQ5fAccessories

Undecided on tire size yet, but it will be either 33 or 36. I may grab both sizes for now and sell the one I don't need. Thanks for the reply.

Axle Ratio
24" 26" 28" 30"
2.76 2538930(Yellow) 2538928(White) 2538926(Red) 2538924(White)
2.94 2538932(Black) 2538930(Yellow) 2538928(White) 2538926(Red)
3.21 2538935(Orange) 2538933(Yellow) 2838931(Green) 2838929(Black)
3.55 2538939(Green) 2538936(Red) 2538933(Yellow) 2538931(Green)
3.91 2538943(Blue) 2538940(Orange) 2538937(White) 2538935(Orange)
4.10 2538945(Yellow) 2538942(White) 2538939(Green) 2538936(Red)
4.30 2538944(Black) 2538941(Red) 2538938(Blue)
4.56 2538945(Yellow) 2538943(Blue) 2538940(Orange)

Thanks, I have that chart, but I'm not sure what size tire I'm going to run yet. If I go with a 28" tire then I need new wheels. Right now I'm running a 14" Rallye wheel and the biggest tire I can find for it is a 25.6 tall tire. Sooo it's probably the 36 gear for now. Thanks a bunch, off to ebag.