4:30 Gear question

[APMotorsports]

So I grenaded my ring and pinion at the track Saturday night! So I threw a set of Motive 4:10's to get by, but I have a question: I am going to build the rear end this winter and need to know how to get my mechanical speedo to work with 4:30's? I have a 23 tooth gear in the tranny now (which is the biggest I can find) what do I have to do to make it work???? HELP!

 

[whtcobra1998]

speedcal

 

[Gallows]

speedcal

+ 1 Do it right the first time.

 

[Wynn]

I used a white speedometer gear... close enough for me. It's about 5mph off at 60, but I can live with it. Speedcal's are about $100... the speedometer gear was $20.

 

[luke87gt]

Speedcal is the ticket.

Absolutely love mine as it gives you all the versatility you will ever want.

 

[mysicman]

+ 1 Do it right the first time.

I heard "spud trannies" supplies speed-cals with all their used t-45's

 

[Gallows]

I heard "spud trannies" supplies speed-cals with all their used t-45's

It says so right on the website. They also come with a free short runner intake:lol1:

 

[LOVESBOOST]

I had the white gear and they don't seem to last long, I grenaded quite a few of them before I went back to the stocker gear and then used the speedcal, life is good.

 

[Half_ton_hogg]

4.10I have a 03 Harley F-150 and thinking about changing out the rear end to a Motive

I have a 03 Harley F-150 and thinking about changing out the rear end to a Motive 4.10 and want to know what to expect anyone done this or know what gains I'll see?