What gear ratio for a 9in

[86WH1turbo]

I can get a smokin deal on a currie 9in from a friend of mine but I want to stay as close as possible to stock gearing. I see you can get either a 3.40 or 3.45 for it. Which would be better and why? Thanks for any help.

 

[HOT ROD-GN]

I can get a smokin deal on a currie 9in from a friend of mine but I want to stay as close as possible to stock gearing. I see you can get either a 3.40 or 3.45 for it. Which would be better and why? Thanks for any help.

whats your combo?345 or 340 both are good..

 

[86WH1turbo]

stroked and forged bottom end
champion cnc ported and polished heads
218/218 roller
PT67 GTQ
Percision FMIC
Alky
Postons headers
70MM throttle body
72lb inj
PTC 3200 converter
Full billet trans
and few other things

 

[KevinB]

My 9" has a 3.50 gear. somewhat similar combo except a th400 and 70gtq.

 

[86WH1turbo]

any likes or dislikes w/the 3.50 gear?

 

[toofastforyou]

I can get a smokin deal on a currie 9in from a friend of mine but I want to stay as close as possible to stock gearing. I see you can get either a 3.40 or 3.45 for it. Which would be better and why? Thanks for any help.

I'd go with the 3.40's. They're the closest ratio to stock and you shouldn't see any difference in the speedo reading...

Claude.

 

[KevinB]

any likes or dislikes w/the 3.50 gear?

It works great with 28" tall tires at the track and does good on the street. No dislikes but I've never had any other gear in the car but the 3.50 to compare it to.

 

[TR Custom Parts]

Running 3.50's with a 28" tall tire as well. What are you running for rear tires??

 

[86WH1turbo]

275/60/15 nitto DR
Is the work worth it to put a 9" rearend in?
Any issues with the wheel sizes going from an 8.5 to a 9"?

 

[forcefed3.8's]

Not worth it, you already have the good parts don't you? I know of plenty of cars with similar combos running just replacemant axles. The 9" will eat up more power too.

 

[bison]

If you plan running into the 9's some day id go for it. As far as gearing goes you need to look at you converter mph goals, converter efficiency, and how hard you will be leaving when racing. For a car like yours with a GTQ id assume you plan on running 9.80-10.0. So i would build the combo around running 137-138mph. Your cam will take you to 6000 with iron heads. Id gar it based on that info. Personally id go with a lower numerical number than3.50.

 

[86WH1turbo]

Rob, yes the 8.5 thats in it is pretty well built. I dont know how much I will race the car but I will probably just buy it and someday put it in or hold on to it as a spare.

Bison, more like 3.40 or would you think further?

 

[49-blues]

Im running a 350 as well in my nine inch and i like it!