200R4 calculating final gear ratio in 1st

Rocketrod · Feb 21, 2005

I am contemplating buying a BTO 200R4 setup, but BTO couldn't tell me what the final ratio would be in 1st gear (2.74) w/ 25.7" tall tires and 3.73s in the rear end. Does anyone know this formula or a site that has a calculator?

Thanks in advance.

wayner · Feb 21, 2005

Try this site, it even has GM part #'s

http://www.tciauto.com/tech_info/speedo_gears.htm

wayner · Feb 21, 2005

Doah,

I didn't read your post properly, sorry.
Here is another link, although it maynot have what you want

http://nastyz28.com/2gcog/stegmiller/camcalc.htm

67 Plum · Feb 21, 2005

2.74x3.73=10.22 overall 1st gear ratio.The tire diameter doesnt change the gear ratio.Taller or shorter tires will make it seem like it has different ratios.

Rocketrod · Feb 21, 2005

67 Plum,
I understand it won't change the actual gear ratio but, as you stated it will make it seem like it has a different ratio. That is the number I want to calculate. So with the combo listed in my original post my 3.73s would accelerate like 3.90s, 4.xx??

67 Plum · Feb 21, 2005

What trans. do you have now?

DjD · Feb 21, 2005

Are they re-gearing the 700 at bowtie overdrive? Stock 1st gear is 3.06:1 in that trans...

67 Plum · Feb 21, 2005

He is looking at a 2004R not a 700.

Rocketrod · Feb 21, 2005

I currently have a TH350

67 Plum · Feb 21, 2005

10.22 divided by 2.54=4.02rear gear to equal 3.73 with 2004r.2.54 is 1st gear in a 350.I am not sure of a calculation to figure in different tire diameters.

Fast Jack · Feb 22, 2005

67Plum the 200r4 doesn't have a 2.54 low it has a 2.74 low

rojo · Feb 22, 2005

Jack,

Chad is saying you'd have to have a 4.02 rear gear with a TH350 to equate to a 3.73 gear with a 200-4r. That comparison is for 1st gear only.

DjD · Feb 22, 2005

Originally posted by 67 Plum:
He is looking at a 2004R not a 700.

I don't know how I missed that... Maybe I should look into a hearing aid, the glasses don't seem to help!!

67 Plum · Feb 22, 2005

Yeah Dennis the numbers seem to run together when you look at the screen alot.A hearing aid might help though.

Fast Jack · Feb 27, 2005

OK, I see what your point is now. I get it.

200R4 calculating final gear ratio in 1st

Rocketrod

wayner

wayner

67 Plum

Rocketrod

67 Plum

DjD

67 Plum

Rocketrod

67 Plum

Fast Jack

rojo

DjD

67 Plum

Fast Jack

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