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What RPM Would it Turn?
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Author:  Rug_Trucker [ Fri Dec 28, 2007 8:13 pm ]
Post subject:  What RPM Would it Turn?
I was wondering with the 833OD and a 2:76 gear what RPM I would turn at 70mph?

I am turning 3000 now with a 3 speed and 3:23's at 70.
Author:  DusterIdiot [ Fri Dec 28, 2007 8:23 pm ]
Post subject:  Depends...
Quote:
I was wondering with the 833OD and a 2:76 gear what RPM I would turn at 70mph?
Making a nasty assumption that you went to say a 205/70R14 tire over the stocker narrow guys that combo would net you 1800 or so rpm at 70 mph...but this also depends on your carburation (I notice that the 1 barrel tends to wind the motor a bit higher to make the same power as say the same mill with a 2 or 4 barrel...)

-D.idiot
Author:  Rug_Trucker [ Fri Dec 28, 2007 8:52 pm ]
Post subject: 
I think that is my tire size. Mounted on 6 1/2" x 14" chromey rusty reverse rims.
Author:  Jeffc [ Tue Jan 01, 2008 3:25 pm ]
Post subject: 
running stock tires (aprox stock) 185\78-14 3.23 rear
1 to 1 3rd @ 65 I was running around 2700rpm
OD 4th was around 2000rpm

now with 3.55 installed
3rd is around 3000
OD 4th around 2400
this is appox since I have not changed the speedo pinion
yet.....

What I found was the 3.23 is too tall with the overdrive,
3.55 is just about right for normal driving with overdrive,

tooth count on the over drive is 74, so with the OD 3.23 was
like 2.49, way too tall for use unless your driving on the flat
at over 70 all day, engine just has to work too hard to
keep speed.....
3.55 is not the best set for the track, or some other uses,
but it works really well with the OD trans and came often
from the factory set up that way in cars with the OD trans......
3.55 with the OD is around a 2.71.....
a 2.76 with OD set would be a 2.02, way tall.......
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