Rear end gear selection on 69 C10 for drag racing - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-26-2012, 11:26 AM
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Rear end gear selection on 69 C10 for drag racing

Have a 1969 c10 that i plan on using on the drag strip ( 1/8 mi.) occationaly . Has 35/350 combo,12bolt rear. Motor is stock bore & stroke,600 holley, dual plan intake,670h comp cam,2200 stall converter. What rear gears should i use with 29 inch hoosier slicks?

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Old 12-27-2012, 03:13 PM
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Use 4.88 to 5.13 gears
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Old 12-27-2012, 03:55 PM
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you drive this on the street?

those gears above are mighty tall. and iirc not aval for our truck 12 bolt
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Old 12-28-2012, 04:21 AM
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Yes i do drive it on the street (about 120 mi. A year) and thanks much.
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Old 12-28-2012, 06:33 PM
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I'm gonna say start with 4.56 and see if that would be a happy medium for ya.

If you go lower, you won't like the street RPM's.
If you go taller, you will just run slower track times.

It's a trade-off.
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Old 12-30-2012, 01:46 PM
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doesnt sound like a drag race engine?why not use a compromise ratio or race it as it is?
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Old 01-02-2013, 04:51 AM
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This is not a race engine. And have 3.73 gears now. Just want to have fun,but be some what competive.
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Old 01-02-2013, 09:50 PM
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Quote:
Originally Posted by 1952 CHEVY View Post
This is not a race engine. And have 3.73 gears now. Just want to have fun,but be some what competive.
29 rears ain't that tall.
Not a race engine? So you shift at what... 6500 rpms?

Maybe you should try 4.11-4.30:1

4.56 might be too low.

I have 33's on the back of my truck, and my motor is 6500 rpm max.
I had 4.56 in my Ford 9" to start with, and it was TOO LOW.

I got 4.11's in it now, and they are perfect for what I do. ( street / strip )
Of course, I have a hella-torquey bigblock up front, so I can pull a taller gear with ease.
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Old 01-03-2013, 04:56 AM
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Thank you much. I will give it a go when the snow is gone.
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