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Old 02-24-2017, 03:36 PM   #26
kolohekane
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Re: 1968 c10 gear ratio for highway

Thames Jocko and Clay
My truck is C10 looking at the vin# it started life with a six in it.
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Old 02-24-2017, 03:47 PM   #27
jocko
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Re: 1968 c10 gear ratio for highway

Interesting - that would have come with a 3.73 standard or 3.07/4.11 optional, none of which would give you 3k rpm at 55 mph. So, someone must've made some changes along the way or your speedo is way off, or both perhaps. Is it a 6 or 8 cyl tach?
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Old 02-24-2017, 04:17 PM   #28
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Re: 1968 c10 gear ratio for highway

My 68 originally was a manual and 327. It has 3.07 ration which appears to be stock. has decent power for what I want to do...
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Old 02-24-2017, 09:00 PM   #29
kolohekane
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Re: 1968 c10 gear ratio for highway

Jocko it has a factory repop 8cyl tachometer. Th e more I get into the truck the more it seems he was trying to make a stop light racer out of it. The cam has a lumpy idle and low vacuum. Its going away for a R.V. cam also has a Victor dual plane manifold I will probably keep it. So all that being said I would tend to believe that it has had 411 raio put in.
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Old 02-24-2017, 10:04 PM   #30
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Re: 1968 c10 gear ratio for highway

MPH indicated is about 10mph high. 700r4/3.73
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi
07 335 sport turbo 6sp
94 Trans Am GT LT1 6sp posi -- sold after 22yrs
99 540 sport V8 6sp -- sold
73 240z L24 4sp -- given to friend
68 C10 step 350/350 3.73 open -- sold
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Old 02-24-2017, 10:11 PM   #31
trac209
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Re: 1968 c10 gear ratio for highway

Quote:
Originally Posted by weq92f View Post
MPH indicated is about 10mph high. 700r4/3.73
What dia tire do you run? That seems low for 90plus mph
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Old 02-24-2017, 10:36 PM   #32
weq92f
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Re: 1968 c10 gear ratio for highway

20" wheel, 295/40/20 tire.

-klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi
07 335 sport turbo 6sp
94 Trans Am GT LT1 6sp posi -- sold after 22yrs
99 540 sport V8 6sp -- sold
73 240z L24 4sp -- given to friend
68 C10 step 350/350 3.73 open -- sold
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Old 02-24-2017, 10:39 PM   #33
kolohekane
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Re: 1968 c10 gear ratio for highway

That's a good looking dash panel ya got there. That speed and RPM are a lot more what I have in mind. Thanks for the input.
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Old 02-24-2017, 11:00 PM   #34
weq92f
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Re: 1968 c10 gear ratio for highway

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Originally Posted by kolohekane View Post
That's a good looking dash panel ya got there.
Thanks!

-klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi
07 335 sport turbo 6sp
94 Trans Am GT LT1 6sp posi -- sold after 22yrs
99 540 sport V8 6sp -- sold
73 240z L24 4sp -- given to friend
68 C10 step 350/350 3.73 open -- sold
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