68 c10 factory 4.11 ratio?

[70ssclone]

My 68 i aquired was an unmolested survivor , besides a motor replacement it was an original v8 3 speed truck . I just put a tach in it and according to gps mph at 55mph it's turning around 2600ish rpm with a 31in tire out back . Does that sound right ? I didn't think 1/2 ton trucks got that steep of a ratio . One thing is for sure, I can't go with any smaller tire .

[68bowtie]

it should be against forum rules to say the phrase "unmolested survivor" without posting pictures.

i would jack it up and check the gear ratio, i believe they did come with high gears in 68. do you have the spid sticker in the glove box?

[Alex V.]

That sounds about right for 4.10's and yes, anything over 55 on anything smaller than those 31's is gonna have it wound pretty tight. Bringing your tires down a size with an OD transmission should make it pretty nice, or bumping down to a 3.73/3.55 unless you want an especially long-legged cruiser.

[68panelman]

My 67 has the factory 4:10 rear. With a six and 225/75/15, she's happy at 55-60.

[Mike C]

What does the SPID say? I would assume the standard gear for that was 3.73 so the next gear option would most likely be 4.10. Towing package?