Thread: 1960 Gmc 305 v6
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Old July 30th, 2021, 12:37 AM
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Ed Snyder Ed Snyder is offline
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Location: Medford, Oregon
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Default Re: 1960 Gmc 305 v6

Quote:
Originally Posted by ZDADDY View Post
Hey Ed!!!! Thanks for the reply......I think my truck is a halfton it has 6 lugs. Pulling engine tomorrow.I am going to take pumpkin off and see what I got. I posted a pic under rear end disscussion and havnt figured out what I have yet.Someone posted a chart with diffrent rear end pics, but mine does not look like any of them. I really appreciate the feedback.I may take the advise of everyone here going forward on what to do, since most have done it before.

Zdaddy

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With six lugs, yours is definitely a half ton model. I'm guessing your rear end is not original to the truck though. You might be able to figure out what you've got by looking at this page --- https://m.roadkillcustoms.com/differ...ication-chart/ For the best highway cruising, you probably want a ratio somewhere between 3.00 and about 3.50. If you need to change your rear gears, I highly recommend getting a professional shop to do it for you. Changing the rear gears is a simpler, less expensive project than changing to an overdrive transmission. Tall rear tires will help with highway cruising too.
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Ed Snyder
Medford, Oregon
1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1965 2500 Suburban 351C & SM420 with Watson overdrive
1967 CM1500 pickup 351E & NP435
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