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- The 1967 - 1972 Chevrolet & GMC Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=3)

- - 1972 GMC Gear Ratio (https://67-72chevytrucks.com/vboard/showthread.php?t=779439)

jlampka

01-13-2019 01:46 PM

1972 GMC Gear Ratio

Howdy - just bought a 1972 402 ci, TH400 1 Ton pickup. What rear end gear ratios came on this truck? Thank you!

Already Gone

01-13-2019 07:08 PM

Re: 1972 GMC Gear Ratio

1 Attachment(s)

Looks like 4:10's

68350

01-13-2019 11:19 PM

Re: 1972 GMC Gear Ratio

Interesting to note a 3/4 ton big block auto had 3.54 standard. I’m surprised they changed to 4.10 for a one ton

1972RedNeck

01-13-2019 11:36 PM

Re: 1972 GMC Gear Ratio

IS the OP's truck a single wheel or dually? I bet it makes a difference...

jocko

01-13-2019 11:48 PM

Re: 1972 GMC Gear Ratio

3.54 not available in a C30. 4.10 was standard for all V8 C30s from 6600-14000 GVWR, with the exception of those equipped with the H22/H23 11000 lb axle, which could have 5.43 or 6.17.

special-K

01-14-2019 08:02 AM

Re: 1972 GMC Gear Ratio

No Dana 60s in C/30s.

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