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Author Topic: How to figure out what gears I have in rear end  (Read 6483 times)

Offline cali6shooter

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How to figure out what gears I have in rear end
« on: February 03, 2015, 05:57:04 pm »
1980 4.1 liter I 6 1500 2 WD pu
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Offline fxrsrider

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Re: How to figure out what gears I have in rear end
« Reply #1 on: February 03, 2015, 06:31:55 pm »
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Offline Irish_Alley

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Re: How to figure out what gears I have in rear end
« Reply #2 on: February 04, 2015, 02:19:38 am »
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline zieg85

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Re: How to figure out what gears I have in rear end
« Reply #3 on: February 04, 2015, 03:15:14 am »
 (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified)

The only true way is to pull the cover and see what ratio is stamped on the ring gear and do the math.
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Offline Irish_Alley

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Re: How to figure out what gears I have in rear end
« Reply #4 on: February 04, 2015, 03:20:24 am »
lol i miss read the post
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline ehjorten

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Re: How to figure out what gears I have in rear end
« Reply #5 on: February 04, 2015, 08:44:33 am »
When was the last time the rear differential fluid was changed?  Perfect time to pull the cover, drain the oil and count teeth and/or read the ratio stamped on the edge of the ring gear.
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-Erik-
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Offline BADAZ chevy guy

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Re: How to figure out what gears I have in rear end
« Reply #6 on: February 04, 2015, 11:35:13 am »
Quote from: Irish_Alley on February 04, 2015, 03:20:24 am
lol i miss read the post
Ya, but watching your little 4x4's pull that huge banner across the screen was kinda cool. lol
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Offline Captkaos

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Re: How to figure out what gears I have in rear end
« Reply #7 on: February 04, 2015, 11:39:12 am »
As Erik stated the only way to know for 100% sure is to pull the cover.
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Offline cali6shooter

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Re: How to figure out what gears I have in rear end
« Reply #8 on: February 05, 2015, 04:36:52 pm »
Yea it was changes couple months need to get new gasket other than cork it seems useless I have the 3 speed with granny low almost positive rear end has never been upgraded gear teeth look amazing BTW its 1980 1500 Cheyenne  any one know which options Chevy offered in 1980
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Offline Captkaos

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Re: How to figure out what gears I have in rear end
« Reply #9 on: February 07, 2015, 09:50:11 am »
Factory for an I6 with standard suspension.  2.73, 3.08 or 3.42 depending on the trans.
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Offline cali6shooter

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Re: How to figure out what gears I have in rear end
« Reply #10 on: February 11, 2015, 12:52:05 am »
Thanx everyone update when I take off case
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