Need to determine true diff. ratio

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Nov 8, 2005 | 05:07 PM

jispr

Thread Starter

Instructor

Joined: Sep 2004

Posts: 208

Likes: 1

From: Lawrenceville GA

Need to determine true diff. ratio

I just signed on here tody and am amazed by how many posts and replies there are!! Anyway 6 year owner of a 1993 lt1 whose spec sheet says I had/have a 2.59, the carrier says 2.73 and the previous owner told me 3.80. So how do I determine the present ratio. If it's
by turning the tire and counting the driveshaft, the shaft turns just about 3 and 3/4 turns for 1 turn of the tire. Its' getting noisy back there maybe more so than just the diff, but all in good time.
Thanks Jim Speer Atlanta Area

Nov 8, 2005 | 05:09 PM

SJW

Le Mans Master

Joined: May 2005

Posts: 7,340

Likes: 2,272

From: Central Maryland

Quote:

Originally Posted by jispr

If you're getting 3 & 3/4 turns of the driveshaft to a single turn of the halfshafts, it's definitely not 2.59 or 2.73. Should be very close to what the previous owner told you.

Surest way to determine it is to count the teeth on both the ring and pinion gears, but that, of course, requires that you have the case open.

Welcome to the Forum.

Be well,

SJW

Nov 8, 2005 | 05:11 PM

rocco16

Race Director

Joined: Dec 2002

Posts: 13,348

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From: SCMR Rat Pack'r Charter Member..Great Bend KS

The "3 and 3/4 turns" you see match up with the 3.80 that the PO reports. I've never heard of 3.80 gears, but that doesn't mean a lot...

Larry
code5coupe

Nov 8, 2005 | 06:36 PM

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

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From: The Top of Utah

Probably 3.73:1. Make sure that BOTH rear tires make exactly one revolution while you are counting the driveline turns.

RACE ON!!!

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