# Do 3:73's & 3:69's match?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Ryan B., Oct 23, 2002.

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2. ### tRustyK5Big meanieStaff MemberSuper ModeratorGMOTM WinnerAuthor

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Re: Do 3:73\'s & 3:69\'s match?

Yes they do. The difference is actually .0349, not .04.

Rene

3. ### Ryan B.3/4 ton statusGMOTM Winner

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Re: Do 3:73\'s & 3:69\'s match?

Right...
0.0349 difference...

So what is the limit or rule of thumb for how much difference you can have? is it 0.10 difference?

I guess the Dana60 48:13 which calculates to 3.69230 gear ratio... is what youd call a "3:73" ratio since its close enough.
Thanks Rene. /forums/images/graemlins/grin.gif

4. ### wrathORC1/2 ton status

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Re: Do 3:73\'s & 3:69\'s match?

1% is the rule of thumb.

Furd is notorious for having different ratios front and rear. 'nother reason Furds are failures.

5. ### bajaviking1/2 ton status

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Re: Do 3:73\'s & 3:69\'s match?

As far as I know the rule of thumb is 1% difference is allowed, which is about what you will have in this case.

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Re: Do 3:73\'s & 3:69\'s match?

Rene, how'd you get those numbers. I though % difference was derived by 1-(3.69/3.73)= .01072 That times 100 (for %) equals 1.07% (close enough to 1). Am I calculating incorrectly? I ratio minus another gives mathematical difference, not % difference. Maybe that is what to look for /forums/images/graemlins/confused.gif /forums/images/graemlins/1zhelp.gif

7. ### Troopie's Tonka1/2 ton status

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Re: Do 3:73\'s & 3:69\'s match?

haha..smart ass /forums/images/graemlins/ears.gif

8. ### tRustyK5Big meanieStaff MemberSuper ModeratorGMOTM WinnerAuthor

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Re: Do 3:73\'s & 3:69\'s match?

Chris...I never figured out the percentage difference, but I could see it was within 1%. I did have the decimal point over too far though./forums/images/graemlins/blush.gif I should re-read my replies a little more carefully sometimes.

Rene

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