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Jul 12, 2002 | 10:59 PM

bryan_henry

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axle?

rear end gear ratio I have other then from the VIN code. The sticker is on the truck but there is no numbering in the axle section

Jul 13, 2002 | 08:44 PM

tetraruby

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axle?

Check the metal tag usually on one of the bolts at the rear axle wear the third member bolts into the pumpkin. The second line of text, first three digits should give you the information you want. You'll probably need a a rag and / or wire brush.

Jul 14, 2002 | 12:01 PM

bryan_henry

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axle?

[updated:LAST EDITED ON 14-Jul-02 AT 01:06 PM (EST)]thanks for the info but still not real sure what I am looking at. I found the tag and the numbers are

2 72 D7TA JA
603903-1

does this mean anything to anyone else? Thanks

Jul 14, 2002 | 01:25 PM

tetraruby

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axle?

...or maybe it was the first line of text...sorry about that. I'd check the first line again...particularly the 2 72. My best guess is a 2.73 & since you found no "L" - an open differential. I'm sure another member here can give a second opinion.

Jul 15, 2002 | 09:54 AM

ledgeclimber

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axle?

The "D7" means 1977. The 603903 is the Bill of Materials number but this number is not on the Dana site or my Dana books. Check it again. I did not see this entire thread. Is it a rear or front?

Ledgeclimber

Jul 15, 2002 | 06:06 PM

bryan_henry

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axle?

[updated:LAST EDITED ON 15-Jul-02 AT 07:12 PM (EST)]It is rear...2wd truck...I rechecked it and those are the right numbers. Thank you so much for your help

Jul 16, 2002 | 11:22 AM

ledgeclimber

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axle?

Here is another site but it is not on there either.

http://www.patooyee.com/Dana/By%20BoMN.htm

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Jul 16, 2002 | 06:32 PM

tetraruby

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axle?

Support the rear axle with jackstands, put it in neutral, and count how many times the drive shaft rotates per tire rotation. You'll also find out if you have limited slip or an open differential for sure.

Jul 16, 2002 | 07:35 PM

#10

bryan_henry

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axle?

the driveshaft turns 1 and a quarter turn per tire rotation. The axle is limited slip. What does the 1 and a quarter turn mean?

Jul 16, 2002 | 07:59 PM

#11

Mil1ion

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axle?

Why not just pull the cover off and count the teeth on the pinion gear & ring gear > then do the math.
This is a NO Fault method.

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Jul 16, 2002 | 08:13 PM

#12

shortbedford

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axle?

Hey bryan are you sure you counted that right you either have very small tires or extremely low gear ratio.Make sure you mark that driveshaft and tire to make sure you count it correctly and try it again.

Jul 16, 2002 | 08:31 PM

#13

bryan_henry

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axle?

doesn't sound right to me eaither. I have 70 series tires....don't have the exact measurements but they are larger then stock and I did mark both driveshaft and tire. I think I will just have to pull the cover. Thanks