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post #1 of (permalink) Old 03-18-2001, 08:59 PM
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2500 HD rear axle

I was just wonderin, Does anybody know what rear axle is in the 2500HD? Should it be the same with both gas and deisel?

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post #2 of (permalink) Old 03-18-2001, 09:28 PM
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Re: 2500 HD rear axle

Can't say on a diesil, but my work's 95 GMC 2500 has a 14 bolt SF out back.

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post #3 of (permalink) Old 03-18-2001, 10:41 PM
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Re: 2500 HD rear axle

I think the 2500HD's have a 14FF and the 2500's have a 14SF

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post #4 of (permalink) Old 03-18-2001, 10:47 PM
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Re: 2500 HD rear axle

Depending upon the year, and engine option. The previous year HD2500's the gas and deisel have the same corporate 14 bolt FF with a 10.5 ring gear. Now the new 2001 HD2500 and 3500's with a 6.0 have the above rear axle. The 8.1 and Duramax use a 14 bolt FF with a 11.5" ring gear.
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post #5 of (permalink) Old 03-19-2001, 09:51 AM
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Re: 2500 HD rear axle

<font color=purple>The new 2500HD comes standard with the 10.5" FF 14-bolt. That's with the Vortec 6000 only. If you get the 8100 or 6600, the rear is upgraded to an all-new 11.5" "Super 14" FF rear. In either case, the front is a strengthened version of the 9.25" IFS.</font color=purple>

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post #6 of (permalink) Old 03-19-2001, 01:42 PM
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Re: 2500 HD rear axle

sounds good, but whats the deal with being forced to get 3.73's with the diesel... the 4.10's arent even an option[img]/wwwthreads_images/icons/tongue.gif[/img].

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post #7 of (permalink) Old 03-19-2001, 02:39 PM
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Re: 2500 HD rear axle

What front and rear come in a new 3500 hd 4x4 crew cab, the same as the 2500 or heavier duty?

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post #8 of (permalink) Old 03-19-2001, 02:57 PM
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Re: 2500 HD rear axle

This is an excerpt from one of the many dieselpage articles about the new HD pickups.

Duramax 6600 The New GM Diesel Trucks -October 1999

"Big power needs a strong rear differential. GM is using a corporation built differential with a 11.5" diameter ring gear and synthetic gear oil in the new Duramax trucks. Earlier 3500 series trucks used a 10.5" differential, and most 2500 series trucks used a 9.5". All Duramax diesel equipped trucks will have just one available axle ratio, 3.73. With an engine torque curve "flat enough to set a glass of water on", the 3.73 axle ratio combines the best attributes of torque multiplication required for heavy-duty towing and higher gearing for "best in class" fuel economy. (Bigley, Jim)"

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post #9 of (permalink) Old 03-19-2001, 04:30 PM
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Re: 2500 HD rear axle

I am really glad to see GM put the 14 bolt FF in the 2500HD.
That is one hell of an axle.

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post #10 of (permalink) Old 03-19-2001, 10:29 PM
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Re: 2500 HD rear axle

well i guess that explains it, dieselboy.

ive asked this before, but NEVER got a response: what is the city/highway milage of the duramax!!!?

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