Help! Cant find new 8" Rear end Differential Third member - Page 2 - Vintage Mustang Forums
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post #16 of 28 (permalink) Old 07-04-2019, 06:12 PM
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I am mostly confused why some one is going to such lengths for such a poor performing rear axle ratio?
Surely you aren’t worried about gas mileage with an old V8 mustang in Europe....
I would imagine you would have a Golf TDI as a daily driver....
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post #17 of 28 (permalink) Old 07-04-2019, 06:52 PM
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The difference between 2.79/2.80/3.00 is not even noticeable- 7%. The 3.00 will provide slightly better acceleration at the expense of higher engine rpm at higher speeds. So for example purposes, when cruising down the autobahn at 120 mph your engine will be turning 3500 rpm with the 3.00 gear vs 3255 rpm with the 2.80 gear.
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post #18 of 28 (permalink) Old 07-04-2019, 08:43 PM
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I like that, cruising at 120 in a vintage Mustang. You damn well better have dialed in that suspension and those brakes if you’re cruising at 120.

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post #19 of 28 (permalink) Old 07-04-2019, 08:53 PM
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I like that, cruising at 120 in a vintage Mustang. You damn well better have dialed in that suspension and those brakes if you’re cruising at 120.
It's the Autobahn! Cruise away! 😃
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post #20 of 28 (permalink) Old 07-05-2019, 01:37 AM
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I am mostly confused why some one is going to such lengths for such a poor performing rear axle ratio?
You have absoluely no idea what application this is for, so how can you say it’s “poor performing”? I have an 8” with 2.79 gears in a 2,000 lb car with 13” wheels and 340 hp.....it ain’t poor performing!

On A related topic, I had my 2.79 third member built by ‘TJ’ about 8 months ago, and he told me he only had a few sets of
(used) OEM Ford gears. While US Gear does make a 2.80 ratio new, he would only use Motiv gears.
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post #21 of 28 (permalink) Old 07-05-2019, 02:05 AM Thread Starter
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Thanks for all the answers.
Actually my main reason to opt for the 2:80 Ratio is originality. Fuel consumption is no problem for me although the gas prices are ridiculous compared to the US. Of course I like to go fast on the Autobahn. However I dont go ober 85 mph because of the level of noise in the convertible. I have other toys for going 120 mph😀
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post #22 of 28 (permalink) Old 07-05-2019, 02:21 AM
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Have you already asked JJ in Voerde? He‘s the admin from the dr-mustang forum. He might be able to help you finding what you need in Germany.
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post #23 of 28 (permalink) Old 07-05-2019, 08:10 AM
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Those shops selling complete 3th members will probably only use their "own" brand of gear, because they really know these and can do the setup very fast... and by that earn money. I'm pretty sure these guy use less than an hour on assembly and setup.

Having all the parts and the needed information/spec, vill probably make it a lot easier to get "cheap" help in Germany.
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post #24 of 28 (permalink) Old 07-05-2019, 11:44 AM
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https://www.quickperformance.com/For...mber_p_39.html


If you contact him, he may be able to swap out the ring & pinion for 2.80s. Can't hurt to ask!


Also - I'm not far from Randy's Worldwide, and they told me they could build a 3rd member for me. It would be expensive, but they do good work. Worth another email at least!


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post #25 of 28 (permalink) Old 07-07-2019, 11:50 AM Thread Starter
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Sadly JJ in Voerde only has one with a 3:55 Ratio.


I contacted quickperfomance but no answer yet.
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post #26 of 28 (permalink) Old 07-07-2019, 02:58 PM
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So out there of curiosity, why do you want 2.80?

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Patrick
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post #27 of 28 (permalink) Old 07-07-2019, 03:10 PM
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Quote:
Originally Posted by Benny View Post
You have absoluely no idea what application this is for, so how can you say it’s “poor performing”? I have an 8” with 2.79 gears in a 2,000 lb car with 13” wheels and 340 hp.....it ain’t poor performing!

On A related topic, I had my 2.79 third member built by ‘TJ’ about 8 months ago, and he told me he only had a few sets of
(used) OEM Ford gears. While US Gear does make a 2.80 ratio new, he would only use Motiv gears.

So you are inserting a non mustang (sunbeam tiger?) into a mustang forum?
A 2.80 rear ratio is not a hot performer in a 3200 lb + mustang.
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post #28 of 28 (permalink) Old 07-07-2019, 09:42 PM
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Call Allen, he's a great guy and many here have used them.
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