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-   -   Which rear end would I be better off with? (https://classracer.com/classforum/showthread.php?t=57286)

ATI Performance Products 03-21-2015 07:05 PM

Re: Which rear end would I be better off with?
 
Quote:

Originally Posted by GTX JOHN (Post 465491)
We have run 8 3/4 in our Volare / Aspen Stockers for many years with only
a couple of Failures in the Very Heavy Wagon at 3620 to 3850 Weight.

I would consider a looser converter 5200 (360) - 5400(318) to go with the 5:13 Gears which should be right a low elevation.

My Chassis guy said with same amount of lightning the Dana would be
40 to 50 heavier than 8 3/4. Does anyone know if he is right?

We are changing the Challenger over to a Dana right now. I need to run a 5.13 at our weight and the 8 3/4 would ratio would break in less than 10 passes. But a 4.88 would last 100 passes usually. We are 3470 lbs. And yes it sucks to break a gear with a 904 and then worry about the sprag - even with the big sprag we made for them it was 50/50 weather or not it was junked. - Also of note is that I will have 4, nice 8 3/4 pumpkins to sell! 2 Alum and 2 steel.

LNorton 03-22-2015 12:09 AM

Re: Which rear end would I be better off with?
 
Quote:

Originally Posted by ATI Performance Products (Post 465549)
We are changing the Challenger over to a Dana right now. I need to run a 5.13 at our weight and the 8 3/4 would ratio would break in less than 10 passes. But a 4.88 would last 100 passes usually. We are 3470 lbs. And yes it sucks to break a gear with a 904 and then worry about the sprag - even with the big sprag we made for them it was 50/50 weather or not it was junked. - Also of note is that I will have 4, nice 8 3/4 pumpkins to sell! 2 Alum and 2 steel.

^ This! Go Dana and forget about it.

SST3193 03-23-2015 05:34 AM

Re: Which rear end would I be better off with?
 
Any Dana experts have a suggestion, for a 1976 Ford housing, that houses 3.50:1 only? We built a 4-linked street car for a friend and would like to have a 4.10-ish range ratio. With the tall rear tires and 3.5 it sure does good on the Interstate but rarely leaves city streets.

GTX JOHN 03-23-2015 07:13 AM

Re: Which rear end would I be better off with?
 
I did not know their are 4 different weight Dana 60s. Does know how to tell
them apart. The ones I have used are center sections out of 80s Trucks
with Chrome Moly Tubes.

FED 387 03-23-2015 12:07 PM

Re: Which rear end would I be better off with?
 
no expert here but from my experience there is a HD cast into the housing look for it top of rib left side of the "heaviest" Dana 60 ,otherwise the diameter of the axle tubes determines the lightness of the housing with 3 inch tubes being the heaviest---the OEM centers are really the same---supposedly there is a "501" Ford Dana 60 that is the lightest but I do not know what vehicles it came in--FED 387

Michael K 03-23-2015 01:38 PM

Re: Which rear end would I be better off with?
 
I've been considering replacing my 8-3/4 with the Strange 60 housing. Pricing seems good.

older racer 03-23-2015 02:15 PM

Re: Which rear end would I be better off with?
 
hi, the four dana 60's are, lightest is in a 67 to 72 ford 1/2on pickup, next is mopar b and e body cars, next 3/4 ton pickups and heaviest is 1 ton pickups. I found an article in a four wheeler magazine years ago. they listed the dana's . the 1/2 ton ford one has passenger car ends on it, easy to spot. it weighs 32 # more than 8 3/4 . has 3 " tubes. also, I found a dana 60 from a J 20 jeep pickup. it has 2 3/4" tubes on it , passenger car ends as well.

Rod Greene 03-23-2015 05:50 PM

Re: Which rear end would I be better off with?
 
If you are building one for a race car. Do it the right way. Strange S60 center molly tubes, 40 spline ultra lite axles from MW Aluminum spool back cut ring gear. It will be bullet proof and only about 20lbs heavier than a back braced ready to run 8 3/4 that will break anyway. If you are worried about changing gear ratios at a race it is really quite simple. With the S60 you have adjusters for back lashand preload. You set your pinion gear up with bearings and shims. You can change gears in under an hour.


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