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8 3/4 vs. Dana 60 #2682912
07/30/19 10:27 PM
07/30/19 10:27 PM
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dfsmopars Offline OP
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I moved over from the previous discussion on upgrades because I do see that before I move on with adding power I need to assure the rear end is ready for it. The Tremec is supposed to be good for 600 hp so we’re plenty good there. The 8 1/4 has endured what I have thrown at it so far but I am going on the experience of others about its limits.

So of course the 8 3/4 and Dana 60 were thrown out there. I am well aware of the capability of the 8 3/4 and am familiar with the set up and adding disc brakes to it. For me, straight forward.

But the Dana I thought was too much rotating mass and may be an overkill for a small block at even 450 hp with a manual trans.

How available are the right housings and center sections (3.91 gear with ls) going to be for each type? (Going in a third gen b-body) Is there going to be a difference in the cost to build each one? Is there a wow factor with the Dana over the Chrysler unit? Besides strength or longevity will one perform better than another in different situations such as street, auto cross and 1/4 mile? Will narrowing one be easier than the other?

If I have not mentioned something that should be mentioned please bring it up. Thanks!

54A7AD19-9BF2-4909-9024-A15B3DC1D0BE.jpeg

‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683012
07/31/19 10:01 AM
07/31/19 10:01 AM
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Tulsa, Oklahoma
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I will say there was a reason Hemi and 440 manual shift cars came with Dana 60s.

I will also say that from personal experience the higher efficiency of the Dana makes up for the increased weight and your car will as fast with either the Dana or the 8.75.

As far as the wow factor, I think anyone that looked under you car and saw a Dana would think it was a more serious effort than if they saw a 8.75

Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683014
07/31/19 10:03 AM
07/31/19 10:03 AM
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Ontario, Canada
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For 450 HP I sure wouldn't spend the money on a Dana. And the "wow factor" is not that big of a deal either. 8-3/4's are a dime a dozen and readily available. They can be shortened just as easily as any other rear end. They're also significantly lighter than a Dana.

Re: 8 3/4 vs. Dana 60 [Re: Stanton] #2683022
07/31/19 10:23 AM
07/31/19 10:23 AM
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Tulsa, Oklahoma
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I am not saying that he probably could be okay with an 8.75 for a long time but to one of my earlier points, how much HP did a stock 440 manual shift car have back in the day? Did they all not come with Dana 60s?

Re: 8 3/4 vs. Dana 60 [Re: Stanton] #2683024
07/31/19 10:30 AM
07/31/19 10:30 AM
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So Near, Yet So Far
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For anything with slicks and maybe 450HP or so, and especially a heavy car, I'd think Dana.
For a stick car on slicks, I'd think it pretty much mandatory.
For a street car, I wouldn't.
I've built several cars along those lines and haven't broken anything.

Re: 8 3/4 vs. Dana 60 [Re: topside] #2683046
07/31/19 11:14 AM
07/31/19 11:14 AM
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I've shucked 8 3/4 ring and pinions with a 383 4spd. maybe an 8 3/4 will hold up; maybe not. a lot of factors to consider. if you do an 8 3/4 and rip it the initial cost and repairs will be more than the initial cost of a dana.

Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683053
07/31/19 11:31 AM
07/31/19 11:31 AM
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One detail not mentioned, is current tire and/or future tire choice.

I would think an 8.75 would handle anything a 8.25 is currently handling.

There is one upgrade to the 8.75 I would suggest other then well assembled with quality R&P, are upgraded cap(S). a rear brace IMO does little to promote 8.75 member longevity, but it does stiffen the housing, which if that is an issue, you are already in Dana country.

Based on what you shared so far, my choice confidently would be the 8.75.

The key metrics here are IMO, car weight, engine torgue, transmission, tire package, future possible upgrades, and intended use. twocents



Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683057
07/31/19 11:41 AM
07/31/19 11:41 AM
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Aurora, Colorado
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If you need it, I have the stock 1971 8-3/4" housing and axle shafts from my '71 Charger. I sold the center section.
Not sure what shipping would cost?
I seemed to hold up fine running mid 12's, but the limited slip started making noise when I got into the 11's, so I put a Strange S-60 in with a spool.

Re: 8 3/4 vs. Dana 60 [Re: lewtot184] #2683066
07/31/19 12:05 PM
07/31/19 12:05 PM
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Mass
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Originally Posted by lewtot184
I've shucked 8 3/4 ring and pinions with a 383 4spd. maybe an 8 3/4 will hold up; maybe not. a lot of factors to consider. if you do an 8 3/4 and rip it the initial cost and repairs will be more than the initial cost of a dana.



Same here, I've toasted quite a few 8 3/4 rears, even behind a few 340/4spds's..... DANA 60, end of story

Re: 8 3/4 vs. Dana 60 [Re: 451Mopar] #2683067
07/31/19 12:06 PM
07/31/19 12:06 PM
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Philadelphia
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I’m running a 9.25 behind around 450hp/600tq. I re-set endplay with a crush sleeve eliminator, added new upgraded yukon axles, and made sure it would stop well and retain the axles in case of a C-clip failure with jeep JZ disc brakes. I also went with a forged 1350 pinion yoke. I have about $700ish in it total and I have high hopes for a long life on the street with occasional 1/4 mile passes. I also went with a cast aluminum diff cover with bearing saddle supports. That part is mostly bling even though you’ll never see it under my lowered truck but discs and finned aluminum sure looks like more $ than I spent.

1EAA2C9E-CA93-46B7-B7C9-8D3C7A523674.jpeg
Re: 8 3/4 vs. Dana 60 [Re: DAYCLONA] #2683068
07/31/19 12:08 PM
07/31/19 12:08 PM
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Pattison Texas
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Originally Posted by DAYCLONA
Originally Posted by lewtot184
I've shucked 8 3/4 ring and pinions with a 383 4spd. maybe an 8 3/4 will hold up; maybe not. a lot of factors to consider. if you do an 8 3/4 and rip it the initial cost and repairs will be more than the initial cost of a dana.



Same here, I've toasted quite a few 8 3/4 rears, even behind a few 340/4spds's..... DANA 60, end of story


THIS ^^^^^^^^


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: 8 3/4 vs. Dana 60 [Re: CSK] #2683097
07/31/19 01:14 PM
07/31/19 01:14 PM
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Ontario, Canada
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That 9-1/4 is also a good inexpensive alternative.

Re: 8 3/4 vs. Dana 60 [Re: CSK] #2683137
07/31/19 03:28 PM
07/31/19 03:28 PM
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Marion, South Carolina [><]
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Originally Posted by csk
Originally Posted by DAYCLONA
Originally Posted by lewtot184
I've shucked 8 3/4 ring and pinions with a 383 4spd. maybe an 8 3/4 will hold up; maybe not. a lot of factors to consider. if you do an 8 3/4 and rip it the initial cost and repairs will be more than the initial cost of a dana.



Same here, I've toasted quite a few 8 3/4 rears, even behind a few 340/4spds's..... DANA 60, end of story


THIS ^^^^^^^^

iagree Build a Dana and you're done. Building a dana from a junkyard truck rear can be done cheap. Especially if you get one w/ the good track-lock diff. It'll have either 3.54 or 4.10s gears in it already most likely.
The one I put in my dad's road runner came from under an old dodge motorhome/camper van of some sort. Had the good track lock diff and 3.54s w/ a 1350 yoke surprisingly. All we did was narrow it, weld on pass. car ends and perches, and get some 35 spline axles from Dr. Diff. As well as his track-lock rebuild kit w/ the 35 spline side gears.

Backbraces and billet caps for an 8.75 are "feel good" parts. May make you feel better, but do nothing to keep it from shredding the ring and pinion.

dana 60.jpeg

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683173
07/31/19 05:52 PM
07/31/19 05:52 PM
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Brookeville, Md
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what is the car being used for? If you aren't frag racing dropping the hammer at 6k the 8.75 will be fine. If it makes you feel safer back brace it. Looks like a road racing car, a dana adds weight. My old 440-6 Charger went 11.20's @ 121+ had a 8.75 and 3.91's no issues at all. That was much more than 450...not too mention the added torque of a 440.


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Re: 8 3/4 vs. Dana 60 [Re: Mr.Yuck] #2683178
07/31/19 06:27 PM
07/31/19 06:27 PM
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Kentucky
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dfsmopars Offline OP
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Originally Posted by Mr.Yuck
what is the car being used for? If you aren't frag racing dropping the hammer at 6k the 8.75 will be fine. If it makes you feel safer back brace it. Looks like a road racing car, a dana adds weight. My old 440-6 Charger went 11.20's @ 121+ had a 8.75 and 3.91's no issues at all. That was much more than 450...not too mention the added torque of a 440.


Well it’s a car that is a “jack of all trades and a master of none”. It has a full interior and tips the scale at 3900 lbs. Once a year on the strip and once on an auto cross. Never slicks. Has to be suited for out of state road trips. It is not shown at car shows but frequents regional cruise ins. It sometimes gets hammered pretty good on the streets when the coast is clear. It needs to gain the respect of serious car people whether at Mopar events, the Hot Rod Power Tour or Good Guys.

The hp and tq of the current small block will be increased to the goal of 450 for each power measurement hopefully after the rear end improvement. I am slow about making improvements since it is just a hobby but I will spend a little more dough to make the improvement the right one and not cheap out.


‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
Re: 8 3/4 vs. Dana 60 [Re: an8sec70cuda] #2683187
07/31/19 07:17 PM
07/31/19 07:17 PM
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Originally Posted by an8sec70cuda


Backbraces and billet caps for an 8.75 are "feel good" parts. May make you feel better, but do nothing to keep it from shredding the ring and pinion.


Except the end result of a failed cap is, a "shredded ring and pinion".


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: 8 3/4 vs. Dana 60 [Re: jcc] #2683190
07/31/19 07:30 PM
07/31/19 07:30 PM
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3900 lbs and manual trans will not be the issue. UNLESS its spends a lot of time on the drag strip

its when you pop a set of slicks on it and drop the hammer is when it will be testing the 8-3/4 's limits

for me personally it would come down to gear choices. And theres not much for the Dana in something street / hiway friendly
But with an OD trans and a set of 3.54';s may not be bad for longer drives

Re: 8 3/4 vs. Dana 60 [Re: gtx6970] #2683191
07/31/19 07:36 PM
07/31/19 07:36 PM
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Pattison Texas
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Originally Posted by gtx6970
3900 lbs and manual trans will not be the issue. UNLESS its spends a lot of time on the drag strip

its when you pop a set of slicks on it and drop the hammer is when it will be testing the 8-3/4 's limits

for me personally it would come down to gear choices. And theres not much for the Dana in something street / hiway friendly
But with an OD trans and a set of 3.54';s may not be bad for longer drives


Dr Diff has 3.23 for the D60

Last edited by csk; 07/31/19 07:37 PM.

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: 8 3/4 vs. Dana 60 [Re: dfsmopars] #2683201
07/31/19 07:59 PM
07/31/19 07:59 PM
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Bend,OR USA
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Originally Posted by dfsmopars
[quote=
The hp and tq of the current small block will be increased to the goal of 450 for each power measurement hopefully after the rear end improvement. I am slow about making improvements since it is just a hobby but I will spend a little more dough to make the improvement the right one and not cheap out.

That is one of the best ways to save time, effort and money up Some people never learn this shruggy
Do it correctly ,ONCE up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 8 3/4 vs. Dana 60 [Re: gtx6970] #2683223
07/31/19 09:00 PM
07/31/19 09:00 PM
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Kentucky
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Originally Posted by gtx6970
for me personally it would come down to gear choices. And theres not much for the Dana in something street / hiway friendly
But with an OD trans and a set of 3.54';s may not be bad for longer drives


The 3.55s in the 8.25 now are a bit too long. They were great with a 42RE I had in the car earlier but with the Tremec 70 mph and it’s only turning 1800 rpm. With the small block I have to wind it up to about 2000 rpm to leave from a stop light and not have to wait for the engine to take forever to catch up in order to shift to second. If that makes any sense.

I had a Tremec six speed with 4.10s in another car that was great. That’s why I think 3.91s would be a good gear with this five speed.

Can 3.91s be found for a Dana?


‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
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