8.75 Vs. 9" // Moser Vs. Strange

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roccodart440

roccodart440

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If your plan is to write something about the Dana 60, please leave this thread now.

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I need to buy a new complete rear.

Here are the choices...

Fabricated 8.75 with back brace, 33 spline, Eaton trutrac, Willwood Discs.

or....

Ford 9", 35 spline, Detroit Locker, Wilwood discs

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So my questions are...

1. Pro's and cons between 8.75 and 9"

2. Quality of parts and service between moser and strange
 
The ford is a better choice since it uses a rear bearing on the pinion so it's supported both front and rear, keeping things where they need to be. Also the price is a consideration.
 
I don't think you can beat the Ford 9" setup.

A lot of the locals use Strange since they are in the area. I have heard some crying about axle replacement turn around times though.
 
furyus2 said:
The ford is a better choice since it uses a rear bearing on the pinion so it's supported both front and rear, keeping things where they need to be. Also the price is a consideration.
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Although I posted the price it's not the end all be all to my decision.
 
furyus2 said:
The ford is a better choice since it uses a rear bearing on the pinion so it's supported both front and rear, keeping things where they need to be. Also the price is a consideration.
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Good thing the Ford has a rear pinion bearing. If it didn't it'd snap the pinion off pretty easy with it's puny pinion shaft diameter and low mounting position that puts more strain on the pinion

Roccodart just curious about your statement about the Dana. Don't like them, or is it a price issue?

If you do go 9" don't forget there's also Currie's to check prices with.
 
I am a big fan of the 8.75. It's strong and it's Mopar. Either brand will suffice.
 
How fast is it you plan on running?
How much power is the engine making?
How heavy is the car?
 
There is a big difference in streetablilty between the Locker and the TruTrac. The TruTrac will help hard cornering the Locker might bring the rear end around.
 
fishy68 said:
Good thing the Ford has a rear pinion bearing. If it didn't it'd snap the pinion off pretty easy with it's puny pinion shaft diameter and low mounting position that puts more strain on the pinion

True, however strange is rating this for 2,000hp and as wel know there are many very fast cars using the 9".

Roccodart just curious about your statement about the Dana. Don't like them, or is it a price issue?

No gear swap ability. No quick servicability.

If you do go 9" don't forget there's also Currie's to check prices with.

Thanks, i'll look into this.
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RustyRatRod said:
I am a big fan of the 8.75. It's strong and it's Mopar. Either brand will suffice.
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I've always liked the 8.75 and i've never had one suffer catastrophic failure. Moser is telling me the weak link will be the gears in the 8.75.


rumblefish360 said:
How fast is it you plan on running?
How much power is the engine making?
How heavy is the car?
Click to expand...

10's, maybe 9's on spray.

Engine right now makes 500hp. After current mods (Laroy porting and roller cam) i'm told it should make 650hp. Add 200hp of spray. Spray won't be a ragular thing. Just for street racing and to get a WOW timeslip.

dodgedifferent2 said:
8 3/4 survived behind the hemi
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Which in stock trim wasn't very impressive. Rated 425hp. My father (60) used to have a 69 440 R/T back in the early 70's as well as a goat. The bone stock hemi's apparently werent' the god of all engines many think of them to be.

CUDA69 said:
There is a big difference in streetablilty between the Locker and the TruTrac. The TruTrac will help hard cornering the Locker might bring the rear end around.
Click to expand...

My car takes 30 MPH turns at 25...lol. Not really a concern, however if I ever go in a different direction the tru-trac gives me some flexability.
 
The reason I asked my questions were due to a freind of mine having a 8-3/4 in his all steel 69 Dart except the fiberglass hood that had a 500 inch Indy headed big roller cammed etc.... You get the picture. He wasn't fooling around with his street ride.

The car was heavy. The car ran into the 9's. How deep I forget. The 8-3/4 did break. The big enemy was weight. High rpm launches don't help with slicks but this is where he was at. The rear was unbraced with street gears, not pro gears. S/S springs were used. Off set IIRC.

Should the car be lightened and the rear strengthened and the launches not track brutal all the time, the 8-3/4 will live for a long time no doubt. If the plan is more racing the car while it retains full weight, I'd look to the Ford rear.

I also kind of agree with you statement on the HEMI rep. The real misconception is the 8-3/4 behind the "Street car" is OK for the track and it is clearly NOT good behind a big block or HEMI car that is NOT Fooling around and making big horse power.
It will do gone on the street with most build ups staying in the street.
MoPars rear of choice behind the HEMI was not the 8-3/4 but the Dana for a reason.
The Ford 9 will do fine in place of the Dana.

I think your path has been cleared.
 
rumblefish360 said:
The reason I asked my questions were due to a freind of mine having a 8-3/4 in his all steel 69 Dart except the fiberglass hood that had a 500 inch Indy headed big roller cammed etc.... You get the picture. He wasn't fooling around with his street ride.

My engine isn't at that level.

The car was heavy. The car ran into the 9's. How deep I forget. The 8-3/4 did break. The big enemy was weight. High rpm launches don't help with slicks but this is where he was at. The rear was unbraced with street gears, not pro gears. S/S springs were used. Off set IIRC.

My car is a 3500 RPm foot brake car. It weighs about 3200 with me in it.

Should the car be lightened and the rear strengthened and the launches not track brutal all the time, the 8-3/4 will live for a long time no doubt. If the plan is more racing the car while it retains full weight, I'd look to the Ford rear.
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It will see much more street driving than strip use.
 
Stay with mopar, 8.75 big bearing, truetrac & DR. Diff axles.

I would at least call the Doc., he is good at talking people into stuff and he knows both real well.
 
mopowers said:
How often do you plan on swapping gears? Is it something you're gonna do every time you go to the track?
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I could swear he said no comments about Dana 60's. For me, "not having" a third member axle is a big deal, even if I only swap gears every 5 years.
 
67Dart273 said:
I could swear he said no comments about Dana 60's.
Click to expand...

Considering these are the only to mentions of the DANA rear, there far from comments. Just a question and a statement of ability.
So whats your point?

The Ford 9 will do fine in place of the Dana.
Click to expand...

Roccodart just curious about your statement about the Dana. Don't like them, or is it a price issue?
Click to expand...
 
backcountry800 said:
I would at least call the Doc., he is good at talking people into stuff and he knows both real well.
Click to expand...

I tried calling him with no success. I'll try again.


rumblefish360 said:
Considering these are the only to mentions of the DANA rear, there far from comments. Just a question and a statement of ability.
So whats your point?
Click to expand...

This is what he is talking about \/\/\/

mopowers said:
How often do you plan on swapping gears? Is it something you're gonna do every time you go to the track?
Click to expand...

Does it matter? Suppose I need to repair it?

67Dart273 said:
I could swear he said no comments about Dana 60's. For me, "not having" a third member axle is a big deal, even if I only swap gears every 5 years.
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This guy gets it /\/\/\
 
Backbraced 8 3/4,good axles,if you think you need more then get one of the nodular iron cases..to me the pros of the 8 3/4 is the best choice for all Mopars,you can change out gears by yourself in 30 mins,I know a guy with a 69 rr going into the hi 8's on spray never broke a housing or pumpkin,but has all the above and he runs a spool...not a fan of the overrated 'd' or the 9''...just my 2cents...also think the moser housing would be an excellent piece and really considering it...as for the hemi yes its a great legendary engine but give me a 440 anyday..and dollar for dollar well you can guess the rest....plus I've never seen or experienced a broken 8 3/4 set-up, unless it was wore out to begin with or set up wrong or improperly used by others[I've heard of such instances] then I must vote for 8 3/4 all the way...yes I know I will prob get beat up over this opinion but I dont give a damn it is twat it is
 
If your going spool and 35 axles I don't think it matters.

If it is what your doing with the car I'd go 9" Ford for sure, parts availability (new+used) and gear selection. Can't beat it cause everyone uses them.
 
After talking to Dr. Diff. I would never run a 9" in street trim. In race trim, yes, but not in street trim.

He claimed the ultimate weak link in the 8.75 will be the gears themselves. That and the 1,500$ extra price.
 
Another thing to think about is gear choice. Ford 9" has more choices than you could ever use and they are cheaper to build. Shoot try to find a 3.23 gear for an 8 3/4, they are just about obsolete.
 
i have the moser set up. nice stuff. i would look into the 8.75 rear but with ford ends. you get more choices with brakes on the rear that way.



 
Considering how quick you want to run and with spray I am liking the Dana more and more on this. I know. I broke the rules. Sorry. But for the 8.75 cost, you could approach having TWO Danas, one with a different ratio and just swap the whole rear out. That and the fact that I have seen both the 8.75 and 9" break where you are going. I think the Dana would hold up.
 
RustyRatRod said:
Considering how quick you want to run and with spray I am liking the Dana more and more on this. I know. I broke the rules. Sorry. But for the 8.75 cost, you could approach having TWO Danas, one with a different ratio and just swap the whole rear out. That and the fact that I have seen both the 8.75 and 9" break where you are going. I think the Dana would hold up.
Click to expand...

I won't hold the rule breaking against you, ;)

Young gun. That setup looks very very nice
 
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