Who are the various manufacturers specifically for the 9in? Strange, Moser, KTRE...

Opinions are welcome on experience with each...good or bad.

 

currie also makes them i believe.

 

I have a Moser 9" with 35 Spline Axels and Detroit Locker. I personally like it very much. I didn't have any problems installing it, it bolted right up with minimum effort. I've heard of some people having to reset the spring perches and move stuff around, but mine went right in with no problems..

Dave @ Tenacious can qutoe you on one if you are interested.. They are an advertising vendor on here..

www.tenperf.com

--Sean

 

Thanks Sean...It's good to hear your experience with Moser was a good one. From the reading I've been doing here it sounds as though quite a few have had quality issues and various levels of customer service. I'm up the air still...I though that Strange had a bolt in solution and was ready to go that route but I can only find info on 12-bolts from Strange.

I'll have to look into the Currie...anyone have experience with them?

 

Just called Strange...no 9in bolt-in for f-bodys

 

i have a moser 9" - 350 gear for third gen
35 spline axels , spool w/nodular case , ford ends
& i bought the wildwood brake kit
bolt in was great - no problems

i live near strange - they only make 12 bolt bolt ins

 

Yep, it's lookin more and more like Moser is the only option for a bolt-in solution. I called Strange only to find that they don't have a 9in for the car. Strange recommended I call Currie. Currie has a solution but does not support using the fbody brake system which I would prefer to do.

So, on to ordering my Moser...Tell me if this sounds like a decent way to go. I want this to support at least 600rwhp.

Moser 9in
35 spline axles
Diff - I'm on the fence here, I don't have to drive the car everyday. I thought I had decided to go with a detriot locker but I'm seeing that alot of us are going with a spool. What's the disadvantage of going with a spool, mini spool, full spool???

gears - taking suggestions here. Right now I have run a 11.82@121 on the stock 3.42s but have always had trouble getting a decent 60ft time (best of 1.85). I only run the 1/4mi as far as track runs go. My tranny is also the 93 M29 with has a different ratio for 1st and 3rd. 3.73s feel like 4.10s with this tranny. Most running 93s with the M29 say to stay away from the 4.10 as it makes 1st gear useless. My biggest goal now is to get some daylight under the front tires as I just reached my ET goal of 11s...I'm not really interested in top speed...just G-forces.

 

Sorry to derail but what clutch and tires are you running on your stock rear to run 11s? very nice

 

I ran the 11.82 on Nitto DRs (275/60/15). Clutch is a Spec stage III. I guess I can't leave out the fact that I broke my 3rd 10-bolt later the same day as I ran the 11. Was just getting the launch down real good but 2nd gear + 100 shot = boom. Spider gears in pieces, see pics below.

another busted diff - pics

 

You don't need 35-spline axles. 33-spline will be fine. Spool on a street or street/strip car? Some people do it, but I think that's nuts. Power oversteer on a 3,500+lb car on the street would be an "unforgettable" experience if it caught you unawares. Get an Eaton posi with 800# springs.

Rich

 

I chose the 35 spline based on the calculator on Moser's site.

the only spec I wasn't 100% sure about is my 1st gear ratio. I used the following values in the formula.

Torque (ft. lbs.): 500
First Gear Ratio: 2.97
Rearend Gear Ratio: 3.70

clicked on the "Calculate" button and got the following.

Calculated Torque (ft. lbs.)* = 4945

Then I read further on the site and found this.

Should you be concerned about breaking an axle?
To achieve maximum performance you should use the smallest axle available that will safely handle the torque your car produces.


The torque rating of Moser Engineering Custom Alloy Axles are as follows:

30 Spline - 6,200 ft. lbs. (per axle)
31 spline - 7,000 ft. lbs. (per axle)
33 spline - 8,200 ft. lbs. (per axle)
35 spline - 9,600 ft. lbs. (per axle)
40 spline - 12,000 ft. lbs. (per axle)

Which axle size is right for me?
The way to pick your axles is so one axle will handle all of the maximum torque your car can produce. That way it is practically impossible to break an axle because you have at least a 200% safety factor.





By the way it sounds, I should go with 35 spline to meet the recommendation that one axle can handle everything. Also, I put it in as 500tq which will be going up. I don't want to buy another set of axles and a new diff to support future power upgrades...at least for a while.

 

Would it be wise to go with the aluminum center section?

 

If your calculated torque is 5000lbs the table indicates 30-spline as more than adequate. 35-spline is WAY bigger (and heavier) than you need.

Rich

 

So is this statement from their website false?

 

No, but you are misinterpreting it. You have ~5000lbs of torque in 1st gear. A single 30-spline is rated for 6,200. Since "the way to pick your axles is so one axle will handle all of the maximum torque your car can produce" a single 30-spline axle can handle more than the maximum torque your car can produce and is therefore adequate. Two 30-spline axles can handle more than twice your maximum, thus giving the 200% safety factor referred to. IOW, one axle should be able to handle the maximum and two, twice the maximum.

Rich