Re: rear end decisions
 

9 inch from moser is rated 1250 with 35 spline axles wavetrac no less.. Spool may rise the limit.. I bought a complete unit and love it. Works great.. no I live in world of 1/8 mile tracks and 5+ gear ratio's :)

Re: rear end decisions
 

That's not to bad. Mind sharing a price on your axle and all?

I just got a 70 c20 yesterday. Now I know it's 8 lug and I can't imagine it being to hard to switch to a 6 lug, but are the 3/4 ton axles stronger than a 1/2 ton? I'm hoping there's a way I can use it if it's a posi.

Re: rear end decisions
 

I am a dealer for these parts so no I cannot give you a cost other than retail. which you can look up on moser site.
I am running 6 lug rear wheels and 5 up front. Not like I can rotate the tires anyways . But you can get just about any bolt pattern and size you want. I am running 6 big studs vs 5 on the rear. In the end 5 is more than strong enough just something i wanted due to a issue with another race car I had.


GO to Moser and spec out what you want. Something like I have is not what most need. 33 spline pressed bearing vs timken etc it all adds up. When you go to 35 spline some things are a must in the ordering process like a nodular housing. certian type of axles and so on.

Direct fit no mods needed on my end what so ever..

On the axles if you are asking me about 12 bolt stuff I dont bother. My opinion is you are only waiting to break it and when you do the cost will be enough that a 9 inch would have already been paid for. I run my stuff double duty.. and its get the bottle on the street as well the track.

If that a track truck spool it and forget about the posi unit. But the stock axles are not long for this worl with heavy power and adding c clip ends aluminum rear support cover .. I went through that thats why I have a 9 inch now.

Re: rear end decisions
 

What is your fastest pass so far without a posi unit ? were you planning on spraying it with an open diff ?[/QUOTE]

R/T: .078
60': 1.972
1/8: 8.443
MPH: 83.02
1/4: 13.053
MPH: 100.56

I'm not exactly sure what my rear end is. I can do a burnout and the passenger tire spins, but I can do another burnout in a different location and the driver side tire spins. I know it's not a posi though. I've had a posi.[/QUOTE]

Even with a Posi unit the axles typically break at the splines . On a factory 12 bolt that allows the axle and brake drum to be free . A posi and C-clip eleminators are the minimum i would suggest for your stock axle be it 12 bolt 8.875 or 10 bolt 8.5 .

Re: rear end decisions
 

Hotrod posted up what I am saying..

Buy the c clip units, better axles a spool rear diff support new ring and pinion .. add that all up and you got a 9 inch he he

Re: rear end decisions
 

I have been seeing some good deals on used / new 12 bolt parts on some local FB pages here in this area.

Re: rear end decisions
 

Another source for a rear axle housing or rear end is DTS Drive Train Specialists in MI or WI. They make really strong rear end housings. DTS makes certain Mark Williams housings, they did a few years ago, not sure if they still do.

Like Keith S. I used upgraded stock 10 bolt into the 10s for a decade, now have DTS 12 bolt with chrome molly tubes, etc. and MWs insides, dual calipers each side with stainless steel single rotor [SS is lighter]. Dual calipers are for launching, not stopping. I am down on HP/torque to Keith only about 600/600, getting into the mid 1.30 60 foots.
Launch and stall in the 5s, think close to 2 gs at launch. And thats on radial 9 inch slicks light weight with over 25 PSI. Picture is with 10 bolt still in car.

Re: rear end decisions
 

I used my GM 10 bolt from my 85 truck and put new everything: I got 31 spline moser axles, auburn differential, 3:73 richmond gears, axle tubes welded and moser rear cover verus building a 9" rear in my truck less expensive for me atleast!!

Re: rear end decisions
 

It is about the intended use of the vehicle.. A nice 9 inch with a price tag of 3200 for a complete unit. like mine is going to handle more abuse that a built 12 bolt, and when the 12 bolt breaks ( pinion area is week ) you are going to be into the build for more than you would have up front with a 9 inch. 10 bolt i not a tough unit by any means and the do break. Now this is the performance section so take that for what it is. We are not taking it easy on the stuff in this section. high stall sticky tires NOS , turbos blowers etc. That type of use will show the weak link in a hurry. For a guy wanting a double duty the 9 inch lends itself there as its easy to swap entire center sections. So race season is a 4.13 gear and then you want a road trip easy swap the section out to a low dollar unit with 355 gears and cruise down the hwy. I opted for a 3.73 with .75 4th gear OD. I may look into a set of 4.10 gears.. Current is 70 MPH at 2450. A very happy middle of the road. Its all in how you look at it. Myself would not waste the money on the 12 bolt. As I have broke many and tough as they are they are not as strong as a 35 spline item that will handle 1000 HP + and never skip a beat. FB what do you have invested in that unit I would think at least 1500 closer to 1750 using retail plus the cost of the unit to start with as the early trucks had 8.2 ring and pinion . Look at what you will do with it then add 25% of the abuse factor and see where it lands :)