12-bolt question

[Ric]

I'm looking at a rear end swap in the future, not so much to handle tons of power(yet), but more for reliability. I'm still leaning toward the 9" getup due to the press-fit bearings and other goodies, but can someone tell me the safe power limit of a 12-bolt behind a T56? Thank ye... uhh, thank ye vury muuuch.:nana:

[Zboner]

I'm looking at a rear end swap in the future, not so much to handle tons of power(yet), but more for reliability. I'm still leaning toward the 9" getup due to the press-fit bearings and other goodies, but can someone tell me the safe power limit of a 12-bolt behind a T56? Thank ye... uhh, thank ye vury muuuch.:nana:


a shit load 500hp maybe more, i have a 70 Chevelle with a 4 speed muncie and a 12 bolt rearend, i dump it at 4,500rpm's and i never think twice about it. i have never had any problems with it at all. but the Chevelle has about 350hp at most.

[Exotic Performance Plus]

We install a lot of Moser 12 bolt rearends behind boosted engines that give us 450 to 700 rwhp, and we have not had any problems yet. Bob

[J&J Speed Shop]

I'm looking at a rear end swap in the future, not so much to handle tons of power(yet), but more for reliability. I'm still leaning toward the 9" getup due to the press-fit bearings and other goodies, but can someone tell me the safe power limit of a 12-bolt behind a T56? Thank ye... uhh, thank ye vury muuuch.:nana:

Well unless you really need the easy change center section capability of the Ford 9" then I would suggest the 12 bolt. They are a bit cheaper, take less HP to turn because of the pinion angle, and are ultra durable. I have a customer that I just built a complete engine/combo for. He is making over 700 hp, through the T56 and a Moser 12 bolt

[bottlefed]

12 bolt sounds better

[Hurley711]

Thought the rule of thumb was 12 bolt for A4, 9 inch for M6....or is that just plain bullshit?

[J&J Speed Shop]

Thought the rule of thumb was 12 bolt for A4, 9 inch for M6....or is that just plain bullshit?

That is plain BS as far as I am concerned. I have many high HP customers running a Moser 12 bolt with T56 trannys. The only reason I would recommend a 9" to someone over a 12 bolt would be a full blown very high HP drag car, or someone who wanted the fast center section (gear) interchangability.

[Z95SSCLONE]

go strange 12 bolt!!!

[bww3588]

will the mosier or strange 12 hold up under a launch at the strip with tall stickies?

[J&J Speed Shop]

will the mosier or strange 12 hold up under a launch at the strip with tall stickies?

Both will hold, IMO the Moser is a heavier duty unit at the time I was evaluating both and seeing which one I wanted to sell and install. If you are thinking lots of drag lauches I would looking into the Detroit TrueTrac diff if you want a posi, all worm gear and no clutches to wear out

[Hurley711]

What is the usual total cost of everything needed with a new rear end. What else do you need besides the rear? Install estimates?