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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2407891
11/23/17 03:38 PM
11/23/17 03:38 PM
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Joined: Jan 2003
Posts: 20,328 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,328
Park Forest, IL
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The simple answer is a 493 will kill an 8-1/4 in a short time, especially if it dead hooks, or spins then hooks.
"Everybody funny, now you funny too."
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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2407913
11/23/17 04:21 PM
11/23/17 04:21 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,637
fredericksburg,va
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Hope this helps, my 64 Plymouth with an almost dead stock LC 440 (509 cam) and a 3800 vert, 14-32 Firestones 4.88 gear ripped the teeth off an 8-3/4( all of them) with Strange axles and spool in 25 1/8 mile runs. I seriously doubt an 8-1/4 would've lasted that long. There are many factors in the equation, but tires, weight and RPM launch are the main ones you need to look at. Run it till it breaks (it will) then step up to the Dana and never think about it again. J
Last edited by cudaman1969; 11/23/17 06:03 PM.
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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2407930
11/23/17 05:10 PM
11/23/17 05:10 PM
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Joined: May 2015
Posts: 1,134 Lost in Time
Iowan
super stock
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super stock
Joined: May 2015
Posts: 1,134
Lost in Time
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Spend all you can on a 8.25 and it will not be as strong as a stock 8.75. Break it and take the trans out also.
Have a great day Iowan
"obsolete is neat"
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Re: 8 1/4 rear....what HP limts
[Re: Iowan]
#2408037
11/23/17 10:16 PM
11/23/17 10:16 PM
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Joined: Nov 2006
Posts: 1,462 oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,462
oklahoma
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Spend all you can on a 8.25 and it will not be as strong as a stock 8.75. Break it and take the trans out also. I agree
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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2408042
11/23/17 10:28 PM
11/23/17 10:28 PM
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Joined: Feb 2006
Posts: 608 TN
1DGEMAN
mopar
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mopar
Joined: Feb 2006
Posts: 608
TN
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Don't waste your money trying to make either an 8 1/4 or 8 3/4 live. Even a stock Dana 60 will out last them and probably for less money in the long run. Break a rear end and replace your slush box.
Real Men shift for themselves
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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2408275
11/24/17 03:21 PM
11/24/17 03:21 PM
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Joined: Jan 2011
Posts: 16,094 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 16,094
Central Florida
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But if you already have an 8.25 like some of us, and don't plan on racing it with tons of grip, it will last, so why spend on big bucks on the initial purchase of an 8.75 and doing the swap?
Facts are stubborn things.
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Re: 8 1/4 rear....what HP limts
[Re: dynamite]
#2408350
11/24/17 06:23 PM
11/24/17 06:23 PM
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Joined: Jan 2003
Posts: 2,931
Paul_Fancsali
master
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master
Joined: Jan 2003
Posts: 2,931
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A 8.25 rear end will last for long time with up to 300 rear wheel horsepower The torque of the 493 you have will kill it in short order if running slicks or 11.5 inch drag TA's like I did but up until then I had close o 800 runs including two trans explosions that took out trans and drive shaft split in two my 8.25 survived all that and broke the spider gears Open rear end Fixed it in parking lot and drove it home
Last edited by Paul_Fancsali; 11/24/17 06:23 PM.
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