Re: How much power can a 8.75 rearend handle?
[Re: Crock]
#1094421
10/14/11 07:34 PM
10/14/11 07:34 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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What will the car weigh... my opinion its weight that kills a 8 3/4.... this same question is asked ever other week.... you could try the search
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Re: How much power can a 8.75 rearend handle?
[Re: MR_P_BODY]
#1094422
10/14/11 08:27 PM
10/14/11 08:27 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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it can handle all of it right before it breaks !! , weight n hp as mr p says i would think, livable under 600 hp at the wheel, on a 3000@ car just guess ok i rethink that, if stock axels, and stock rear, under 450 hp i twisted axels on my volare with a basic stock 440 running 11.90 wiegth was 3560
Last edited by dennismopar73; 10/14/11 08:35 PM.
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Re: How much power can a 8.75 rearend handle?
[Re: DoctorDiff]
#1094424
10/14/11 10:17 PM
10/14/11 10:17 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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not everything, dana was an option on alot of the cars , and not all 440- 4 speed cars for sure, we ran deep into the 10 with stock rear ends, after market axles i even know couple guys running in the mid 11 with resplined , i do not recomend that for sure, had more issues with u joints than rears,
Last edited by dennismopar73; 10/14/11 10:21 PM.
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Re: How much power can a 8.75 rearend handle?
[Re: IcorkSOAK]
#1094426
10/14/11 10:34 PM
10/14/11 10:34 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
And then back-in-the-day ... MOST T/F cars had an 8 3/4 ... with 2500 hoes-power ....
BUT ... they never really hooked-up ...
I've been very happy with my 8 3/4... its a alum center now but I use to run a stock center with a stock cone posi....... and thats a 1.19 60'... but my car is light
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Re: How much power can a 8.75 rearend handle?
[Re: Mr.Yuck]
#1094428
10/14/11 11:17 PM
10/14/11 11:17 PM
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Joined: Jan 2007
Posts: 437 south central pa
bdaz smblk
mopar
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mopar
Joined: Jan 2007
Posts: 437
south central pa
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The 8 3/4 will take it but the 741 case is the weakest one you can get.
3120lb, small block, 10.5" tire, NA, through exhaust, full int, WITH 83/4 REAR, 9.0 at 150mph
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Re: How much power can a 8.75 rearend handle?
[Re: Mr.Yuck]
#1094433
10/15/11 10:19 AM
10/15/11 10:19 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
It will be fine that 6.1 doesn't make enough power to break that 8.75. I ran my junk to 11.39 w/ stock axles, stock ring/pinion no worries.
Same here all stock 8-3/4 but with my 493 I am starting to worry. When my funds let me I plan to go to a Dana. Ron
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Re: How much power can a 8.75 rearend handle?
[Re: 383man]
#1094435
10/15/11 10:46 AM
10/15/11 10:46 AM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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Say no to stock axles...yank em..and get aftermarket.. or youll be building a new car ... a broken axle will put you on your lid... Dont listen to anyone who says stock axles will be fine..if you can't afford $175.00 axles.. you cant afford to run the car..IMHO.. ive seen them break twist and sheer on 6cyl cars with slicks.. my fwiw..Im going 10.60's 3280lbs on a mark williams built 8.75 rear..
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]
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Re: How much power can a 8.75 rearend handle?
[Re: Crock]
#1094437
10/15/11 05:05 PM
10/15/11 05:05 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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Quote:
Let me clear up a couple things. My car originally was a slant 6 car with the 8.25. I remove it and replaced it with the 370ci 6.1 Hemi. First I had fun with the 8.25. and 293 ring and pinion the car was so fast on the top end that the car would float from side to side it was very scare but after that I upgraded to heavy duty springs and aftermarket pinion bump stop. I replaced the 8.25 with a friends 8.75 in a car he was taking to have crashed. I've already had trouble finding a stronger yoke for the 741 case. What is the strongest case out of the 741, 742, and 489? Is the 741 exterior its weak point and if so anything to help it or upgrade to a different case.
I plan on stroking the 6.1 to a 426ci hemi and adding the supercharger to create 600 hp to the rear wheels.
The car is a street car full interior so i estimate it weights 3600. Engine was 800 pounds out the crate. Currently has a 8.75 with 3.55 ring and pinion.
Axles, back braces anything else I need to strength this rearend. I already have rear disc brakes to stop this breast.
The 742 case is the best for hot rodding, a Dana 60 is way better If you must or insist on using the 8 3/4 rear buy a steel cap and a steel billet yoke for the pinion gear. Mu street car made 564 hp to the rear wheels on a Mustang chassis dyno with the 8 3/4 in it with 3.91 gears, i ended up breaking them, I broke a set of 4.10 and some other gear sets. I finally bent the housing so bad(no back brace)that it pulled the welds loose on the ladder bar mounts, I had a real hard time getting the right side axle out after it broke also, the right side is bent so bad from the center out to the backing plates you can see it I bought a used Dana 60 from a 3/4 ford pick up (3.1/4 thick diameter axle tubes ) and had it narrowed, put the ladder bars mounts back on it and put the Mopar axle bearing ends on it so I cuuld reuse the same brakes and axles I used a used set of dana Corp 4.10 and a new Strange Engr. 35 spline spool. My car(1971 Duster, original six cylinder witha pump gas 518 low deck stroker) car weighs 3450 with me inn it with teh 8 3/4, I haven't reweighed it since adding the Dana so it may weigh another 10 to 40 lbs now, probally around 20 lbs more The car pushes(by hand by me) way easeir than it ever did with the 8 3/4
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: How much power can a 8.75 rearend handle?
[Re: Crock]
#1094439
10/16/11 01:09 PM
10/16/11 01:09 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Let me clear up a couple things. My car originally was a slant 6 car with the 8.25. I remove it and replaced it with the 370ci 6.1 Hemi. First I had fun with the 8.25. and 293 ring and pinion the car was so fast on the top end that the car would float from side to side it was very scare but after that I upgraded to heavy duty springs and aftermarket pinion bump stop. I replaced the 8.25 with a friends 8.75 in a car he was taking to have crashed. I've already had trouble finding a stronger yoke for the 741 case. What is the strongest case out of the 741, 742, and 489? Is the 741 exterior its weak point and if so anything to help it or upgrade to a different case.
I plan on stroking the 6.1 to a 426ci hemi and adding the supercharger to create 600 hp to the rear wheels.
The car is a street car full interior so i estimate it weights 3600. Engine was 800 pounds out the crate. Currently has a 8.75 with 3.55 ring and pinion.
Axles, back braces anything else I need to strength this rearend. I already have rear disc brakes to stop this breast.
Mark Williams caps, back brace and after market axles... thats a heavy car to have a 8 3/4 live in
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