8 3/4 rear vs trans brake ????
#3098967
12/02/22 03:40 PM
12/02/22 03:40 PM
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Joined: Sep 2003
Posts: 19,534 north of coder
moparx
OP
"Butt Crack Bob"
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OP
"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,534
north of coder
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the transmission i have ready to put in my charger has a reverse manual valve body, and also a trans brake. the car has the original 8 3/4 rear under it with 3.91 gears and the original drive shaft with the vibration ring at the front yoke. should i even consider hooking up the trans brake ? rear tire size has not been decided on yet, but something around a 12.50 x 29 is being considered. my gut feeling is not to use the brake until the rear and driveshaft have been upgraded. the converter is a 4200 stall unit, so it should work ok foot braking it ? what say the people that are way smarter than this old dummy ? TIA !
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Re: 8 3/4 rear vs trans brake ????
[Re: CSK]
#3098985
12/02/22 04:21 PM
12/02/22 04:21 PM
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Joined: Jan 2003
Posts: 20,201 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,201
Park Forest, IL
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You may find out you need the brake hooked up to have reverse. My Griner I have to push the brake button to back up.
"Everybody funny, now you funny too."
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Re: 8 3/4 rear vs trans brake ????
[Re: slantzilla]
#3098991
12/02/22 04:37 PM
12/02/22 04:37 PM
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Joined: Jan 2003
Posts: 11,723 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,723
Portage,michigan
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I have a brake in mine. Year ago I broke the ring gear at the hit footbraking it. Tore every tooth off. Installed new Moser center section with nodular case, billet adjusters. Raced it last year off the foot, no issues. Next offseason going to buy S60, then I will use the brake. Don’t dare right now, and am making couple engine upgrades this current offseason. Hoping to get one more season out of this new 3rd member off the foot. Kinda bass ackwards to what I should be doing..rear should have come first
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 8 3/4 rear vs trans brake ????
[Re: topside]
#3099023
12/02/22 05:58 PM
12/02/22 05:58 PM
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Joined: Dec 2013
Posts: 4,694 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,694
Wichita
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Hahaha!
Transbrake in front of an 8 3/4..
Hahahahahaahah.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: 8 3/4 rear vs trans brake ????
[Re: humpty]
#3099089
12/02/22 10:13 PM
12/02/22 10:13 PM
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Joined: Jan 2003
Posts: 8,174 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,174
Plymouth, MI
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How much power?
Slicks are easier than radials but I broke *a lot* of stuff with a 4 speed in my 68 Charger. Multiple 8 3/4 centersections, axles, driveshaft… and it didn’t make much power.
A soft converter and slicks will help but it’s still asking for trouble.
My current C body is making 600-ish on nitrous, weighs 4300 and I’m footbraking it. I fully expect to break an 8 3/4 this coming season just because of the weight so I’m already saving for a 9” or Dana.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: 8 3/4 rear vs trans brake ????
[Re: Cab_Burge]
#3099339
12/03/22 10:12 PM
12/03/22 10:12 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Transbrake vs 8-3/4….. transbrake wins every time.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: 8 3/4 rear vs trans brake ????
[Re: moparx]
#3099395
12/04/22 08:28 AM
12/04/22 08:28 AM
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Joined: Jan 2003
Posts: 2,931 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,931
A shed in England
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Here's what I've found over the years.
1: 8 & 3/4" rears break. 2: You can still bust a Dana with just a footbrake. 3: Softer "Pro Gears" will help. 4: Dana parts and rear ratios are getting harder to find. 5: 9" based rears built to your spec are available as a virtual bolt in.
You can see where I'm going with this. I have a similar list for 727's - TH400's.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: 8 3/4 rear vs trans brake ????
[Re: moparx]
#3099399
12/04/22 08:53 AM
12/04/22 08:53 AM
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Joined: Jun 2014
Posts: 3,218 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,218
Md.
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I friend of mine is running one in a Vega, yes a Vega granted it's not heavy, but he uses a T brake and it's a big tire car.mid 9's. He modified the housing with big bolts to support the bearing caps. Hundreds of passes. Gear change when needed.
America First!
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Re: 8 3/4 rear vs trans brake ????
[Re: StealthWedge67]
#3099430
12/04/22 11:04 AM
12/04/22 11:04 AM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
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Transbrake vs 8-3/4….. transbrake wins every time. The 8 3/4 may win a battle or two, but the trans brake will win the war! LOL
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