Transmissions and Drivetrain Need help with your trans? Problems with your axle?

rear drum to disc

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Old Apr 21, 2007 | 12:17 AM
  #1  
Pontiackid's Avatar
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From: appleton,WI
Car: trans am ws6
Engine: something special :)
Transmission: T56
Axle/Gears: 4.10 posi
rear drum to disc

well i picked up a 373 rear end that is disc. currently my car has rear drum brakes. and i want to put these discs on, how do i go about doing this? thanks
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Old Apr 21, 2007 | 05:22 AM
  #2  
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: rear drum to disc

Swapping rears ends is the easiest; otherwise, you must mod the axel flanges. A will provide that info.

JamesC
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Old Apr 21, 2007 | 09:39 AM
  #3  
Pontiackid's Avatar
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From: appleton,WI
Car: trans am ws6
Engine: something special :)
Transmission: T56
Axle/Gears: 4.10 posi
Re: rear drum to disc

alright, well ill do a search, also im not sure what my car had in it before for gears, but with my new rear end its 373's. is my spedo going to be way off?
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Old Apr 21, 2007 | 09:43 AM
  #4  
JamesC's Avatar
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: rear drum to disc

Originally Posted by Pontiackid
with my new rear end its 373's. is my spedo going to be off?
Yes. A search should also tell you where you can purchase the appropiate speedo gears. I have no personal experience, but I've read that replacing those gears in an auto is fairly easy.

JamesC
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Old Apr 21, 2007 | 10:12 AM
  #5  
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From: appleton,WI
Car: trans am ws6
Engine: something special :)
Transmission: T56
Axle/Gears: 4.10 posi
Re: rear drum to disc

thanks jamesc. i know it cant be to hard, cause the new axle has all the discs and everything on it, i heard i just have to get some valve.

also i use to have 2.73's now 3.73's anyone know how far off i can expect it to be?
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Old Apr 21, 2007 | 04:51 PM
  #6  
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From: Nova Scotia
Car: 1984 Trans Am
Engine: 305
Transmission: Auto
Re: rear drum to disc

From a 2.73 to a 3.73 your speedo is going to read about 80 when you are actually doing about 60 mph.
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