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

Reverse drum condition

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Old

Mar 4, 2020 | 07:54 PM

#1

Thread Starter

Member

Joined: Jul 2007

Posts: 239

Likes: 3

From: Utica NY

Car: 88 Trans Am

Engine: 305 TBI

Transmission: 700R4

Axle/Gears: 3:42 open diff

Reverse drum condition

I was wondering about the condition of the attached picture of my reverse drum. I don’t feel any ridges and everything feels smooth.

Old

Mar 5, 2020 | 01:11 PM

#2

Pro Built Automatics

Supreme Member

Joined: Jul 1999

Posts: 3,479

Likes: 54

From: Calimesa, California, U.S.

Re: Reverse drum condition

Clean the surface where the band rides and check it with a straight edge. If it dishes in the middle of where the band rides, then you need a new oem drum or a good used one that is "flat".

Old

Mar 5, 2020 | 05:40 PM

#3

Senior Member

iTrader: (4)

Joined: Jul 2011

Posts: 695

Likes: 73

From: New York

Car: 86 Sport Coupe

Engine: 5.3 LM7

Transmission: T56

Axle/Gears: 4th gen 3.42 posi

Re: Reverse drum condition

I had to replace it during the rebuild on my Tahoe’s 60e a few months back. If you see a gap of light under the straight edge like this replace it.

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