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**swervin ervin** · 02-06-2007, 05:55 PM

TUM is a 2.73 ratio. Standard rear axle only means what GM considered standard for each year, or something close to that anyway. Somebody explained this before in great detail. I just can't remember who it was. 2.73 was standard in 85 also.

On another subject, have you thought about reducing the size of your photos. A lot of folks on here are on dialup and it kills them to open threads like this one.

02-06-2007, 05:55 PM	#19
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Re: Rear End Id, Tranny Id? TUM is a 2.73 ratio. Standard rear axle only means what GM considered standard for each year, or something close to that anyway. Somebody explained this before in great detail. I just can't remember who it was. 2.73 was standard in 85 also. On another subject, have you thought about reducing the size of your photos. A lot of folks on here are on dialup and it kills them to open threads like this one.