Unexpected rear ratio find -- HELP
04-18-2003, 11:56 AM
#1
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Unexpected rear ratio find -- HELP
Okay, I know one of the methods of checking rear end ratios is counting turns of driveshaft to turns of wheel (since I haven't actually pulled the diff. cover off to verify for sure), but what I got was very odd. I had 1 3/4 driveshaft turns to 1 turn of the rear wheel. Does this make any sense to anyone? Tell me my math is just all wrong, because this doesn't add up to anything that seems like a good number for rear ends...any help would be liberating to me right now! I know the rear end is stock, but don't have any RPO codes to referrence....it's a 1985 Trans Am Automatic with the LG4 motor rear drum brakes. Thanks!
04-18-2003, 12:13 PM
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Car: 4
Engine: 6
Transmission: 5
Sounds like only one rear wheel was turning.... in order for the turns-counting method to work, both rear wheels must turn exactly equally, as they would be if the car was driving down the road in a straight line
04-18-2003, 12:57 PM
#3
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Yes, I believe only 1 was turning...I was on my own at the time...I'll have to recruit my friend to help next time...does that mean mine's a one wheel wonder?? I sure wish I had a posi unit that I could rebuild... 
04-18-2003, 01:11 PM
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Car: 4
Engine: 6
Transmission: 5
Yup. One-wheeler.
Screw the various "approximation" methods; just pull the cover and look. This is why I tell people that, over and over again, but nobody listens; all these other things, from counting turns to "codes" to looking up the options a given car came with, are all full of possibilities for error. The one and only absolutely certain thing is to look at what's inside there; the parts cannot tell a lie.
Screw the various "approximation" methods; just pull the cover and look. This is why I tell people that, over and over again, but nobody listens; all these other things, from counting turns to "codes" to looking up the options a given car came with, are all full of possibilities for error. The one and only absolutely certain thing is to look at what's inside there; the parts cannot tell a lie.
04-18-2003, 01:24 PM
#5
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Yeah, I'm beginning to agree with you there....Heck, 10 bolts and a little fluid isn't too hard to do to get accurate results. Will the ratio be punched in an easy to see spot? I know they punch the pinion and ring tooth count in them, separated by a colon, so I know what I'm looking for, but I don't know if it is easily visible or if I have to search really hard. It's on the outside of the ring gear, correct? I'm all for doing that this weekend. I'll post and let you know what I find....
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