2:73 spacer?
2:73 spacer? I was reading and if i put different gears in my car and the car came stock with 2:73s then i need to buy a spacer. i was just wondering how i would know wether it did nor not. Its a 2000 M6 z28 and im going to be putting in gm 4:10s thanks guys.
TECH Resident
Joined: Oct 2005
Posts: 781
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From: Taxme, Ohio
Yeah, the 2 series carrier is 5/16 of an inch shorter. If you want to keep that carrier and use 3 series gears then you either have to use the spacer or buy special gears that are specifically designed for the 2 series carrier.
To find out if you have 2.73:1 gears you can do several things. The easiest is to look for the correct RPO code in your glove box. I think the 2.73 is GU2. The next easiest way is to raise the car and mark the drive shaft. Rotate it until the wheels make exactly one revolution. Note how many times the drive shaft had to turn including a portion of a turn. If it was less than 3 then you have a 2.73 if slightly more then it's a 3.23 or 3.42. Almost 4 turns is a 3.73 and four full turns with a little extra is 4.10. The last and hardest check is to remove the axle cover and count teeth on the pinion and ring. Do the math and you will know for sure.
Your M6 did not come with a 2.73:1. If you have a factory M6 with unchanged gears then you are running a 3.42 like the rest of us.
Factory installed 2.73:1 were only available to A4s which excludes the 1 on the automatic shifter console. In other words, it shows 2 - 3 and D whereas 3 series cars have 1-2-3-D ....
To find out if you have 2.73:1 gears you can do several things. The easiest is to look for the correct RPO code in your glove box. I think the 2.73 is GU2. The next easiest way is to raise the car and mark the drive shaft. Rotate it until the wheels make exactly one revolution. Note how many times the drive shaft had to turn including a portion of a turn. If it was less than 3 then you have a 2.73 if slightly more then it's a 3.23 or 3.42. Almost 4 turns is a 3.73 and four full turns with a little extra is 4.10. The last and hardest check is to remove the axle cover and count teeth on the pinion and ring. Do the math and you will know for sure.
Your M6 did not come with a 2.73:1. If you have a factory M6 with unchanged gears then you are running a 3.42 like the rest of us.
Factory installed 2.73:1 were only available to A4s which excludes the 1 on the automatic shifter console. In other words, it shows 2 - 3 and D whereas 3 series cars have 1-2-3-D ....
Thanks alot for that information i will do that check this weekend but my car is a stock M6 so i do not need a spacer then? Your information was very strait forward and threw thanks alot 01z28m6.
Originally Posted by 01Z28M6
Factory installed 2.73:1 were only available to A4s which excludes the 1 on the automatic shifter console. In other words, it shows 2 - 3 and D whereas 3 series cars have 1-2-3-D ....
not always true. my 2.73 car has the 1-2-3-D shifter
