craig h

like the title says, i want to put 3.73 gears in my car. it's a 98 z28 m6 w/2.73's. which carrier do i have? which do i need? do i have to change the carrier? or can i use a ring gear spacer?

shtnfrds

iTrader: (1)

you have a 2 seires carrier and you can do 1 of three things.
1. you can buy thick gears for the 2 series carrier, i think strange sells them.
2. you can buy gears for a 3 series which are thinner, plus buy a ring gear spacer. it's cheaper to buy the thick gears by the way.
3. you can buy a new 3 seires carrier from any number of sponsers and the 3 seires gears for that carrier.

any of these will work.

redbird555

iTrader: (14)

Was your z ever swapped from an auto? Any m6 factory car should have GU6 on the door and thus have 3.42's in the back. Btw 4.10 is prolly a better gear for a manual because of the steep overdrive. 3.73 people usually use in autos.
Dan-

rob scott

iTrader: (14)

like redbird said, 4.10's are a better gear for the m6. Jaw gear's sells series 2 gears and their a sponser on here.

craig h

my car did have 3.42's in it. they were switched 2 owners ago. i think my speedometer is off by about 10-15 mph. when my speedo reads 75 mph at 1800 rpm's, i'm flyin buy by other cars ,feels like i'm doin about 85-90. am i crazy or has anyone else experiaced this?

gold98Z28

iTrader: (7)

well, from the factory you had a 3 seriers. but in order to get 2.73's i ASSume they changed it to a 2 series. i dont know if they make 2.73's for a 3 series or not

TransAmatt99

iTrader: (24)

I think that the 3.73's are plenty and it will keep you from revving high in 6th. I have them and you will be turning 2k @ 80mph.

ND2RACE

This man speaks the truth, and many places make the appropriate gears.
Yes a M6 should have come with 3.42s and a 3 series carrier, not sure why it doesn't have this but 2.73s cannot be installed on a 3 series. The whole reason for the difference in carriers is to make up for the difference in pinion size. A 2.73 pinion is huge so a 2 series carrier moves the ring gear away from the pinion center line, and a 3 series moves it closer. It's really pretty simple, for example a 4.56 pinion (biggest ratio that fits in a 10 bolt) is tiny and why it's prone to breaking. Some other bits of info to consider with such a small rear-end, not only does increasing the ratio multiply torque to the rear wheels, it makes the pinion smaller and weaker. I've seen quite a few broken pinions and all were from putting in bigger gears.

Personally I'd never go bigger then 3.73s in a 10-bolt, especially if you're making any power what so ever. These are also most of the reasons everybody upgrades from this worthless rear end in the first place.

gold98Z28

iTrader: (7)

oh i understand. ive built way to many of these little junk basterd. i just didnt know if by chance someone made a 2.73 for a 3series carrier. the ring gear would have to be awful thin but i think it could be possible, tho very highly unlikely

DAS1998

iTrader: (12)

Check Out Randy's Ring and Pinion

www.ringpinion.com