2.73 open to 3.42 posi - What should I expect
Thread Starter
Supreme Member
Joined: Apr 2004
Posts: 2,139
Likes: 0
From: MN
Car: 1986 Camaro SC (Supercool)
Engine: one composed of various metals
2.73 open to 3.42 posi - What should I expect
I know 'what' will change as far as ratios etc. But with never having a posi thirdgen and now having these gears, will I have a noticeable difference in the way the car takes off? Im getting a 10 bolt posi disc rear to replace my stock open 10 bolt....I have an LG4
, but still think that I should expect a little more umphh off the line....am I correct on this?
, but still think that I should expect a little more umphh off the line....am I correct on this? Supreme Member

Joined: Jan 2003
Posts: 2,043
Likes: 3
From: San Diego
Car: 1994 Trans Am
Engine: LT1
Transmission: Auto
Axle/Gears: 3.23
Night and day my friend. I don't know about going from 1-wheel-peel to 2, but I went from 2.73 posi to 3.42 posi. Best thing you can do w/o getting under the hood.
Thread Starter
Supreme Member
Joined: Apr 2004
Posts: 2,139
Likes: 0
From: MN
Car: 1986 Camaro SC (Supercool)
Engine: one composed of various metals
Im already pumped about the one wheel to two....specially with all that tread I have out back
....but Im glad to hear the gearing will be noticeable enough too
....but Im glad to hear the gearing will be noticeable enough too Supreme Member
Joined: Apr 2004
Posts: 1,002
Likes: 0
From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
I went from a 2.73 open to 3.73 posi...Night and day.. Im making somewhere in the market of 320-350hp so it was a huge difference for me, but you will definately feel 'umph'... its also nice not to be a one-wheel-wonder. If you ever get a more stout smallblock in there, expect to do a good amount of suspension work... cause my traction sux some major ***. If im not wheel-hopping off the line them i am fishtailing like im on snow. (never driven my car on snow btw)
Supreme Member

Joined: Jan 2003
Posts: 2,043
Likes: 3
From: San Diego
Car: 1994 Trans Am
Engine: LT1
Transmission: Auto
Axle/Gears: 3.23
Originally posted by Rabbitt
cause my traction sux some major ***. If im not wheel-hopping off the line them i am fishtailing like im on snow. (never driven my car on snow btw)
cause my traction sux some major ***. If im not wheel-hopping off the line them i am fishtailing like im on snow. (never driven my car on snow btw)
Thread Starter
Supreme Member
Joined: Apr 2004
Posts: 2,139
Likes: 0
From: MN
Car: 1986 Camaro SC (Supercool)
Engine: one composed of various metals
well I think I have the suspension area covered....just about complete aside from a tubi- torque arm which I wont both with until I do put some power under the hood. I guess I should make sure I dont push everything too hard since Im underpowered and stuck to the ground huh?
....well I do have a new video camera, so maybe a lil fun this summer
....well I do have a new video camera, so maybe a lil fun this summer
Supreme Member
Joined: Jul 2003
Posts: 1,236
Likes: 0
From: KY
Car: 87IROC, 740iBMW, 328iBMW, 86GMC
Engine: 5.7, 4.4LV8, 2.8, 6.0
Transmission: Manuals & Auto's
Axle/Gears: 3.27, 3.42
Originally posted by BigWhiteGTP
Best thing you can do w/o getting under the hood.
Best thing you can do w/o getting under the hood.
Trending Topics
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Dont forget to change the speedo gears in the transmission so your speedometer will work correctly.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 19
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
I noticed alot of difference in feel when I went from 2.73 to 3.08 in my 1990. When I went from 2.73 to 3.42 in my 1992, it was really great!
Supreme Member
Joined: Apr 2004
Posts: 1,002
Likes: 0
From: Boscobel, Wisconsin
Car: 1987 Iroc-Z
Engine: 355
Transmission: 700r4 w/ about 7500 miles on rebuild
Originally posted by Kevin91Z
Dont forget to change the speedo gears in the transmission so your speedometer will work correctly.
Dont forget to change the speedo gears in the transmission so your speedometer will work correctly.
Thread
Thread Starter
Forum
Replies
Last Post
UltRoadWarrior9
Transmissions and Drivetrain
3
Sep 2, 2015 08:24 PM









