Rear Ends...

[scotts83SS]

I am trying to find out what rear end and gears came in a stock 83 El camino conquista. If i remember correctly its a 7.5 in rear end but i really have no idea what gears came in the car. Thanks guys.

 

[jrm81bu]

Most likely it had 2.41's originally. There is a 3 digit code stamped in the front(i think) of the passenger side axle tube. Someone on here could probably decode it and tell you what it had. Although that doesn't mean somone hasn't changed them over the years. If you really need to know the best way is to pop the rear cover of and count the teeth.

 

[billyjack]

Standard gear was 2.41. 3.08 was optional, but rarely seen.

Bill

 

[scotts83SS]

Alright fellas thanks!

 

[Doober]

It may also have 2.29s if it's an auto, they had taller gears, manual-shifted cars had deeper gears (2.73, 3.08, etc.).

 

[Tuggy24g]

Yes it would be an 7.5 rear and it would be 2.73 or 3.08

 

[johnny79]

Look at your codes... I have a 2AH. 2.29 open rear, soon to be a 3.42 posi

    RPO           |--------Axle Code--------|
    Ring Gear   Code   Ratio   Conventional   Limited Slip
    -------------------------------------------------------
      7.5       G72    2.14       2AK            2BK   (aluminum brake drums)
      7.5       GH2    2.29       2AH            2BH
      7.5       GU1    2.41     2AJ,2AZ        2BJ,2BZ
      7.5       GM8    2.56       2AA            2BA
      7.5       GU2    2.73     2AB,2AX        2BB,2BX
      7.5       GU4    3.08     2AC,2AV        2BC,2BV
      7.5       GU5    3.23       2AD            2BD
      7.625     GT4    3.73       2TF            2TH   (Monte Carlo SS)
      8.5       GU6    3.42       3TP            3TJ   (T-Type, GN Std.)
      8.5       GT4    3.73     3TG,3TE        3TR,3TX (442, GN Opt.)

      8.5       GU2    2.73       8YB            8YP   (B-Body)
      8.5       GU4    3.08       8YD            8YR   (B-Body)
      8.5       GU5    3.23       8YE            8YS   (B-Body)

 

[scotts83SS]

Okay so I know most of this is personal preference/opinion but does anyone think that the 7.5 rear end can hold a fair amount of power with the right gears or is it better to just up grade the whole unit? I am thinking about doing a 9 inch with 3.90's but if people feel that the 7.5 can hold a fair amount of power then i might just do a gear swap.

 

[Doober]

You're on borrowed time with a bone stock rear. For the street you can build one and it will likely handle around 400-420hp fine, but you'll need all the upgrades... support cover, aftermarket axle shafts, and a good aftermarket posi/limited slip carrier.

 

[jimmyp618]

Just grab ya a JY 7 5/8 camaro or s-10 posi diff 3 series carrier, a set of moser 28 spline G/N axles cut the buttons back about 1/16" on pass side axle and your set.Mines done great so far for the last 1 1/2 yrs. 450-475 hp 525-500lbs torque 464 big block buick Track driven only so it takes alotta abuse. Hell Ive seen 10 sec cars with 7.5's peg legs welded up hold together lol. Its stupid but hey it works for em .