Hitman's Pontiac Trans Am Forum

Trans Am Information => Trans Am Information => Topic started by: transamfan on March 22, 2007, 10:42:52 PM

Title: Rear End Code Location?
Post by: transamfan on March 22, 2007, 10:42:52 PM

Just wondering what rear end my car has and I don't know where to look for the code at.  Thanks. 

I have a 79 if that matters at all.

Title: Re: Rear End Code Location?
Post by: Gold78Spc on March 22, 2007, 10:53:32 PM

Ya know I am just dying to answer that question, but I am afraid that it's not the one you are looking for.  ;D ;D ;D

Title: Re: Rear End Code Location?
Post by: eroc022 on March 23, 2007, 06:56:47 PM

stamped into the left side of the rear axle shaft....usually about a foot away from the pumpkin part...

Title: Re: Rear End Code Location?
Post by: transamfan on March 23, 2007, 07:54:45 PM

I just looked and still can't find it.  When you say left hand side, do you mean drivers side?  Would it be on the side near the back of the car, or the front of the car?  All I could find were some numbers, 7 or 8 digits it looked like.  They were not on the shaft though. 

Title: Re: Rear End Code Location?
Post by: eroc022 on March 23, 2007, 08:35:55 PM

oh on the back of the car side, driver side about 12 inches from the pumpkin, there should be some other numbers there too

Title: Re: Rear End Code Location?
Post by: John Witzke on March 23, 2007, 09:44:29 PM

The axle code, which is a two-character code, is stamped on the front passenger side axle tube to the left of the carrier case.  For example, axle code PX G70621 found on a 1977 Trans Am would be deciphered as; PX = Ring Gear size, G = Manufacturer, Chevrolet Gear and Axle, 062 = Julian date which is the 62nd day of 1977 or March 1, 1977, 1= is the shift when built, in this case 1st shift. 

Title: Re: Rear End Code Location?
Post by: transamfan on March 24, 2007, 01:24:29 PM

I have looked all over that thing and I have found some numbers on the carrier case, drivers side, front of the car side.  It's hard to read because they're upside down but it is either:

J254333
or
1254333

Probably means that a new rearend was put in the car somewhere along the road?  If this is the case, how can I figure out what gears I have before I decide on what cam to go with?

Title: Re: Rear End Code Location?
Post by: eroc022 on March 24, 2007, 05:41:06 PM

Quote

Probably means that a new rearend was put in the car somewhere along the road?  If this is the case, how can I figure out what gears I have before I decide on what cam to go with?

jack up the back axle and turn the wheels, mark a spot on the wheel and driveshaft....count how many times the driveshaft goes around till your wheels are back where you started at...and thats a VERY close gear ratio

Title: Re: Rear End Code Location?
Post by: transamfan on March 25, 2007, 10:05:37 PM

Thanks, I'll try it.