Hello i have a 1984 firebird trans am it had the 305 ho l69 in it with a 700r4 today i tryed to see what my gear ratio was in my car but on my axel tubes i can not finde where it is stamped i have looked on the frount of the axel tube on the pasagner side by the carior and its not there dose anyone know where this migbe be hidding and if so can you pleace help me out i cant look on my RPO sheet cause it is missing also

 

you can always jack up the back of the car, put the tranny in neutral and count the amount of turns of the drive shaft it takes to turn the rear wheel ones.

but most people dont like that method

you could pull the diff cover and count the teeth on the ring and pinion gears and do the math, or sometimes its stamped into the ring gear. It never hurts to change your rear dif oil, alot of people overlook it during maint. Don't forget posi additive if required.

 

The following FAQ should provide some insight:

https://www.thirdgen.org/forums/tran...-10-bolts.html

IIRC, 84 was the only year for the L69 and autos. The manuals got 3.73's, but it "seems" to me that the autos got 3.42's.

JamesC

 

My 84 Trans Am had 3.73 with the 700R4. Many of the 84 f-bodies equipped with the L69 was usually matched to 3.73 regardless of which transmission. However that doesn't mean someone didn't change it or order the car with something different.