rear end?
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 39
Likes: 0
From: nebraska
Car: 87 pontiac fiero
Engine: 2.5 liter
Transmission: 5speed
Axle/Gears: dont care.
rear end?
i was just wondering if anyone knew for sure what my rear end gears are? its an 83 trans am....
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
Try this link: http://www.austinthirdgen.org/modules.php?name=TechData
click on the year/model for info
click on the year/model for info
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 39
Likes: 0
From: nebraska
Car: 87 pontiac fiero
Engine: 2.5 liter
Transmission: 5speed
Axle/Gears: dont care.
its a 305 with an auto trans, 3 spd overdrive, not sure if its a 700r4 or th350???? but its a posi, i think they all are???
how would anyone else know what you have if you don't. the best anyone could do is take a guess at what it left the line with 20+ years ago. if you want to know get under the car pull the cover and do the math.
Thread Starter
Junior Member
Joined: Dec 2006
Posts: 39
Likes: 0
From: nebraska
Car: 87 pontiac fiero
Engine: 2.5 liter
Transmission: 5speed
Axle/Gears: dont care.
hey..or howabout you just leave it at the last post before yours... i didnt want to climb under the car and take off the diff cover.. if someone knew what it already had, i didnt know they came with 15 million different rear ends.., i dont know much about this car cuz i just got it, so i came here to ask, maybe put in some info, instead of put down. i know my car has a 305 and i know it has a 3 spd overdrive i donbt know what tranny it is, cuz i dont know what they come with...
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Just count the bolts on the rear end, don't need to remove the cover. I would expect you to have the 10 bolt with 3.23 posi. Your transmission is called a 700R4. 3 forward gears with another gear called an Overdrive.
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Joined: Jul 1999
Posts: 17,271
Likes: 171
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
83 Trans Am with a 305 and automatic transmission depends if the engine is a LG4 (4BBL) or a LU5 (CFI).
The LG4 cars came with 3.23 gears
The LU5 cars came with 2.93 gears and got 3.23 gears with the G92 option.
The 1983 L69 Trans Am only came with a manual tranny and got 3.73 gears.
Look at your RPO list.
That's all assuming your diff or what's in your diff is still original. In the last 24 years, anything could have been changed.
The LG4 cars came with 3.23 gears
The LU5 cars came with 2.93 gears and got 3.23 gears with the G92 option.
The 1983 L69 Trans Am only came with a manual tranny and got 3.73 gears.
Look at your RPO list.
That's all assuming your diff or what's in your diff is still original. In the last 24 years, anything could have been changed.
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