I just bought a spare Borg-Warner 9 Bolt. There's a tag on one of the bolts that says it has 3.27 gears. What do I need to take out to have these gears put in my 3.70 posi?
I'm not sure if the rear turns or not but then again the rotors are rusted solid, but then again, I only paid $20 for the rear

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

You want to go from 3.70 to 3.27?

 

Yeah, I hate being at 2250 at 60mph! And 19mpg!

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

can I buy the old gears (and shims to make life easy...)

 

What gear ratio do you want?

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

 

2250 at 60. Must be nice. My truck does 2800 at 60. 4.10 gears, 28" tall tires and 4L80E OD tranny.

Dropping from 3.70 to 3.27 would make highway driving better but stoplight driving will seem sluggish. My car had 3.27 gears and the previous owner pinned the speedo to 140mph with those gears. After some modifications I used those gears to get my best ET's so they're not as bad as you would expect.

Another thing you could consider is just installing a taller tire. That would have the same effect as changing the gears. The taller tire would put a larger contact patch on the ground and the 3.70 gears would give the torque multiplication to get the car moving. Factory tires are about 26" tall. Up to 28" tall will easily fit.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

I've considered all that, and still want to go thru with it. What do I have to take out of the old rear and about how much will it cost me to get it put in?
ALSo, someone I know told me that the 3.27's probably won't fit where the 3.70's were?
Anyone?

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

the 3.27 should fit and the posi should fit
hardest part for you is finding someone who will actually do it in usa

 

heh, i'm stupid so i'd probably be the one to jump on the task. Then again i break anything that gets in my way.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR