Will 8.8 Rear Out Of 89' Cougar Work In 89' Bird With 7.5 Rear????? - TCCoA Forums
 
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post #1 of 10 (permalink) Old 08-20-2003, 12:07 AM Thread Starter
 
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Will 8.8 Rear Out Of 89' Cougar Work In 89' Bird With 7.5 Rear?????

I BLEW OUT MY REAR DOING DOUGHNUTS THE OTHER DAY SO I GOT ONE OUT OF AN 89 COUGAR FROM THE JUNKYARD, THE ONLY DIFFERENCES I SEE IS THAT THE COUGAR HAD AN 8.8 REAR END WITH DISC BRAKES, AND MY BIRD HAD A 7.5 REAR WITH DRUM BRAKES. WILL THESE DIFFERENTIALS MATCH UP WHEN I GO TO SWAP THEM??
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post #2 of 10 (permalink) Old 08-20-2003, 10:46 AM
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yes, its a DIRECT bolt in.
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post #3 of 10 (permalink) Old 08-20-2003, 03:34 PM Thread Starter
 
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SO, HAVE YOU DONE THIS BEFORE, OR HAVE YOU JUST HEARD THAT THEY BOLT RIGHT UP?
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post #4 of 10 (permalink) Old 08-20-2003, 06:25 PM
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Many of us here have replaced/swapped centersections (pumpkins) quite a few times. As rancher said, it's a bolt in.

-Rod

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post #5 of 10 (permalink) Old 08-28-2003, 05:17 PM Thread Starter
 
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GOOD NEWS, THE 8.8 WENT IN WITH NO TROUBLE!!! WHAT ARE THE DIFFERENCES BETWEEN THE 7.5 AND 8.8 REAR END? WHAT DO THE NUMBERS ACTUALLY MEAN?
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post #6 of 10 (permalink) Old 08-28-2003, 05:25 PM
 
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Just one thing dude, turn the caps lock off, please.
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post #7 of 10 (permalink) Old 08-28-2003, 09:24 PM
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Quote:
Originally posted by BirdMan89
WHAT DO THE NUMBERS ACTUALLY MEAN?
7.5 = 7.5" ring gear

8.8 = 8.8" ring gear

-Rod

Rod @ AzzKicker Cars
[email protected]
90 XR7-The Meth Addict-KB SC'd 5.0L DOHC Stroker
2004 Mustang GT-The Driver-Intake/Exhaust/3.73's
1995 F150 4x4-The Mud Toy-5.0L/4R70W/33's/Warn 8274 Winch
94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
2 - 90 35th Anny Ed SC's
And a TON of parts cars!
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post #8 of 10 (permalink) Old 09-03-2003, 08:43 PM
 
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Also, the 8.8" will handle quite a bit more torque than the 7.5" will.

But you have already tested the TQ limits of the 7.5"!!!!!!

68COUGAR
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post #9 of 10 (permalink) Old 09-03-2003, 09:07 PM
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Quote:
Originally posted by BirdMan89
SO, HAVE YOU DONE THIS BEFORE, OR HAVE YOU JUST HEARD THAT THEY BOLT RIGHT UP?
Were you referring to Rancher?

I found that post quasi-humorous.

JH
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post #10 of 10 (permalink) Old 09-03-2003, 09:46 PM
 
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Both 7.5" and 8.8" ring gear varieties are equipped with 28-spline axles, thus a direct fit. 7.5" is worthless for performance use. A stock 5.0 175 horse engine will generally destroy this assembly with little effort. 8.8" is an awesome piece, it will last you through a lot of abuse. The axles can be easily recognized by the inspection covers. The 7.5 has only two straight sides, top and bottom, the 8.8 is basically a square with rounded corners. Unless you have a posi 3.55 gears are the max you should have on open rear.
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