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Old 01-16-2008, 09:18 AM
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8.8 ford diff good/bad?

Hey,guys i have an 1984 ford pickup 1/2 ton and a 68' 390 with a C6 tranny.I was wondering how good a 8.8ford diff is and where on the third member case could I find a gear ratio?

Thanx, Your friend 427feracer

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Old 01-16-2008, 07:56 PM
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I've heard nothing but good things about the 8.8 rearends, it's supposedly a copy of the GM 12 bolt. They seem to be able to hold up to alot of HP in some seriously hopped up mustangs that I've seen drag racing.
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Old 01-16-2008, 08:18 PM
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some info;

http://www.badshoeproductions.com/rear.html#8

may help you , mayb not
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Old 02-08-2008, 11:23 AM
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RE:Gear Ratio

Quote:
Originally Posted by 427feracer
Hey,guys i have an 1984 ford pickup 1/2 ton and a 68' 390 with a C6 tranny.I was wondering how good a 8.8ford diff is and where on the third member case could I find a gear ratio?

Thanx, Your friend 427feracer
Its easy to find your gear ratio ,count the teeth on your pinion and then on the ring gear then divide the ring gear teeth by pinion teeth and you have your ratio.Example 30 teeth on ring gear 11 on the pinion 30/11=2.72 hope this helps
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Old 02-09-2008, 03:44 PM
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All of the 8.8's ive looked at have a tag on a passenger-side diff cover bolt. The bottom left of that tag has "#_##" or "#L##" if it has a locker from the factory. These three #'s are your gear ratio! Hope that helps!
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Old 02-09-2008, 07:44 PM
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This is the first time I use one,I will be putting it to the test.
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Old 02-09-2008, 08:15 PM
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turn the drive shaft

with both wheels off the ground turn the drive shaft and count times to get the wheels to turn over If only one wheel turns turn the drive shaft until the one wheel turns ove 2 times. that will give you the ratio. the hot mustang guys use a girdle for the bearing caps.
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Old 02-09-2008, 10:38 PM
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I heard of turning the two wheels together,And counting how many time the drive shaft turns.Make sure to mark the drive shaft. And that will give you your gear ratio
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Old 02-10-2008, 09:12 AM
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Put the car in neutral and jack up 1 wheel at the back, try and turn it. If it turns easily you either have an open diff or your limited slip is completely shot. Turn the wheel a bit so the u-joint on the driveshaft is pointing straight up and down, and mark a chalk line on the tire pointing straight down. Turn the tire two revolutions and count how many times the driveshaft turns. That is your ratio.

If you have a limited slip diff you will need to lift both wheels off the ground, and do it exactly like I said above but only turn the wheels one revolution.
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Old 02-10-2008, 09:26 AM
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I thought it was one turn.
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Old 02-11-2008, 06:59 AM
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One turn if it has posi, two if its open.
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Old 02-12-2008, 08:33 AM
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The 8.8 is pretty stout with a little help. #1 is to replace the stock plate diff cover with a stronger unit to stop the flex. Summit sells these pretty reasonably. For crazy torque numbers, you may consider a c-clip eliminator kit as well.
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