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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> need gear ratio
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Topic Review (Newest First)
11-20-2011 06:40 PM
Centerline Should be a Ford 9" rear which is practically indestructible. I'm guessing it is an open rear (non posi) so what user151 says is the correct way to check the gear ratio. The best way is to jack up the passenger's rear tire (right rear) since that is the drive wheel, and make sure you have some sort of chalks holding the front tires so the car won't roll off the jack. With the trans in neutral rotate the tire twice and count the driveshaft rotations. That will give you the ratio. If he can't turn the wheel at all or if it is very difficult to turn he might have a posi rear, in which case you'll need to jack up both rear wheels and turn either wheel one revolution to get the gear ratio. I'm guessing since the tag is still there it has the stock 3.10 gear set which as has been mentioned is a little tall for an overdrive trans, however he can have the gear set changed to something a little more OD friendly pretty easily.

Centerline
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11-20-2011 06:35 PM
cobalt327
Quote:
Originally Posted by Buckeye Bob
my friend just called me & ask me if i could find out what his gear ratio is
he said that the tag was 3.10 he has a 59 ford retracktable with a v8
what can i tell him
The tag indicates it's a 3.10:1 ratio. But things sometimes get changed through the years and so to be sure you need to check the ratio.
11-20-2011 02:46 PM
user151
Quote:
Originally Posted by EMWOLBS 23t
only other way that he can check without pulling cover or rearend is to spin the rear wheel one complete revolution and count driveshaft revolutions that will give you a good indication as to what it is ,,three complete rev,of the driveshaft and a little past it to one complete spin of the rear tire will tell you if it is a 310 ?? old school ????
If you jack up one wheel, you must turn it two times, and count the driveshaft revolutions.
I'm assuming it's not a locker or limited slip...
11-19-2011 06:45 PM
35terraplane
Need gear ratio

Quote:
Originally Posted by Buckeye Bob
how good of a rear is that 3:10 ? my friend is puting a 5.0 w/aod in his 59 retracktable
Not very good with the AOD. he should have around 3.7 or up.

Bob
11-19-2011 06:14 PM
Buckeye Bob
310 rear

how good of a rear is that 3:10 ? my friend is puting a 5.0 w/aod in his 59 retracktable
11-17-2011 06:17 PM
EMWOLBS 23t only other way that he can check without pulling cover or rearend is to spin the rear wheel one complete revolution and count driveshaft revolutions that will give you a good indication as to what it is ,,three complete rev,of the driveshaft and a little past it to one complete spin of the rear tire will tell you if it is a 310 ?? old school ????
11-17-2011 05:49 PM
gmc1990rodder
Quote:
Originally Posted by Buckeye Bob
my friend just called me & ask me if i could find out what his gear ratio is
he said that the tag was 3.10 he has a 59 ford retracktable with a v8
what can i tell him
Tell him that unless someone has changed the rearend he has a 3.10 gear ratio!!
11-17-2011 05:41 PM
Buckeye Bob
need gear ratio

my friend just called me & ask me if i could find out what his gear ratio is
he said that the tag was 3.10 he has a 59 ford retracktable with a v8
what can i tell him

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