'77 differential ratio
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
Someone asked this either yesterday or two days ago, in the "General" forum.
http://forums.corvetteforum.com/show...5&forum_id=119
http://forums.corvetteforum.com/show...5&forum_id=119
Last edited by I'm Batman; Mar 10, 2006 at 01:21 PM.
Pro
Joined: Jan 2006
Posts: 599
Likes: 0
From: New York
Originally Posted by tomtcat
where the heck can i find out what ratio my rear end has.looked all my repain manuals,vin number,ect.
is it stamed somewhere on the pumpkin?
any help??
is it stamed somewhere on the pumpkin?
any help??
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Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
gtr, I tried that test today...all I learned is that my tach jams up at 2500 rpm. In any other 10mph jump, it increases several hundred RPM...after it hits 2500 (around 55-60 mph), it just sticks. Reads about 2575 at 70. 
Judging by the engine sound, I think I probably have 3.38 or 3.55 gears. It's wound up too tight at 65 to be running 2800 rpm...if the increase is fairly constant, it should be reading about 3000 rpm at 65.
Judging by the engine sound, I think I probably have 3.38 or 3.55 gears. It's wound up too tight at 65 to be running 2800 rpm...if the increase is fairly constant, it should be reading about 3000 rpm at 65.
Last edited by I'm Batman; Mar 12, 2006 at 11:05 PM.
Instructor
Joined: Jul 2000
Posts: 173
Likes: 0
From: Pumpkin Center CA
Originally Posted by tomtcat
where the heck can i find out what ratio my rear end has.looked all my repain manuals,vin number,ect.
is it stamed somewhere on the pumpkin?
any help??
is it stamed somewhere on the pumpkin?
any help??
Determining the rear axel ratio:
jack-up rear safely and use stands
make visible line on drivshaft (to count rotations)
make visible line on one tire (to count 10 rotations)
have assistant count the rotations of the driveshaft while you make 10 rotations of the tire.
divide the driveshaft rotations by 10
31 by 10 = 3.1 probably 3.08 gear
41 by 10 = 4.1 probably 4.11 gear
45-1/2 by 10 = 4.55 probably 4.56 gear