Help figuring gear ratio
Thread Starter
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Joined: Jun 2005
Posts: 77
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From: Marathon Wisconsin
Help figuring gear ratio
Trying to figure out the gear ratio on a replaced rear end. I don't see anything stamped in the bottom of the pumpkin but the drive shaft spins 2 1/2 times for every 1 turn of the tire so what would that mean??
Instructor
Joined: May 2001
Posts: 186
Likes: 0
From: Midwest
That would mean 2.5:1 ratio, trying to remember if there were any factory ratios close to that, like 2.57:1, if so that is what you have.
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
The 2.59 :1 geared Dana 36 Rear diff was optional or standard depending upon years from what I read in the past here on C4 in the archives.
1st was available in 1985.
80 or so were installed in that year.
LT-1 guys hate the 2.59 with Autos.
Engines want to wind out but that gear holds back.
Likely work best in TPI cars.
I am selling 1 of those 2.59 Dana 36's complete from a 1989 Vette.
62,000 original miles on it.
No one wants it of course. LOL
Everyone is drag or roadrace happy once again with slight drop in Gasoline prices.
I bought it for a backup for my 87 Vert in case I ever blew out the stock 2.73 dana 36.
Still has not let go.
Gasoline prices were sky high back in the summer of 2008.
Another reason I picked it up.
BR
1st was available in 1985.
80 or so were installed in that year.
LT-1 guys hate the 2.59 with Autos.
Engines want to wind out but that gear holds back.
Likely work best in TPI cars.
I am selling 1 of those 2.59 Dana 36's complete from a 1989 Vette.
62,000 original miles on it.
No one wants it of course. LOL
Everyone is drag or roadrace happy once again with slight drop in Gasoline prices.
I bought it for a backup for my 87 Vert in case I ever blew out the stock 2.73 dana 36.
Still has not let go.
Gasoline prices were sky high back in the summer of 2008.
Another reason I picked it up.
BR
Melting Slicks
Joined: Jun 2002
Posts: 2,705
Likes: 30
From: Chesapeake Beach Maryland
2015 C5 of Year Finalist
The 2.59 :1 geared Dana 36 Rear diff was optional or standard depending upon years from what I read in the past here on C4 in the archives.
1st was available in 1985.
80 or so were installed in that year.
LT-1 guys hate the 2.59 with Autos.
Engines want to wind out but that gear holds back.
Likely work best in TPI cars.
I am selling 1 of those 2.59 Dana 36's complete from a 1989 Vette.
62,000 original miles on it.
No one wants it of course. LOL
Everyone is drag or roadrace happy once again with slight drop in Gasoline prices.
I bought it for a backup for my 87 Vert in case I ever blew out the stock 2.73 dana 36.
Still has not let go.
Gasoline prices were sky high back in the summer of 2008.
Another reason I picked it up.
BR
1st was available in 1985.
80 or so were installed in that year.
LT-1 guys hate the 2.59 with Autos.
Engines want to wind out but that gear holds back.
Likely work best in TPI cars.
I am selling 1 of those 2.59 Dana 36's complete from a 1989 Vette.
62,000 original miles on it.
No one wants it of course. LOL
Everyone is drag or roadrace happy once again with slight drop in Gasoline prices.
I bought it for a backup for my 87 Vert in case I ever blew out the stock 2.73 dana 36.
Still has not let go.
Gasoline prices were sky high back in the summer of 2008.
Another reason I picked it up.
BR
However, sometimes I wish I could cruise down the highway at 75mph and only see the tachometer at 2500 RPM again. That's why the new Corvettes with a 6speed automatic are pretty sweet.
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Instructor
Joined: May 2001
Posts: 186
Likes: 0
From: Midwest
Some guys who had automatics that regularly participated in autocrossing and drags switched to the Dana 44 assembly with 3.45 gears that came standard in most of the 6-speed manual cars. Besides the stronger assembly, the gearing was a good compromise for street and performance, especially in the LTX engines. It was a fairly easy conversion.
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
