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Final Drive Ratio, #78034 06/21/08 10:29 PM 06/21/08 10:29 PM
Joined: Oct 2006 Posts: 216 united kingdom Simonic OP enthusiast
Simonic OP enthusiast Joined: Oct 2006 Posts: 216 united kingdom	I've recently put a sure grip in my superbee,i was told the ratio was 3.23 but never checked it. I'm pulling 3,000 rpm@65mph and am using a 15 inch rear wheel with a 275/60 tyre. Does this sound right for 3.23? Is there an easy way to heck the ratio without pulling the sure grip back out please? Keeping the Bee Buzzin'

Re: Final Drive Ratio, [Re: Simonic] #78035 06/21/08 11:25 PM 06/21/08 11:25 PM
Joined: Nov 2006 Posts: 840 southern Idaho M moparcyco super stock
moparcyco super stock M Joined: Nov 2006 Posts: 840 southern Idaho	Jack the car up put a mark on the tire and spin it around once and count how many times your driveshaft turns.That should get you close without pulling it.

Re: Final Drive Ratio, [Re: moparcyco] #78036 06/21/08 11:39 PM 06/21/08 11:39 PM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Quote: Jack the car up put a mark on the tire and spin it around once and count how many times your driveshaft turns.That should get you close without pulling it. that's the easiest and closest way to find out, without having to take the axle apart to inspect. Photobucket sucks

Re: Final Drive Ratio, [Re: moparcyco] #78037 06/22/08 12:27 AM 06/22/08 12:27 AM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	I have the same tire size, but run 3.55's. 3000@65 is about what mine does. But it also depends on converter, more converter slip = more rpm, so best is to jack up the car and check like said.

Re: Final Drive Ratio, [Re: DaytonaTurbo] #78038 06/22/08 12:34 AM 06/22/08 12:34 AM
Joined: Oct 2006 Posts: 216 united kingdom Simonic OP enthusiast
Simonic OP enthusiast Joined: Oct 2006 Posts: 216 united kingdom	Thanks gents,i'll give it a try Keeping the Bee Buzzin'

Re: Final Drive Ratio, [Re: moparcyco] #78039 10/18/08 12:05 PM 10/18/08 12:05 PM
Joined: Nov 2007 Posts: 103 Tampa, FL S Saint Crispan member
Saint Crispan member S Joined: Nov 2007 Posts: 103 Tampa, FL	Quote: Jack the car up put a mark on the tire and spin it around once and count how many times your driveshaft turns.That should get you close without pulling it. Ok, so I put a mark on the tire and on the driveshaft, and I spun the driveshaft about 2 and one half turns to get one rotation out of the tire. My "pumpkin" is the type that has the plate bolted on to the back of it, and it has drum brakes. The car is a 1972 Satellite (Plus), with a 400 and an automatic transmission. I think it's stock (except for having the intake on the block changed to a 4 barrel). With 2.5 turns on the driveshaft for each one turn on the wheel, would it be safe to conclude that the ration was 2.5:1? Is there such a ratio, standard? What is most likely the type of driveshaft I have? Is it 9&1/2"? Or 8&3/4"? Or even one I haven't heard of yet? Thanks in advance.

Re: Final Drive Ratio, [Re: Saint Crispan] #78040 10/18/08 12:18 PM 10/18/08 12:18 PM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit mopar
68Bullit mopar Joined: Mar 2008 Posts: 571 Western NC	Quote: With 2.5 turns on the driveshaft for each one turn on the wheel, would it be safe to conclude that the ration was 2.5:1? Is there such a ratio, standard? What is most likely the type of driveshaft I have? Is it 9&1/2"? Or 8&3/4"? Or even one I haven't heard of yet? Thanks in advance. You have a 2:76:1 (2.76's) If you driveshaft rolls the least bit past the 2 1/2 mark then I'd say you have 2.76's

Re: Final Drive Ratio, [Re: 68Bullit] #78041 10/18/08 03:18 PM 10/18/08 03:18 PM
Joined: Nov 2007 Posts: 103 Tampa, FL S Saint Crispan member
Saint Crispan member S Joined: Nov 2007 Posts: 103 Tampa, FL	Ah, thank you! BTW, I used to have a 1972 Charger SE (which came with a 318 and an automatic tranny). Somebody told me that the rear end was a 2.72, and it (like my Plymouth) had a plate on the "pumpkin" (is it called a pumpkin? Who came up with that, anyway?). Was there such a thing as a 2.72 rear end, and were they common for 1972 Dodge Charger SE's? BTW, thanks very much for answering! (Getting some intellectual itches scratched here...)

Re: Final Drive Ratio, [Re: Saint Crispan] #78042 10/18/08 05:51 PM 10/18/08 05:51 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	This might help. http://vexer.com/68rt/speed.html

Re: Final Drive Ratio, [Re: stumpy] #78043 10/21/08 12:44 AM 10/21/08 12:44 AM
Joined: Oct 2006 Posts: 216 united kingdom Simonic OP enthusiast
Simonic OP enthusiast Joined: Oct 2006 Posts: 216 united kingdom	Quote: This might help. http://vexer.com/68rt/speed.html Cheers What a fun (and useful)little program Keeping the Bee Buzzin'

Re: Final Drive Ratio, [Re: Simonic] #78044 10/21/08 10:07 PM 10/21/08 10:07 PM
Joined: Nov 2007 Posts: 1,522 Orleans, Ontario moparcanuk pro stock
moparcanuk pro stock Joined: Nov 2007 Posts: 1,522 Orleans, Ontario	I'm running a 3:23 with 275/60 15s and turn 2500rpm @ 60mph and 3000rpm @ 70mph.

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