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View Full Version : 60mph/3000 rpm what is my axle ratio?



63Avanti
12-22-2005, 10:53 PM
hi!
Curious about if my 63 R2 Avanti has the best axle ratio for highway travel.
Without taking off the rear plate and counting teeth, can someone
tell me what 4th gear 60 MPH at 6000 rpm is?

thanks!

Terry,
1963 Avanti R2, 63SR1065 http://sterkel.org/avanti
1985 Kubota L2202 (Diesel)
2000 VW Jetta GLS
2003 VW Jetta TDI (Diesel) http://sterkel.org/tdi

Roscomacaw
12-22-2005, 11:12 PM
I'll bite - is it 3000 RPM or 6000. If it's 6000, you've got a problem[}:)]
What size tires???

Miscreant at large.

1957 Transtar 1/2ton
1960 Larkvertible V8
1958 Provincial wagon
1953 Commander coupe
1957 President 2-dr
1955 President State
1951 Champion Biz cpe
1963 Daytona project FS

JDP
12-22-2005, 11:20 PM
Wow, 3000 at 60 MPH is going to be a 4.11, better double check.

Studebaker On The Net http://stude.com
64 GT Hawk
64 R2 4 speed Challenger
63 R2 4 speed GT Hawk
53 Street rod

Dick Steinkamp
12-22-2005, 11:31 PM
quote:Originally posted by tsterkel



hi!
Curious about if my 63 R2 Avanti has the best axle ratio for highway travel.
Without taking off the rear plate and counting teeth, can someone
tell me what 4th gear 60 MPH at 6000 rpm is?

thanks!

Terry,
1963 Avanti R2, 63SR1065 http://sterkel.org/avanti
1985 Kubota L2202 (Diesel)
2000 VW Jetta GLS
2003 VW Jetta TDI (Diesel) http://sterkel.org/tdi


The Dana 44 in your Avanti should have a metal tag under one of the rear cover hold down bolts that gives either the axle ratio or the number of teeth on the ring and the number on the pinion gear (divide the ring gear # of teeth by the pinion number of teeth to get the ratio), or both. If the tag has been removed, you can determine the axle ratio if you know (or can compute or measure) the rear tire diameter. Use a calculator such as this one...

http://mywebpages.comcast.net/rforceno/arc/arc.htm

If you are truly running 3000 RPM at 60 MPH you certainly don't have the best rear end ratio for highway travel. You have one of the worst. You do have, however, one of the best rear end ratios for acceleration from a stop.

-Dick-

JDP
12-22-2005, 11:56 PM
Oddly, N8 and I played with a R1 Powershift Avanti with a 4:11 rear. It was lots of fun to drive around town, but a PITA on the highway.

Studebaker On The Net http://stude.com
64 GT Hawk
64 R2 4 speed Challenger
63 R2 4 speed GT Hawk
53 Street rod

DilloCrafter
12-23-2005, 12:41 AM
Hi,
You need this great calculator page:
http://www.ring-pinion.com/content/calculators/RPM.asp

1955 1/2 Ton Pickup
http://rocketdillo.com/studebaker/misc/images/current_AvaCar.gif

DEEPNHOCK
12-23-2005, 07:56 AM
That is a neat page..Thanks!
Beats turning the driveshaft and watching the tire(s)[|)]
Jeff[8D]



quote:Originally posted by DilloCrafter

Hi,
You need this great calculator page:
http://www.ring-pinion.com/content/calculators/RPM.asp

1955 1/2 Ton Pickup
http://rocketdillo.com/studebaker/misc/images/current_AvaCar.gif


DEEPNHOCK at Cox.net
'37 Coupe Express
'37 Coupe Express Trailer
'61 Hawk
http://community.webshots.com/photo/42559113/426827941Lsvfrz
http://community.webshots.com/user/deepnhock

DEEPNHOCK
12-23-2005, 08:00 AM
Highway travel at 6 grand?!
You Avanti guys sure are, uh... optimistic;)
Jeff[8D]




quote:Originally posted by tsterkel


hi!
Curious about if my 63 R2 Avanti has the best axle ratio for highway travel.
Without taking off the rear plate and counting teeth, can someone
tell me what 4th gear 60 MPH at 6000 rpm is?

thanks!

Terry,
1963 Avanti R2, 63SR1065 http://sterkel.org/avanti
1985 Kubota L2202 (Diesel)
2000 VW Jetta GLS
2003 VW Jetta TDI (Diesel) http://sterkel.org/tdi


DEEPNHOCK at Cox.net
'37 Coupe Express
'37 Coupe Express Trailer
'61 Hawk
http://community.webshots.com/photo/42559113/426827941Lsvfrz
http://community.webshots.com/user/deepnhock

N8N
12-23-2005, 08:26 AM
60 MPH at 6000 RPM is first gear in my '62 :)

nate

(well, that is, if I could get it to hit 6000 RPM... it's all over by about 5200)

--
55 Commander Starlight
62 Daytona hardtop
http://home.comcast.net/~njnagel

GTtim
12-23-2005, 10:18 PM
Here's a calculator you can use to solve your problem if you know your car's tire height. I'm guessing that would be about 27 inches. That would indicate the axle ratio is a 4:11 if you were talking about 3000 rpms. There are lots of other calculators on this site as well. http://users.erols.com/srweiss/calcrgr.htm Now if you are really lazy, like me, and don't want to go out to the garage to measure your tires go here. http://www.sccoa.com/faq/tirecalc.html
Tim K.

monomaniac
12-25-2005, 02:22 PM
My first Avanti (automatic) had a 3.73 rear end ration and it was almost dead on 3000 rpm at 60. I drove it for over 2 years with the speedo not working because it was easy to calculate approximate speed. At 50 it read 2500 rpm; at 40 it was 2000 and so on.

Roscomacaw
12-26-2005, 01:26 AM
What did the tach read at 100 Art???[}:)]

Miscreant at large.

1957 Transtar 1/2ton
1960 Larkvertible V8
1958 Provincial wagon
1953 Commander coupe
1957 President 2-dr
1955 President State
1951 Champion Biz cpe
1963 Daytona project FS

big jim
12-27-2005, 01:17 PM
in the event the tag is missing..look on pass side axle tube on top
should be the bill number...usually 6 digit-1 or more digits this number will tell, with the help of the right spicer manual, everythimg about that axle. good luck with your project..
incidently what is the ser number of the car?