|
Next: Coolant/Antifreeze Type
|
| Author |
Message |
External
Since: Feb 14, 2006
Posts: 22
|
(Msg. 1) Posted: Fri Nov 09, 2007 4:22 pm
Post subject: Ratio of Overdrive w/T-86
Archived from groups: alt>autos>studebaker (more info?)
|
|
|
Anybody know if all the Studebaker overdrive units the same? V8-6 ? I have
a 3speed in my Avanti (factory) with dealer added overdrive. I know the gear
ratios in the T-86 as they are in the Avanti shop manual, but am trying to
find the ratios in the OD..Want to change the rear end gears to make it more
highway friendly. Has a 5.50 in it now and even in OD raps up too high for
good highway cruise and gas milage. About 3400 to 3600 and 55 mph.
Any easy way to figure the OD into the equation without trial and errror
switching ring and pinion until it works. I've been told that the factory
std. 3.31 would work but that is what the book says for just the 3sp. Any
help would be appreciated. I've got a chance to buy a set of NOS 3.73 gears.
Thanks
Dave B
--
"63 Avanti R1493 3sp. o/d |
|
| Back to top |
|
 | |
External
Since: Aug 01, 2007
Posts: 30
|
(Msg. 2) Posted: Fri Nov 09, 2007 4:22 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
On Nov 9, 3:02 pm, "Paul Johnson" <thejohns... DeleteThis @frontiernet.net> wrote:
> "mcavanti" <collec... DeleteThis @netconx.net> wrote in message
>
> news:15e96$4734dd95$c98ccf4$7404@NETCONX.NET...
>
> > Anybody know if all the Studebaker overdrive units the same? V8-6 ? I
> > have a 3speed in my Avanti (factory) with dealer added overdrive. I know
> > the gear ratios in the T-86 as they are in the Avanti shop manual, but am
> > trying to find the ratios in the OD..Want to change the rear end gears to
> > make it more highway friendly. Has a 5.50 in it now and even in OD raps
> > up too high for good highway cruise and gas milage. About 3400 to 3600
> > and 55 mph.
> > Any easy way to figure the OD into the equation without trial and errror
> > switching ring and pinion until it works. I've been told that the factory
> > std. 3.31 would work but that is what the book says for just the 3sp. Any
> > help would be appreciated. I've got a chance to buy a set of NOS 3.73
> > gears.
>
> Most Studebaker V-8s w/overdrive use a 3.73 which will give you about 2200
> rpm at 65mph. I can't even imagine a 5.50. If your speedometer reads
> reasonably accurately with that ratio, you will have to change the
> speedometer gear and pinion both to make the speedometer work.
> Paul Johnson
Jack up one rear wheel, leaving the other on the ground.
Turn the drive shaft until the wheel turns exactly two turns, counting
the number of D-S turns it takes.
Unless I have figured it wrong, this gives you the ratio you have now.
I assume that you have already noted what RPM you're turning at 60
MPH.
What RPM do you want to be turning at 60 with the new RE?
Do the math and figure out what ratio you want. (If you want lower RPM
at 60, it will be a lower number - lower than 3.73, if that'ss what
you have now, as Paul suggests.)
I'm going on vacation ("from what?" you say), so don't bother me if
I'm wrong. |
|
| Back to top |
|
| |
External
Since: Feb 09, 2004
Posts: 434
|
(Msg. 3) Posted: Fri Nov 09, 2007 7:55 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
"mcavanti" <collector DeleteThis @netconx.net> wrote in message
news:15e96$4734dd95$c98ccf4$7404@NETCONX.NET...
> Anybody know if all the Studebaker overdrive units the same? V8-6 ? I
> have a 3speed in my Avanti (factory) with dealer added overdrive. I know
> the gear ratios in the T-86 as they are in the Avanti shop manual, but am
> trying to find the ratios in the OD..Want to change the rear end gears to
> make it more highway friendly. Has a 5.50 in it now and even in OD raps
> up too high for good highway cruise and gas milage. About 3400 to 3600
> and 55 mph.
> Any easy way to figure the OD into the equation without trial and errror
> switching ring and pinion until it works. I've been told that the factory
> std. 3.31 would work but that is what the book says for just the 3sp. Any
> help would be appreciated. I've got a chance to buy a set of NOS 3.73
> gears.
Most Studebaker V-8s w/overdrive use a 3.73 which will give you about 2200
rpm at 65mph. I can't even imagine a 5.50. If your speedometer reads
reasonably accurately with that ratio, you will have to change the
speedometer gear and pinion both to make the speedometer work.
Paul Johnson >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
External
Since: May 07, 2004
Posts: 759
|
(Msg. 4) Posted: Fri Nov 09, 2007 9:56 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
The Studebaker overdrive unit gave a 30% overdrive. I'd go either
3.73 or 4.09 rear ratio for something that is still zippy but will
give a more friendly cruising RPM.
The 3.73 gears will not fit in your existing rear end. 4.09 should
fit. The housing is the same but the thickess of the flange on the
center carrier is different and the ring and pinion gears will not be
in the correct position if you try to put 3.73's in there.
On Fri, 9 Nov 2007 16:22:15 -0600, "mcavanti" <collector DeleteThis @netconx.net>
wrote:
>Anybody know if all the Studebaker overdrive units the same? V8-6 ? I have
>a 3speed in my Avanti (factory) with dealer added overdrive. I know the gear
>ratios in the T-86 as they are in the Avanti shop manual, but am trying to
>find the ratios in the OD..Want to change the rear end gears to make it more
>highway friendly. Has a 5.50 in it now and even in OD raps up too high for
>good highway cruise and gas milage. About 3400 to 3600 and 55 mph.
>Any easy way to figure the OD into the equation without trial and errror
>switching ring and pinion until it works. I've been told that the factory
>std. 3.31 would work but that is what the book says for just the 3sp. Any
>help would be appreciated. I've got a chance to buy a set of NOS 3.73 gears.
>Thanks
>Dave B
>
>--
>"63 Avanti R1493 3sp. o/d
>
>
Lee DeLaBarre
Daytona62 >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
External
Since: Nov 14, 2004
Posts: 258
|
(Msg. 5) Posted: Fri Nov 09, 2007 9:56 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
I can't tell you what gears fit your case, but the pure mathematics
(based on the
numbers you state for 5.5 gears) say you'd see about 2400 rpm at 55mph
in OD
with 3.73 gears and about 2100 rpm with 3.31 gears...
new cruise speed = 3500rpm times the new gear ratio divided by the 5.5
old ratio
Lee wrote:
> The Studebaker overdrive unit gave a 30% overdrive. I'd go either
> 3.73 or 4.09 rear ratio for something that is still zippy but will
> give a more friendly cruising RPM.
>
> The 3.73 gears will not fit in your existing rear end. 4.09 should
> fit. The housing is the same but the thickess of the flange on the
> center carrier is different and the ring and pinion gears will not be
> in the correct position if you try to put 3.73's in there.
>
>
>
>
> On Fri, 9 Nov 2007 16:22:15 -0600, "mcavanti" <collector.RemoveThis@netconx.net>
> wrote:
>> Anybody know if all the Studebaker overdrive units the same? V8-6 ? I have
>> a 3speed in my Avanti (factory) with dealer added overdrive. I know the gear
>> ratios in the T-86 as they are in the Avanti shop manual, but am trying to
>> find the ratios in the OD..Want to change the rear end gears to make it more
>> highway friendly. Has a 5.50 in it now and even in OD raps up too high for
>> good highway cruise and gas milage. About 3400 to 3600 and 55 mph.
>> Any easy way to figure the OD into the equation without trial and errror
>> switching ring and pinion until it works. I've been told that the factory
>> std. 3.31 would work but that is what the book says for just the 3sp. Any
>> help would be appreciated. I've got a chance to buy a set of NOS 3.73 gears.
>> Thanks
>> Dave B
>>
>> --
>> "63 Avanti R1493 3sp. o/d
>>
>>
>
> Lee DeLaBarre
> Daytona62 >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
External
Since: Jan 27, 2007
Posts: 337
|
(Msg. 6) Posted: Fri Nov 09, 2007 11:55 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
My PowerHawk has 2.92 gears w/ OD. It cruises at an even 2000 rpm at 60
mph and will yield 24-25 mpg.
JT
Lee wrote:
> The Studebaker overdrive unit gave a 30% overdrive. I'd go either
> 3.73 or 4.09 rear ratio for something that is still zippy but will
> give a more friendly cruising RPM.
>
> The 3.73 gears will not fit in your existing rear end. 4.09 should
> fit. The housing is the same but the thickess of the flange on the
> center carrier is different and the ring and pinion gears will not be
> in the correct position if you try to put 3.73's in there.
>
>
>
>
> On Fri, 9 Nov 2007 16:22:15 -0600, "mcavanti" <collector.TakeThisOut@netconx.net>
> wrote:
>
>>Anybody know if all the Studebaker overdrive units the same? V8-6 ? I have
>>a 3speed in my Avanti (factory) with dealer added overdrive. I know the gear
>>ratios in the T-86 as they are in the Avanti shop manual, but am trying to
>>find the ratios in the OD..Want to change the rear end gears to make it more
>>highway friendly. Has a 5.50 in it now and even in OD raps up too high for
>>good highway cruise and gas milage. About 3400 to 3600 and 55 mph.
>>Any easy way to figure the OD into the equation without trial and errror
>>switching ring and pinion until it works. I've been told that the factory
>>std. 3.31 would work but that is what the book says for just the 3sp. Any
>>help would be appreciated. I've got a chance to buy a set of NOS 3.73 gears.
>>Thanks
>>Dave B
>>
>>--
>>"63 Avanti R1493 3sp. o/d
>>
>>
>
>
> Lee DeLaBarre
> Daytona62 >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
External
Since: May 07, 2004
Posts: 165
|
(Msg. 7) Posted: Fri Nov 09, 2007 11:55 pm
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
My 59 Lark had the 259 with 3 speed and overdrive with a 3.54 rear gear. I
would cruise at 65 to 70 for hours and get around 18 to 20 mpg. That
included a 500 cfm Edelbrock 4 barrel carb. It was a real pressure to drive
out on the road. I never had a tachnometer so I don't know what rpm it was
turning.
Henry
"Grumpy AuContraire" <Grumpy RemoveThis @ExtraGrumpyville.com> wrote in message
news:QZ8Zi.10608$if6.7037@bgtnsc05-news.ops.worldnet.att.net...
> My PowerHawk has 2.92 gears w/ OD. It cruises at an even 2000 rpm at 60
> mph and will yield 24-25 mpg.
>
> JT
>
>
>
>
> Lee wrote:
>
>> The Studebaker overdrive unit gave a 30% overdrive. I'd go either
>> 3.73 or 4.09 rear ratio for something that is still zippy but will
>> give a more friendly cruising RPM.
>>
>> The 3.73 gears will not fit in your existing rear end. 4.09 should
>> fit. The housing is the same but the thickess of the flange on the
>> center carrier is different and the ring and pinion gears will not be
>> in the correct position if you try to put 3.73's in there.
>>
>>
>>
>>
>> On Fri, 9 Nov 2007 16:22:15 -0600, "mcavanti" <collector RemoveThis @netconx.net>
>> wrote:
>>
>>>Anybody know if all the Studebaker overdrive units the same? V8-6 ? I
>>>have a 3speed in my Avanti (factory) with dealer added overdrive. I know
>>>the gear ratios in the T-86 as they are in the Avanti shop manual, but
>>>am trying to find the ratios in the OD..Want to change the rear end gears
>>>to make it more highway friendly. Has a 5.50 in it now and even in OD
>>>raps up too high for good highway cruise and gas milage. About 3400 to
>>>3600 and 55 mph.
>>>Any easy way to figure the OD into the equation without trial and errror
>>>switching ring and pinion until it works. I've been told that the
>>>factory std. 3.31 would work but that is what the book says for just the
>>>3sp. Any help would be appreciated. I've got a chance to buy a set of NOS
>>>3.73 gears.
>>>Thanks
>>>Dave B
>>>
>>>--
>>>"63 Avanti R1493 3sp. o/d
>>>
>>
>>
>> Lee DeLaBarre
>> Daytona62 >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
External
Since: Feb 14, 2006
Posts: 22
|
(Msg. 8) Posted: Sun Nov 11, 2007 12:45 am
Post subject: Re: Ratio of Overdrive w/T-86 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
|
|
|
Thanks for all the imput. I did forget to mention it has TT. The only way I
could actually measure the MPH was with a stop watch and milemarkers as your
right, the speedometer was not accurate. I had the car on a hoist and used
the chaulk measure and that's why I think it has a 5.5. Again thanks.
Dave B.
--
"63 Avanti R1493 3sp. o/d
"mcavanti" <collector RemoveThis @netconx.net> wrote in message
news:15e96$4734dd95$c98ccf4$7404@NETCONX.NET...
> Anybody know if all the Studebaker overdrive units the same? V8-6 ? I
> have a 3speed in my Avanti (factory) with dealer added overdrive. I know
> the gear ratios in the T-86 as they are in the Avanti shop manual, but am
> trying to find the ratios in the OD..Want to change the rear end gears to
> make it more highway friendly. Has a 5.50 in it now and even in OD raps
> up too high for good highway cruise and gas milage. About 3400 to 3600
> and 55 mph.
> Any easy way to figure the OD into the equation without trial and errror
> switching ring and pinion until it works. I've been told that the factory
> std. 3.31 would work but that is what the book says for just the 3sp. Any
> help would be appreciated. I've got a chance to buy a set of NOS 3.73
> gears.
> Thanks
> Dave B
>
> --
> "63 Avanti R1493 3sp. o/d
> >> Stay informed about: Ratio of Overdrive w/T-86 |
|
| Back to top |
|
| |
FAQ
Profile
Private Messages
Log in
