Re: What overdrive ratio? .64 .68 or .82?
[Re: AHall]
#144837
11/02/08 07:23 PM
11/02/08 07:23 PM
|
Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
|
I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
|
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
depends greatly on what your doing with the car, street, track, solo comp, etc,etc....what axle gear choice will you be using?...tire size?
my Tona' runs a 440/6 w Keislers .64 TKO 600/650, w a dana 60, running 4:10 gears, and a 27 inch tire......hi-way cruising at 70 mph is 2-2200 rpm (max MPG is 22 MPG).....max speed is 140ish MPH at around 5800 RPM......
ask this "guy" he knows! 
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: DAYCLONA]
#144838
11/02/08 10:17 PM
11/02/08 10:17 PM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
what are the other gear ratios? would first be deep enough to work with a 3.23 or 2.94? if so, get the .82, otherwise, I'd go with the .68 or .64.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: DAYCLONA]
#144839
11/02/08 11:40 PM
11/02/08 11:40 PM
|
Joined: Apr 2008
Posts: 423
DFW Texas
AHall
OP
mopar
|
OP
mopar
Joined: Apr 2008
Posts: 423
DFW Texas
|
Quote:
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
depends greatly on what your doing with the car, street, track, solo comp, etc,etc....what axle gear choice will you be using?...tire size?
my Tona' runs a 440/6 w Keislers .64 TKO 600/650, w a dana 60, running 4:10 gears, and a 27 inch tire......hi-way cruising at 70 mph is 2-2200 rpm (max MPG is 22 MPG).....max speed is 140ish MPH at around 5800 RPM......
ask this "guy" he knows!
Well it's a weekend cruiser that I take to the track once a month- goal is mid to low 12's with the car. (Car weighs 3900 lbs)
currently have a Dana 60 with 3.55's in it.
at 75 mph im currently taching 4500 rpm which isnt good long term on a 440 big block.
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: Twostick]
#144841
11/03/08 04:11 AM
11/03/08 04:11 AM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
|
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
my 383 stroker is really happy from 2200-2800 for steady cruising. with the TKO .64, 3.21 gears and 28.5" tire, I was doing 75 at like 1800 rpm. in the picture attached, I was just under 70 and rpms were about 1500. way too low! it would buck and surge at that rpm, so I couldn't use 5th gear until I was going faster than 75. not good in a state where the highest speed limit is 65! ...at least it was happy to do 60 in 4th gear at 2400 rpm. I swapped in 4.56s which will give me right at 2500 rpm at 75 mph with 28.5" tires. 
**Photobucket sucks**
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: AHall]
#144843
11/03/08 07:00 AM
11/03/08 07:00 AM
|
Joined: Aug 2005
Posts: 403
30 miles west of EuroDisney
fbernard
mopar
|
mopar
Joined: Aug 2005
Posts: 403
30 miles west of EuroDisney
|
.64 here, car is used for road racing.
As long as you don't need the 5th for racing, .64 is OK (I have a 3.55 rear ratio with 28" tires).
If I was racing really long tracks (or if I had longer gears), I'd have bought the 0.8 ratio. Right now, there's just one track on which I could have used a 5th gear (3/4 mile straight line).
The gear you need depends on whether you want a normal 5 speed or an OD.
Think of the .64 OD as a 6th speed with no 5th. That's exactly how it feels when using it. Skipping one gear. You have to rev higher in 4th before you shift, since there's a big gap between 4th and 5th (twice as much as between the other gears).
Having said that, I can cruise at the posted highway speed limit at 23-2400 RPM, or a bit lower around 2000 RPM.
When I have to drive on 55-limited roads though (90 km/h here), it's really exactly between 4th and 5th, and I have to stay in 4th (or drive slightly above in 5th, 60 is doable, around 1800 RPM).
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: fbernard]
#144844
11/03/08 10:54 AM
11/03/08 10:54 AM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
how big is your cam, etc? with 3.54's I'd look at the .68....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: AHall]
#144845
11/04/08 09:46 AM
11/04/08 09:46 AM
|
Joined: Feb 2006
Posts: 227
Tennessee
rj8806
enthusiast
|
enthusiast
Joined: Feb 2006
Posts: 227
Tennessee
|
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
The general rule of thumb when ordering a TKO is what rear gear ratio do you have currently? Typically a rear gear of 3.55 or taller and we would recommend a TKO-500. Gearing of 3.73 or shorter and we say TKO-600. The most important thing to remember is not rear gear ratios but rather when does your motor start to produce torque? If your motor doesn't start building torque until the 2000rpm mark, DON'T pick a tranny that will have you cruising down the highway at 1700rpm's.  This will make for a lugging, chugging, bucking ride and you won't be happy.
Personally, I like to have it where I am cruising at about 200-300rpms above where my motor starts to build torque. For instance, my daily driver starts building good torque at 2000rpm's. I picked a rear gear combination and transmission gearing that allows me to cruise at 2250-2300rpm's at 70mph in 5th. This gives me maximum gas mileage and performance at the same time. In fact, my stock gears were 3.27's. I went up to 3.55's just to match the 5th gear ratio in my trans. and I actually increased my gas mileage. This is in a 2000 mustang GT.
Rear gearing is important, the thing to remember when calling for a quote or help is to know when your motor starts to build torque. This will allow you to get a transmission package that you'll be happy with.
Richard
Tech Support
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: patrick]
#144846
11/04/08 11:24 AM
11/04/08 11:24 AM
|
Joined: Apr 2008
Posts: 423
DFW Texas
AHall
OP
mopar
|
OP
mopar
Joined: Apr 2008
Posts: 423
DFW Texas
|
Quote:
how big is your cam, etc? with 3.54's I'd look at the .68....
Engle K56.
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: rj8806]
#144847
11/04/08 11:28 AM
11/04/08 11:28 AM
|
Joined: Apr 2008
Posts: 423
DFW Texas
AHall
OP
mopar
|
OP
mopar
Joined: Apr 2008
Posts: 423
DFW Texas
|
Quote:
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
The general rule of thumb when ordering a TKO is what rear gear ratio do you have currently? Typically a rear gear of 3.55 or taller and we would recommend a TKO-500. Gearing of 3.73 or shorter and we say TKO-600. The most important thing to remember is not rear gear ratios but rather when does your motor start to produce torque? If your motor doesn't start building torque until the 2000rpm mark, DON'T pick a tranny that will have you cruising down the highway at 1700rpm's. This will make for a lugging, chugging, bucking ride and you won't be happy.
Personally, I like to have it where I am cruising at about 200-300rpms above where my motor starts to build torque. For instance, my daily driver starts building good torque at 2000rpm's. I picked a rear gear combination and transmission gearing that allows me to cruise at 2250-2300rpm's at 70mph in 5th. This gives me maximum gas mileage and performance at the same time. In fact, my stock gears were 3.27's. I went up to 3.55's just to match the 5th gear ratio in my trans. and I actually increased my gas mileage. This is in a 2000 mustang GT.
Rear gearing is important, the thing to remember when calling for a quote or help is to know when your motor starts to build torque. This will allow you to get a transmission package that you'll be happy with.
Richard
Tech Support
The motor is a built 440ci, stealth aluminum heads, K56 engle cam, headers, 3.55 Dana 60 rear, do I need the TKO 500 or TKO 600?
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: AHall]
#144848
11/04/08 11:41 AM
11/04/08 11:41 AM
|
Joined: Feb 2006
Posts: 227
Tennessee
rj8806
enthusiast
|
enthusiast
Joined: Feb 2006
Posts: 227
Tennessee
|
Quote:
Quote:
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
The general rule of thumb when ordering a TKO is what rear gear ratio do you have currently? Typically a rear gear of 3.55 or taller and we would recommend a TKO-500. Gearing of 3.73 or shorter and we say TKO-600. The most important thing to remember is not rear gear ratios but rather when does your motor start to produce torque? If your motor doesn't start building torque until the 2000rpm mark, DON'T pick a tranny that will have you cruising down the highway at 1700rpm's. This will make for a lugging, chugging, bucking ride and you won't be happy.
Personally, I like to have it where I am cruising at about 200-300rpms above where my motor starts to build torque. For instance, my daily driver starts building good torque at 2000rpm's. I picked a rear gear combination and transmission gearing that allows me to cruise at 2250-2300rpm's at 70mph in 5th. This gives me maximum gas mileage and performance at the same time. In fact, my stock gears were 3.27's. I went up to 3.55's just to match the 5th gear ratio in my trans. and I actually increased my gas mileage. This is in a 2000 mustang GT.
Rear gearing is important, the thing to remember when calling for a quote or help is to know when your motor starts to build torque. This will allow you to get a transmission package that you'll be happy with.
Richard
Tech Support
The motor is a built 440ci, stealth aluminum heads, K56 engle cam, headers, 3.55 Dana 60 rear, do I need the TKO 500 or TKO 600?
As I stated before, with a 3.55 rear gear, we would automatically recommend a TKO-500 based on ratios alone. Before I can give you a good educated answer, I need to know when the motor starts to build torque? 1700rpm? 2000rpm? 2500rpm? etc... This will help us decide which TKO would be better suited for your needs.
Richard
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: rj8806]
#144849
11/04/08 11:54 AM
11/04/08 11:54 AM
|
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
K56 looks to be a 224/224 @.050 cam, and unless they're stock loooow compression pistons, you're probably making decent compression, so I'm guessing you probably have good low RPM manners/torque, and not a lot of "cam surge". how tall are your tires? with your 3.54 ratio, and say, 27-28" tall tires (255-275/6015's) I'd go with a .68 OD. that'll make it very nice on the interstate, cruising in the 2000-2300 RPM range at 70mph, depending on tire size....2nd choice would be the .64, and then I'd maybe look at some slightly shorter tires (say, 26" tall, like a 295/50R15) if you experience any "cam surge" at cruise.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: rj8806]
#144850
11/04/08 12:08 PM
11/04/08 12:08 PM
|
Joined: Apr 2008
Posts: 423
DFW Texas
AHall
OP
mopar
|
OP
mopar
Joined: Apr 2008
Posts: 423
DFW Texas
|
Quote:
Quote:
Quote:
Quote:
Im ordering my TKO Tremec 5 speed transmission from Keisler, and need to pick an OD ratio. Which one do you recommend?
The general rule of thumb when ordering a TKO is what rear gear ratio do you have currently? Typically a rear gear of 3.55 or taller and we would recommend a TKO-500. Gearing of 3.73 or shorter and we say TKO-600. The most important thing to remember is not rear gear ratios but rather when does your motor start to produce torque? If your motor doesn't start building torque until the 2000rpm mark, DON'T pick a tranny that will have you cruising down the highway at 1700rpm's. This will make for a lugging, chugging, bucking ride and you won't be happy.
Personally, I like to have it where I am cruising at about 200-300rpms above where my motor starts to build torque. For instance, my daily driver starts building good torque at 2000rpm's. I picked a rear gear combination and transmission gearing that allows me to cruise at 2250-2300rpm's at 70mph in 5th. This gives me maximum gas mileage and performance at the same time. In fact, my stock gears were 3.27's. I went up to 3.55's just to match the 5th gear ratio in my trans. and I actually increased my gas mileage. This is in a 2000 mustang GT.
Rear gearing is important, the thing to remember when calling for a quote or help is to know when your motor starts to build torque. This will allow you to get a transmission package that you'll be happy with.
Richard
Tech Support
The motor is a built 440ci, stealth aluminum heads, K56 engle cam, headers, 3.55 Dana 60 rear, do I need the TKO 500 or TKO 600?
As I stated before, with a 3.55 rear gear, we would automatically recommend a TKO-500 based on ratios alone. Before I can give you a good educated answer, I need to know when the motor starts to build torque? 1700rpm? 2000rpm? 2500rpm? etc... This will help us decide which TKO would be better suited for your needs.
Richard
man I dont know, just bought the car saturday. Would the only way to find that be to get it DYNO'ed?
|
|
|
Re: What overdrive ratio? .64 .68 or .82?
[Re: AHall]
#144851
11/04/08 01:47 PM
11/04/08 01:47 PM
|
Joined: Feb 2006
Posts: 227
Tennessee
rj8806
enthusiast
|
enthusiast
Joined: Feb 2006
Posts: 227
Tennessee
|
Yeah, that would be the best way but honestly, if you can't do that, just go drive it and see when to starts to come on strong. Can't remember if you said it was an auto or 4 speed right now, so just put it in 4th (4 speed) or "D" for auto and cruise down the road and get a feel for when the motor starts to come on strong. Maybe some of the guru's on here can take your motor specs and cam specs and determine when the cam starts to do it's thing. Most companies that you buy cams from advertise this cam is good for 1700-5600 range or something like that. I personally have no idea about the K56 Engle cam you are using but then again, I don't know too much about Mopars. Sorry, don't hate me but I am a Ford guy thru and thru.   Richard
|
|
|
|
|
