Which TKO 600 to get .64 or .82?

[Dangerous Doug]

331 Stroker with an aggressive cam, 3.54 years, TKO-600/0.82 in my ERA 289 FIA. Freeway cruising speed is comfortable in fifth.

I think the 0.64 would lug.

DD

[1795]

A lot depends on the rear end ratio and cam specs, as others have stated. I have driven in cars with the .64 and .82 with different gear ratios. The cars that had the .64 ratio tended to do better with a 3.73 rear end and the .82's ran well with a 3.47 ratio. These were moderate builds. Any more aggressive cam will want to run at minimally 2,000 rpms. Food for thought.

[BADSN8K]

Hello

I recently had to make this decison as well.

You have heard a lot of good info

Here is what I found

Coyote Motor with Lund tune
Rrunning 315 30 18 tires in rear
391 rear end
Tremec 600 with final drive .68 (NOT .64)

I chose this as I plan to drive the car and make some nice long cruises. At 80mph I am running about 2750 rpms.... with nice fuel economy.


The final gear I found was actually a .68 in my Tremec 600

See this part # https://fordperformanceracingparts.c...tKeyField=7618

Here is a calculator!

Engine RPM Calculator

Good Luck!

[BADSN8K]

BTW

I paid $2195 from Jegs NO tax and NO shipping charges...

The 6 speed weighs more and you will never use 6th gear.

Again, good luck!!!

[dallas_]

Like the others have said, run the gear calculator to decide what works best for you.

I have the .64 5th and love it for highway cruising. About 2,100 rpm @ 75 mph. If you are in that range your motor should have plenty of power to pull in case you need to pass.

[Cashburn]

Originally Posted by BADSN8K

Hello

I recently had to make this decison as well.

You have heard a lot of good info

Here is what I found

Coyote Motor with Lund tune
Rrunning 315 30 18 tires in rear
391 rear end
Tremec 600 with final drive .68 (NOT .64)

I chose this as I plan to drive the car and make some nice long cruises. At 80mph I am running about 2750 rpms.... with nice fuel economy.


The final gear I found was actually a .68 in my Tremec 600

See this part # https://fordperformanceracingparts.c...tKeyField=7618

Here is a calculator!

Engine RPM Calculator

Good Luck!

That's a typo on the Ford Racing site. The 600 only comes in .64 or .82 ratio from Tremec:

Application Part # Engine Torque Capacity
(lb-ft.) Includes
Housing Clutch Type Speedo Type Spline Count
Input / Output Gear Ratios
1st 2nd 3rd 4th 5th 6th Rev
GM TCET4616 Any 500 No Hyd Mech/Elec 26 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00
GM TCET4618 Any 600 No Hyd Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .82 N/A 2.56
GM TCET5009 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .64 N/A 2.56
Ford TCET4615 Any 500 No Mech Mech/Elec 10 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00
Ford TCET4617 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .82 N/A 2.56
Ford TCET5008 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .64 N/A 2.56
Ford TCET5201 Any 500 No Hyd Mech/Elec 26 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00

The 500 (which you do not have) has the .68 OD.

[BADSN8K]

Originally Posted by Cashburn

That's a typo on the Ford Racing site. The 600 only comes in .64 or .82 ratio from Tremec:

Application Part # Engine Torque Capacity
(lb-ft.) Includes
Housing Clutch Type Speedo Type Spline Count
Input / Output Gear Ratios
1st 2nd 3rd 4th 5th 6th Rev
GM TCET4616 Any 500 No Hyd Mech/Elec 26 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00
GM TCET4618 Any 600 No Hyd Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .82 N/A 2.56
GM TCET5009 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .64 N/A 2.56
Ford TCET4615 Any 500 No Mech Mech/Elec 10 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00
Ford TCET4617 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .82 N/A 2.56
Ford TCET5008 Any 600 No Mech Mech/Elec 26 / 31 2.87 1.89 1.28 1.00 .64 N/A 2.56
Ford TCET5201 Any 500 No Hyd Mech/Elec 26 / 31 3.27 1.98 1.34 1.00 .68 N/A 3.00

The 500 (which you do not have) has the .68 OD.

Dang... wrong again??? I went with what was on the web site.... Is it possible the M-7003-R58H is a .68????

Not just FORD got it wrong.... But so did about 10-20 other retailers. CJ PONY PARTS, JEGS, SUMMIT, FORD, AMERICAN MUSCLE, BROTHERS PERFORMANCE to name a few.....

Bad info from TREMEC marketing????

https://www.google.com/webhp?sourcei...#q=m-7003-r58h

Either way. Great set up for me!

Thanks

[tkb289]

Originally Posted by Dangerous Doug

331 Stroker with an aggressive cam, 3.54 years, TKO-600/0.82 in my ERA 289 FIA. Freeway cruising speed is comfortable in fifth.

I think the 0.64 would lug.

DD

I agree … have the same setup in my ERA FIA, except with a 302. The TKO600 with the 0.82 is an excellent setup, highly recommend it.


From that I understand from the Tremec website, the TKO600 has the 0.64 or 0.82 5th gear, but there are other part number Tremec transmissions that offer other 5th gear ratios.


Application Ford
Part # TCET5008
Torque Capacity (lb-ft.) 600
5th .64

Application Ford
Part # TCET4617
Torque Capacity (lb-ft.) 600
5th .82


Tremec website - see tab - Technical Specifications
TKO 5-Speed Transmission

[blykins]

It will all depend on the camshaft and where you will do your most driving.

The .82 is sold the most because it fits a lot of Cobra combinations the best. Most Cobras have more "peppy" engines with larger camshafts that don't like to be held down to lower rpms. As the guys have stated up above, engines will "lug" or "buck" if they are forced to pull at low rpms. Also, most guys drive the most at the 55-60 mph speed and stay off of the interstates.

In my mind, even without knowing the rest of your combination, the .82 overdrive will probably fit your situation the best.

I wish we could sell them for $2195 again....that was several years ago. Now the MAP is $2399. No haggling, Tremec holds us to their pricing.

[Cashburn]

Originally Posted by blykins

It will all depend on the camshaft and where you will do your most driving.

The .82 is sold the most because it fits a lot of Cobra combinations the best. Most Cobras have more "peppy" engines with larger camshafts that don't like to be held down to lower rpms. As the guys have stated up above, engines will "lug" or "buck" if they are forced to pull at low rpms. Also, most guys drive the most at the 55-60 mph speed and stay off of the interstates.

In my mind, even without knowing the rest of your combination, the .82 overdrive will probably fit your situation the best.

I wish we could sell them for $2195 again....that was several years ago. Now the MAP is $2399. No haggling, Tremec holds us to their pricing.

I think he purchased it from Jegs in March of 2015.

[Dwight]

over 30,000 miles on a 600 with .64

Dwight

[BADSN8K]

Originally Posted by Cashburn

I think he purchased it from Jegs in March of 2015.

I stand corrected.... paid 2095 July 10th order date