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Username Post: Tremec Tkx 5 speed        (Topic#366417)
S10mk 
Newbie
Posts: 36

Reg: 01-03-19
09-16-21 04:03 AM - Post#2827176    

Hi everyone,
I'm really thinking hard about buying the new tremec tkx 5 speed for my 67 Biscayne. I currently have a super t10 4 speed. I'm having a hard time deciding which model to go with. One close ratio with a .68 overdrive and another close ratio with a .81 overdrive. The car has a blue print engines 350 crate engine that makes a little over 400ft/lbs with a nice broad power curve and a 3.55 rear end.
If I go with the .81 overdrive, my engine rpm will be 2k at 55mph and 2500 at 70mph
If I go with the .68 overdrive, my engine rpm will be 2k at 66mph and 2100 at 70mph. With 70mph as my target highway speed.

What are your opinions? Has anyone bought the new TKX?
Thank you!



 


aghaga 
"4th Year" Silver Supporting Member
Posts: 2331
aghaga
Age: 67
Loc: Altavista, Va.
Reg: 07-05-08
09-17-21 07:13 AM - Post#2827256    
    In response to S10mk

I'm running a Keisler Perfect-Fit 5-speed in my 66 Impala w/383 engine and 3.55 gears. (3.27 first and .72 OD) SilverSports Transmissions in Tenn. They bought out Keisler a few years ago and carry TKO-500 and 600 Perfect-Fit transmissions for our B-Body's. With a 28" tall tire (275/60/15) I'm turning about 2000 rpm. Pretty good combination for a heavy car.



 
japete92 
"7th Year" Silver Supporting Member
Posts: 1783
japete92
Loc: No. Virginia
Reg: 01-18-13
09-17-21 11:47 AM - Post#2827263    
    In response to S10mk

I only have read about the TKX; no experience with one. Seems like a very nice transmission.

But, I doubt I would nix a perfectly good (already installed) super t10 four speed to save a few hundred rpm at 65/70 mph.

Once the decision is made to change, either of those overdrive ratios would be fine. I'd likely choose the one that improved hwy mpg the most because I can ALWAYS simply downshift to accelerate.

Just a few thoughts.

Pete



 
S10mk 
Newbie
Posts: 36

Reg: 01-03-19
09-18-21 04:19 AM - Post#2827299    
    In response to aghaga

  • aghaga Said:
I'm running a Keisler Perfect-Fit 5-speed in my 66 Impala w/383 engine and 3.55 gears. (3.27 first and .72 OD) SilverSports Transmissions in Tenn. They bought out Keisler a few years ago and carry TKO-500 and 600 Perfect-Fit transmissions for our B-Body's. With a 28" tall tire (275/60/15) I'm turning about 2000 rpm. Pretty good combination for a heavy car.


How do you like the 3.27 first gear? There is a different TKX model with a 3.27 first gear which I was considering. But I was worried that might be geared too deep for first gear. What are your experiences?



 
aghaga 
"4th Year" Silver Supporting Member
Posts: 2331
aghaga
Age: 67
Loc: Altavista, Va.
Reg: 07-05-08
09-18-21 04:50 AM - Post#2827301    
    In response to S10mk

In first gear it is like having a wide ratio Muncie with a 4.56:1 rear. The RPM drop between gears seems consistent with a good spread. With the 28" tall tire and 3.55:1 it is fine but I don't think I would want it with a 3.73:1.



 


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