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Old 04-15-2022, 03:54 PM
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Default TKX conversion

Ok, so I realized that I'm going to do this eventually, and with the new motor going in this seems like the best time to do it.

There are several vendors. Who is best, who to avoid, are they all about the same? What are the bare minimum parts required?

Thanks.

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Old 04-15-2022, 04:49 PM
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As far as suppliers, I got mine from Holley. But there is shortages all over so you should check carefully.

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Old 04-15-2022, 05:23 PM
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I would say everyone's about the same...I got mine from APT. A complete kit is probably the easiest, but see whose kit you like the best. There are a lot of crossmembers I would not use.

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Old 04-15-2022, 05:34 PM
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If you already have a stick shift car I would not buy a kit.Tom

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Old 04-15-2022, 06:04 PM
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From a previous thread, it seems like the only things I need are the Transmission, Shifter, clutch disc, speedo cable and driveshaft. Is that right? What about the mount? Also it seemed like maybe the stock crossmember can be used but may need mods?

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Old 04-15-2022, 06:32 PM
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I actually bought a Xmember as im lazy.Your speedo cable will attach to the adapter in the trans as I remember.You will need a trans yoke and just have your shaft shorten and yoke put on.If you have a 10 spline disk you will need a 26.If me,I believe you replace a pilot and throwout bearing whenever you SEE them.Tom

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Old 04-15-2022, 07:21 PM
64gp4spd 64gp4spd is offline
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I just purchased the Transmission and Kit from APT.
It is going in a 1964 GP. The Kit is for the 64-67 A Body
I had a Super T10 in the car with 65 and up bellhousing,
Z-Bar, later crossmember and mount. Curious to see
how much will need to be modified other than shortening
the driveshaft.

  #8  
Old 04-16-2022, 01:58 AM
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Quote:
Originally Posted by jhein View Post
From a previous thread, it seems like the only things I need are the Transmission, Shifter, clutch disc, speedo cable and driveshaft. Is that right? What about the mount? Also it seemed like maybe the stock crossmember can be used but may need mods?
You may want to upgrade the bellhousing as well but it’s probably not absolutely necessary. Just a guess but I imagine you’ll be on street tires 99% of the time so I doubt you’d hurt anything.

The magnum 6 speed is also an option but is more expensive. I have TKX and Magnum quotes from 3 vendors for complete kits ranging from $5400-$8000. If you reuse your original pedals and use manual linkage (not using hydraulic set-ups they push) it can be done for about $5000 all in.

Once I finish a few other updates a TKX or Magnum is next on my list for my TA.

Edit: I will say I don’t like the crossmember from American Powertrain. I don’t see how a bolt together unit could be anywhere near as strong as a welded piece. But that’s just me

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  #9  
Old 04-16-2022, 09:22 AM
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I just put a TKX in my 72 Lemans. I bought most of the stuff from APT.

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  #10  
Old 04-16-2022, 09:40 AM
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I started taking a closer look at the gearing for the TKX and I don't think it will help me very much with my current 3.31 gear. Seems like the goal should be lower gearing in 1-3 then a good OD ratio. The close ratio gives me a little better 1st, same in 2nd, worse in 3rd and the OD puts me at 2.25 or 2.68. The wide ratio is better in 1st and 2nd, worse in 3rd with OD at 2.38. They recommend a 3.73 rear gear and I can see why. I'm not really interested in changing my rear gear (again...). Seems like the M22Z would be a better choice if I keep the 3.31 gear. I know it's not as strong as the TKX and I give up the OD, but I'm a backroad cruiser with a 3.31 so I don't think I'll miss the OD, and I'd have a nice improvement in 1st and 2nd gear.

TKX:

Wide Ratio – 3.27, 1.98, 1.34, 1.00, 0.72
Close Ratio – 2.87, 1.89, 1.28, 1.00, 0.68 OR 0.81

M22Z:

2.98, 2 .04, 1.46, 1

M20:

2.52, 1.88, 1.46, 1

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Old 04-16-2022, 10:41 AM
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I had a M22 with 3.36 gears. I drive my car on the highway. With the M22 it would turn 3000 rpm at 60 mph. The TKX at 70 mph on turns 1900 rpm.

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Old 04-16-2022, 12:42 PM
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Quote:
Originally Posted by gman005 View Post
The TKX at 70 mph on turns 1900 rpm.
Man, that must be pretty dreamy.

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  #13  
Old 04-16-2022, 01:31 PM
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American Powertrain or Silver Sport are the top 2 vendors. American Powertrain I bought from due to lower shipping costs and no tax.

  #14  
Old 04-16-2022, 03:06 PM
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Quote:
Originally Posted by 65madgoat View Post
American Powertrain or Silver Sport are the top 2 vendors. American Powertrain I bought from due to lower shipping costs and no tax.
APT uses a proprietary "Bolt on" shifter. If you have problems with the shifter you can replace it with another brand if theirs is no longer available.

Silver Sport "Machines" the TKX tail housing and then uses their proprietary shifter. Leaving no options in case of shifter failure except buying their shifter as long as they are in business.

Both companies are great to deal with. I have had a trans from both and I have visited both in person.

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Old 04-16-2022, 04:38 PM
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Quote:
Originally Posted by gman005 View Post
I had a M22 with 3.36 gears. I drive my car on the highway. With the M22 it would turn 3000 rpm at 60 mph. The TKX at 70 mph on turns 1900 rpm.
Wow! 3000 rpm at 60 mph is what my car did when it had 4.33 gears. What size tire is that with? And your at 1900 @70mph in the same car and same tire?

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Old 04-16-2022, 06:58 PM
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Quote:
Originally Posted by jhein View Post
Wow! 3000 rpm at 60 mph is what my car did when it had 4.33 gears. What size tire is that with? And your at 1900 @70mph in the same car and same tire?
I agree.....something's not right unless he's running super short tires. All the GTO's I've had and have driven with a 3.36 gear and stock height tires ran 70 mph at about 3000 rpm. 3,000 at 60 is more like a 3.55-3.90 number.

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Old 04-16-2022, 08:36 PM
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Quote:
Originally Posted by jhein View Post
I started taking a closer look at the gearing for the TKX and I don't think it will help me very much with my current 3.31 gear. Seems like the goal should be lower gearing in 1-3 then a good OD ratio. The close ratio gives me a little better 1st, same in 2nd, worse in 3rd and the OD puts me at 2.25 or 2.68. The wide ratio is better in 1st and 2nd, worse in 3rd with OD at 2.38. They recommend a 3.73 rear gear and I can see why. I'm not really interested in changing my rear gear (again...). Seems like the M22Z would be a better choice if I keep the 3.31 gear. I know it's not as strong as the TKX and I give up the OD, but I'm a backroad cruiser with a 3.31 so I don't think I'll miss the OD, and I'd have a nice improvement in 1st and 2nd gear.

TKX:

Wide Ratio – 3.27, 1.98, 1.34, 1.00, 0.72
Close Ratio – 2.87, 1.89, 1.28, 1.00, 0.68 OR 0.81

M22Z:

2.98, 2 .04, 1.46, 1

M20:

2.52, 1.88, 1.46, 1
Ask Caster1 about the M23Z with real power in front of it, even on street tires

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Old 04-16-2022, 08:41 PM
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I have the TKO600, with 3.70 gears and a 26 inch tall tire my RPM at 75 is supposed to be 2296.

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Old 04-16-2022, 08:50 PM
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Quote:
Originally Posted by 64speed View Post
Ask Caster1 about the M23Z with real power in front of it, even on street tires
I searched and found a thread where Caster1 blew up a M20 and was considering the M23Z. Is there more to the story??? The suspense is killing me!

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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear

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Old 04-16-2022, 09:17 PM
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Quote:
Originally Posted by jhein View Post
I searched and found a thread where Caster1 blew up a M20 and was considering the M23Z. Is there more to the story??? The suspense is killing me!
Blew up an M23Z. Just street tires. Jody’s transmission made it right and sent higher strength gears for a rebuild, it’s holding up so far.

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