transmission options

[Gregwill16]

That would be good news if they came with the Ford short input shaft length. But I'm seeing it is 7.2" input shaft length, which will only work in the deeper FE truck bellhousing. The car bellhousing is only around 6.5" deep. Modern Driveline site mentions the short shaft option, but didn't think that was an option yet.

https://www.moderndriveline.com/shop/transmissions/5-speed-transmissions/tkx/ford-tkx/ford-tkx600rr-2-87-1st-gear-with-0-81-od-26-spline-input/

[Rory428]

That would be good news if they came with the Ford short input shaft length. But I'm seeing it is 7.2" input shaft length, which will only work in the deeper FE truck bellhousing. The car bellhousing is only around 6.5" deep. Modern Driveline site mentions the short shaft option, but didn't think that was an option yet.

https://www.moderndriveline.com/shop/transmissions/5-speed-transmissions/tkx/ford-tkx/ford-tkx600rr-2-87-1st-gear-with-0-81-od-26-spline-input/

That is my understanding as well, the TKX comes with a T5 length input shaft, which is much longer than a FE bellhousing. And the PU truck bellhousing is still far too shallow for the 7.2" input shaft. The truck bellhousing is only about 3/8" deeper than a FE car bellhousing.

[Tom Gahman]

       Lots of good info and precautions,thanks for sharing.

[Tunnelwedge]

That would be good news if they came with the Ford short input shaft length. But I'm seeing it is 7.2" input shaft length, which will only work in the deeper FE truck bellhousing. The car bellhousing is only around 6.5" deep. Modern Driveline site mentions the short shaft option, but didn't think that was an option yet.

https://www.moderndriveline.com/shop/transmissions/5-speed-transmissions/tkx/ford-tkx/ford-tkx600rr-2-87-1st-gear-with-0-81-od-26-spline-input/

That is my understanding as well, the TKX comes with a T5 length input shaft, which is much longer than a FE bellhousing. And the PU truck bellhousing is still far too shallow for the 7.2" input shaft. The truck bellhousing is only about 3/8" deeper than a FE car bellhousing.

These guys say "Bolts up to a standard Ford Toploader bellhousing or use a Quicktime bellhousing.".
I'm sure they can get a box to fit your spec. Just pry that wallet open a little further. lol

https://americanpowertrain.com/shop/transmissions/tremec-tkx-5-speed-tuet18086-ford-10-spline-72-5th-gear/

[Barry_R]

I installed a T56 Magnum 6 speed in my Torino a year or so ago. 
It seems to shift quite nicely at well over 7000 RPM.
The overdrive(s) are nice with the 4.86 gear in back.

It is, however, huge.
Required pretty dramatic transmission tunnel modifications.
Not a real big deal on my car since the tunnel had been butchered numerous time over the years.
I used a bunch of "bolt on" parts including a Quick Time bell housing, a McLeod dual disc clutch, and American Powertrain hydraulic throwout kit.
About the best thing I can say is that I indeed did use bolts to assemble it, after the Bridgeport had it's way with the bearing housing and making bell housing spacers, etc.

[Dr Mabuse]

No one has mentioned the Doug Nash 5 Speed, or the $4,000 Richmond Gear Super Street 5-Speed?

re:
https://www.jalopyjournal.com/forum/threads/school-me-on-doug-nash-richmond-5-speed-trannies.719988/

[Tom Gahman]

      I did wonder about that trans, thanks for the link.

[machoneman]

Jay also ran a Richmond/Doug Nash 5-speed long ago behind an FE in a Mustang.

30 years now on my Richmond 5-speed behind a near 500 HP SBF and about 20K miles. Hurst shifter works great btw. Mine is a odd one as when I ordered it, no Ford splined trannys were available and the wait time was long. Instead, I bought Chevy splined input and TH400 splined output tranny. With a fine splined clutch disc and the TH400 yoke easily added to my Ford driveshaft, I was in business. Low 1st gear (3 series) and a direct drive 1-1 5th gear, it's been a great transmission for sure. I liked (then and now) that in 5th, I get minimal HP loss unlike overdriven transmissions.

 

[jayb]

I still have mine, and it is the same as Bob's, with the Chev fine spline input.  Not sure about the output shaft.  The only thing I didn't like about it was the speedo gear setup, which I believe was for a Chevrolet gear and cable.  I tried to modify it to make Ford speedo gear work, but without success, so I just ended up plugging it and running without a speedo back in the 80s and 90s.  Never had a bit of trouble with the trans behind a nitrous injected 428CJ.  I don't know if the newer Richmond versions have internal changes, but when I looked at one on their web site and saw 450 foot pounds for the torque capacity, I was quite surprised.  I ran a 225 HP shot in my 428, and that probably got me to 600+ foot pounds of torque.  Either they are extremely conservative with their rating, or they have downsized the internals of the trans.

[Gregwill16]

Looks like they are offering a short shaft kit to work with a FE bellhousing for the TKX now, Tremec part TCKT18210.

[427Fastback]

I have been searching and found no mention of a short shaft for the TKX. Brent shortened the shaft on my TKO 600 for use on the 427 with the stock bellhousing. Not sure if the TKX can be shortened. I am looking for another 5 spd for my 67 but am particular on my 5th gear. I want a .82 overdrive (same as the 68) not a .64..American Powertrain sell two versions of the TKX and they sell the one I want.I like the gear spread on the road race transmissions.
They also make a spacer/adapter for use on a stock bellhousing. The 67 has a scatter shield but the depth is stock.Not sure how the spacer will affect the shifter location but i can deal with that.....Cory

https://americanpowertrain.com/shop/transmission-kits/1965-73-mustang-cougar-tremec-tkx-5-speed-kit/

[Gregwill16]

Cory, you must have missed the part number I supplied above. Here is a link to Modern Driveline.
https://www.moderndriveline.com/shop/solutions/engine-solutions/tkx-short-input-shaft-kit-10-spline-copy/

[Rory428]

It would be nice if they will make this shorter, Toploader length input shaft  available in a new transmission, rather than buy the trans, pay more for the short input, and then have to tear a new transmission apart to instal it.
And for the guys with other transmissions that say they have no issues shifting their TKO, or Nash/Richmond 5 speeds, just curious how they use their transmissions. If running at the dragstrip, are they lifting off the gas pedal during the shifts, or shifting at WOT, with the gas pedal flat on the floor? When I race my cars, regardless if it`s a Jerico, G Force, Toploader, or even a T5, I shift at WOT, and if any transmision I am considering won`t shift in such a manner, I have no interest in it. The current small input/out in my 4000 pound 59, gets babied of the line, simply because I am worried about breaking it on hard launches, so I slip the clutch a bit at 2000 RPM, and ease into the throttle, which must hurt the 60 foots and ETs considerably (best of 1.80 60 foot, and 12.54 @ 108 MPH so far, thru the mufflers), but once it`s rolling, I lean on it pretty hard.

[427Fastback]

Cory, you must have missed the part number I supplied above. Here is a link to Modern Driveline.
https://www.moderndriveline.com/shop/solutions/engine-solutions/tkx-short-input-shaft-kit-10-spline-copy/

I did miss that...I wonder which TKX it fits....

[427Fastback]

It looks to me like that input shaft would be perfect. It looks to be the small block length so trimming the snout for a FE would be simple if needed.It is also a 10 spline so clutch disc change may not be required. Assuming it is 1 1/16 x10. The TKX is over kill for my 67 but thats OK......Yes its a lot of money....Cory