[straycat]

I sold the old reliable 62 Catalina race car for something new. I love 65s so I got a Tempest from a friend. 400 with a knock, ST-10, 12 bolt 3.42s. Replacing the 400 with a spare mild Hansen Racing 500hp 455. I want to replace the ST-10 with something that will live on both the track and street. I probably run 20 times a year mostly club races, nostalgia and Norwalk. The trans will get a fair amount of abuse so I don't think the current trans or spare M20 will live behind this motor. I was thinking about a trans from Auto Gear or Midwest Muncie. Others? Who do you guys recommend. Clutches, flywheel?

[1966socalgoat]

I bought an M23Z direct from Autogear better warranty and helped me pick the gear ratios. I also picked up a long shifter direct as well form them and i love it, very nice, positive shifting.

[Dragncar]

I installed a Ford Top Loader in my 69 GTO 36 years ago. Ran it for 10 years or so. Never had a problem.
Cut the shift handle to come up in the factory console. Muncies weigh what, 65 lbs. Top loader weigh 120lbs. Not hard to figure out which is tougher. I ran a short tail out of a 65 Mustang. Had a mid length out of a Fairlane too. Still have the stuff.

[ponjohn]

Jerico if you have the budget.

[mgarblik]

A Ford Top Loader is allot of bang for the buck. I have had no problem shelling the cluster gear and destroying other components in a Muncie at 400 HP. Super T10 is a little stronger but still not up to the power you are talking about long term. Another, often overlooked strong transmission now days is a Doug Nash 5-speed. I know you said 4-speed, but a Nash is 1:1 in 5th so you can get a great ratio spread. They made allot of them, super easy to service, and not too expensive used. It falls right in the HP range you are talking about and would be reliable if you found a good one. The G force trans is based loosely on the Nash design but much, much more expensive.

[455firebird1969]

Is the G force trans the type you let the clutch out for launch only? Then it is shifted without the clutch pedal, like a Jerico.?

[455-4+1]

Following

I have a 76 TA which is going back to street duty, installing original 455 (with a few hundred HP more than stock !!) and the original ST10 (2nd design with 1" layshaft)

I am concerned about the durability as I have broken one in the past.

As a street / strip car I ran a Dough Nash straight cut box with dog gears in it , after years and hundreds of passes flat shifting at 1850kg with over 600 ft/lb it looked like new, but was a pig on the street. Would pull the front wheels in 1st and 2nd gear so it was pretty well hooked up and the trans survived. I believe the clutch had allot to do with this (Hays 12 post slider with solid hub sintered iron disk and adjustable static / lever angle and centrifugal assist

Only issue is I want the stock Hurst shifter in the stock console .
Have looked for a billet steel mid plate for the ST10 but to no avail, possibly even an iron case. They are re-making for muncie, but not ST10 from what I can see.

I think an iron case ST10 with billet steel mid plate could survive some punishment and have the stock shifter in the stock location ??

[mgarblik]

Originally Posted by 455firebird1969

Is the G force trans the type you let the clutch out for launch only? Then it is shifted without the clutch pedal, like a Jerico.?

They have a wide variety of products, Nash based, and T5 based, and looks like BW based too. My original post was talking up the strength and simplicity of the Nash based units. Available, clutchless and clutch shifted. Not for the fainthearted. $$$$$ That's why I have opted for used Doug Nash ones.

https://www.gforcetransmissions.com

[ponjohn]

Originally Posted by 455firebird1969

Is the G force trans the type you let the clutch out for launch only? Then it is shifted without the clutch pedal, like a Jerico.?

Stock eliminator cannot use clutchless transmissions, but they are all shifted with no clutch. Most use Jerico.


Maybe a liberty prepped trans.

[mgarblik]

Good friend of mine has a 64 Hemi SSB full size Plymouth. Uses a G Force launching with clutch and then pulling gears. Trans does pretty well, but this is a heavy car that leaves on the rear bumper and makes allot of HP.

[brut4s]

Also wondering about autogear. How strong is it?

[1966socalgoat]

I dont think they publish hp and torque ratings but in talking with them they say that the M23 will live behind 800-900hp

[younggto]

I have a G Force G101A/Long shifter in my street/strip 67 GTO. Kinda brutal on the street due to dog rings and no synchronizers. I have a clutch assisted unit (I don’t believe they offer the clutchless one anymore) but at the track you can just pull gears if you want; just keep the throttle pinned. Gear whine is evident in 1-3 due to the straight cut gears. Floorpan modification would be required in most any application I’d say due to the straight shifter rods and overall size of the shifter itself. G Force Transmission and Long Shifters are the same company FWIW.

It’s certainly a compromise; but a good street car doesn’t make a good race car, and vice versa.

Clutch type is also dependent on intended usage and there’s no one trick pony either...


Sent from my iPhone using Tapatalk

[bpenrod]

Get the strongest you can afford, and just have to do it once. I raced M/P back in 80-81, had to go through the crash box every two races if I went rounds. Seemed like fun then. Lol.

[brut4s]

Thank you 1966socalgoat

[younggto]

If you plan on a bunch of street driving I would look into the M23. I had an AutoGear M22W before, great transmission but I had the roller first gear which isn’t for drag racing. I certainly abused the heck out of it for many years and it didn’t break but was showing signs that it was getting worn. When I bought it I didn’t intend on racing it and figured I’d save it for a future project. Hope this helps some


Sent from my iPhone using Tapatalk

[straycat]

Talked to Nathan and George at Auto Gear today. They have been in this business forever and know their stuff. And if there's a problem they want to correct it and improve the product. Your not dealing with some conglomerate. I'm going with an M23 and ratios they suggested. They also have several recommended dealers. Note: Nathan is a Pontiac guy.

[Chief of the 60's]

Find yourself a Doug Nash.

[JSPONT]

I have a heavy car that makes good power. I am now automatic . With that said,
I broke 2 t 10's, I broke a tko 600 2 times. I then put a Ford toploader in. It was from a 69 SCJ torino. I had liberty gear make me the input shaft for a fine spline gm. $340.00.
It lasted the best. Street driving and street racing 1.5 seasons before I broke it. I went to the track, got some tire shake, went to hit 3rd and snapped the main shaft.
I bought a new shaft fixed it but sold it to re coupe $$$ from switching to automatic. I miss the stick shift.
The Jerico boxes are based on the toploader. The steel case is where I think the strength comes from. Chrylser 833 and crash box are also very strong steel case trannys.

[Skip Fix]

https://www.hotrod.com/articles/judg...ource=facebook

Richard is still banging the gears in this car and doing well and a lot of power being put to it.