Jerico tranmission

[Chris "drooze" Wertman]

Originally Posted by james schaechter

Roger that. The Jerico is most common, many Gforce and a few G101s. All good stuff too.

The Jerico is the lightest and can take a beating for most stockers. HEavy high HP cars sometimes opt for the Gforce.

Do some research and ask questions. It will be worth it. Any of these transmissions with a quality clutch is a ticket to fun!

I am curious as to "Why" these transmissions are used, I have thought sometime down the road about putting a clutch pedal in and going stick for lots of fun

Why would I not have my say Viper 6 speed that came with the DP built to handle the power for 2k instead of buying one of these ? (we unlike most DP owners got a NEW, not Core trans) Or should it hit Ebay or another project for a Jerico or GForce.

What are the internal differences ? What makes them "special" instead of say a M21 or Super T10 ?

I simply dont know and would like to from someone "in the know"

Good thread Jerry

[james schaechter]

Originally Posted by drooze

I am curious as to "Why" these transmissions are used, I have thought sometime down the road about putting a clutch pedal in and going stick for lots of fun

Why would I not have my say Viper 6 speed that came with the DP built to handle the power for 2k instead of buying one of these ? (we unlike most DP owners got a NEW, not Core trans) Or should it hit Ebay or another project for a Jerico or GForce.

What are the internal differences ? What makes them "special" instead of say a M21 or Super T10 ?

I simply dont know and would like to from someone "in the know"

Good thread Jerry

This could take a while if you think that stuff is even close.

M21s and ST10s are street tranies. Even if they are proshifted, they are no match for any of these dedicated race transmissions. The Jerico for example is lighter, stronger, more efficient. Not to mention a mch better selection of ratios.

Keep your eyes open at the track. Go to the web sites for Jerico and Gforce and take a look at what they offer.

You will soon realize the difference.

[Chris "drooze" Wertman]

Originally Posted by james schaechter

This could take a while if you think that stuff is even close.

M21s and ST10s are street tranies. Even if they are proshifted, they are no match for any of these dedicated race transmissions. The Jerico for example is lighter, stronger, more efficient. Not to mention a mch better selection of ratios.

Keep your eyes open at the track. Go to the web sites for Jerico and Gforce and take a look at what they offer.

You will soon realize the difference.

Ill look, I understand the reason now , if not the why....the why I can figure out.

Im just a little leary of the "because everyone does" if everyone does for a REASON and they all have the same reason cool.

If they all do because the others are doing but themselves dont know why....well....

Ive got a NOS ST10 from a 79 firebird, new never used......theres a reason for it even in my book....there are better options it just was an "off the head" example I had a close ratio muncie with straight cut gears "set up" years ago, It was a beast, and could handle everything I threw at it, but it was never "fast" it was a sherman tank....but....well that was why it went in that car.

[CycloneFE]

It has to do with the "cut" of the gear or the way it is machined. If you get a chance talk to Jerry Hemmingson sometime. I met him up at Joliet once and was in total awe.

[james schaechter]

Originally Posted by drooze

Ill look, I understand the reason now , if not the why....the why I can figure out.

Im just a little leary of the "because everyone does" if everyone does for a REASON and they all have the same reason cool.

If they all do because the others are doing but themselves dont know why....well....

Ive got a NOS ST10 from a 79 firebird, new never used......theres a reason for it even in my book....there are better options it just was an "off the head" example I had a close ratio muncie with straight cut gears "set up" years ago, It was a beast, and could handle everything I threw at it, but it was never "fast" it was a sherman tank....but....well that was why it went in that car.

Sometimes being a pioneer is a good thing. This is not one of those times......

Don't take my word for it, I don't know anything.

[Chris "drooze" Wertman]

Originally Posted by james schaechter

Sometimes being a pioneer is a good thing. This is not one of those times......

Don't take my word for it, I don't know anything.

Hey....I believe it....the saying was just "saying" I see a lot of people doing things they dont know why....If I were to run a stick, Id go with one of those 2, at this point Id be one of the crowd doing it but not really knowing the nuts an bolts, just that I should be.

Hey now I believe it 100% when I have time Id like to know the how, like as in the mechanical aspects and differences. Might learn some cool stuff I see a lot of room for improvment in car manuals for racing from bikes, maybe theyve already applied those things.

How are guys shifting these ? Cant be by hand ? Or is it ? And clutch ? Are we talking a pedal, like as in rowing a 4 gear ? I cant believe thats the way its done....is it ?

[Rich Biebel]

Muncie's broke regualrly. I know I ran one in a 12 second Stocker with 7" slicks.....ST-10's came out and they were going to be the hot ticket......WRONG.....If you ran one without touching it, the gears might sieze from being to tight. My friends MP car did it . I honed gears with a flex hone trying to loosen it up for him and that did work...........They both were used extensively but needed a lot of work and sometimes broke.....

First they were "slick shifted" then "pro shifted".....If you missed a gear they needed to come apart to be fixed.....

Doug Nash was the next trans to come along and they did hold up pretty well...

There was a guy running a '57 Corvette at my local track in Pro bracket.....The car is just like a Jr Stocker from the 60's. Stock body, small tires........Slapper bars and low 12's with various small cube small blocks, He had a Jericho in it and he told me it had more runs than he could count on it over the years and it was never out for repair.....I think he finally broke it and put an automatic in it.....

[Just Observing]

Originally Posted by drooze

How are guys shifting these ? Cant be by hand ? Or is it ? And clutch ? Are we talking a pedal, like as in rowing a 4 gear ? I cant believe thats the way its done....is it ?

This video will show you alot. Watch Jim in action and pay close attention to his nano-second clutch work on shifts. wink,wink.

[Chris "drooze" Wertman]

Originally Posted by Just Observing

This video will show you alot. Watch Jim in action and pay close attention to his nano-second clutch work on shifts. wink,wink.

Thanks VERY informative

Man his clutch leg moved so fast the video didnt even catch it

[Jeff Lee]

It's all about strength and efficiency, that's why you don't see OEM style trans in S/SS classes. Remember, at one time a quick trip to the wrecking yard and $75 - $125 bought you an OEM 4-speed with a 2.20 low gear. Those days are gone.
And let's say you have an inventory of 'em and you want to race with one. First you have to come up with a gear spread that starts with a 2.95 or so low and a 1.20-1.40 third that doesn't drop a ton of RPM on the splits. Almost impossible.
And whatever ratio's you run, you have to modify the heck out of it for strength.
The Viper trans is a long way away from taking a 500 HP engine and a solid hook on a 9" slick although the press release from today could ad some strength. But I seriously doubt it is enough...
A Jerico is around $2800 brand new with gears of your choice, ready to race. Is that too much? If so, let's talk about an auto trans for dedicated S/SS use with a convertor or two (or three or four..)

Press release:

Posted - 04/07/2010 : 8:16:22 PM
--------------------------------------------------------------------------------

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G-Force Transmissions and Long Shifters is pleased to announce some exciting new products to their already vast transmission and shifter lineup. With today's modern street cars it has become relatively easy to bolt on more than enough power to surpass the factory torque/hp ratings of virtually any OEM-style transmission. With this in mind,
G-Force has come up with a wide array of upgrade kits for most of the popular domestic OEM transmissions available today. The kits allow for factory-style installations to eliminate the need for crude and expensive modifications to the tunnels and/or crossmembers on most cars.
New Product Spring 2010


3650 Kit Available in Late Spring 2010

Already available are the T5 and T56 upgrade kits for the Mustangs, Camaros, Vipers, and a host of other vehicles that utilize one of these two transmissions. With thousands of these kits already sold, G-Force has come up with another exceptionally durable gear kit, only this one is for the 3650 transmission that comes in the 2001 to 2010 V8 Mustangs. This is the first aftermarket gear kit offered for this transmission and we've taken the unprecedented step of offering this kit with precision ground gears to help eliminate some of the NVH (Noise, Vibration, and Harshness) associated with inferior aftermarket gear kits. The gear design is from our proven T56 combination so there is already a vast database of testing experience with this particular design. A 2.90 1st gear is standard on these kits as is a .58 overdrive gear to accommodate for the typically steeper rear gear that most cars run for street/strip applications. Great for launches and even better that stock fuel mileage in most applications. This transmission can also be retrofitted into virtually any other vehicle with the addition of the special adapter that we make for "early-style" installations.

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The GF5R 5-speed transmission from G-Force is still one of the most durable and versatile transmissions available today. With both clutch-assisted and clutchless configurations available, the GF5R can be utilized in most any class or form of racing. We are now offering remanufactured GF5R's that have been traded to us at tremendous savings over new units. These transmissions have been gone through extensively and have been freshened up with all necessary parts. They typically range in price from $4,000 to $5,000 depending on model and application. Both clutch-assisted and clutchless models are available. We will do everything we can to tailor the ratios to suit your needs wherever possible. For more information, contact Jason or Bubba at

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G101For a limited time G-Force will be offering our G101A and GF4A 4-speed transmissions at special pricing. Now you can save anywhere from $100 to $400 off the regular price depending on application and model. For even greater savings, consider one of our reconditioned units that are built from high-end circle track take-out parts and in most cases are built with new cases, tailhousings, and shifters. These units are from our circle track rental program and/or trade in parts from top teams. The parts are like new, except for the price. These remanufactured transmissions typically range in price from $2,500 to $3,500 depending on model and application.

For more information, contact Bubba at 717-202-8367.
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