Fortin 5 Speed H Pattern

wrightjarred14

wrightjarred14

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Hey everyone, looking at a sand car with a Fortin 5 Speed transmission. Can’t seem to find much info on them. Was wondering if anyone has any info. Thanks!
 
H pattern and not sequential?

I ran the 4 speed H pattern for years.
With a stock LS1, I was going 5 years between needing to replace 2nd gear, I just wore it out.
Once I added a supercharger, then I started having issues.
Pinion head bearing, multiple times, wore out 2nd gear again.
Seems like when you start adding power to the 4 and 5 speed H pattern boxes, they don't seem to last long.
Parts are super expensive.
R&P is $8k just for that.

They shift awesome with no clutch.
I got tired of it and went to a S4.
 
Last edited:
lincster said:
H pattern and not sequential?

I ran the 4 speed H pattern for years.
With a stock LS1, I was going 5 years between needing to replace 2nd gear, I just wore it out.
Once I added a supercharger, then I started having issues.
Pinion head bearing, multiple times, wore out 2nd gear again.
Seems like when you start adding power to the 4 and 5 speed H pattern boxes, they don't seem to last long.
Parts are super expensive.
R&P is $8k just for that.

They shift awesome with not clutch.
I got tired of it and sent to a S4.
Click to expand...
Sorry I should’ve included that but H pattern.
 
Fortin is a great transaxle. We ran a 4 speed H pattern when I raced Class 1 Unlimited but it had a torque convertor so it was easy on CV's. The straight cut gears tend to be noisier then a Mendeola or Albins. It's an American made product in El Cajon, CA and parts are readily available.
 
L.R.S. said:
Fortin is a great transaxle. We ran a 4 speed H pattern when I raced Class 1 Unlimited but it had a torque convertor so it was easy on CV's. The straight cut gears tend to be noisier then a Mendeola or Albins. It's an American made product in El Cajon, CA and parts are readily available.
Click to expand...
McMullen says the same thing, when you run a torque converter, they last so much longer. Easier on everything.
 
L.R.S. said:
Fortin is a great transaxle. We ran a 4 speed H pattern when I raced Class 1 Unlimited but it had a torque convertor so it was easy on CV's. The straight cut gears tend to be noisier then a Mendeola or Albins. It's an American made product in El Cajon, CA and parts are readily available.
Click to expand...
Not to derail this but is the converter between the motor and trans. Iv never seen one on a pleasure car and don’t really make to any of the race series.
 
lincster said:
McMullen says the same thing, when you run a torque converter, they last so much longer. Easier on everything.
Click to expand...
Kevin runs a convertor in his personal prerunner too.

Drupanddown said:
Not to derail this but is the converter between the motor and trans. Iv never seen one on a pleasure car and don’t really make to any of the race series.
Click to expand...
As @lincster said it takes the place of the clutch. The transaxle still uses diff fluid but the torque convertor had trans fluid. They run very hot and need to have adequate cooling. We ran three coolers and a heat exchanger. We wanted the trans fluid to run at 200*F so I'd cycle the fans ON/OFF at the beginning of the race.
 
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