904 Low Gear Set

I have two, 4 planetary gears (front and back) for a 904 type trans. No transmission.
how can I tell if they are the low gear set?

If no one answers, Google it & pics/info will come up

The 2.74 low gear set's sun gear is the key. Look at the front half of the sun gear, if it is bigger than the back half, it is a 2.74 low gear. If the front and back of the sun gear is the same diameter, then it is a 2.45 low gear set.

here is a link for good info -

http://www.forabodiesonly.com/mopar/thre...th-pics.307306/


Post #11 shows a close up of the sun gear

John

Hey thanks! that was a lot of help. Mine are not the low gears. Dang.

They made a million transmissions with the low gearset, should not be too expensive for someone to mail you a set wherever Over There is.

R.

The 6 cylinder trannys have the lo gear set and ork in the 727.
I ran them in a small block barracuda.
made a noticeable difference.

A local transmission shop charged me $50 for a used sun gear and planetary for my 904 years back. It wasn't worth the effort in a street car.

A factory low gear in a 727?!

Nope

There was someone that took the 904 low gear set and managed to make it fit the 727 with a lot of machining and splicing of 904/727 parts and welding.

But stock?

Nope

There are aftermarket low gear sets for the 727, but not cheap.

For some of the young'uns in the crowd...Mopar engineers were fighting a losing battle as the death-spiraling company had outdated cars and there wasn't much money to develop new parts like an overdrive auto transmission, at least not an inexpensive one. But they still had to meet CAFE regulations or pay a fine per car sold.

So they "faked" an overdrive by installing 2.45 or 2.29 gears in the rear. The car was ALWAYS in a sort of overdrive. To get the car to start rolling with a 130 hp 318 or a 95 hp 225, they put deeper First gears in the transmission. This could be done on the cheap.

If they help or not on the dragstrip depends mostly on the car and to some extent on the driver.

R.

Both of you are incorrect as I drove the car with the modified low gear set up behind my 340 in my car at the track for 3 years.