www.neons.org

This was put together by DAve99RT, thanks Dave! Very useful info !!

http://people.clemson.edu/~dacarso/trans.htm

Backup is located here in case Dave99RT's host is ever down.

http://www.modernperformance.com/blog/neontransguide.jpg

Smaller version of what you find when you click the link in ACR MAN's signature. Credit Greg foremost. That one is easily printed and tossed in a toolbox when you go to a boneyard.

This version is a lot newer than the one that Dave copied:

http://www.neons.org/forumdodge/trans.htm

Was there any difference in the DOHC and SOHC ATX gear ratios?

I believe the only difference is in the Final Drive / Transfer gears, unless I am mistaken.

-Nick

correct me if i m wrong, but it doesn't seem to list what my 1995, SOHC Sport sedan has for a tranny. It lists base, and ACR and DOHC but not SOHC Sport.

That is because the SOHC Sport has the same transmission as all the other 1995-99 non-ACR SOHCs: the p/n 4670235 3.55 FD / .72 fifth gear unit. The '95 SOHC/MTX Sport Coupe that I briefly owned, and my sister's '95 SOHC/MTX Sport Coupe which she ordered and purchased new both had that transmission.

yes, the SOHC got a 2.86 FD and the DOHC got a 3.05 FD. somewhere between 96 and 97 they stopped using the 3.05 FD and all neons got the 2.86 FD.

~Mookie

I checked the parts manuals from '95 - '99 and the overall ratios are different for SOHC and DOHC atx's.
'95 SOHC 3.04
'95 DOHC 3.24
'96 - '99 SOHC 2.98
'96 - '99 DOHC 3.19
Production Numbers and Service Numbers in the parts manuals differ from year to year. Do we really want or need those posted for atx's?

Sure, why not? I have an ATX in the garage I'd like to know what it is by looking at the numbers and not have to take apart to count teeth.

All the info follows but not as nice a chart as ACR MAN has.

31TH ATX

year - engine - overall gear ratio - part number - production number

1995 - SOHC - 3.04 - (to 12-8-93) 4773019 - 4670800 (superceded by 4773070)
1995 - SOHC - 3.04 - (after 12-8-93) 4775070 - 4659405
1995 - DOHC - 3.24 - 4762108 - 4670169

1996 - SOHC - 2.98 - 4778715 - 4659962 (superceded by R4778715AA)
1996 - DOHC - 3.19 - 4778716 - 4659960 (superceded by R4778716AB)

1997 - SOHC - 2.98 - 4883103 - 4659962 (superceded by R4778715AA)
1997 - DOHC - 3.19 - 4883102 - 4659960 (superceded by R4778716AB)

1998 - SOHC - 2.98 - 4883103AB - 4659962 (superceded by 4883103AC)
1998 - DOHC - 3.19 - 4883102AB - 4659960 (superceded by 4883102AC)

1999 - SOHC - 2.98 - 4883104AC - 4659962
1999 - DOHC - 3.19 - 4883102AC - 4659960

31TH ATX was also on the 2000 and 2001 Neons but there was only the SOHC available. The parts manual has two numbers for each year and shows gears for 2.98 and 3.19 ratios, but I'm not sure which number has which ratio.
year - part number - production number

2000 - 5014299AA - 4799901AB (superceded by 5014299AB)
2000 - 5014300AA - 4800309AA (superceded by 5014300AB)

2001 - 5014299AD - 4799901AD (superceded by 5014299AC)
2001 - 5014300AC - 4800309AC (superceded by 5014300AB)

ive been thinking about this, but not sure if it will work. would the 5th gear in a 95 SOHC fit into my 99 r/t? its a higher gear, so my car wouldnt rap out at 125 and it would get better gas mileage. pm me

Changing any individual gears is not easily done. Might as well just swap the entire tranny. Most PCMs have a built in speed limiter and rev limit. See the faq:
http://faq.neons.org/faq/
See this thread:
http://forums.neons.org/viewtopic.php?t=302876

What is the row "Reverse Brake" on this chart?

The reverse brake (if equipped) adds a synchronizer blocker ring to the "reverse" side of the 5-R synchro assembly. This ring will stop the input shaft when reverse is selected, avoiding the "crunch" sound when reverse is selected quickly after depressing the clutch pedal. Reverse is not synchronized, though -- all versions of the T350 use a straight-cut reverse idler gear which is flipped into mesh by a small shift fork.

OK another stupid question.

I always thought the SOHC had longer gears and thus was better for a turbo application. But from what I see in that chart all of the gears are actually the same, with exception of 5th gear.

So assuming I'm going to be doing all my driving in gears 1-4, will I really care about a longer 5th gear while driving around the city? - Or is there something I'm not getting here?

Thanks for the knowledge :-)

yes, you're not looking at the differential ratio. the turbo cars like the 3.55, the all motor cars like the 3.94.

~Mike

i have a question couldnt find an answer anywhere. i have a 97 base automatic (no tach) if i floor it around what speed should it be shifting into 2nd at? im asking this because im curious about my spedo if its accurate or not it used to be around 50mph then my spedo failed and did the whole heating the joints fix and now its around 40mph.. thanks

As long as it's shifting at the same rpm, it should still be ~50mph or so.

what numbers on this chart would be found on the transmission tag?

is the cloud car trans usable in a neon? I just noticed it has the same gear ratios as the ACR/RT unit but a different part#. is it just a matter of mounting bosses or something or do internal parts change?

Yes. 5sp cloud cars have a cable bell housing, and bolt right up.

I just found out that my 98 sohc sport coupe has a 3.94 transmission with .72 5th gear. I assumed someone must have swapped it.

Another way to say it:
A synchronizer matches speed between the gears as you shift, this prevents the gears from grinding as they engage, because they are spinning at the same speed by the time they engage.

Reverse does NOT have a synchronizer. BUT some later trans have a "brake" on the reverse gear.

That is because, you're suppose to shift into reverse when you are a stop, but the idle shafts and gears can still be spinning in the trans while you're at a stop, the brake stops the idle gears from spinning and thus the reverse gears are all at the same speed, which is 0, i.e. stopped, when you shift into reverse.

NO, that is NOT a synchro in any form, try shifting into reverse while moving, even 1/2 a mph, the gears will grind.

The tranny doesn't have a brake for reverse, unless you've been sitting for a while, the trans will grind when you shift into reverse, even if you are stopped.

If it "slows" down the shaft to match speeds, does it not synchronize shaft speeds, hence synchro name :)

Click on >> http://www.thefreedictionary.com/synchronize

What is a cloud Car?

Dodge Stratus and Dodge Cirrus

They are named after types of clouds, hence the nick-name "cloud cars."

The 5sp version only comes with a sohc engine though, and (as you stated) have the same gearing as an acr or r/t neon.

Seems the 3.94 .81 mtx was pretty popular. It was used for all 5sp 420A cars and cloud cars.

Purpose, i think you meant Dodge Stratus, Plymouth Breeze, and Chrysler Cirrus.

That's what I said #%^&*