Passon 4 speed with overdrive gear

Darter6

FBBO Gold Member
FBBO Gold Member
Local time
2:42 PM
Joined
Dec 29, 2009
Messages
6,042
Reaction score
7,060
Location
Nevada
If you mean his 833 with 4th as overdrive then yes it works well.
Back in 2007 we built this 'Cuda with one behind a 451 B engine and 3.73 gears.
Did a long haul Hot Rod Power with the car and put 5,000 miles on it.
Car got 20 mpg cruzing at 65 mph.No power steering or brakes,no A/C. Car is still running around to this day.
100_1169.JPG
 

jt4406

Well-Known Member
Local time
3:42 PM
Joined
Jul 17, 2008
Messages
60
Reaction score
81
Location
Jackson, Ky
I've had one in my challenger for 5 or 6 years now, getting close to 14000 miles on it. I love the gear spacing (rpm drop between gears) and the cruise rpm with my 3.54 dana axle. OD drops rear gear to about 2.8. Only complaint I have at all is it seems noisy in OD. Granted my car is very quiet inside with complete stock (Accurate LTD 2.5 inch) exhaust. It is probably as quiet as could be expected. Just my experience and 2 cents. (note: I only bought the gear set from Passon, built the transmission myself)

7-2.jpg
 

Chi Town Runner

Well-Known Member
Local time
1:42 PM
Joined
Jul 31, 2008
Messages
127
Reaction score
122
Location
Tennessee
Thought they had a modified 833 with a 5th gear OD.....?
When you talk about an A-833 with a 4th gear OD that's different than Passons
The 4th gear OD trans (what I have in my RR) the ratios are:
1st - 3.09
2nd - 1.67
3rd - 1.00
4th - 0.73
This was a trans used (I believe) in Chrysler motor homes.
It's great for Highway. My 3.23 rear gear gives my 2100RPM at 70 MPH
Down side= The extreme low 1st gear (granny gear), and the drop in RPM going to 2nd
Complete bolt in, except for my '68 I had to change (simple bolt in) transmission mount

The standard A-833 4-speed trans was
1st - 2.66
2nd -1.91
3rd - 1.39
4th - 1.00
There was some difference (minute) between a 18 vs 23 spline "Hemi box" but you get the idea.

Passons 5 speed trans is
1st - 2.64
2nd - 1.92
3rd - 1.40
4th - 1.00
5th - 0.70
Passons is a complete bolt in.
No modifications to drive shaft, bell housing, clutch or floor.

The TKX 5-speed trans is
1st - 2.87
2nd - 1.89
3rd - 1.28
4th - 1.00
5th - 0.68

You have to cut the floor (on my '68) different drive shaft, bell housing etc.

I have no personal experience with Passons or the THX5
Frank
 

Darter6

FBBO Gold Member
FBBO Gold Member
Local time
2:42 PM
Joined
Dec 29, 2009
Messages
6,042
Reaction score
7,060
Location
Nevada
Jamie Passon was making his own overdrive 4 speed using the A-833 that was a complete bolt in.It was capable of high horsepower before he came out with the Passon 5 speed.
Mopar had their version that was light duty mostly found behind Slant Six cars of the late 70's.
 

biomedtechguy

Accelerati Rapidus Maximus
FBBO Gold Member
Local time
2:42 PM
Joined
Mar 28, 2014
Messages
28,738
Reaction score
42,324
Location
South Louisiana
Thought they had a modified 833 with a 5th gear OD.....?
I have the "clean sheet" Passon 855 5 speed. Passon had been modding the gearset in the 833 for years, which uses the factory transmission housing, etc.
The 855 is a whole new creation.
Mine has been great, and I'm going to be putting it to the test behind a 572 RB
 

Runcharger

Well-Known Member
Local time
12:42 PM
Joined
Apr 22, 2020
Messages
771
Reaction score
1,277
Location
Vernon
I like them. They are a bolt in as well, might not be great with a 340 or a 383 but they work well with a bigger engine.

injected.JPG
 

matthon

Well-Known Member
Local time
3:42 PM
Joined
Mar 3, 2018
Messages
1,100
Reaction score
829
Location
New York
Passon doesn't make, modify, create, or engineer anything. He did not create or engineer the A855, not at all, not even a little, by his own admission to me on multiple occasions, on the phone and in person, and corroborated by GFI multiple times on the phone and in person.

He is the front for GFI's and Huff's crappy business decisions and garbage parts and transmissions.

If you were lucky enough to get a 'good' trans, good for you, I hope you never have any issues, and you'll probably be trouble free.

Whether GFI built a good trans, consistently, in the past is debatable, however they definitely do not anymore, beginning at a minimum in 2018.
Cheap parts, poor machining, dishonest and arguably criminal business practices.
 

kiwigtx

Henchman #4
Staff member
FBBO Gold Member
Local time
7:42 AM
Joined
Jun 12, 2012
Messages
26,519
Reaction score
57,932
Location
NZ - just short of the South Pole
Passon doesn't make, modify, create, or engineer anything. He did not create or engineer the A855, not at all, not even a little, by his own admission to me on multiple occasions, on the phone and in person, and corroborated by GFI multiple times on the phone and in person.

He is the front for GFI's and Huff's crappy business decisions and garbage parts and transmissions.

If you were lucky enough to get a 'good' trans, good for you, I hope you never have any issues, and you'll probably be trouble free.

Whether GFI built a good trans, consistently, in the past is debatable, however they definitely do not anymore, beginning at a minimum in 2018.
Cheap parts, poor machining, dishonest and arguably criminal business practices.
Still not with what happened then ? :eek:
 

dodgedifferent2

Well-Known Member
Local time
3:42 PM
Joined
Oct 10, 2012
Messages
118
Reaction score
135
Location
thamesville ontario
I run the passon OD gearset in my 67 dart.
4.30 gear ratio
28" tire
340 stroker (418) Indy heads.

No complaints as I can cruise like I have 3.55. With fuel prices I am debating on gear ratio change.

Future plans for dart include a 400 stroker (512) but planning a t56 magnum this time.

340 drivetrain will end up in a 96 dakota
 

Dennis H

FBBO Gold Member
FBBO Gold Member
Local time
2:42 PM
Joined
Jul 11, 2010
Messages
16,031
Reaction score
20,962
Location
San Jose
I’d be 75 yo at delivery if I live that long. My pal in San Jose had to send his back East for repair. Twice. Jumped out of gear on acceleration.
 
Top