NP833 O.D. problems, who has had them
#2754608
03/22/20 03:50 PM
03/22/20 03:50 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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I've been putting together a street car, 1966 Dodge Coronet Deluxe 2 door sedan that I installed a NP833 tranny, 440 motor and a cut down Dana 60 with 3.55 gears in it. I took the tranny completely apart to inspect it as I bought it out of a local towing and scrap yard, I didn't find any real problems in it but I was amazed on how small the O.D. gear is on the cluster shaft. My questions are who has had problems with them or broken one on the street? What problems did you have and do you know what parts broke? Thanks: Cab
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: NP833 O.D. problems, who has had them
[Re: Cab_Burge]
#2754697
03/22/20 06:53 PM
03/22/20 06:53 PM
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Joined: Jan 2003
Posts: 12,287 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,287
Benton, IL.
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I have installed several of them in our dinosaurs over the years and have had good luck with them. But they won't take a beating. As long as there is limited traction and not much gear banging, they work real well with deeper gear ratios. With taller rear gears, the tranny's gear spread starts to show up.
Master, again and still
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Re: NP833 O.D. problems, who has had them
[Re: 1E2C]
#2754761
03/22/20 09:01 PM
03/22/20 09:01 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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The real problem is wear on the countershaft, as it uses thrust washers, not tapered bearings, and has no center support between input and output shaft, like a modern trans, so they get loose with big power or towing in overdrive. Use gear oil, change it often, don't beat on it in overdrive, and it will last a long time. Start with new thrust washers, bearings, needles, countershaft pin, and shim any excess endplay out of the cluster gear and run it. Just remember it was designed for a light 6cyl car so.... one last thing, check the ends of the cluster, may be worn from thrust, or wiped washers and metal.
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Re: NP833 O.D. problems, who has had them
[Re: 4406bbl]
#2754798
03/22/20 10:41 PM
03/22/20 10:41 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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When you say countershaft are you saying the cluster gear shaft or the output shaft?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: NP833 O.D. problems, who has had them
[Re: lemondana]
#2754893
03/23/20 09:10 AM
03/23/20 09:10 AM
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Joined: Jan 2003
Posts: 12,287 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,287
Benton, IL.
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The OP asked for experiences. And he has gotten enough and they have been consistent enough to draw a reasonable conclusion. But an expressed opinion without that experience is really just a guess. And not a good source for advice.
Master, again and still
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Re: NP833 O.D. problems, who has had them
[Re: DaveRS23]
#2754897
03/23/20 09:20 AM
03/23/20 09:20 AM
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Joined: Jan 2003
Posts: 10,759 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,759
North Dakota
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I had one in a '77 Volare with the 318 that I bought brand new. The comment about being a PITA with deep rear end gears is correct. IIRC, the rear end was a 3.21 limited slip and you were in 1st gear only long enough to say you had been there. After I had about 40,000 miles on it, it developed a nasty trick of sticking in fourth gear if you hit it hard. Never did discover what was happening. Went through the shifter linkage adjustment and a side cover inspection but never discovered the cause. I really like the car though. If I was younger I'd probably be looking for a Roadrunner version.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: NP833 O.D. problems, who has had them
[Re: 6PakBee]
#2754908
03/23/20 09:37 AM
03/23/20 09:37 AM
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Joined: Jun 2018
Posts: 350 Mequon, WI
gzig5
enthusiast
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enthusiast
Joined: Jun 2018
Posts: 350
Mequon, WI
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I had one in a '77 Volare with the 318 that I bought brand new. The comment about being a PITA with deep rear end gears is correct. IIRC, the rear end was a 3.21 limited slip and you were in 1st gear only long enough to say you had been there. After I had about 40,000 miles on it, it developed a nasty trick of sticking in fourth gear if you hit it hard. Never did discover what was happening. Went through the shifter linkage adjustment and a side cover inspection but never discovered the cause. I really like the car though. If I was younger I'd probably be looking for a Roadrunner version. I had a 77 Aspen RT with the 318 and the 833 OD. That car got beat on pretty well and the trans held up until it had 95,000 miles and then it got stuck in second or third gear. My dad took it into his machine shop at work and they corrected whatever was wrong with it without buying parts. I recently had a guy tell me he had one in a 440 Challenger that would lift the left front tire and it lived in that application. I've got one to put in my 73 Cuda and as long as I can live with the ratio spread I'll keep it. I can't afford a Passon or Magnum swap.
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Re: NP833 O.D. problems, who has had them
[Re: gzig5]
#2755000
03/23/20 12:50 PM
03/23/20 12:50 PM
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Joined: Jun 2014
Posts: 1,340 VA
dragon slayer
pro stock
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pro stock
Joined: Jun 2014
Posts: 1,340
VA
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The aluminum case OD do have the floating cluster shaft and wear easier. Cast Iron case do not have a floating shaft. First gear is a very low gear at 3.09, hence no need to even use it with a big block. The only real difference if put in a cast case, is the main shaft is thinner for at least one of the gears. So if anything was going to break it would that in my opinion. This is not a setup for track car, but inexpensive option for a cruise OD car. I have a 383 4 spd B body that has a dana with 3.54. The motor trans are stock set up. I hardly use first gear even with a stock 383/4 spd. With the over drive, I would expect it to be two speed with overdrive. But if you wanted to pull a cool hole shot in first gear, what a ratio with a 3.54.....
Last edited by dragon slayer; 03/23/20 12:51 PM.
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Re: NP833 O.D. problems, who has had them
[Re: dragon slayer]
#2755039
03/23/20 02:05 PM
03/23/20 02:05 PM
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Joined: May 2019
Posts: 6,324 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,324
nowhere
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Teaching my son to drive in a 51 Plymouth with a three on the tree. Going to put in an A833OD I have on the shelf, that 3.09 first gear will really help him taking off, lol. I don't pull hole shots or tow so the A833OD works fine for me, I probably have close to 200k miles on the two I have. As for the aluminum case counter shaft hole issue, it can be bushed to fix that. I believe both Passon and Brewer's offer that service or did. https://www.hotrod.com/articles/mopp-0110-a-833-aluminum-case-buildup/
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Re: NP833 O.D. problems, who has had them
[Re: lemondana]
#2755262
03/23/20 11:02 PM
03/23/20 11:02 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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I've seen 2 of them from behind Slant 6's that looked like a grenade went off inside them. I personally would never use one! I would have to see that with my own eyes to believe it.
Mo' Farts
Moderated by "tbagger".
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