Tremec TKX 5 speed vs. A-833 4 speed....

[Joe Palmer]

I couldn't pass up the opportunity to compare these side by side...

The all new Tremec TKX 5 speed next to the famous Mopar A-833 4 speed....

 

[Darter6]

It's nice to have overdrive in a street car.

 

[davek]

they need to make it so you can use the Mopar bell housing. From what I see I would have to replace my drive shaft and new bell housing on top of the cost of the Tremac. Might as well; get Jamie Passion Performance with the 855 Passon Performance A-855 Five Speed Transmission

 

[71_Duster]

they need to make it so you can use the Mopar bell housing. From what I see I would have to replace my drive shaft and new bell housing on top of the cost of the Tremac. Might as well; get Jamie Passion Performance with the 855 Passon Performance A-855 Five Speed Transmission

How many years is the wait time for the A-855 at right now?

 

[MIKESPOLARA]

How many years is the wait time for the A-855 at right now?

You have to call to get on their waiting list. No thanks​

 

[Kern Dog]

The .64 overdrive gear really transforms the car. The noise and vibrations are greatly reduced and the driver fatigue is as well. Gas mileage does improve but for me, the car just felt easier to live with for freeway driving.

 

[Cheapsunglasses]

Excellent informative video.


Maybe someday I can get one, I’m using the 833od gears in an iron case, 1-2 isn’t ideal, but the od makes up for it, and of course you can’t beat $500

 

[davek]

Excellent informative video.


Maybe someday I can get one, I’m using the 833od gears in an iron case, 1-2 isn’t ideal, but the od makes up for it, and of course you can’t beat $500

did you just switched the gears in your stock 833? What do you mean by 1/2 not ideal?

 

[Cheapsunglasses]

did you just switched the gears in your stock 833? What do you mean by 1/2 not ideal?

Sorry for the confusion, yes I put the od gears in the iron case. the 3.09 1st gear, to 1.90 iirc 2 gear, rpm drop isn’t good.

 

[davek]

Sorry for the confusion, yes I put the od gears in the iron case. the 3.09 1st gear, to 1.90 iirc 2 gear, rpm drop isn’t good.

what are u running in the rear end?

 

[Sinitro]

The OD gears from Passon are 18 spline, 2.66 1st, 1.59 2nd, 1.0 3rd, 0.80 4th....
I think the ratios posted above are for the 23 spline OD trans used by Chrysler in the mid-70s for 6 cylinders and small V8s..

Just my $0.02...

 

[Cheapsunglasses]

what are u running in the rear end?

3.55s. With such a low 1st I can’t go lower, but 60mph is kinda too much for 3rd which is 1:1, and not enough for 4th, which is .73:1

The OD gears from Passon are 18 spline, 2.66 1st, 1.59 2nd, 1.0 3rd, 0.80 4th....
I think the ratios posted above are for the 23 spline OD trans used by Chrysler in the mid-70s for 6 cylinders and small V8s..

Just my $0.02...

Yes, the passion overdrive gears are way better, but a little expensive for me right now.

So I got the 23 spline od trans, that uses the same size front bearing as the 18 spline, so you have to have a machine shop cut a standard bell housing open, or you try to find the really expensive 18 spline bb bell house. But then you run into the issue of the hardened steel shaft beating up the aluminum case, because Chrysler decided bushings weren’t needed.

So you take a 23 spline 833, take the shaft and gears out, and put the od gears and shaft in. You get a 3.09 1st, 1.90 second, 1:1 3rd, and .73 depending on year and application 4th. And you end up with the poor mans overdrive. Sure 1st gear to second gear isn’t good, but it works, and you get to enjoy overdrive. My 440 was getting 12-13mpg with a 383 avs carb. (I know it was too lean, but it’s what I had and it’s undergoing changes to change that.)

 

[davek]

I trying to figure if you can machine 1st and 2nd gear to work with the OD. Or is it that you cant change the gears/wont work with different gears?

 

[Kern Dog]

I'm wondering how he got a 1.90 second gear. I thought there was a "cluster gear" that had cast in gears that could not be individually changed. Every 833 OD trans that I have seen had a 1.67 second gear ratio.

 

[Cheapsunglasses]

I trying to figure if you can machine 1st and 2nd gear to work with the OD. Or is it that you cant change the gears/wont work with different gears?

The ratios are different so the sizes if the gears are different and won’t work. You take the whole shafts and gear assembly’s.

I'm wondering how he got a 1.90 second gear. I thought there was a "cluster gear" that had cast in gears that could not be individually changed. Every 833 OD trans that I have seen had a 1.67 second gear ratio.

I could be wrong and have a 1.67 2nd. But I was thinking depending on application, 6cyl got 1.90, and v8s could be 1.67. I don’t claim to be an expert, I could have misread something

 

[davek]

A-833 Transmission Gear Ratios	1st	2nd	3rd	4th
6-cyl (also 64-65 273, 74-75 318)	3.09	1.92	1.40	1.00
Fine-spline V8 (most pre-1971)	2.66	1.91	1.39	1.00
Coarse-spline V8 (1966-70)	2.65	1.93	1.39	1.00
Coarse-spline V8 (1971-74)	2.44	1.77	1.34	1.00
Road Race T/A; most 1971-74 fine spline	2.47	1.77	1.34	1.00
Overdrive (mid-1970s and newer)	3.09	1.67	1.00	0.73

 

[T2R9]

That mid position sifter looks like it would be perfect for a 71 B with the bench. My neighbor just put one in his camaro and loves it. Still not alot of info on those in a Mopar yet.

 

[Cheapsunglasses]

@davek Sorry if I hijacked your thread with my Frankenstein 833 story.

 

[davek]

@davek Sorry if I hijacked your thread with my Frankenstein 833 story.

no I took it side ways was just curious on the OD,

 

[Cheapsunglasses]

There are many options for od in our Mopars, if you can swing it, the Tremec TKX looks like it fits like a glove.