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  #1  
Old 11-01-2009, 07:47 PM
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722.4 and 722.3, interchangeable?

I have an '87 300sdl with a dead 722.3 trans. There is a 722.4 for sale locally from a diesel car. Will these transmissions swap out? The 722.4 is in a '90 300d 2.5 turbo.
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  #2  
Old 11-01-2009, 08:07 PM
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No. The 722.4 is a significantly weaker transmission that can't hold the power of your engine.
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  #3  
Old 11-01-2009, 08:26 PM
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ok, but would it work for long enough to rebuild the other?
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Old 11-01-2009, 08:32 PM
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Benz Model/Engine
--601 series--
-84-85 190D 2.2 chassis 201.122 /engine 601.921
72hp @ 4200 rpm, 96 ftlbs @ 2800 rpm

--602 series--
-86-89 190D 2.5 chassis 201.126 /engine 602.911
non-turbo 93hp @ 4100 rpm, 122 ftlbs @ 2800 rpm
-87 190D 2.5 TD chassis 201.128 /engine 602.961
turbo 123 hp @ 4600 rpm, 168 ftlbs @ 2400 rpm
-91 300d 2.5 Turbo Diesel chassis 124.128 /engine 602.962
turbo 121 hp @ 4600 rpm, 165 ftlbs @ 2400 rpm

--603 series--
-86-87 300SDL chassis 126.125 /engine 603.961
148 hp @ 4600 rpm, 201 ftlbs @ 2400 rpm
-91 350SD chassis 126.134 /engine 603.970 <--- 3.5L TD - BEWARE
150 hp @ 4000 rpm, 229 ftlbs @ 2200 rpm
-87 300d 3.0L chassis 124.133 /engine 603.960
143 hp @ 4600 rpm, 195 ftlbs @ 2400 rpm

this from wagoneers.com, 25hp difference? I don't think it'd break that fast.

Torque capacity
The designation W4A0xx tells us the maximum input torque in kpm (kilopondmeter).
1kpm=7.23lb/ft.

722.0 (W3A040)- 290lb/ft
722.1 (W4B020 or W4B025)- 145/180lb/ft
722.2 (W4B025)- 180lb/ft
722.3 (W4A040)- 290lb/ft
722.4 (W4A020)- 145lb/ft
722.5 (W5A030)- 216lb/ft
722.6 (W5A580)- 578lb/ft

G-models
720.1?x (W4A018)- 130lb/ft
722.39x (W4A028)- 202lb/ft
722.61x/63x (W5A330)- 216lb/ft (Used W5A580 in the larger engine models)

Note: The 300D/TD/CD/SD from October 1984-on (with the 2.88 rear end) used the weaker 722.4 transmission.

that from superturbodiesel.com, guess it would break.

Last edited by wyldemannn; 11-01-2009 at 08:41 PM.
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  #5  
Old 11-02-2009, 02:35 AM
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722.6 (W5A580)- 578lb/ft

i'm guessing this is the getrag with the dog leg 1st gear?
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  #6  
Old 11-02-2009, 02:41 AM
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No, its a computer controlled 5-speed automatic. Getrag makes manual transmissions (717).
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  #7  
Old 11-06-2009, 05:51 AM
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Quote:
Originally Posted by wyldemannn View Post
I have an '87 300sdl with a dead 722.3 trans. There is a 722.4 for sale locally from a diesel car. Will these transmissions swap out? The 722.4 is in a '90 300d 2.5 turbo.
interesting.. Howcome can a 2.5td engine with 168lbs/ft be delivered with a 722.4 tranny speced to 145lbs/ft torque?

Just curious cuz I have a european 190e 2,5td automatic. 1988. No egr, no electronic idle, no nuthin gadgets. I belive Rear end ratio is 2.65. ~2500rpm@62mph.

Do I have the bad 722.4 or the good .3 tranny? I have 7mm tuning plans, so I hope for the beefy..
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  #8  
Old 11-06-2009, 08:57 AM
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Quote:
Originally Posted by lars1 View Post
interesting.. Howcome can a 2.5td engine with 168lbs/ft be delivered with a 722.4 tranny speced to 145lbs/ft torque?....,..
Yes I've question that info on post # 4 before. I don't think it is accurate.

You do have the 722.4 and will probably have to do some research to see the proper torque rating for it.

To wyldemannn, I would think it would work on a temporary basis until you get your proper trans rebuilt. It will not last very long though, so get your 722.3 trans build sooner than later.
You will need to get the 722.4's torque converter because it is different than the 722.3. Smaller input and different splines.

The only thing I would be worried about is the length of the trans. Although the .4 is physically smaller then the .3, I think the length would be the same. But don't quote me on it.



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Last edited by DeliveryValve; 11-06-2009 at 09:05 AM.
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