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#1
10-24-2006, 12:46 PM
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can 722.5 OD unit be changed alone?
the overdrive unit on my 1990 300 sl w/a 722.5 transmission is shot, for about two weeks it wasnt working (everything was fine just wouldnt shift to 5th), and yesterday it really failed (made bad metal grinding noises and car wont move).
the unit looks to be mounted to the back of the transmission and i wondered if it was self contained and if it could be replaced w/o going into the main body of the transmission thanks 
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#2
10-24-2006, 01:27 PM
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No, requires complete disassembly of the trans.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
10-24-2006, 03:26 PM
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I'd be surprised if it didn't take a number of other components in your trans along with it..
Jonathan
__________________
Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#4
10-24-2006, 05:27 PM
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here's the problem.it can be accessed by taking the back off the trans and there you find the drum which contains the clutches for 5th.if you remove it or empty out the clutches you will have trouble with reverse.
__________________
David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#5
10-24-2006, 09:23 PM
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i have the over drive unit off and the splines on the
sunnen (?) gear in the planatary(?) gear are sheared off. do you think i can just replace the planatary gear set up?
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#6
10-30-2006, 03:38 AM
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Is the 722.5 fully mechanical?
__________________
I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#7
10-30-2006, 08:10 AM
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5th is electronically controlled.
Jonathan
__________________
Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#8
10-30-2006, 08:11 AM
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What does it rely on to shift into 5th?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#9
10-30-2006, 08:30 AM
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I think just a basic 12v signal...never studied it much as the transmission wouldn't hold up under the application I would like it to.
Jonathan
__________________
Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#10
10-30-2006, 08:32 AM
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Quote:
Is it that much weaker than a 722.4?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#11
10-30-2006, 08:33 AM
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Yes, much. 5th gear doesn't even last under a standard M104's power/torque..so it's out for anything w/ some serious grunt.
Jonathan
__________________
Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#12
10-30-2006, 08:35 AM
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Hrm. Well, would it work fine for a cruise gear?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#13
10-30-2006, 08:49 AM
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Every transmission guy I talked to said No. The 5th gear is grossly undersized and when it goes it typically takes the rest of the transmission with it..An expensive proposition w/ the 722.5's.
My advise, use a .3 and a gear vendors overdrive. It's not cheap, will require a custom adapter plate but you can make it all Bullet proof. Jonathan
__________________
Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#14
10-30-2006, 09:01 AM
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Ah okay. Well to heck with the .5 then.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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