wWill 300e 722.320 (stock 4 sp) bolt to W126 500 sec (M117 engine)? - PeachParts Mercedes-Benz Forum

BAD300 · #1 07-04-2011, 02:55 AM

As title says, will the 722.320 4 sp auto trans bolt to the M117 engine. Car in question is an 80's 500 SEC

Thanks!

Stretch · #2 07-04-2011, 10:28 AM

Posts 9 and 10 in this thread might help:-

Transmission swap - 1982 turbo 300D

Transmission versions listed per chassis type rather than engine type...

BAD300 · #3 07-04-2011, 06:21 PM

Quote:

Originally Posted by Army

Posts 9 and 10 in this thread might help:-

Transmission swap - 1982 turbo 300D

Transmission versions listed per chassis type rather than engine type...

Not really a help Amy but thanks for the link. I need to know whether the 722.320 (300e/W124) will bolt to 500SEC/w126 chassis, not what the obvious fitments are. Like a match list. Why bdid Merc have so many different transmissions for so many different models

I mean, couldn't 1 4sp fit a few cars?

Stretch · #4 07-05-2011, 04:59 AM

Quote:

Originally Posted by BAD300

Not really a help Amy but thanks for the link. I need to know whether the 722.320 (300e/W124) will bolt to 500SEC/w126 chassis, not what the obvious fitments are. Like a match list. Why bdid Merc have so many different transmissions for so many different models

I mean, couldn't 1 4sp fit a few cars?

A custom match list - I don't know about that. That's a difficult one. It has taken me ages to find out that a 722.3 transmission is in fact the same length as a 722.1 but that the rear mount is in a different position so you need a slightly different bracket. I think this bracket was actually made by MB so I'm now searching for a part number...

As for so many transmission models - well the most of the differences within a series seem to be related to shifting points for a particular engine. A 722.112 for example was "tuned" to shift for a 2.8 litre petrol engine, whilst a 722.118 was "tuned" for a diesel. The basic carcase and gearing inside is the same (albeit with very slight changes) and for the situation of the 722.112 an extra lever on the right hand side of the trans... but anyway I'm babbling.

So here is how I would go about finding the answer.

1) Find out the chassis number of the 500SEC and see which transmission was meant to be fitted. May be the information in the link that rs899 posted can help

2) Then try and find out the difference between the transmission you want to fit and the one that Mercedes fitted.

If a 722.3 was fitted to the 500SEC then I guess you'll find that it will physically fit.

Stretch · #5 07-12-2011, 08:14 AM

How are you getting on with this?

I saw a picture of a 722.3 automatic gearbox for a 500SEC the other day whilst browsing through some classifieds and I saw that that gearbox had two starter motor "ears" on the casing. One on either side. Sorry I can't find the picture now of course - but if you look here on this advert for a 300 SE / SEL you can see a 722.3 with a starter motor ear on the left hand side - rather than the 722.303 (for a diesel engine) which has the ear on the right hand side:-

http://link.marktplaats.nl/463652783

It looks like it is more complicated than I thought. I still think if you can find the chassis numbers you'll get a better idea from the list of gearboxes posted by rs899 in the link I posted above.