W108 280se transmission won't kick up into forth

1965 - 1972: 250S, 250SE, 300SEb, 280S, 280SE, 280SEL, 280SE 3.5, 280SEL 3.5, 280SE 4.5, 280SEL 4.5, 300SEL, 300SEL 6.3, 300SEL 3.5, 300SEL 4.5
Post Reply
hodgenst23
Dernburg Wagon
Posts: 9
Joined: Thu 27 Apr, 2017 11:58 am
Model you own: w108

W108 280se transmission won't kick up into forth

Post by hodgenst23 » Fri 28 Apr, 2017 12:23 pm

Hey, I've just realised lately on the freeway, I hardly take it on the freeway, that the motor is revving quite high and not kicking up into 4th. To be honest I've already thought it was a three speed but now that I've done some research I'm definitely wrong. All other gears are fine just a tad slow because it's an old box that probably wasn't maintained very well by the previous owner. I'm hoping it's just an adjustment issue and nothing major.
What are people's thoughts?
Cheers


Sent from my iPhone using Tapatalk

CraigB
OZBENZ Admin
Posts: 4841
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: W108 280se transmission won't kick up into forth

Post by CraigB » Fri 28 Apr, 2017 7:12 pm

I reckon you are in fourth and having the same mind adjustment of me and others that Benz designed them to be high revvers at higher speeds. If you are in D, your car will take off in 2nd. If you want to take off in first, hold it down in L or 1 or whatever your selector says and it will take off in its super low first. Some people track down a taller diff from a V8 so it sounds more relaxed but its something i would never do. These big old girls perform fantastically, great power for passing and with hill work etc. to me it all seems in the right place. I have taught myself to listen to those higher revs as a lovely mechanical sound, particularly with the more open exhaust on my 280sl pagoda. I wouldn't want that six to have to work with the taller gearing that Benz engineers designed for the gruntier V8. But each to their own. A lot easier if you can adjust your mind that the high revs compared to falcon holden etc is a good sound and not a bad noise!
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

ibast
S Class
Posts: 75
Joined: Wed 16 Mar, 2016 7:18 pm
Model you own: w108
Location: Sydney

Re: W108 280se transmission won't kick up into forth

Post by ibast » Mon 01 May, 2017 3:24 pm

Yeah mine sounds way too busy in 4th. And first only engages if I only jump on it off the lights. So it drives like a busy 3 speed.

You can check if you are in 4th, by popping it back to 3rd (at say 70) and see if it gets more frantic.

CraigB
OZBENZ Admin
Posts: 4841
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: W108 280se transmission won't kick up into forth

Post by CraigB » Tue 02 May, 2017 1:06 am

Too busy, too fast, too slow - its all subjective - compared to? I thought exactly the same thing with my first one though. To change it so it 'sounds' right I think you are risking performance and economy, although some have done it and may be able to comment better. Particularly back in those times the MB engineers would have had good reason to set it up that way - would not have cost them any more to put in a taller diff ratio but all of them had that 3.69 I think it is until the V8 came out. My head is totally adjusted to it now - the 500/560 lope along with 2.24/2.47 but the 108 has that almost sportier feel with fluid coupling and a motor that loves to rev.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

User avatar
Mercmad
Mercedes Demigod
Posts: 8023
Joined: Sun 11 Sep, 2005 9:01 pm
Model you own: w109
Location: Brissy
Contact:

Re: W108 280se transmission won't kick up into forth

Post by Mercmad » Tue 02 May, 2017 11:20 am

Check the throttle position rod and the wiring from the kick down to make sure it isn't shorting.At 50kph it should go into top unless the TPR is not adjusted right.

CraigB
OZBENZ Admin
Posts: 4841
Joined: Thu 23 Jun, 2005 2:18 pm
Model you own: I own multiple different models
Location: Hawthorndene (Adelaide)

Re: W108 280se transmission won't kick up into forth

Post by CraigB » Tue 02 May, 2017 2:48 pm

Yes but if you go back to the initial post, It sounds like in normal use it is operating fine as a '3 speed' which is correct. You only find that first gear if you hold it with that gear lever from the start. This identical response has been raised so many times, including my own initial response over 20 yrs ago when i first drove one. From a stanstill can you count 3 gear changes? If you hold it back with the gear lever and try it again can you count 4 as your use the lever to change through gears? If so there is nothing wrong, even if it doesn't rev super low on the open road like modern cars or your period local products.
Craig Baulderstone
Lurch
280s's
280SE3.5
280SL
350SL
500SEC's
560SEL's

User avatar
Mercmad
Mercedes Demigod
Posts: 8023
Joined: Sun 11 Sep, 2005 9:01 pm
Model you own: w109
Location: Brissy
Contact:

Re: W108 280se transmission won't kick up into forth

Post by Mercmad » Tue 02 May, 2017 11:07 pm

If it is indeed shifting into top and and not starting in first because of a badly adjusted TPR I would suspect the engine mounts are shot and engine noise is getting into the car .

Post Reply

Return to “W108/109”