Mercedes-Benz Forum banner

1 - 10 of 10 Posts

·
Registered
2004 SL500, 1993 S420, 1990 420 SEL, 1985 500SE, 1994 Toyota Supra Aerotop
Joined
·
753 Posts
Discussion Starter #1
Hi,

Just having some odd transmission issues, a worn 380 engine was replaced with a healthy 500 engine, and I'm noticing flaring most of the time on anything but sedate acceleration and occasional slipping shortly after warm restart on an incline.

Is the 380 transmission ok for a 500? It has a new filter and has completely new fluid. I've replaced the vacuum modulator with a new one (red colour with the new style white adjustable cap) but maybe it's just allowing too much vacuum causing these issues. I have a Mity-Vac for testing, any advice would be helpful, thanks!
 

·
Registered
1989 mercedes 420 sel & 1995 volvo 850 t5 (just in case)
Joined
·
244 Posts
Far as i know m116s and m117s had different transmission bell-housing designs.
So it might not be a direct swap, not so sure about the internal similarities of a 116 n 117
auto.,

l
 

·
Registered
2004 SL500, 1993 S420, 1990 420 SEL, 1985 500SE, 1994 Toyota Supra Aerotop
Joined
·
753 Posts
Discussion Starter #3
I currently have the 117 engine and 116 transmission installed, I haven't noticed any problems mating them up.

I checked and they are different transmissions, the 500 has the 722.302 trans, while the 380 had the 722.310. They do still have the same modulator, so the one I bought is fine, I'll try adjusting this.
 

·
Registered
'82 500sec euro, '95 Ford F150
Joined
·
1,584 Posts
The 380 trans WILL fit the 500 motor, no problem. As long as you're running gen1 engine management, and you don't need the sensor that uses the flywheel. Your 380 trans should also have first gear start within the valve body.
 

·
Registered
1989 mercedes 420 sel & 1995 volvo 850 t5 (just in case)
Joined
·
244 Posts
Nice to know that 117 and 116 transmissions could be swapped.
I might have mistook for the iron and alloy block 116s and 7s.
 

·
Registered
380 sel
Joined
·
351 Posts
Harlz, my transmission was also misbehaving post transplant. I had changed the fluid and filter whilst it was on the floor. Everything matched and connected well, yet it still acted up. I seem to have cured my issues by simply adjusting 22 and 11. The Beast has some real pull now, Shifts well and kicks down on cue.....
 

Attachments

·
Registered
2004 SL500, 1993 S420, 1990 420 SEL, 1985 500SE, 1994 Toyota Supra Aerotop
Joined
·
753 Posts
Discussion Starter #7
Great, thanks for that I'll give that a go and hopefully that's the only problem, otherwise I'll try the modulator adjustment. When it does work normally, it is very quick!
 

·
Registered
Depends on the day!
Joined
·
13,337 Posts
Have you adjusted the modulator valve? what pressures are you running?
What fluid are you running?

Jonathan
 

·
Registered
2004 SL500, 1993 S420, 1990 420 SEL, 1985 500SE, 1994 Toyota Supra Aerotop
Joined
·
753 Posts
Discussion Starter #9
Hi, fluid is Valvoline ATF Dexron 3, I haven't adjusted the vac modulator yet, although it's a new one in the as supplied position as far as I know. I haven't checked any trans pressures, I don't have a kit for that but the vacuum level is around 20 HG.

Should I just take it to be adjusted by a dealer, or will they have no clue these days?
 

·
Registered
Depends on the day!
Joined
·
13,337 Posts
Crawl under car, pull rubber cap off mod valve. Turn T bar 360 degrees X 3.

Let me know how it shifts afterwards.

You might consider some B&M trick shift in place of your normal DMIII.

Jono
 
1 - 10 of 10 Posts
Top