I just got new tires on my car so I don't know if they are effecting this but at certain speeds my steering wheel starts to shake, at times my car vibrates a little and jumps up and down. This is on a 82 300sd.

Sounds like poor tire balancing to me. How'd it ride before the new tires?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

it ran well, it felt needed to be aligned with the old set of tires. i didnt' do it yet because i want to put larger rims on it but a lot of people say since it's a classic mercedes it should stay that way. do you know what the largest size is that i can put on it without messing up the tranny?

What is "massive help" ?

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'91 300-SEL

because i don't know if this is a small problem that can cause a large problem and cause a accident. I dont' know about cars so since it does this crazy shaking i don't know if it means something is going to break and then i go flying into another car

Make sure the lug nuts holding the tire on are tight. It's not too uncommon for the tire-shop boys to miss a tire.

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Matt
Seattle, WA
87 420SEL
83 300D
69 Dodge Charger
64 GMC C10 truck

[QUOTE=82benzo] at times my car vibrates a little and jumps up and down. QUOTE]

Sounds like your car is equiped with hydraulics. That would explain your desire for big rims.

Take it to the dealer and have them do an alignment and balance job. It's expensive, but I've never had another shop do it right.

Forget big rims, unless you are going for the high-schooler/wannabe rapper look.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E

Better yet. Losen all the lug bolts and retorque with a torque wrench because they are probably all to tight. Also check the steering damper.

John Roncallo