Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 07-29-2014, 01:11 PM
Ped Ped is offline
Registered User
Join Date: Jul 2014
Posts: 1

Hi there!

I've just replaced the flex disc/hardy disc on my 300TE, 89. Hoping this would reduce my hard shifting. But no...
  • Hard "thunk" when going into R or D (Makes my brakes "sqiiiiik")
  • Hard "thunk" in all the gears upwards, down a bit better
  • Better when very low trottle

It could feel like it might be the diff, since when I was turning the propeller-shaft it seems like I could replicate the "thunk" - it was from turning first one way, and then quickly change direction. - not totally sure about this, was sweating under the car in 30'c - but will follow up on this.

I've been reading about checking vacuum pressure and adjusting the modulator.
I've read these two pages: and Mercedes-Benz Transmission, Steve Brotherton, ImportCar, February 2002 but they are for the 722.4 and/or diesel. But I'm having difficulty in figuring out where to plugin a test Gauge and what the pressure should be?

Could a gauge like this work: ? and where to plug it in?

I also have a vacuum "fuel efficiency" gauge, which works as it should, had a leak once, fixed it, but no change in the shifts. But I don't know if its related to the gearbox vacuum or usefull to leak finding.

The other things I will try is changing the oil and look closer on the diff/driveshafts. But I would really want to know about the vacuum is fine for the gearbox

Reply With Quote
Old 08-02-2014, 11:51 PM
Registered User
Join Date: May 2007
Location: Arizona
Posts: 760
Welcome to the forum. There are a number of good suggestions in this link that may help.
1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
Reply With Quote
Old 08-03-2014, 08:13 AM
oldsinner111's Avatar
lied to for years
Join Date: Nov 2008
Location: bristol,tn
Posts: 6,079
might check if vac is going to transmission
anti matter asteroids matter too
Reply With Quote
Old 08-03-2014, 02:35 PM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,424
Yes, check vacuum levels at the modulator on the transmission, also, what is your engine idling at in park? If its idling too high its going to slam into reverse and drive. An M103 should idle around 700 in park and about 550 in drive or reverse....
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 101k - mine - (OC-104,600)
'17 Metris(VITO!) - 24k - wifes (OC-25k)
'09 Sprinter 3500 Winnebago View - 57k (OC - 63k)
'13 ML350 Bluetec - 72k - dad's (OC-75k)
'01 SL500 - 92k(km) - dad's (OC-94,000km)
'16 E400 4matic Sedan - 107k - Brothers (OC-108k)
Reply With Quote
Old 08-04-2014, 01:23 PM
johnflight1's Avatar
Registered User
Join Date: Aug 2002
Location: Las Vegas Nevada
Posts: 260

on my 300E 1988 the 2 rubber bushings that hold the back of the rear diff are shot. It makes a clunk when going into drive or park,also when I hit the kick down while accelerating or taking my foot out of it during acceleration it is very bad!
Jack up the back of thre car and release the park brake but leave the trans in park so the drive shaft does not turn.have someone turn one of the tires back and forth while watching the bushings to see if the diff jumps up and down you will know right away if they are shot

88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 05:41 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page