Which Gear Two Choose???

[wscheffer]

Hello Everyone,

On my (W126) 1987 420 SEL I noticed that in a certain revolution range my transmission boggles before engaging into the next highest gear. This usually occurs at about twenty to twenty-five mph with my foot performing a normal acceleration.

Sorry can’ t give you the RPM range since I still have to fix my tachometer and that will be an up coming thread!

If I drive more aggressively no boggle.

If I drive less than normal “grand paw mode” no boggle.

I have recently changed the transmission fluid and filter along with the vacuum controlled modulator valve.

I don’t think this is normal or is it?

 

[television]

It sounds a bit like a vacuum problem.

http://www.detali.ru/cat/oem_mb2.as...706&VIN=*&CT=GA&cat=09Y&SID=27&SGR=001&SGN=01

 

[wscheffer]

Yes, Malcolm I was thinking of buying a new vacuum hose that connects from the motor to the modulator valve.

Mine must have cracks in it.

It's not that uncommon type of thing and I should have anticipated this when I replaced the modulator valve last weekend. Upon doing this the shifts got better but the problem was not fully resolved.

I just thought I would throw this out here to see what someone else thinks.

Thanks!