I love my 560SEL. I just replaced the original 250K mile transmission with a used unit with 160K miles. It was fine at first, but now it shifts perfectly when cool, but loses gears when it warms up after about 20 miles highway driving.

I believe that this has something to do with heat, indicating a cooling system problem. My mechanic believes its a pressure issue with warmer fluid with lower viscosity causing the problem.

Can either of these issues be corrected wiutho9ut replacing the unit? Transmission shops seem reluctant to repair transmissions, pushing you to replace, which I'd rather not due twice in a year.

Any feedback would be appreciated!

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1991 560SEL (254K miles)
1980 Lincoln Mark VI - Givenchy
1979 Lincoln Mark V Collector's Series
1979 Lincoln Town Car Collector's Series
1979 Ford "Effie" Pickup (in gradual transformation to a show/street truck)
1969 Lincoln Mark III (waiting for "Overhaulin" to call)
1989 Lincoln Towncar
2001 Lexus GS300 (spousal unit's daily driver)

I assume it is a 91 car?

What model transmission do you have?

You lose all the gears? correct? or will not drive out of first?

Martin

Well... it was a used unit. Did you drive the vehicle prior to install?

Are you certain the unit is full of ATF?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

A used unit with 160k could be 160k of aggressive city miles....no way of knowing what condition it was in unless tested or inspected before install....always a gamble if buying untested high miles parts.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I've saved alot of money by removing trans my self,and buying the rebuild kit.Then let a trans shop rebuild it.I look for a shop that can rebuild Mercedes Transmissions.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt