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Author Topic: 4th speed on automatic transmission stopped working  (Read 1902 times)

jesraymond

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  • USA, NJ, Clifton
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4th speed on automatic transmission stopped working
« on: December 06, 2020, 13:07:21 »
4th speed on automatic transmission stopped working. Fluid level good transmission works fine otherwise anyone have any recommendations? Do I  Need a transmission rebuild The car is a 1970 280 SL
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JamesL

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Re: 4th speed on automatic transmission stopped working
« Reply #1 on: December 06, 2020, 13:37:18 »
Are you sure?
They normally start in 2nd, so only change gear twice.

What sort of RPM are you seeing at 40mph? 50?
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James L
Oct69 RHD 280 in DB906 with cognac leather

jesraymond

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  • USA, NJ, Clifton
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Re: 4th speed on automatic transmission stopped working
« Reply #2 on: December 06, 2020, 13:40:47 »
I’m running about 3000 RPMs between 40 and 50 miles an hour
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Tyler S

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Re: 4th speed on automatic transmission stopped working
« Reply #3 on: December 06, 2020, 18:44:50 »
Does it also shift late and hard? There may be an issue with the kickdown solenoid or switch stuck
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1968 (67) 250sl. 4 speed manual. DB180 Silver
1955 220 Cabriolet A. White Grey
2019 E450 Wagon. Majestic Blue
1936 Ford PU Flathead V8. Creme on tan interior.
1989 Volkswagen T3 Westfailia Campmobile. Dove Grey (blue)

Shvegel

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Re: 4th speed on automatic transmission stopped working
« Reply #4 on: December 07, 2020, 03:29:33 »
d guess you 3 position solenoid is stuck. Essentially your transmission thinks you are mashing the gas pedal.  Been written about a bunch here so search it and free it up.
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ja17

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Re: 4th speed on automatic transmission stopped working
« Reply #5 on: December 08, 2020, 00:12:09 »
Sometimes, just the kick-down-button on the floor gets stuck down. It's easy to check this first.
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback
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