300SD Trans Question
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300SD Trans Question - 3/31/2005 9:40:30 PM
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gregez
Posts: 6
Joined: 3/31/2005
Status: offline
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I'm getting ready to buy an old '81 300SD tomorrow in good shape. Everything works good and drives nice except when the trans shifts into high it slips for a second. No slips after it's in high gear or in any other gear . Only as it shifts to high. It has close to 300K on it I think. Engine was replaced and has only 150K. Any idea what I might be looking at? Trans rebuild?
Thanks for the help.
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RE: 300SD Trans Question - 3/31/2005 10:59:44 PM
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sleepwalker
Posts: 7080
Joined: 4/12/2004
From: Philippine Islands
Status: offline
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manual or auto?
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RE: 300SD Trans Question - 4/1/2005 1:04:18 AM
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gregez
Posts: 6
Joined: 3/31/2005
Status: offline
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Sorry, it's an automatic. I didn't know they made manuals for this model.
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RE: 300SD Trans Question - 4/1/2005 2:09:38 PM
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erfaniman
Posts: 29
Joined: 4/1/2005
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Yeah, i have an 81 300 SD that kinda sux at shifting gears. Dont worry about it too much unless you really think its a problem. AIM me at erfaniman if u have any questions about it.
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RE: 300SD Trans Question - 4/1/2005 2:33:41 PM
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gregez
Posts: 6
Joined: 3/31/2005
Status: offline
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Thanks for the reply. I am not familiar with these 300's but any time a trans is slipping it sounds like a prob to me. I guess i'm just wondering if it's a matter of filters or some other part needing replacement or what. If it's something that doesn't get worse too soon I can live with it. Was this a common prob or just, in this case, 300K of normal wear.
Thanks
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RE: 300SD Trans Question - 4/1/2005 3:37:25 PM
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Benzbob
Posts: 151
Joined: 2/25/2005
Status: offline
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My 87 300 D has the same issue. There is an adjustment (modulator valve) for slipping, or better known as flaring. I have tried to adjust the modulator valve to correct this but I haven't been able to. If I adjust the MV for harsher shifts in high gear, it makes the first 3 gear shifts bang too hard.
As these transmissions get high in the mileage, the disc's within the tranny (similar in function to a clutch) get worn and burned. I think the first stages of this wearing show up in upon the shifting point into 4th, or high gear, with flaring a bit until the disc's fully engage. Also, there is the possibility that an internal valve is getting sticky. There is available (AutoZone) a transmission additive that cleans the sticky varnish off all internal parts. I tried it, but it did nothing for me, but I have heard others say it worked like a miracle cure!
I just ease off the pedal a little bit until it's fully engaged into high and hope things wont change too much for another year or more. Rebuilt tranny's go anywhere from $1400 up.
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RE: 300SD Trans Question - 4/1/2005 11:17:12 PM
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erfaniman
Posts: 29
Joined: 4/1/2005
Status: offline
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Hey ben, could you specify on the engine cleaner you mentioned? thanks
ALi,
81 300SD 86 320 SDL 91 420 SEL all under 200k each
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