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'88 D100 Trans Problem

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Old 10-31-2009, 12:19 AM
HeliDeiter HeliDeiter is offline
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Join Date: Oct 2009
Vehicle: 88' Dodge D100
Location: Phoenix
Posts: 35
Default '88 D100 Trans Problem

Recently picked up a D100 2WD 318 Automatic project truck, the transmittion is giving me problems. Occasionally there will be a delay before shifting gears, the motor will run up then after a couple seconds it'll shift hard into second. The rest of the gears seem fine.

Anyon else have this issue? If so how did you fix it?


What transmition do I have incase I have to replace it?
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Old 10-31-2009, 12:46 AM
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crazzywolfie crazzywolfie is offline
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Join Date: Jun 2009
Vehicle: 91 & 81 d150 carburated 318's 93 R.C. F.I.318
Location: orangeville ontario
Posts: 6,780

the most common transmition is the 727 but they also came with other transmition. you would have to pull the numbers off the transmition. if the transmition shifts late and the shifts are harsh, suspect a faulty vacuum diaphagm. have you checked the fluid level?
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Old 10-31-2009, 07:45 AM
HeliDeiter HeliDeiter is offline
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Join Date: Oct 2009
Vehicle: 88' Dodge D100
Location: Phoenix
Posts: 35

I checked the level cold and it showed full, ran the truck for a few min and shifted through the gears and it showed very low.

Thanks crazzywolfie!
Looks like I'll be buying some fluids.
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Old 11-07-2009, 10:38 PM
SouthernEngineering76 SouthernEngineering76 is offline
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Join Date: Sep 2009
Posts: 11
Default Not really a cheaper solution

I have a 76 D100 that I'm currently working on and the transmission was doing the same thing. On mine it was a 727 and I just had it rebuilt, $406.78 later its shifting like a champ. Although mine had a couple more issues than just shifting.
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Old 11-07-2009, 11:25 PM
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charlie1935 charlie1935 is offline
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Join Date: Mar 2004
Vehicle: 96 Ram standard cab, short bed, 318 auto. tranny. 87 D100, long bed, 318 auto. 87 5th Ave. 318.
Location: DuQuoin,IL.
Posts: 1,977

No vacuum modulator on a mopar tranny.
Grandpas like toys too
Calling an illegal alien an 'undocumented immigrant' is like calling a drug dealer an 'unlicensed pharmacist'
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Old 11-08-2009, 03:21 PM
tooltime tooltime is offline
Join Date: Mar 2009
Vehicle: 1988 Dodge D 100 with a 3.9 5 speed and wife has a 2001 Dodge Durango slt 4wd i want it and she don'
Location: Mt Airy NC
Posts: 419

On my truck it has just started acting like it is out of gear when i am at a stop light/sign. What does that sound like? It is a 86 auto with a 318
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d100, hard shifting, transmittion

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