93 D350 Cummins W/Overdrive Issues ???
#2961114
09/05/21 12:13 AM
09/05/21 12:13 AM
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Joined: Mar 2007
Posts: 2,525 Louisville, KY
E-Ticket
OP
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OP
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Joined: Mar 2007
Posts: 2,525
Louisville, KY
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OK, so, I went through several pages on this truck forum and only found one question regarding the OD transmissions but didn't really apply to my question. The truck is a 93 D350, Cummins, 2WD with an OD trans. When the OD doesn't work, is it alright to wire the switch to stay activated ??? I've driven the truck with the switch wired/bypassed and it seems to be alright that way ??? Before we wired it direct to stay on ... the trans would buck & kick like it couldn't see the signal to go in overdrive ?? I've occasionally seen posts regarding the OD on this era of truck but never paid any attention to the details because I've mostly had stick trucks ... Thx in advance ...
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Re: 93 D350 Cummins W/Overdrive Issues ???
[Re: E-Ticket]
#2961152
09/05/21 07:56 AM
09/05/21 07:56 AM
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Joined: Dec 2014
Posts: 5,777 ohio
ruderunner
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ohio
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The factory dash switch is to turn off OD. It sends a signal to the computer to lock out OD.
You can indeed wire the solenoid for manual control. It won't hurt the transmission.
Angry white pureblood male
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Re: 93 D350 Cummins W/Overdrive Issues ???
[Re: ruderunner]
#2961176
09/05/21 10:03 AM
09/05/21 10:03 AM
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Joined: Mar 2007
Posts: 2,525 Louisville, KY
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OK, thx ... That is my main concern. As long as we keep the switch on/wired to bypass and operating as an on/off switch, t seems to be alright. The factory dash switch is to turn off OD. It sends a signal to the computer to lock out OD.
You can indeed wire the solenoid for manual control. It won't hurt the transmission.
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Re: 93 D350 Cummins W/Overdrive Issues ???
[Re: E-Ticket]
#2961275
09/05/21 04:02 PM
09/05/21 04:02 PM
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Joined: Dec 2009
Posts: 20,630 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,630
in a cattle trailer down by th...
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It certainly won't hurt it, but it is a PITA. You have to turn it off if you want the trans to downshift and if you leave it on when coming to a stop it stays locked up, shudders and shakes until it shifts to first. 99% of the time O/D shifting hunting or inoperative conditions are caused by the TPS. Could also be a CKPS or a VSS. If it was a crank sensor though the A/C compressor won't kick on. If it's a VSS then the cruise won't work. I know the TPS isn't cheap but it isn't super expensive either. Geno's Garage carries them.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 93 D350 Cummins W/Overdrive Issues ???
[Re: Guitar Jones]
#2961462
09/06/21 06:48 AM
09/06/21 06:48 AM
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Joined: Dec 2014
Posts: 5,777 ohio
ruderunner
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master
Joined: Dec 2014
Posts: 5,777
ohio
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I don't think OD engagement will cause a shake, TCC will. Iirc the internal plumbing prevents OD engagement in first and second, the OD solenoid doesn't get pressurized oil until the transmission reaches 3rd gear. This seems like it effectively keeps the transmission a 3 speed but with a really wide spread between 2nd and OD as it basically would skip 3rd altogether.
Angry white pureblood male
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Re: 93 D350 Cummins W/Overdrive Issues ???
[Re: ruderunner]
#2961470
09/06/21 07:49 AM
09/06/21 07:49 AM
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Joined: Dec 2009
Posts: 20,630 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,630
in a cattle trailer down by th...
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You are correct, mine has lockup and I was thinking like that.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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