518 shifts into 4th by itself?
#2634356
03/19/19 10:53 AM
03/19/19 10:53 AM
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Joined: Jan 2003
Posts: 1,771 Jamestown, Indiana
James74
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,771
Jamestown, Indiana
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Put a non lockup 518 in my 74 road runner last summer. Wired up the OD solenoid with a toggle switch. Once I got driving the car, I found that the transmission will shift into 4th without the switch, and then slips if I try to get it to downshift by accelerating. I completely unhooked the power and the ground, so that there is no power going to the solenoid. The transmission will still shift into 4th by itself. Is this the OD solenoid, or a problem with something in the transmission? I thought if its just a valve body fix, I might try to fix it and drive it this summer. If I have to pull the transmission, I will probably just get it rebuilt. Engine is a 400/451, hughes 3k converter, jvx adapter, new 3.73 gears. Transmission is unknown condition; although I put a transgo kit in it before the install. Thanks for any help!
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Re: 518 shifts into 4th by itself?
[Re: James74]
#2634647
03/19/19 11:43 PM
03/19/19 11:43 PM
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Joined: Aug 2003
Posts: 954 garnett kansas
rhad
super stock
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super stock
Joined: Aug 2003
Posts: 954
garnett kansas
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i had a similar problem with a 518 trans,turns out there was a spring missing in the valve body,only way we found it was by comparing another valve body to the one with a problem,your results may differ!!
my ladder of success is missing some rungs
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Re: 518 shifts into 4th by itself?
[Re: James74]
#2636809
03/25/19 08:59 AM
03/25/19 08:59 AM
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Joined: Dec 2009
Posts: 20,647 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: 20,647
in a cattle trailer down by th...
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How/when does it shift into 4th? Does it shift 1/2 then 2/4 or does it shift to 2/3 and then immediately into 4th or is there a delay?
"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 conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 518 shifts into 4th by itself?
[Re: James74]
#2636858
03/25/19 09:53 AM
03/25/19 09:53 AM
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Joined: Jan 2003
Posts: 12,171 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,171
Benton, IL.
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I have put my share of Transgo kits in 904s and 727s without any real problems. But when I tried to install the Transgo kit in my 518, I had nothing but problems. None of them were the same as yours, but several that I was not able to resolve. I finally had A&A build me a valve body and all is good. If you can get an unmolested valve body somewhere, I would start with trying that and see what you have.
Master, again and still
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Re: 518 shifts into 4th by itself?
[Re: DaveRS23]
#2636860
03/25/19 09:56 AM
03/25/19 09:56 AM
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Joined: Dec 2009
Posts: 20,647 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: 20,647
in a cattle trailer down by th...
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I have put my share of Transgo kits in 904s and 727s without any real problems. But when I tried to install the Transgo kit in my 518, I had nothing but problems. None of them were the same as yours, but several that I was not able to resolve. I finally had A&A build me a valve body and all is good. If you can get an unmolested valve body somewhere, I would start with trying that and see what you have. I had nothing but problems with the TransGo kit in my 48RE. Ended up taking most all of it back out.
"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 conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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