Making a 518 lockup

How they work, how they don't work, and how to fix them

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Re: Making a 518 lockup

Postby cougar » Fri Jul 22, 2016 10:28 am

I very much want to do the lockup conversion in my 92, but not having any success. Mainly because of cost. The problem is no parts pool here in Alaska and they don't sell parts of, just the whole transmissions. I don't have enough information on compatible transmissions to know what to scavenge from. Apparently there are differences within models that will make one compatible and another not. Such as shaft diameters and valve body bolt hole patterns. The outrageous shipping charges doubles the price of things sent up here. So I have to work with what I can find and not what I want to use. I have a good 518 to start from, so can anyone help me narrow down any possible combinations?
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust.
01 2500 "the work truck".
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Re: Making a 518 lockup

Postby txs » Mon Jul 25, 2016 9:37 am

if you have done any mods to your motor at all I would highly recommend an alloy input shaft, I have seen 2 shattered lockup input shafts on totally stock cummins trucks. If you don't have the funds for that, find a gasser lockup 518 and use the parts off of that. The valve body itself was the same wether it was diesel or gas, all you need to do is take the little covers off the sides of the vb and put the diesel springs in, if they are a different color. All the internal springs in the vb are color coded if there was a difference. Never mix and match the steel separator plate, or the transfer plate, keep those together with the valve body. The input and reaction shaft support out of the lockup gasser will fix you right up.
93 w250 6 speed 4" exhaust, caution, work truck, she's no beauty. building 1 ton dually 4x4, dana 80, 48rh, 205 Scratch the one ton, bought frt. dually 4x4 98 12 valve with the tiny rear doors. rides so much better than the 93.
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Re: Making a 518 lockup

Postby cougar » Tue Jul 26, 2016 8:54 am

The only part out of a gasser 518 I can use is the valve body. The input shaft is a smaller diameter. At this point I'm planning to use a 47RE diesel or V10 front section (can be 2 or 4wd), my A518 OD unit and piston retainer, and a 46 or 47RH valve body.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust.
01 2500 "the work truck".
cougar
14mm rotor
 
Posts: 922
Joined: Sat Apr 18, 2009 3:31 pm
Location: The Valley of no concern, AK
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Re: Making a 518 lockup

Postby dazedandconfused » Tue Jul 26, 2016 9:29 am

The gas 518 shafts are the same as a diesel.
1983 Dodge D150 that has been repowered with a 93 Cummins/518 running gear AKA The Ugly Duck! I would much rather build them then buy them.[
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Re: Making a 518 lockup

Postby cougar » Sat Aug 06, 2016 11:13 am

Found a 47RH from a diesel and going with that.
RIP 91.5 W250 5 speed. The great experiment.
92 W250 HD 47RH with Compushift. Upgraded H1C to 60/60/16, Scheid Lightning VE, 60# valve springs, DAP 7X.010 injectors, 4" DE exhaust.
01 2500 "the work truck".
cougar
14mm rotor
 
Posts: 922
Joined: Sat Apr 18, 2009 3:31 pm
Location: The Valley of no concern, AK
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