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42RH into my 87

mopar_nocar

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Jun 13, 2026
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Dug a 42RH out of a 92 Dakota today. Gonna put a 5.2 Magnum and this thing in my 87 D150. Currently running 3.55s in an 8 1/4 for rear end with 30" tires. Thinking about throwing more gear in it, but will decide after I get this thing running and see how I like it.

PLAN is to get this going and then rebuild the front end in a few months. THEN get someone to body work it an paint it up.

As it sits right now...well actually I threw the 42RH in the bed after these pics.

PS.jpg


closed_bed.jpg


DS.jpg


open_bed.jpg


ds interior.jpg


Front.jpg


ps interior.jpg


engine bay.jpg
 
Little set-back today...JY Magnum motor has no compression on cylinder #4...blows out the exhaust port during the test. I am assuming bad exhaust valve at this point. More digging tomorrow, but I don't see how this motor isn't going back to the JY.

sb
 
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