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Old 10-19-2018, 06:30 AM   #1
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Join Date: Aug 2018
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Default A518/727 parts interchangeability.

Im looking into possibly building an a518 for our 400 horsepower mopar small block scout ii. I figure i probably want stronger parts for it and i keep hearing that an a518 is just a 727 with an overdrive unit so i was wondering what parts actually interchange so i could use parts from a big block 727 i have laying around. I know the cases are different and i dont think the valve bodies would interchange but what about the planetaries and clutch drums?
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Old 10-19-2018, 07:15 AM   #2
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Default Re: A518/727 parts interchangeability.

I don't have a definitive answer for you, but the planetaries must be compatible with the output shaft that they ride on. Not all 727 planetaries fit all output shaft variations universally, and that's within the same transmission model. You could probably visit WIT...Whatever It Takes dot com and do your own part number comparisons between the two models to see what, if anything crosses.
Coal Trickle - '99 Dodge Ram SLT 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500/8800# GVW/12K# winch
Hooty - '74 SII 4x4 - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/33g Fuel
Lemuel - '73 1210 Reg Cab 4x4 CS - 304/TF727/NP205/4.09 FA25 & 4.10 RA16/6800# GVW - "Pull Lemuel, pull!"
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