This will fit my 83 Scamp GT, right? Thanks.
The quick answer to your question is 'yes', the A520 and A555 will bolt up directly
to just about any 2.2 or 2.5 in any Dodge/Chrysler/Plymouth. There are a few 'notes' though with regard to your starter, shifter, axles, and torque strut.
The early and late starters bolt to the transmission differently but the starters are pretty much interchangeable with the right bolts and holes. Early starters bolt to the bell housing at the rear bolt closest to the engine with a bolt and separate nut, it's a PITA to get the nut on and off. Later starters have that bolt replaced with a stud in the starter with the nut on the bell housing side or using a bolt with the threads being in the starter flange. Worse case you have/want to drill out the bell housing hole so you can insert the bolt if needed. Everything else is the same. If it is a turbo application, a heat shield is really needed to protect the starter solenoid and keep it from getting cooked and melting your starter cables.
Torque Strut Vs Dog Bone:
The A520 and A555 use a torque strut that looks like a small shock absorber rather than the dog-bone as in all the L-body cars, including Rampage and Scamp. The bracket on the subframe for the dog-bone is not in the same place as it is in a torque strut car. One ear of the bracket can be used and a common solution is to just use a long grade 8 or 10 bolt with spacers and a few washers and a lock nut. The other solution is to have an additional ear welded to the subframe to accept the standard torque tube mounting points and standard bolt/nut combination. Moving the existing bracket is easier said than done.
The earlier 4 speed and later 5 speed A525 transmission uses a small spline axle shaft. The L-body axle shaft is shorter than all others, it is unique in it's length. The A520 and A555 use a larger spline shaft like the 88+ automatic that came in the Omni/Horizon. So if you put an A520 or A555 in an L-body you have to get the 88+ automatic axle set. One long and one short, you eliminate the equal length setup if you have one. You can get these 88+ automatic transmission axles for the Omni/Horizon at almost any auto parts store, they will have to order them probably. Rockauto has new ones for about $60 each, no core.
Shifter-Rod shift Vs Cable shift:
The A520 and A555 transmissions are cable shifted transmissions. All l-body 5 speed cars are rod shifted transmissions. If you put an A520 or A555 in an L-body you have to either get a shifter from a 87-89 5 speed car (non L-body) and a set of cables preferably from a Shadow/Horizon/CSX and then make it fit in the L-body, it's not a good fit as far as the console fit and mounting points on the floor....OR...get a A525/A520/A555 conversion bracket set that allows you to keep all your factory L-body rod shift levers and parts. There is a heavy duty A525/A520/A555 conversion bracket available from turbododgeparts.com and also one from OmniPotent Parts.CLICK HERE-A525 Conversion Brackets