The 4Gens had a small engine stiffener that was on the side of the oil pan (the 4Gens also used a stamped steel pan). Along with the stiffener, the 4Gen used a stamped flywheel cover that provided no support at all. The 5Gen uses a cast engine stiffener that serves as the stiffener and the flywheel cover. Much more beefy. It will not work with a 4Gen pan (or the Mororo 4Gen pan replacement) as the stiffener bolts to the pan itself. You'll have to use a 5Gen cast pan to use the 5Gen engine stiffener. It's a much better design, IMO.
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Originally Posted by ThatPreludeGuy
What about the "trans stiffner" I've read about in other threads, the 4th gens didnt have one and the 5th gens did? I remember there also being talk about the diffferences in pans when Moroso had first made their aftermarket one for our cars.
Sorry to be a PITA with questions but outside of seeing them both side by side I cant imagine whats different.
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