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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 01-12-2008, 10:37 AM   #21
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in the long run it would be cheaper and mre relieably to swap the L36 with and L67
This is another misconception! If you have the knowledge and can do the work yourself, you can Top Swap most FWD 3800s for less than $700. Reliability-BLAH!!! No one here is pushing the limits of the L36 bottom, and most will never come close. The L36 can easily handle 400HP on a DD.

Now as far as the tranny, ANOTHER misconception! The only reliability difference between the HD and Non-HD is the diff, and there isn't much difference there either. about 1/2-3/4 of length and 3lbs. Don't do a burnout around corners and 99% of the time the non-HD is just as capable as the HD.

Yeah-I know I act like I've done 30+ of these! I'm just tired of everyone saying "its cheaper for the L67, or not reliable" and its paople that have NEVER done it!
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Old 01-12-2008, 12:15 PM   #22
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PCM programming is also different in the 9C1. Fans turn on sooner and stay on longer, timing is more aggressive, no speed limiter, etc.

As far as doing the top swap goes...I'd imagine it can be done, and it has been done. As stated, he already has the hd trans, AND the lower gearing to boot. Top swap it, along with the accessory drive from an L67, the harness, and reprogram the PCM so it can include the boost control. But, don't keep the stock boost. Lower it to about 6-8 psi, and have it come on later than normal, as your numerically higher gear ratio will more than make up for that (assuming you kept stock L67 tables, you may have a hard time keeping traction).

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