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7th Gen Drivetrain Transmissions, clutches, and axles.

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Old 08-10-2012, 05:20 PM   #1 (permalink)
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3400 torque converter behind an L36?

The rebuilt trans has to come back out of my L36 Impala due to a defective pressure control solenoid. ( "New" doen't necessarily mean "good" any more. ) It's kind of a blessing in disguise though because I have made a few mild mods to the car and have a few more planned. Nothing radical, just a few things to squeeze a bit more out of it and make it a little more fun to drive. So far I've done a Magnaflow 2.5" downpipe with hi flow cat and U-bend delete, DynoMax cat back, K & N intake and Hypertech programmer ( until I'm ready for a "real" tune ). It runs better than it did from 1800 up to 4000 and then it REALLY takes off from 4000 to redline compared to what it was when I started but while I don't "think" I hurt it below 1800 it sure didn't gain anything. Later on I plan to do the ZZP staggered ratio rockers and HV3 plenum insert, "maybe" a front Powerlog, maybe.

While the trans is back out I'm having a TransGo shift improver kit installed and replacing my 35/35 sprockets with 33/37's to change my 3.05 FDR to a 3.42. The lower gears will help but I'd also like to raise my stall speed a little without breaking the bank. Anybody played with replacing the 3800 converter with one for a 3100/3400 to gain a little stall? I won't be racing the car at the strip, no drag radials or anything like that I just want it to be a touch quicker off the line than it is now. Good thing this is just my work car LOL. I may end up buying a different work car and making this one my toy............

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Old 08-13-2012, 07:08 PM   #2 (permalink)
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ER rockers and the HV3 will really wake it up, along with a real tune or OTS pcm


As far as the trans, why are you going 3.42? Why not just do 3.29 or 3.69? There are conversion kits for it already that have proven reliable


ZZPerformance - 245mm Torque Converter #ZZ-GPTQC
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Old 08-14-2012, 04:19 PM   #3 (permalink)
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Quote:
Originally Posted by 00impala123 View Post
ER rockers and the HV3 will really wake it up, along with a real tune or OTS pcm


As far as the trans, why are you going 3.42? Why not just do 3.29 or 3.69? There are conversion kits for it already that have proven reliable


ZZPerformance - 245mm Torque Converter #ZZ-GPTQC
3.42 is an excellent all around gear in a mid 3,000 Lb. daily driver with OD. My car currently has 3.05's, a simple sprocket change while it's apart and I have 3.42's without touching anything else and a good set of used sprockets was $60 with shipping. A 3.29/3.69 would require a differential and gear change and I guarantee that would cost me more than $60.

Yeah, I looked at the ZZP convertors but I'm a cheap old SOB, I was looking for something factory like a converter from a 3100 Lumina or something that would give me a little more stall for a couple hundred bucks. I've decided to forego the converter for now and stick with what I have, it only has 3,000 miles on it and it "works" but thanks for the input.

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Old 08-14-2012, 06:59 PM   #4 (permalink)
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Yeah, sorry idk if the 3400 or 3100 works for that lol.

You'll still have to change the pcm for the correct gear ratio, just a heads up. Sounds like a fun project though, I still want to do a gear swap
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Old 08-14-2012, 07:34 PM   #5 (permalink)
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Originally Posted by 00impala123 View Post
Yeah, sorry idk if the 3400 or 3100 works for that lol.

You'll still have to change the pcm for the correct gear ratio, just a heads up. Sounds like a fun project though, I still want to do a gear swap

Got it covered. My Hypertech programmer has that function plus I have a friend who's been GM dealership mechanic going on 25 years that has access to the equipment to flash the PCM. He did my new BCM for me.

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Old 08-14-2012, 08:33 PM   #6 (permalink)
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Nice, just wanted to make sure you were aware of that lol

LMK how it turns out..I'm basically just waiting for my trans to take a crap and need a rebuild before I open it up (its pretty close lol)
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