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post #1 of 27 (permalink) Old 01-28-2012, 08:16 PM Thread Starter
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Transmission Options

Ok, still up in the air about the trans I wanna throw behind the new engine.

Options are, 4L60E, 4L80E, TH400, or TH400/GV combo

Option 1: 4L60E costs $2925 with a 2 year warranty, and would require just a reflash of current converter. Downside is, google fast cars with 4L60Es and, you do not see many, if any at all. They are not meant to be raced and this is a factor in my choice. Upside is, it would obviously bolt right up and require no mods.

Option 2: 4L80E costs $2200 for a 1 year warranty, and would require a trans crossmember at $170 and a new converter at $845. OR, a full "kit" which covers all the stuff I need to swap it in for $3500 and also gives a 2 year warranty. The trans can handle more than I plan on throwing at it, and comes standard with a T brake, BUT, will require cutting/BFH mod to the trans tunnel.

Option 3: TH400 costs $2500 with no warranty(local used unit) but would come with everything I need to bolt in and go. Converter would need to be restalled. Upside it would also handle anything I throw at it but, I lose OD and lock up.

Option 4: TH400 with GV unit, not really a practical option as it would cost well over 5k to and I could easily just do a 4L80E for less.


So, at this point I am wondering how much value I place in lock up and OD in the trans. Granted cars came with 3 speed transmissions well before this so it can be done, just curious how people would feel in this situation given the options.

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I have a heavily modified lt1.


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post #2 of 27 (permalink) Old 01-28-2012, 08:49 PM
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Racer? 400

DD? 80E

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post #3 of 27 (permalink) Old 01-28-2012, 09:16 PM
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There is the 700r4 and 200r4 also.

If its a weekend/track car and you won't see much highway use I'd go TH350/400.

Just two slow 4 doors.
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post #4 of 27 (permalink) Old 01-28-2012, 09:18 PM Thread Starter
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OD is less of an issue as the rear gear set will be low, round 3.08 area pending stuff. So with a TH400, the cruise RPM at 75 is roughly 2800rpm which is less than it was with the old 4L60E with OD.

More concerned with around town red light to red light RPM.

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post #5 of 27 (permalink) Old 01-28-2012, 09:28 PM
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TH400 or 4l80e. If you are going to drive it on the street a decent amount the electronic controlled one would be my choice, the OD is just a bonus.

How would you control the 4l80e?



Yep its slow.

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post #6 of 27 (permalink) Old 01-28-2012, 09:28 PM Thread Starter
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With an LS1 PCM of course.

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post #7 of 27 (permalink) Old 01-28-2012, 09:54 PM
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Sell you my 4L60E with a 2 day warranty, $200
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post #8 of 27 (permalink) Old 01-28-2012, 09:55 PM Thread Starter
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I have a 4L60E, sorry

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post #9 of 27 (permalink) Old 01-29-2012, 05:43 AM
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Yeah, I joking mostly. Good luck with the build though.
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post #10 of 27 (permalink) Old 01-29-2012, 06:12 AM
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Non-lockup converters are fun!
For what its worth, I had a th350 in my 70. IIRC, 65 was 3200 rpm in my set up. The trans was a few years old when I bought the car. I had the car back when I'd go racing pretty often so I drove the piss out of it for 12 years with a small converter. It never failed or caused me any problems.

Just two slow 4 doors.
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post #11 of 27 (permalink) Old 01-29-2012, 06:58 AM
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Two speed power-glide.

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post #12 of 27 (permalink) Old 01-29-2012, 11:49 AM Thread Starter
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Would completely ruin the car for me

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I have a heavily modified lt1.


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post #13 of 27 (permalink) Old 01-29-2012, 05:32 PM
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Quote:
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Two speed power-glide.

HAHA, my first car was a '69 chevelle with a 2 speed powerglide. loved it.
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post #14 of 27 (permalink) Old 01-29-2012, 09:14 PM
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4l80-e
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post #15 of 27 (permalink) Old 01-30-2012, 10:06 AM
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Quote:
Originally Posted by ShowNoMercy View Post
OD is less of an issue as the rear gear set will be low, round 3.08 area pending stuff. So with a TH400, the cruise RPM at 75 is roughly 2800rpm which is less than it was with the old 4L60E with OD.

More concerned with around town red light to red light RPM.
What do you mean? Its the same trans just one has od. It will be the same until you switch into 4th on the 80. Also, you can run a non-lockup converter in the 400 and not worry about clutch shudder with your motor. At this point its whether or not you want a computer to change gears for you, everything else is moot.


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Last edited by ShowNoMercy; 01-30-2012 at 11:19 AM.
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