LSA coming together

[CrashTestDummy]

Heh, indeed. Did you do any transmission updates before the LSA mods, or did you start up front first? It will be interesting to know what the postmortem is.

[JustDreamin]

Well that's a major downer!

Have you considered going to the 6L90E (variant that is behind the LSA, also used in truck applications)? I think the hidden jem is probably the Express vans. 3/4 and 1 ton with pretty much any engine (4.8 through 6.6 Duramax) should have the 90E. The 90E has some better parts inside (input gearset has 6 pinions vs 4, output gearset uses wider gears, may have additional clutch plates as well). Trans is a little longer overall (35mm) and reportedly a bit bigger overall (1/8" to 1/4" or so). Overall length might require driveshaft shortening. It's also a bit heavier.

Not a sermon, just wanted to make sure you knew there were some other choices available. I'm guessing you do, but....

JustDreamin

[orgdnr]

Just the Camaro pan and SS 3.45 diff. Have my feelers out for a 90 but $1500 seems to be the # on them from the boneyards. When I get the 80 apart I'll see how bad it is and go from there. In the mean time I'm rolling a 30 model A pick up for a DD.

[JustDreamin]

According to Car-Part.com there is a Canadian salvage yard with a ZL1 spec trans for $1300. But then you'd have to ship it. And I'm not sure they could ship easily to the states.

Dom's Auto Parts - 1-905-434-4566 /1-800-481-7272.

The CTS-V / ZL1 spec transmssions have a slightly higher rating. Not sure exactly what changes (I saw some discussion of a "Lite" version of the 90E with one less clutch plate for certain applications, probably 4.8 V8 trucks and vans, I'd think that should be avoided for your application).

Daily'ing a 30 Model A. Sounds like good fun, especially with a 383 in it. And something you can't (or maybe shouldn't) do in every part of the country at this time of year.

JustDreamin

[eagle-co94]

Wow, thanks for posting this info. I'm pulling my LSA and tranny together and planned to drop it in the Caprice immediately. I'll have to do some measurements once I drop it in to see where I stand on driveshaft length. I wonder what the V and Camaro DS lengths are in comparison.

[eagle-co94]

Any updates on how your build is going?

[orgdnr]

It's done! I had a few issues with the transmission. I had installed the sk boost valve with the over pressure relief and when I commanded high shift pressures, it mechanically dumped under pressurizing the 456 clutch and welding them together. got rid of that with no other changes and it's fine. I had a friend down under work on the tune and she shifts like a Cadillac part throttle and a Lenco wide open even with the torque management active. My harness came in from Australia yesterday for the tr6060 so all that is left is BCM programming and a clutch that will hold against the LSA. If I have time today I'm going to make an LS7 MAF intake tube and get some dyno #'s vs the stock unit.

[orgdnr]

Wow, thanks for posting this info. I'm pulling my LSA and tranny together and planned to drop it in the Caprice immediately. I'll have to do some measurements once I drop it in to see where I stand on driveshaft length. I wonder what the V and Camaro DS lengths are in comparison.

The 2010 SS Camaro shaft is 24 1/2 in long PN 92246788 and is about 2 in shorter than the Caprice. with the 6L90 being 35mm longer than the 80, you should be in the ball park as the spline engagement is 2 1/8in.

[eagle-co94]

Is that an older part number? I just checked GM Parts Direct and they show 92249105 for a manual and 92237002 for an automatic. Where did you get the length numbers? If you found them somewhere do you know what a 2011 CTS-V Coupe automatic DS length is? That's what my parts car is.

[orgdnr]

PN and measurement off of my drivrshaft. I don know about the cts-v lengths.