L94 & 6L80 Into My '92 2dr K1500 Blazer

[Nak]

I have all the running gear out. Woo Hoo! The L94 exhaust manifolds are being dropped off for ceramic coating today, as well as both driveshafts for high speed balances & new u-joints and front slip joint repair. The front driveshaft slip joint is frozen solid. I spent hours trying to get it out, then it dawned on me: Just pull the transfer case! Doh!

I ordered a new windshield washer tank & all hardware for a '98 Yukon; it's still available new from GM! The later trucks have it under the battery on the driver's side. My truck has it where my ECM is going to go... I also have the GM parts to move the battery over to the driver's side.

Next step is to drop the fuel tank, pressure wash the hell out of the underside, and POR15 coat the frame and anything else rusty under there. Doesn't look like it's too bad at all, just surface rust on the frame & the body looks clean.

BTW, in the pic of the L94 & 6L80 the wood blocks are just a safety precaution. It all balances fine on that engine stand. Very nice piece!

[Nak]

Now that the 700R4 is out I was able to take some good measurements. Both the 700R4 and the 6L80 are 26 7/8" long from forward mounting surface to the rear mounting surface of the 4WD adapter. As far as the mounting holes for the transmission mount, the distance from the center of those holes to the rear surface of the 4WD adapter is 2.5" on the 700R4 and 1.5" on the 6L80. So, the transmission crossmember will need to be moved 1" rearward. Pretty easy since it just bolts in place with 4 bolts. 4 new holes in the frame and all will be good. The driveshafts and TC shift linkage should line up perfectly. The shift shaft on the 6L80 is about an inch?? further rear than the 700R4. I think I'll be switching to cable linkage--I already have the IdidIt kit-- but I'm going to leave the rod linkage in place to see if it works. Even if it does, I'll probably need to switch to cable to make room for the exhaust.

Edited to add: OK, I measured the shifting shafts. From the front mating surface of the transmission to the center of the shifting shaft: 700R4 9"; 6L80 10.75"

[Nak]

Just been treating rust and cleaning. I'll be coating the underside with POR15 today or tomorrow, then the modifications can begin. First on that front will be stripping the existing harness down to what is necessary: AC, lights, ABS, etc. None of that connects to the ECM on my year, so it'll be a matter of identifying and eliminating all of the wiring for the old ECM. I'll be leaving pigtails on all of the wires going in to the firewall connector for the ECM; that;ll leave a convenient and factory method of running wires in & out of the cab. Also, I'll start on fabricating a mount for my electric fans. They're factory 9 blade fans & shroud out of a 2009 Escalade.

My plans on oil & trans cooling is separate coolers with fluid flow controlled by a thermostat. Any thoughts on that?