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Local junkyard. Came from an 1985 Suburban. Got it rebuilt locally as well.

UPDATE: It’s been almost 2 years since the swap. Odometer is at 71,000 original miles. I have given this 700r4 hell. From extreme high elevation mountain off-roading to low Moab desert terrain and towing several times. 700r4 Temps have peaked from 180-240 degrees several times while long hill...

Yes! I posted stats on my build thread. Here’s a copy. Keep in mind, it is a 6.5 optimizer turbo rolling 37” tires, 4.56 gears and a 5 1/2” lift. I was not driving conservatively. Here are the stats from this weekends 760 mile round trip. 50mph @ 1500rpm 55mph @1700 rpm 60mph @1800 rpm...

Since I was not able to find an Oem TV cable, I experimented with a TV cable that was a few inches longer and it worked out great with the adjustment. See part Y-225. Sold on Amazon for only $15. See pics.

If you need that support rod, I have access to two of them. Send pm if you are interested.

The older np208 transfer case’s are designed to have part #12, which is the trans/t-case support rod. It prevents the transmission case and bell housing from cracking. They are not made anymore and are quite rare to find. If your np208 has those 2 bolt holes for the support rod, then I recommend...

Step 14 Fill up transmission and transfer case with full synthetic ATF and enjoy that extra 4th gear, better mpg and low crawling 1st gear! All done! Thanks for looking and I hope everyone has a Merry Christmas!

Step 13 (Optional) Delete all vacuum lines and remove vacuum pump. If you are on a budget, you can modify your old vacuum pump gear drive by removing the top vacuum pump, installing a pressed cap on top and a plate on the side as seen in pics 1-3 Or you can buy a 6.5 oil pump gear drive...

Step 11 Plug in the transfer case 4x4 indicator plug on the top of the np208. This is the only electrical connection needed for a pre 1986 700r4 swap. Pic 1 Step 12 If you have a warranty on your 700r4, I recommend having the transmission shop install the tv cable bracket, tv cable rod, tv...

Update. Got hit with COVID and phenomena. Will finish this when feeling better.

Step 10 Install front and rear driveshafts. Pic 1-2 As you can see in pics 3-4 you will not need to shorten or lengthen the driveshafts. The driveshaft angles are exactly the same as it was with the Th400/np208

Step 8 Reconnect the transfer case linkage. Pic 1 Step 9 Reconnect the Transmission Linkage. Do not forget to install the spring and plastic washer. Pic 2-4 Connected Pic 5-6 Both step 8 and 9 does not require any adjustments of the shifting linkage. Steering column does not need to be...

Step 7 Put a generous bead of Optimum Black on the adapter. If you prefer to use the gasket, that is an option as well. Pic 1 Lift up the freshly rebuilt Transfer case and put it part way on the shaft. Let it hang. Clean the 6x9/16” bolt threads and put on thread lock. Clock the Transfer case...

Step #6 Install the Th400 Crossmember. The Th400 Crossmember with the Long 700r4 Adapter is a direct bolt on! No drilling into the frame is required! Because it is a direct bolt on, you will also NOT NEED to shorten or lengthen the driveshafts! Why? The Th400’s length from bell housing to...

Step #5 Install the 700r4 transfer case adapter (Gm 14038663). First clean up the adapter and transmission rear housing area with a Scott’s pad and paper towel. Pics 1-4 Put some ATF on the adapter O-Ring by simply pouring a small amount on a paper towel and rotate the O-Ring on the fluid...

Step #4 Bolt up the torque converter to the flexplate. Torque is 50 foot pounds. Install the 6 bolts with lock tight. Install bolts loose. Do not fully tighten until all 6 bolts are on to keep bolt holes aligned. Pic 1. Use 15mm short socket wrench to fully tighten the 1 bolt in between the...

Step #3 Install the 700r4 using a transmission Jack or a modified Jack like mine. Pic 1-2. It helps to have a buddy lift the trans on the Jack. Having a bottle Jack under the motor to make height adjustments helps as well. Pic 3. Use 14mm socket wrench and a plethora of extensions to bolt up...

Step #2 Install the TV cable into the 700r4. Carefully insert the rod threw the Tv cable bracket, gently give tension on the motor side of the Tv cable and suck in the rod into the Tv cable housing and carefully install the housing into the 700r4 and bolt it up. The Tv cable bolt size is M6x20...

With the th400 and np208 out… Step #1 Remove the Th400 flexplate using a 11/16 socket and wrench. Use a long extension bar to keep flex plate in place. Install the 700r4 6x10.75 bolt pattern (Gm 1407715) flex plate. Make sure the notched side of the teeth and weight on the flex plate faces...

Parts list continued… 11. 6.5 diesel oil pump gear drive with tachometer sensor on top (Gm 7849305) Pic 11 12. Transfer case to Transmission support brace. Pic 12 13. Oil pump gear drive gasket (Gm 14022649) Pic 13 14. 700r4 Transfercase adapter gasket and O-Ring Pic 14 15. About 15 quarts...