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Gal, I didn’t hook up an rpm signal input. It is not a required for the US Shift installation. You don’t get the learning capability of the controller. I planned to go back and figure out a signal (my 6.5l has an oil pump sensor) but 18 months later and it drives just fine, so never got around...

This was an '88 that had a GEP 6.5L & the new parking brake done by the Government at some point. I am not sure which fuel tank I have, I can't tell by looking at it underneath which style it is. I am also unsure which wire harness I have, but the engine harness was P/N 12339350 (I had a bad...

My Actual issues: TPS: What a huge pain in the ass! The back bolt that held the fan cut out switch in place was so ****ed hard to do. Just had to keep at it, re-install was a joyous PITA too! I ended up super gluing the washer to the head to allow hand turning the bolt...

Transmission & Transfer Removal: · Disconnect Battery, Install tire blocks · Remove transmission ATF (I used vacuum syphon), kept oil in X-Fer · Remove Rear Drive shaft (4- 15mm heads rear, 5/16 head front) · Remove exhaust cross pipe (9 bolts- 9/16 heads, both...

4L80e Upgrade Here is my 4L80e experience Started with a 1988 24,000-mile M998 that had been updated with the 6.5L NA, still had the TH400 and NP218. The TH400 became a 4L80 and the NP218 was replaced NP241c, to allow the 2wd operation. Time will tell how the 2wd works, but lots of modern HD...