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**Bob B.** · 01-22-2022, 12:03 AM

I think the TH400 was a mid-year option on both the '66 Chevy and GMC. I have seen '66 GMC pickups with the V-6 and TH400, but the TH400 option is not in the brochure. Only the AT-218 Pow-R-Flo (Powerglide).

01-22-2022, 12:03 AM	#23
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: TH350 vs. TH400 I think the TH400 was a mid-year option on both the '66 Chevy and GMC. I have seen '66 GMC pickups with the V-6 and TH400, but the TH400 option is not in the brochure. Only the AT-218 Pow-R-Flo (Powerglide). __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.