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Greenlee · 01-26-2010, 07:40 PM

Thanks for the replies. What is a parking pawl?

I did a search and found this from an article in Peterson 4 Wheel and Offroad:

"Two cases were available. 4x4 models have the "HD" case (stamped on the housing) with a cast-aluminum flywheel cover. Car applications got the "K"-stamped case and a plastic or sheet-steel cover. If you're sourcing a junkyard core, make sure it's an (uncracked) HD model."

The article seems to imply that any Turbo 400 that came in a 4x4 truck says HD. I don't think the one I have from the 4x4 Suburban says HD. However, I don't know for sure that it's the original transmission. Also, the article said that in 1987 the nomenclature was changed and the burb is a 1990.

01-26-2010, 07:40 PM	#4
Greenlee Registered User Join Date: Jun 2004 Location: El Lago, TX Posts: 1,668	Re: HD Turbo 400 Thanks for the replies. What is a parking pawl? I did a search and found this from an article in Peterson 4 Wheel and Offroad: "Two cases were available. 4x4 models have the "HD" case (stamped on the housing) with a cast-aluminum flywheel cover. Car applications got the "K"-stamped case and a plastic or sheet-steel cover. If you're sourcing a junkyard core, make sure it's an (uncracked) HD model." The article seems to imply that any Turbo 400 that came in a 4x4 truck says HD. I don't think the one I have from the 4x4 Suburban says HD. However, I don't know for sure that it's the original transmission. Also, the article said that in 1987 the nomenclature was changed and the burb is a 1990.