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178-1036 is listed for 2011. From TXLLY above, it worked great on a 2004.5, so it should also work for 2008. Some have had to make minor adjustments with the rod eyelet to the brake switch work correctly.
 

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I've read enough to know I'm definitely not going reman. I've read so many threads and parts sites looking for parts for the HB, HB lines, PS lines, front end parts, etc., I feel like I'm going to puke. I'm sure plenty of others can relate. I just ordered the 178-1037 from Rock Auto.
 

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I happen to have a 178-1036 new in the box that I will let go for $150 + shipping. If interested PM me.
 

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What's the difference between the 1036 and 1037 part numbers...? Anyone know?

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I happen to have a 178-1036 new in the box that I will let go for $150 + shipping. If interested PM me.
Do you know what the difference is between the two part numbers? I may be interested in the one you have for sale.

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Do you know what the difference is between the two part numbers? I may be interested in the one you have for sale.

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I do not actually, Im only guessing that one is AC Delco and the other is the GM part number. This one came from a GM Dealership online.
 

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in case someone here is interested, I have 2 in my shop, unopened, GM #20940394; ACDelco #178-0853
I purchased 4, installed 2, and have the two left.
 

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AC Delco Hydro Boost Info. Gathered this when I ordered a new one for my LMM.

178-1036-LML (Newer One)
178-0853-LML
178-1037-LMM
178-0854-LMM
22872387-Gasket
2771004-Rebuild Kit

LML Mod: Enlarge the push rod hole for the brake pedal post to 17mm (about 43/64), so the brake switch seats and works correctly.

178-1036 on the right compared to the OE out of my 2008 LMM.

 

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in case someone here is interested, I have 2 in my shop, unopened, GM #20940394; ACDelco #178-0853
I purchased 4, installed 2, and have the two left.
Price?

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