The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Suburban K20 1986 Silverado

Edahall · 05-15-2012, 10:22 AM

Around 1987 the THM 700-R4, now know as the 4l60, was introduced with an auxiliary valve Body. There is an easy way to find out if your 700R4 has an auxiliary valve body. As illustrated in this picture, look for the casting mark where the arrows are pointing to. If your 700R4 has this casting mark you have an auxiliary valve body 700-R4.

05-15-2012, 10:22 AM	#140
Edahall Registered User Join Date: May 2011 Location: Goliad, TX Posts: 672	Re: Suburban K20 1986 Silverado Around 1987 the THM 700-R4, now know as the 4l60, was introduced with an auxiliary valve Body. There is an easy way to find out if your 700R4 has an auxiliary valve body. As illustrated in this picture, look for the casting mark where the arrows are pointing to. If your 700R4 has this casting mark you have an auxiliary valve body 700-R4.