That I couldn't tell you. But I'm pretty sure that in '88 the only transmissions offered in the trucks were the AOD's and the C6's. I could be wrong, but I've just never seen one in an '88I got a 88 truck it has a c4 are all c4 73 on up the same
'89 was first year of the E4ODJust look at the pan.
The C4 has a small squared off pan with roughly 12-14 bolts, while the C6 has a large pan with more than 4 straight sides and closer to 20 bolts.
Also, the C6 has a non-removeable bellhousing, while the C4 tranny is seperate from the bell (it unbolts).
If you have an 88 with a C4, it was not stock. I am not even sure a C6 was available in 88. Once the AOD came out, the C4 was gone pretty quick, then when the E40D came out, the C6 went away. I am pretty sure the E40D was out by 88.
Every C4 I have ever had looked like what that chart calls a "C5".
You could be correct! C4's and C5's were a "little" before my time. You're probably old enough to be my dad. Not saying you're OLD, it's just that I'm that youngYeah, I noticed the rest were correct.
If memory serves, it's been a very long time since I have seen a chart like this (they used to hang on the wall at mom and pop parts stores), the first pan is actually a C3, and the second a C4/C5. I could be wrong though. Getting old sux.
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