Posted by jdemaris on August 17, 2010 at 07:37:45 from (67.142.130.45):
Anybody out there have a Chevy or GMC factory service manual for 1991 pickups?
I'm trying to figure out what I have to do, to use a 1991 700R4 trans in my 1986 K5 diesel Blazer mini-motorhome that also has a 700R4.
My 86 already has the 700R4 (but it's blown). TV control and valve-body controled converter lock-up. I know that the 700R4 got many improvements in 1987, and many more as years followed.
I have a 1991 diesel Suburban with a 700R4 - NOT a 4L60 or 4L60E. But . . . the 1991 trans appears to be partially computer controlled - so I'm a bit confused at this point. If not too difficult, I'd like to rebuild this 1991 trans and use it in my 86. If I had a wire diagram, I'd know more about what this entails. From what I've read, 1989 and newer 700R4s use computer-controlled converter lockup - even though they are called "non electric" transmissions. This 1991 diesel Suburban has a few added engine-controls/sensors that my 86 diesel does not have. The 1991 has a throttle-position sensor on the fuel injection pump and also have an RPM sensor on top of the engine-driven vacuum pump. The 86 has none of these things. I've got no problem swapping the parts in, IF I knew how to tie in the computer. I'm assuming the RPM sensor and the throttle-posistion sensor are there for transmission control.
My other option is to use a different trans. I also have a 1988 diesel Blazer up in my field with a 700R4 that is set up like my 86. I'm just inclined to use the 1991 trans since it's likely to have more improvements in it.
Main thing is, I need to see a schematic for 1991. I have diagrams for 82, 83, 84, 86, and 88. Nothing newer.
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