is it gonna fit?

[Shannen Durphey]

The 88 truck would have a THM400 or 4L60.  You would need to score a newer model
truck for the 4L80E.

4L60 transmissions after 86 are generally stronger, but definitely try to get some
idea as to the condition of the fluid and miles on the trans before buying.  Truck
transmissions tend to get worked harder.  But you know that.  The ecm would be our
friend and brother, the 7747.  But the 7747 really likes to be a tbi ecm.  TPI is
better run with a tpi ecm, and since you're not worried about controlling a 4L80E,
you can use the 727/730 sd tpi ecm. 

Fwiw, ymmv, hth.

cya.

I mean, see ya.
Shannen

Jake Kooser wrote:
> 
> Somebody here in South Florida was kind enough to roll their 88 3/4 ton 4X4
> PU and now is parting it out.  I've got an '85 suburban 3/4 ton 4X4 and I
> want to swap my TH400 trans for a 4L80E if I can.  Does anybody here know if
> that truck would have that trans, or would it be the 700R4 still?  If it's
> the 700R4, isn't this after the "fixes" to the early model 700R4 problems?
> Should I get the transfer case too?  What else would I need to score to
> control the transmission (assuming 4L80), ECM guys?  And finally, what ECM
> would be in this truck, and could it be taught to control a Tuned Port
> engine?
> 
> Sorry for the geyser 'O' stupid questions, but just the possibility is like
> winning the lottery here.  Big Sub like gasoline just a little too much...
> Especially after coming from an air-cooled VW.
> 
> Jake Kooser
>
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