Re: T400 easy swap

Posted by jdemaris on November 01, 2006 at 05:54:47 from (69.67.229.173):

In Reply to: OT: 1986 Chevy Truck transmission swap posted by Brad in WI on November 01, 2006 at 02:34:57:

T400 is a pretty easy swap and is the most rugged auto. trans. GM had at the time.
I have two 83 diesel Blazers that I converted year's ago - from the 700R4 to the T400s (3.08 axles). I have a mechanical governor in one (no modulator), the other's all use a vacuum simulator valve (VRV) to mimic throttle/vacuum reponse like a gas engine has. So, changeover in a gas engine truck is easier than my swaps. You can buy adapters to go between the transfer case and trans - but finding a donor vehicle is easier. I have one if you need it - but I'm in New York. I've got a low-miles 4WD 89 Suburban with an excellent T400 trans, torque converter and 241C transfercase. I recently let my son take the engine from it, and I'm going to take half the frame for a K5 Blazer motorhome project.
My 86 diesel Blazer was recently changed over -same deal (3.08 axles)
In the case of my 87 3/4 ton 4WD Chevy Suburban and 89 GMC Suburban (both diesels) - the dealer would not sell them with the 700R4 - since they were both bought as tow vehicles -they both came with T400s and 3.73 axles.
The lack of overdrive should not be an issue - unless you've got axles over 3.73. My 87 Suburban made it to the 500,000 mile mark with orignal engine and T-400 trans - with a lot of towing and 75 MPH highway speeds. The 14 bolt SF rear-axle went twice - but that's a different story. Also, since all of mine are diesels - the RPM range is more limited than your gas engine. A 6.2 diesel has an optimal high RPM range of 1800 - 2200 RPM. Your 350 gasser will handle the higher RPMs better - so if I had no problems - you shouldn't either.

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