200r4 to t400

[bns454]

i know its a backward conversion to you up overs but i have a fresh built t400 and a slipping 2nd gear t200r in my ck3500 so im keen to swap them around will it be a straight forward swap or am i headed for heartake its more a fact that the t200r is like rocking horse poop here but a t400 is common and i have a good t400 ready to go the truck is a 86 454 crewcab dually

[bammax]

How'd you end up with a 2004r in a 454 dually anyhow? That was definitely not done at the factory. That thing would have to be built up huge to handle that truck.

You'll need a crossmember, driveshaft, cooler lines, linkage adjustment, and the new trans needs to have the right speedo gear combination for your truck.

[bns454]

thanks for the info. i jumped under today and pulled the box it definatly wasent installed from factory but its how the truck came into australia it looks like it was orignley a t400 truck anyway i slotted the crossmember in prep for the new box tomorow but still have to find a tailshaft yoke

[INSIDIOUS '86]

200r4s where built for old lady's cars so they shift soft and wear quickly. All the same things that are done to a 700r4 or a th350 or th400 can be done to a 2004r. All can handle in excess of 800ftlbs torque from a big block

The 200r4 is the same size as a standard 6 in tail th350 or th400. So you should just be able to move the crossmember to the proper location and put it together. Is your th400 a slip yoke rear driveshaft?
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[bns454]

thanks for the assistance i got the new trans in and driving today i managed to raid a tailshaft yoke from a wb statesman (like a 1980 caprice) slip type. i noticed the engine seems to tilt back a fair way putting load on the bellhousing bolts (there were 2 broken) is this normal? and the 400 i put in seems to have a bit higher 1st gear than the t200 although the 400 has a 3000 converter on it so it my be that im just not used to it

[INSIDIOUS '86]

Yah that's the dynaflow effect
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