i have a 1985 monte carlo ss that currently has a 2004r. i want to swap to a TH400 short tail shaft, can you please tell me what is involved or needs to be modified other than the shifter and speedo.
2004-R TO TH400 SWAP
- Thread starter MAGMOEMONTE
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You'll also need a TH400 yoke. You can use the stock cross member. But, if you want dual exhaust, you'll need an aftermarket one like G Force or you can fab one. BTW, you need to shorten the drive shaft 3/4 of an inch.
what are you plans for that 200-4R after the swap?
ill take it off your hands for a price of course
ill take it off your hands for a price of course
He is probably building a drag car where it does not matter. That or he simply may not have enough money to rebuild the 200-4R to hold up to a new powerplant and has access to cheap th400 that does not need rebuilt.
new power plant will be 355ci sbc, Turbonetics 60-1 HiFi turbo, 10-12psi. th400 trans. rear diff plans include a 9", but not right away. will be street car. yes i will sell 2004-r, and will also have O.E. ac parts, P/S pump and SS gear box
Very cool. What kind of power do you expect to make with the turbo? 10-12 psi Is that on pump gas? Are you going to use an intercooler, methanol injection, a blow thru carb what kind of set up spill it man inquiring minds want to know. 
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