[jdshort98]

With gas prices today I have been thinking about better fuel economy. I have a 72 C10 with a 350, it is the Mexican Made target master long block with a Holley high rise dual plane and a 670 Holley Street avenger.

My question is this...mechanically I can bolt in the 700 R4, change around the support structure and shorten the drive shaft, but what else has to be done? Do all 700R4's require some type of computer for the lock up torque converter? I know there is a TV cable to install, but the electrical part is where I am not sure.

[SSedan64]

The 700R4/4L60 doesn't require a computer. You will need to run a power wire & switch to lock the TCC/TorqueConverterClutch. If you don't lock the TCC in 4th/OD it will cause overheating & trans death. The 4L60E does require a computer. It doesn't have a TV cable all shifts are computer controlled.

[jdshort98]

The switch you speak of, is that the one on the brake peddle to disengage the covertor? Has anyone made this conversion on a truck similar to mine? Any suggestions on which 700R4 to look for?

Thanks!

[SSedan64]

You can hook up the TCC several ways. The easiest way is to screw a pressure switch in the pressure port plug on the rightside of the trans, run power from a toggle switch to it and then to the electrical plug on the left side of trans, the torque converter will only lockup in 4th gear when the switch senses pressure after the 3-4 shift. You can turn off the toggle switch around town if you want. Most reccomend the 87 & up 700-R4 because of better internal parts.
I would just use a TH200-4R trans. You wouldn't have to change the crossmember or driveshaft length with the 2004R. Just bolt it in, hook up TV cable & TCC switch and your done. You can use the brake switch to disengage the TCC if nessesary. May not be needed since the trans usually downshifts out of 4th upon deceleration anyway.
There's a kit on Ebay for $14.99 that has the pressure switch,wiring,instructions etc.

\http://cgi.ebay.com/ebaymotors/700R4...QQcmdZViewItem

[elg78336]

You can go onto summit racing and buy the kit to make the trans lock up. I am thinking about it myself. I have a 91 camaro that I have taken all the computer stuff out of it.

[jdshort98]

Thanks for the advice, and link. Is the 200R4 as tough and dependable as the 700? What year models to look for when shopping for a 200?

Thanks!

[JeffB]

[QUOTE=jdshort98]Thanks for the advice, and link. Is the 200R4 as tough and dependable as the 700? What year models to look for when shopping for a 200? 1987 to 1989 are the best years,they have all the improvements the earlier ones did not,if you get an earlier one use a Trans-Go kit on it(the $100+ one) and that will address the bugs and weaknesses of the earlier ones.

[SSedan64]

JeffB is correct 87 & up are the best stock cores to start with. They came with a 10 vane pump rotor and the pump housing had a shoulder machined in to keep the bushing from walking forward & taking out the pump. The Transgo 2004R-HD2 kit is the cheapest most complete kit $85 on ebay. I'd get a hardened Stator Support for it too @$30. If you can find one out of a MonteCarloSS or BuickRegalTurbo/GN they have the best stock valvebodys & governors. If you plan to throw over 400-450HP at it you'll need a hardened or billet forward drum. They're not cheap but with that part & HP clutches it'll handle 650-800HP.