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-   -   700r4 conversion install problems (http://www.hotrodders.com/forum/700r4-conversion-install-problems-209357.html)

Steves68Camaro 11-26-2011 06:29 AM

700r4 conversion install problems
 
I recently installed a 700r4 transmission in my 68 camaro which had a turbo 350 in it. The rebuild went smoothly until I bolted the tranny to the engine and started it up. There was a loud clacking noise coming from the Torque converter. This was a B&M torque master 2000 stall brand new that was filled with fluid before install and seemed to slide into the tranny with all the proper clearances. when I bolted the tranny to the block, I had about 1/4" clearance between the flywheel and the converter. I did not install a new flywheel. I pulled the transmission back down and removed the converter and installed another new torque converter this time from TCI. Reinstalled the tranny and got the same result. Any help would be greatly appreciated as I am on the verge of insanity.

tnsmith10 11-26-2011 06:57 AM

sounds like the flex plate is cracked/broken or you have a pump assembly problem, or you have the wrong input shaft for the converter you have. they come in 27 and 30 spline

Steves68Camaro 11-26-2011 07:35 AM

The transmission I rebuilt was out of an 87 vette. it is a 30 spline input. The noise I hear happens wether or not the transmission is in gear. I have not removed the pump yet and I re-used the flex plate that was on the engine but did not see any cracks. Is the 1/4" clearance between the flexplate and the converter correct?

Steves68Camaro 11-26-2011 07:43 AM

I did have another symptom when I drove the car, I did not have reverse. I pulled down the pan and checked the PV valve to insure the clip was installed properly (read about that somewhere) and it appeared to be installed correctly. I did take the pump apart and rebuild it along with the tranny.

Steves68Camaro 11-26-2011 10:19 AM

I dropped the pan again and pulled out the tvalve boost and found that the plunger for the reverse boost valve slipped inside the spring that came with the Fairbanks shift kit. Does anyone know if this would cause both the clacking noise and the reverse problem i described earlier? Any advice would be appreciated. Thanks

SSedan64 11-28-2011 03:54 AM

Did you set the Rotor & Slide clearance correctly when you rebuilt the Pump?

The Stem on the end of the Pressure Regulator Valve will keep the Low/Reverse Boost Valve inplace, keep it from going too far into the Pr. Reg. Spring when assembled. Needs to be assembled from the bottom of Pump. If it was assembled with the Pump upside down the Low/Rev boost could've been cocked out of place. This would cause problems but, I doubt it would cause the clacking noise.

Most recommend 1/8" - 3/16" clearance between TC & Flexplate before sliding it forward. More than 1/4" requires Shims between TC & Flexplate.


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