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Old 09-09-2011, 09:51 PM
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Converting non-lockup 700R4 to lockup

I have an '88 700R4 trans that was originally built by TCI as non-lockup. I'd like to convert it to lockup. Is the lockup wiring/solenoids all that is needed? Are there any other valves in the valve body or pump that are needed to make it work? I haven't taken the pan off yet (hopefully this weekend I'll get it off), but I do know that there is no o-ring on the input shaft, no check ball capsule in the end of the input shaft, and no electrical connector on the side of the trans.

Thanks in advance,
Steve

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Old 09-10-2011, 05:50 AM
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Quote:
Originally Posted by V8TEC
I have an '88 700R4 trans that was originally built by TCI as non-lockup. I'd like to convert it to lockup. Is the lockup wiring/solenoids all that is needed? Are there any other valves in the valve body or pump that are needed to make it work? I haven't taken the pan off yet (hopefully this weekend I'll get it off), but I do know that there is no o-ring on the input shaft, no check ball capsule in the end of the input shaft, and no electrical connector on the side of the trans.

Thanks in advance,
Steve

You'll need to swap out the Non-Lockup Valve in the Pump to the stock TCC Apply Valve, + Solenoid,Wiring, Pr. switch, and O-ring. The Capsule in the end of the Input Shaft is optional, if you leave it out when the TCC locks it will feel like a 5th gear, very firm engagement. This isn't great for the Converter's clutch tho'.

TCC Apply Valve example>> http://www.sonnax.com/product-lines/...ion/parts/1803
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Old 09-10-2011, 07:24 AM
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Thats it huh? Excellent. Thanks for the info.

My 87 GN's 2004R had the check ball deleted and yeah, it engaged very firm. Not sure what converter I'm going with yet, but I'll probably put the check ball in the input shaft this time.

So in addition to the Sonnax valve, I could use these parts to complete the kit (plus the check ball & converter)?

http://www.summitracing.com/parts/TCI-376600/

http://www.summitracing.com/parts/TCI-376601/

Last edited by V8TEC; 09-10-2011 at 07:42 AM.
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Old 09-10-2011, 07:37 AM
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Quote:
Originally Posted by V8TEC
Thats it huh? Excellent. Thanks for the info.

My 87 GN's 2004R had the check ball deleted and yeah, it engaged very firm. Not sure what converter I'm going with yet, but I'll probably put the check ball in the input shaft this time.

Unless TCI does not use a kit to modify the oil flow circuit. A visual inspection with pan off will answer the question if a kit was used
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Old 09-10-2011, 07:43 AM
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Crosley - Thanks. I'll yank the pan this weekend and post a pic of the VB.
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Old 09-10-2011, 07:51 AM
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Quote:
Originally Posted by V8TEC
Crosley - Thanks. I'll yank the pan this weekend and post a pic of the VB.
the 'kit' for non lockup is installed in the pump, not valve body.

You will need to remove the snap ring from the bore where the TCC valve installs to see if a 'kit' was used for non lockup.

there are 2 snap rings seen from the bottom of the pump with pan off .... one is half the size of the other in diameter. Small snap ring is for TCC and is where the 'kit' may be installed
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Old 09-10-2011, 07:53 AM
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Gotcha. I'll look for that.
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Old 09-10-2011, 09:25 AM
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There're also 2 different style Kits.
TransGo & Sonnax styles are simpler, no Cup Plug removal, Drilling or Tapping involved.
Art Carr's Kit uses the slightly more complicated method, Cup Plug removal from Pump & Drill/Tap orifice & install a Set Screw to lock the TCC valve in place.
Example> http://www.gnttype.org/techarea/tran...nonlockup.html
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