700r4 TCC woes - Transmission Problems


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700r4 TCC woes

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Auto Repair Home>> Automotive Repair>> Transmission Problems

kjones6039
New User
kjones6039 profile image

May 30, 2012, 9:43 PM

Post #1 of 3 (2251 views)

700r4 TCC woes	Sign In

I posted this on another forum but got no responses. Perhaps I will have better luck here.......

Long story as short as possible......

Bought a 700r4 about a year ago (from a company i won't name right now) to go behind a 383 in my 79 Corvette. This is a Sunday driver and occasionally gets a workout at the drag strip.

About a week after I installed it I broke the band anchor. Instead of shipping it back I elected to replace the anchor and get back on the street. (of course that voided the warranty)

I replaced the anchor and all has been well since last year. Recently I took a road trip (about 500 miles) and found that the converter clutch (when locked) is slipping under moderate throttle in 4th gear. Note: I have the ECU programmed to allow lockup in 4th gear only.

I pulled the transmission over the weekend and the internals look fine, reenforcing my belief the the TCC is to blame for the slippage.

NOW, today as I was looking at the input shaft I noticed that the check ball capsule is NOT installed in the pocket on the shaft. It is my experience that this is done in NON lockup transmissions. (along with a plug in the pump body IIRC)

I'm guessing that they sold me a non lockup transmission with a locking converter.

Any of you 700r4 guys want to weigh in on this one?

Ken

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 31, 2012, 2:03 AM

Post #2 of 3 (2201 views)

Re: 700r4 TCC woes	Sign In

Quick look - there were no 383 OE engines for this. It's altered, beat on at drag strip and not surprised you are not getting much help on the web.

Perhaps you have a typo there but may need a trans specialty shop to check this out in person IMO,

T

kjones6039
New User
kjones6039 profile image

May 31, 2012, 9:55 AM

Post #3 of 3 (2174 views)

Re: 700r4 TCC woes	Sign In

In Reply To

Thank you for your rather terse reply!

Your "Quick look" assessment is most certainly correct. The car was originally produced with a 350 ci L48 engine, rated at 195 hp and a TH350 transmission.

It appears that I missed something in my zeal to register here. I had no idea that questions regarding non "OEM" issues were not acceptable.

Please accept my most humble apology and feel free to remove my registration at your convenience.

Sincerely,

Personal info deleted

(This post was edited by Hammer Time on May 31, 2012, 9:58 AM)

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