I have a 700R4 from an 89 GTA.... it started spewing fluid, thought it was the front pump seal, it was, and is. I changed it, and it still leaked... I am going in to do it again tomorrow. No play in the input shaft, so the bearings are fine... gotta check the TC collar for grooves though. Any other hints to make sure everything goes in right this time?

Also, a WCT5 will be going in soon, I have a 2.8 with a 5 speed setup. Will the BELLHOUSING fit on my WCT5, and bolt up to the 350 block???

THANKS GUYS!
Tris

 

There's a bushing and 3 teflon o-rings that if cut or if the bushing is excessivly worn could be causing leakage and pressure buildup behind the front seal. Also clean the bore and outer area of the seal well with thinner or acetone and use red loc-tite. If you need to change the 3 teflon seals they need to be 'sized' to fit in the grooves. One cheap way of doing this is to cut all three off, cut a strip of a plastic dixie cup to wrap arounf the input shaft to protect the seals from the splines and place them in starting with the lowest one. Once they are in place, put the dixie cups around the outside of the o-rings and wrap a heater hose clamp and tighten them. This will size them into the grooves. If you skip this, when you slide the reverse drum over them, they will be damaged.

 

Even though the '89 had better drain back passages they still (to this day) haven't opened the passage on the stator side of the pump. You should also make sure that the pump bushing isn't too worn, which it likely is. Check the neck of the converter too and if it has ANY wear, replace it.

The 2.8 will not fit a 350 block as the bellhousing has the noermal Chevy point at the top and the 2.8 has a smaller bell with a flat top.

 

Transfixleo, would I be able to change the bushing myself? I just reseated the TC, I don't think it was seated all the way... and a steady stream of fluid is still bouncing off of the TC. I can't think of what to do next. Any help would be greatly appreciated.

Tris

 

It would be better to leve the bushing install to a tranny shop, preferably one with a press (that will use it). IF the converter wasn't in all of the way then you may have taken the pump out.

 

I still remember the first time I drilled out a drain back hole in the pump of a 700 after attending an ASTG gathering. I looked at the stator half and saw the matching hole there was a bit small. I used the same drill bit for that hole too.

A couple of the other builders thought I had made a mistake......

I've wondered over the years how many other ppl figured that out too.



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It is important to point out that even though the later models had the drainback drilled (in the pump body at least) that they didn't always proprly drill them. I just did one from a '96 the other day and they hadn't drilled it through where the two angles join. It was open but it was similar to the older pumps in area right at the bottom!