Figured this forum was the appropriate one to place this as my application is the 4r100 for a 7.3L. Background: Transmission in the truck appears to have busted the center shaft or something as I lost all gears and reverse. So I snatched up a used trans with only 50k on a Ford Reman. I installed it and it decided to blow the seal out. So I had to drop it right back out. But this pump is in there TIGHT!

The problem I am having is stripped pump threads. The two you put a slide hammer or other puller in to pull the pump. I have a homemade setup out of some threaded rods and an angle iron across the bellhousing. Worked great on the other trans. Was working fine, nearly had it out when the threads came ripping out! I KNOW those two threads are 10mmX1.5. So I used the right stuff. But this pump seems EXTRA stuck. I'm glad I didn't waste my time renting a slide hammer, it would have never worked.

So I'm needing a new solution. I do have a backup pump if need be from the last transmission. I already pulled it today and cleaned it out and put all my new stuff in it. Would it be possible to tap a couple different holes? I need to get to this pump out as my other transmission is not feasible to rebuild right now. Costs too much moola. I just started a new job, so it has to make it through to January. What do y'all think? Any other ideas? Thanks in advance!!

 

Get a Helicoil kit and repair the stripped threads. The repaired threads will be stronger than the original threads.

 

What is the difference between that and just tapping it out to like 7/16"? Because the 10mm is like .394 and the 7/16" threaded .438. It fits in the holes for sure if I tapped it. Just wondering if there is any dangers. Like flakes of metal dropping down these screw holes. Or if it is feasible to maybe tap 2 other other holes to have 10mmx1.50 threads. Hell, I have enough material that maybe its better to do 4. Do one turn each until it pops free?

Is the pump itself aluminum? Maybe that's why the threads aren't strong enough. And yes my filter is already pulled.

EDIT: Damn those are pricey. 😂🤣

 

The pump is aluminum. Helicoils are steel. Either way, you have to drill and tap, But this way you have steel threads inside of larger than original aluminum threads, and you use the original size bolts.

 

Any other time this might be an option. But helicoils are not in the price range or time frame. So I think I'll just tap two other holes and pull it out or do the 7/16" in the existing holes as I stated. Thanks for the advice on them though.

 

I did end up getting the pump pulled after tapping two new threads elsewhere. The problem ended up being a weld that wasn't cleaned up when the transmission case was fixed. I cleaned the weld up and now it fits well. However I somehow knocked the overdrive bearing off and it fell through the filter hole and into the transmission pan. 🙄🙄🙄