Regarding transmission rebuilding

Your concern is on the right path. You need to stick with the one that came out. The non riveted is non magnetic so it is different. Take a look at these charts. There is a separate listing for each one.

Also, is there a reason you are replacing this? These sun gears are fine to reuse unless the races inside the unit are scored or the teeth on the gears are damaged.

I have rebuilt a lot of 4r70's and have not had to replace this very often. In fact, I can't remember when I did. I am sure I have but it has been so rare that I can't remember. Basically if you inspect it and find no sign of damage then I would just reuse the original.

Understood. I am familiar with those customers in NJ that think because they have a hitch and as long as the trailer hooks up to it then the vehicle can tow it. I have denied many transmission claims under warranty due to overloading.

Thanks for the update. Talk to you next time. Thanks

Basically you will want to see the vehicle first and foremost. If there are other signs of overloading on the vehicle then that will add to the case.

If only looking at the transmission you want to tear it down and see what actually failed based on their complaint. The common complaint of overloading is flaring during shifting, first gear slipping, overdrive issues.

Basically when you tear it apart you are looking for signs of heat. Overloading causes transmission to get hot and heat is not its friend. Burned clutches causing the complaints. So clutches for first gear or the flaring gear or overdrive is burned up. Hot spots or bluing on drums and pistons.

If they just put the vehicle in, it is highly unlikely that there is an issue in the transmission that would cause this. So you want to then inspect all the seals for cuts or other sources of pressure loss/bleeding.

If you find nothing wrong with the unit other then the burned up clutches then the most likely cause is overloading. Clearly we can never be 100% when it comes to these things unless we have other evidence but if it were me, I would definitely push back and state that you suspect the failure was caused by overloading. You may not have a choice other then to say, we will take core of this one but if it happens again, you won't cover it. Just make sure you put that in writing on the customer's receipt.

Hopefully this helps. Thanks

Sounds great. Glad to help. Thanks for coming back to 2CarPros. Talk to you next time.