I have a newly rebuilt transmission that slips briefly at around the 30 mph mark and no diagnostic codes show up when checked. It's a 2007 Ford Escape automatic with 144,000 miles. The transmission was rebuilt about a week ago, and it started slipping within four days (~200 miles.) I guess I don't understand diagnostic equipment. Do the devices only report some issues?
Hi, I worked on transmissions for a while - mainly dual clutches.
Your scan tool can not access the data stored in the transmission, it requires a special $1000+ scan tool and yearly software updates costing $100-200. And even then, the transmission may not communicate properly and not show it’s trouble codes (a very typical Ford issue. Happens a lot of their 2012 and newer Ford Escapes with the PowerShift)
When rebuilding a transmission, always go to a place that gives you at least 6 months unlimited mileage warranty.
Cause it wore out at only 140,000 miles the transmission probably didn’t wear out by it self, something IS causing it to wear out faster. Maybe a shift solenoid isn’t responding properly, maybe the valve body is clogged up, maybe the oil pump is stuck in a low pressure state, or it can as simple as a matter of programming… who knows, unlike DCTs (where you replace everything that could’ve possibly worn out (pump, forks, clutch frictions, metal spacers)) automatics are hell to rebuild.
Take it back, they messed up the rebuild and I don’t care what they say but they got to make it work 100% correctly.
If they can’t fix it, it’s not your problem how much labor they put in or how much parts they spent (you paying for a service you didn’t get, so it’s not your issue how much they lost)- you should get a 100% full refund.
I would take it back to whoever rebuilt it because they obviously didn't do it right and this is why Scotty has said for YEARS not to rebuild transmissions for this very reason almost no one knows how to rebuild them and if it's already slipping they obviously didn't know what they were doing. Ask them to fix it right or give your money back.
I worked on trannies, I don’t anymore so I can tel you the truth (what are rebuilds that should be done, and what are things that you need to flat out avoid doing)
Let’s get it straight:
On some transmissions, “rebuilds“ (- replacing all parts with a tendency to wear out) are simple and you should definitely do it.
Replacing the terrible OEM solenoids with aftermarket ones on a Renault DP series.
Replacing the rear seal and friction plates on the Dry Powershift (Focus / Fiesta).
replacing the clutch and actuator on the Toyota C50A (Toyota MMT, on the 08’-10’ Corolla and all Toyota AyGo modes)
These are all cheap and simple jobs that typically need to be done around 60,000 miles – you’re just replacing the parts that are worn out while inspecting the rest.
BUT, on automatics with over 150,000 miles or more that have not a specific issue, but general wear - a rebuild is *never the best option*.
everything is worn out on even ok automatics like the Toyota U760 or AISIN TG-80SC and even if you fix what’s wrong - shortly the next issue will pop up.
Cool I've never done any major trans work so thanks for the heads up dude 👍
Take it back to the shop and demand a fix or a refund. You don't need to be troubleshooting it yourself.
