My dealer is telling me I need to replace a transmission cooler hose, part # 20788334. They are unable to locate the hose. I've been trying to find one myself without success. I did find it on Amazon, but it was out of stock and has been for a while. I'm hoping there is an after market part that duplicates it, but haven't been able to find anything. Is there another part that can substitute or is there a source other than Amazon, Rock Auto, Auto Zone, O'Reilly, Ebay and a place called OEMCats.com?

Thanks in advance for any advice.

 

Why, pray tell, is your "Dealer" telling you to replace that hose? What is the issue?

You can make a better hose for that by yourself, either from scratch or by using the metal ends and double clamping a Trans Fluid compatible Hose over them.

 

The hose is only a small section of the transmission cooler line assembly to allow flex of the line while driving!
Fluid leaks at the hose section is due to the band clamps deteriorating not holding proper clamping pressure.
Simply cut those band clamps & replace with HIGH PRESSURE hose clamps shown below:




MADDOX Mini Fuel Injection Style Hose Clamp Kit, 40 Piece

 

A little off topic rant based on this thread ...

Looks like you need a mechanic, vs. an "automotive technician" to help you get your car back on the road. Back in the "old days" a mechanic was someone who knew how to repair a part to make it serviceable. Fast forward to today and we have "ASE certified automotive technicians" who seem to be really good at remove and replace, but not so good at getting someone back on the road for not a lot of money.

Hummerz's "fix" can be done on the car in about 30 minutes with $2.00 worth of clamps and will outlast the transmission. The dealer's solution requires a discontinued part and hours of labor - costing you much more, all for something that performs no better than the mechanic's "fix."

I'll take a mechanic over a technician any day.

 

I think almost every GM truck I have owned started weeping (leaking) where their factory crimp at the metal connection begins to fail. If I remember right, they had a recall on some old GM trucks as the hoses would blow apart at that crimp and killed some engines due to oil starvation? On a '95 GMC I replaced the same factory hose three times and it still began doing it again. After that I no longer buy replacement Oil Cooler or Trans Cooler lines, just fix them with a piece of appropriate hose double clamped on the metal ends. I now use a flare tool to make those repairs better, but even without any flare I have yet to have one of those double clamped repairs leak again.

For sport, I have remade a few lines with AN Fittings and braided hose for the overkill effect.

NMH3 I hear ya, my thoughts as well.

 

Correct! I've been repairing automobiles since the '70's & working in automotive service repair business. As an automotive service adviser I spent too much of my time assisting the "MECH'S" & "TECH'S"! Now retired I DIY!