90 F250 4wd ext cab 460 auto w/overdrive

any complications or guidance on this conversion?

We know we won’t have overdrive and thats fine for our application.

The following thread has been helpful.
converting from E4OD to C6 - Ford Bronco Forum

also considering a gear vendor with all the money saved.
the following thread has been helpful.
https://www.turbodieselregister.com/...dor-vs-US-Gear

any further input is appreciated. Thank you.

Huh!? For the price of a Gear Vendor overdrive I’m fairly certain you could have bought another E4OD. You never said what is wrong with the transmission in the truck other than you are replacing it for the C6.

I like the C6 that came in my Bronco but in hindsight I should have put in a built AOD.

Im not sure long a transmission would have to be around for a “track record” but the E4OD has been around 30 years.

More info...
Transmission failed while driving. Just stopped moving the truck.
Truck does not move (by pushing) when in park. Meaning the transfer case is good.
No noises from trans in any gear at any time.
Something is broken inside of transmission and the estimate to determine what it is....800$ MINIMUM.

“Estimated” by 2 trans shops in the local area are for stock build and rebuilt standard tc is 3800 Installed 2yr 24 mo warranty.
With the original 1990 case (173k) and no upgrades. Not including any parts that are broken inside and replaced with used parts from other trans on shelf. Can save 600$ to drop and install myself.
mail orders are available for 1800$ and those are not really an option do to the nature of the warranty process.

C6 rebuilt locally by 30 year trans vet is 800 plus tc.
Drive shaft and trans support modification by local 4x4 shop is 500$ With no more than that price guarantee. Maybe less.
Gear Vendor with all the benefits it supplies shipped to my door 3500$. Install chalked up as learning experience so 0$.
Ok, so 1000$ more than an e40d rebuild...maybe...because those are estimates. And we are left with a plain rebuilt e40d.

Track record for the e40d compared to the C6..... really?
These factory overdrive trans are built for the masses where John and Jane Doe are not climbing mountains with loaded
trailers where 40mph is the max limit. And our traffic is always moderate so be aware of slow people reducing any momentum.
Also considering any flatland driving where overdrive is warranted, we will still be able to drive 65 which is speed limit and 55 with a trailer which is the limit.

An overdrive in a tow rig transmission seems to be the weakest set up. Even with a stock motor. Then its 4wd also.
They can be built for good money and nothing is wrong with that. A friend built a 5000$ e40d trans and still blew it up short of 2 years. It’s always happening with them in normal conditions and when we start “working” them...wow. (Probably going to read from someone who has “towed mountains” for 200k on factory tranny and still going strong... but 1 out of 10 is batting 100).

We do not need an overdrive and the GV will be used from 30-55mph. We live in the mountains where those extra gears will be very effective climbing our steep and curvy roads. More so, it seems, than any factory overdrive. Which seems to be taken care of with the GV and the C6 can just do the thing its done for oh so many more years with much higher success than ANY overdrive transmission.... because its not an overdrive transmission. Less to do, fewer components, cheaper to build at any level.

The Gear Vendor can do what its designed to do and has done for many years. The company is still in business and doing very well. It’s an upgrade on any vehicle and sought out for some people. It has great reviews and has its purpose handled with awards.

Anyway, thats the reason and logic at this end. Nothing definite yet. We just found an e40d with 70k for 600$... lol!-)