Gear Vendor and transmission swap - Diesel Forum

boblikestorque · 10-25-2009, 08:01 PM

First, I'm new to the site so thanks in advance for any comments

Working on a project truck that started out as a 1985 F250

Right now I'm working through a cummins swap

I have a stock C6 with a gear vendor but don't expect the torque converter and transmission to last very long.

Has anyone out there ever tried an E4OD with an aftermarket transmission controller and a gear vendor? Tried the search function but didn't find anything.

Joe Mc · 10-26-2009, 10:41 AM

The C6 is a strong transmission, the E40D, commonly called the DOA, has a reputation for problems.

CDX825 · 10-26-2009, 06:56 PM

The C6 is a very strong transmission as Joe mentioned and is allot more reliable than a E4OD. The C6 will take any HP a cummins can throw at it even in stock form they are very strong.

An E4OD can be made as good as a C6 as they are basically a C6 with OD but the early models had lots of issues. Unless your getting one with all the updates already you will drop allot of money quick in order to bring one up to date.

There are quite a few guys using E4ODs with Baumann TCS controllers but the only thing you really gain with and E4OD is a locking torque converter.

All depends what your looking to do really.

**Mark Kovalsky** · 10-26-2009, 07:48 PM

Quote:

Originally Posted by CDX825

but the only thing you really gain with and E4OD is a locking torque converter.

And an overdrive gear.

Garbage_Mechanic · 10-26-2009, 10:05 PM

Now Mark, just how hard was it to restrain yourself to 5 words?

Garbage_Mechanic · 10-26-2009, 10:09 PM

If you are going the C6 / GV route be sure you use a P type GV, the J type earlier one is a little weak. I have C6 GV combo in my 86, works very nice. Very nice to run 2nd gear overdrive which ends up 1/2 way between 2nd and 3rd in the mountains. Picke up 1.5 MPG on long trips, nothin locally. The way I see it you have a trade off: No electronics on one hand vs lock up torque on the other. I like my C6, but lockup would be cool too.

CDX825 · 10-27-2009, 03:35 AM

Guess I should have re phrased that. C6 with Gear vendors Vs E4OD

**Mark Kovalsky** · 10-27-2009, 07:38 AM

Quote:

Originally Posted by Garbage_Mechanic

Now Mark, just how hard was it to restrain yourself to 5 words?

I like short answers.

boblikestorque · 10-27-2009, 07:49 AM

C6 is strong - no doubt about it. From what i gather, to have a custom torque converter built, the lower limit on stall speed is about 1400 rpm - before one starts to sacrifice strength. And then it’s not a lock up.

Nirvana to me looks like – 4.10 gears, 33 inch tires, double overdrive, 70mph, 1400 RPM, lock up TC and huge mileage – without a trailer of coarse. Should be able to pull 14,000 lbs like it wasn’t there as well.

No doubt, would have to open up the wallet for a well build E4OD.

Really aiming towards a tow rig but there will be lots of 5 hr light duty highway trips as well.

blackout · 10-27-2009, 08:10 AM

For several years I have researched the auxiliary overdrive option and just remembered seeing this somewhere...
I read that the GVs have a problem with the Cummings engine, not sure which version though. It was something about torque pulses. I would do some research on this to avoid a possible problem later. Who knows, GV may have modified their design to handle this issue.