Any Transmission Or Overdrive Swap Recently

[Hummer Guy]

I know this is a dead and beaten on topic, but has anyone yet recently swapped over to a better overdrive transmission or transfer case that's readily available? If so, please tell us what you had to do and the details to it, how much you had to cut the driveshafts, did you need to move the transfer case back, did you have to move the brake hoses, and what you did for the parking brake etc?

I see tons of details and swaps for the engine, brakes, power steering, and other conversions but I don't see too many details or pictures of other transmission swaps, I know for sure there has to be somebody who has swap the transmission for a better one.

I would like to take on this task at some point so I can have a very low cruise RPM in the 55-60Mph range, while the 395s are alright, I would probably go back to the 9.00R20 size if I had a better overdrive, the truck felt way more peppy, turn sharper, and the brakes where better. I would go for another wheel and tire design over the NDTs if I took that route though.

 

[Sumner]

I really wish i had jumped on the Waterloo overdrive gears when they were still available. Been looking for an unused set, or even a trans that has em installed for a while now.

 

[biscuitwhistler37]

Not recent but I'm pretty sure @Jeepsinker has done both. If you don't want to mess with the trans, either rockwell or our version (cant remember 100% which) has a 4.90:1 swap for the axles, definitely not cheap though.

 

[Hummer Guy]

I really wish i had jumped on the Waterloo overdrive gears when they were still available. Been looking for an unused set, or even a trans that has em installed for a while now.

Yea same here, I never see any transmission with them on the market unfortunately, I never even see a truck with them on the market anymore

 

[Hummer Guy]

Not recent but I'm pretty sure @Jeepsinker has done both. If you don't want to mess with the trans, either rockwell or our version (cant remember 100% which) has a 4.90:1 swap for the axles, definitely not cheap though.

I don't want to imagine how bad the acceleration would be with 4.90s on the bigger tires with a load though

 

[Jeepsinker]

I have the Waterloo overdrive and 11.00R20 tires but I haven't changed my differential gears. I may in the future, but it's quite expensive and labor intensive.
I could've sworn that Ouverson offered a gear set in the neighborhood of the 5.13 or 5.30 range or something like that. Not sure I want to jump from 6.72 all the way to 4.90s, even with my Cummins. That would put a lot more strain on everything between the diffs and engine.

I do have an Eaton transmission that may go in someday, but I haven't done it yet.

 

[Hummer Guy]

I have the Waterloo overdrive and 11.00R20 tires but I haven't changed my differential gears. I may in the future, but it's quite expensive and labor intensive.
I could've sworn that Ouverson offered a gear set in the neighborhood of the 5.13 or 5.30 range or something like that. Not sure I want to jump from 6.72 all the way to 4.90s, even with my Cummins. That would put a lot more strain on everything between the diffs and engine.

I do have an Eaton transmission that may go in someday, but I haven't done it yet.

Yea, I've considered the OD Eaton 5 speed, but the one that can fit is very hard to find. I went from 395s back to the 9.00R20. I feel like the 395s put way too much stress on the truck and it really turns the truck from a slow goat to a slow pig, not to mention how awful the brakes are with 395s. I really would like to get 2,000-2,200 RPMs at 60Mph on the 9.00R20 tires.

Before anyone says it, my brakes are 100% operational and works perfect

 

[williamh]

I went with the 11rX20 tires. Get a nice smooth ride and it doesn’t put strain on the drive train ie. rubbing on anything.