(HELP)Rebuilding/upgrading my stock transmission

[Sergio Mendez]

Hi guys,

 

Wondering what I have to do to upgrade the stock transmission for my 2007 new body style. Not sure where to start.

 

Car is around 325k miles and engine was rebuilt 20k miles ago. Transmission is working fine but has never been rebuilt. I'm using the truck now to tow my Toyhauler. 

 

I'm afraid that one day towing the transmission might blow up or leave me stranded while towing.

 

From what I understand, rebuilding trans with a HD kit should help alleviate some of the extra strain when towing. Care to guide me in a better direction? Happy to answer questions.

[swathdiver]

You'll want a billet torque converter with the updated Sonnax parts for starters.  Sonnax has just about everything listed to make the transmission new and stronger than it was new.  

 

If you are doing the overhaul yourself, watch this guy's tear down videos where he explains the weak spots, shortfalls and how to beef them up.

 

https://www.youtube.com/c/PrecisionTransmission

[dna9656]

I got my 4L60 E upgraded to a 4l70E when I rebuilt it.

[Sergio Mendez]

22 hours ago, swathdiver said:

You'll want a billet torque converter with the updated Sonnax parts for starters.  Sonnax has just about everything listed to make the transmission new and stronger than it was new.  

 

If you are doing the overhaul yourself, watch this guy's tear down videos where he explains the weak spots, shortfalls and how to beef them up.

 

https://www.youtube.com/c/PrecisionTransmission

I won't be doing the install, my trusted mechanic friend will but I want to research and supply the parts instead of having him choose. I know sonnax has a lot of parts I'm just not sure what to look for. I'll take a look at the videos you sent and will send also to my friend to take a look. Thanks!

 

5 hours ago, dna9656 said:

I got my 4L60 E upgraded to a 4l70E when I rebuilt it.

 

Hi, care to elaborate? How is that done? Or do you had a full new transmission installed? Is there a kit to rebuild and convert? Sorry I'm new to transmission.

[dna9656]

On 6/12/2022 at 4:55 PM, Sergio Mendez said:

I won't be doing the install, my trusted mechanic friend will but I want to research and supply the parts instead of having him choose. I know sonnax has a lot of parts I'm just not sure what to look for. I'll take a look at the videos you sent and will send also to my friend to take a look. Thanks!

 

 

Hi, care to elaborate? How is that done? Or do you had a full new transmission installed? Is there a kit to rebuild and convert? Sorry I'm new to transmission.

I paid a local pro, he offered the upgrade, it included more steels and clutches, prolly Corvette servos. The cases are the same. I'm sure Sonnan offers a kit and has a full description of the kit.... Look them up and give them a call, they can best advise you on their stuff.

Edited June 18, 2022 by dna9656

[swathdiver]

A 5 pinion planetary is a nice upgrade.