FWIW, I had the Lubegard 8 fluid in the trans for about 9 months when the shudder started. I then did a fluid drain/fill with Valvoline Max ATF, but the shudder remained (no worse, no better). That's when I tried the Shudder Fixx.
rickjkline, I was extremely skeptical about 'shudder fixx' and I had already picked out my new torque converter from Moe's, because I was certain it would not work. However, I was completely shocked after 24 hrs.
I can't explain it...and I have no idea how long it will last, but I can confirm...
with the AC running, grab the AC lines and note where the temperature changes from hot to cold (normally sweating). The location of the temperature change is where the orifice tube is located as the freon transitions from a high-pressure gas (hot) to a low-pressure gas (cold)
So...I added 2 ounces of Shudder Fixx to my 8HP70 and after 24 hours, it has eliminated the shudder and locking/unlocking at cruise!!!!!!! This stuff is a miracle worker.
I realize this is a temporary band-aid, but still, for $10 it bought me some time...
Lately I've noticed that the transmission (8HP70) takes about 15 minutes to driving to get to its normal 190F temperature, but once it gets there, the RPM surging is either gone or unnoticeable.
Glenn, I saw your post in an earlier thread. Nice writeup.
So far. I've priced the following (parts only];
1. Torque converter - new custom = $600 to $1500 usd
2. Torque converter- new oem = $800 to $1200
3. Transmission - used = $700 to $1400
4. Transmission - new = ?
I've read all the posts on here about transmission shudder, but I've not seen many solutions or fixes.
So, if you have the 8HP70 transmission, have experience shudder between shifts and fixed it, please tell us what you did to fix it
If you must level the pan and not the truck, how in the world do tranny shops get the pan level on the lift? Leveling the transmission pan on a 8HP70 in a RAM requires the rear of the truck to be elevated by about 12", which can't be accomplished on a lift. It can only be accomplished on the...
If you have the ZF 8-speed tranny in your truck and you've changed trans fluid, can you tell me if you
a) Leveled the truck ---- OR -----
b) Leveled the transmission?
Given the angle that the trans sits in the truck, I suspect you must level the trans to get all needed fluid in per the OEM...