rebuilding my 4l80e with a jakes D1 transbrake and stage 2 overhaul kit. im not sure if this reaction carrier is good or not the grooves pretty mutch match up with the grooves in the band.also im not sure if i leave this seal out in the case the brown one for output shaft, this is an early transmission that had a bolted in yoke and i will be using a slip yoke. i also ruined the black oring seal it tore when i pulled tail housing off.can this be replaced? it seams to be part of the plug with the orfice. thanks for the help.


these grooves in middle of drum match band, is drum shot?

does brown seal stay when i convert to slip yoke and can plug/oring be changed part number for plug?

 

That brown seal always stays.
You must have an early core 4l80e. (pre 95)
You will hear mixed reviews on the planet. Personally, if you see railroad tracks...it's no good.
There will be guys that tell you they've run it and had 0 issues. They are probably telling you the truth. They DID run it and they DIDN'T have issues. But I don't like the risk.
Regardless if you use a new planet or not...make sure you set proper band clearance. You may have to weld a ball on the tip to make the pin longer and grind it to get correct clearance.
.060 is a good target regardless of what your book might tell you.

 

thank you for the help. i will get a new reaction carrier. are the early and late ones the same or different? what is the issue with the pre 95 planets, are they not as strong? and is that cup plug with the oring replaceable? thanks for your help and patience with my questions

 

Cup plug with o-ring should have came in your overhaul seal kit

Reaction carrier for pre 95 had different finish for the grooved band. It was also a different hardness. TH400 and early 80e planets were 15RC on the band surface. Newer 80e stuff is 20RC. Plus the newer bands are Borg Warner HE material and therefore they don't wear the drum as aggressively.

 

thanks for taking the time to explain this to me i appreciate it
nick

 

FYI, the th400 and early 80 planets are not weaker by any means. Just the band surface is a little different.
Proper band clearance and hydraulics to the servo and you'll never have an issue with either one

 

i understand, but since in will be using a new band i should start with a new or used carrier that is smooth? so not to have any problems.

i have been doing alot of reading up and one thing always seems to pop u the most is how important that clearance for the rear bavnd is

 

you can use a newer smooth reaction carrier and a new band.
If the drum is in "good used" condition, that would be just fine.

And yes...clearance is critical

 

great!! thanks again
nick

 

MaroonMonster's recommendation of 0.060" clearance for low-reverse band clearance works well.
I like the short apply distance.
I do however find that this normally creates slightly more drag than ideal... And add a shim under the cover.

Shown here:


I also normally pair the older carriers with the older style bands and vice versa.

Here are two articles for you to continue your desire for knowledge going.

Reverse Drum Wear: a 4L80-E True Story

Diagnosing the Elusive NO REVERSE with the 4L80-E

 

WOW thank you!! i will read this tonight when i get home from work
nick

 

A for those reading/wondering how a shim would help? Let me tell you.
The band clearance is set at .060 so that the servo won't ever in its life "bottom out" in the bore. or run out of travel.
This tight clearance also does create some drag.

The servo shim will let you to still set the clearance at .060, but then come further out of the bore.
This keeps the bottomed-out distance the same, but lets there be less drag.

Personally...I don't bother with them. But I've refreshed units that have had them and I have no worries or issues reinstalling them.

 

any idea where is the best place to find a good used drum?

 

WIT or Transtar are usually easy places to get them

 

thanks!!!
nick

 

thank you read last night and a whole bunch of other stuff... great info

 

ordered the parts i needed from WIT, thank you they were great to deal with