X2

 

that is/was a popular swap for the 700r4s, but i don't know of anyone swapping a 4l60e for a 400. it can be done, but if you are carrying all that weight, and if you use overdrive, then a 4l80 or 4l85 e is the way to go. they can also be configured to run with a standalone module, and you'd have to get a custom program for a th400, as the pcm will think the tranny is missing.
good luck. db

 

I didn't think about the 700R4. Pros/cons of this swap. The 80 and 85 e are kinda expensive

 

700R4 and 4L60E are the same exact transmission with the exception that the 4L60E is electronically controlled with solenoids. You will get no advantage switching from 4L60E to a 700R4. You best bet is to put a 4L80E in that tahoe. Save up a few extra bucks and do it right, besides how many thousands have been wasted on new trannys already. With a solid 4L60E you should have no problems, just make sure it is done right.

 

Go with the 4L80E. You will not regret it. Similar to the TH400 in strength you get a 4th gear (which the 4L60E already has) and you have electronics. So its will better hookup to the Tahoe. But you will need a new transfer case adapter 4L60 and TH400/4L80 are different.

 

Go with the 4L80E. You will not regret it. Similar to the TH400 in strength you get a 4th gear (which the 4L60E already has) and you have electronics. So its will better hookup to the Tahoe. But you will need a new transfer case adapter 4L60 and TH400/4L80 are different.

But they should both still use the same flex plate...correct...i am also interested in doing this swap because i too am tired of rebuilding the 60e's

 

Unless you are going to get into a stand alone harness for the trans I would go with a th400. Flexplate will work years back I used one from B&M when i swapped my race cars trany over to auto (th400) If you want to keep the speedo function you will need a electronic speedo sensor and reluctor from a early 90's 454ss pickup (i just bought one new myself) Speedo will still work fine then.

4l60e's are a waste of money in my opinion as they are a weak trans and take tons of cash to make hold up to abuse. (just my personal opinion though)

 

You guys obviously aren't getting the right build up for 700's and 4l60e's. Properly built, they hold up excellent!! I have got a bunch of them out there to prove it, behind big block vortec motors and 383 strokers........... Get that 4l60e built right, that 350 in the Tahoe shouldn't be able to damage the trans, unless maybe he's doing neutral drops or something extremely abusive like that....... Otherwise, 4l80e!!! either way, put a trans temp guage in and make sure that it stays running cool!

 

4l60 e's really leave a lot to be desired...they are basically soccer mom weak transmissions...a 700r4 is a better choice for longevity they have been around far longer..are cheaper and have a huge aftermarket parts base...also the bugs have been worked out of them and all the weak points have been adressed because of the length of time they have been around...however if you swap to a 700r4 in the vehicle...it will be a total fab up job...the output yoke splines are different...the anti lock brakes will no longer work because the brakes are based off the transmission driveshaft for the rear....and the pcm will need reworking also.

 

the 4l60e is a 700, but with all the bugs worked out. if u keep havin trannys rebuilt, then whoevers doing it is doing a bad job. dont put a 400 in, ull hate it after a day they take so much power just to run them and then the first gear is real horrible. take that 4l60 somewhere else to be built, or better yet go get one out of a salvage yard, maybe something is wrong with your tranny that a tranny shop cnat fix, or dint notice, such as a hairline crack somewhere. go get a good tranny from the yard and that should be the last one to replace.

 

700r4 and 4l60e are not the same trans at all....its like saying a ls1 is the same as a regular 350...not at all the same....ok in my opinion a 700r4 is a better trans as far as strength and reliability because of the multitude of aftermarket upgrade parts that can be installed....and they are right in saying that it is most likely the rebuilding shops fault...however...i would say that 98% of trans shops only do a "stock" rebuild on them using the cheapest parts available...and most dont do any high perforamnce or upgrade work that i know of....you would have to find like a race car shop or offroad shop that specializes in upgrading the internals of the 4l60 to survive abuse....they probably just keep rebuilding it to stock and thats why it keeps going out.

 

As said. 4l80e. I grenaded some time ago a 4l60 and compared to a th400 (this i rebuilded sev. times, the 4l80 i never disassembled) its a weak trans. But th400 is also old, just 3 gears, no lockup conv... So why mess around and try something (HD) rebuild when you can get a strong 4l80e right out of the box. Only disadvantage is the trans adapter you need. We installed one in a bb suburban after some killed 4l60 and no more worries...
...yes its more heavy and needs more power
hmmm...the 4l60 is a 700r4 (changed name around 90 or so) and was updated with electronic solenoids a little bit later. Some changes also. So the 4l60e is the successor of the 700r4 ... yes 4l60(e), 700r4 are all "ey are basically soccer mom weak transmissions"
You can also bring a v6 to v8 power but why not use a v8 when you have the choice...

 

cost mainly...its a lot cheaper to build a bulletproof 700r4 than buy a 4l80e...other than that...yes the 4l80e is a good trans but very costly and for the price you are buying a stock trans...where you could build up a sweet 700r4 and really have something...like i siad its just my opinion that 700r4's are a better choice im not knocking the 4l80e...im just mentioning that the 700r4 is more economical for what you end up with.

 

Hey monsterbronk, just thought I'd let you know your facts are all screwed up!!!

Don't listen to him. All the rotating parts from a 4l60e are the same as a 700, with the exception of no governor drive on the output shaft, and the pump housing is different because of a different boost valve assembly.

A lot of the upgrade parts for a 700 (4l60) come from the 4l60E. Notice the E on the end for electronic. A 350 is a 3l60, 400 a 3l80, etc. GM changed the naming system in the early 90's.

And upgrades like pinless accumulators, 3-4 clutches, sunshell, pump, servos,etc. swap right into either a 4l60e or 700. I build these trans on a regular basis for high horsepower and for heavy towing. Built a 4l60 that towed over 17,000 lbs gvw days after I built it behind a vortec 350. The kicker was he made two 1000 mile trips with it towing in over drive. (although I don't recommend towing in overdrive, but I do it myself)

4-number of forward gears
L- installed direction ( l=longintudal, t=transverse)
60-toque capacity (arbitrary number GM used, 30,40,60,65,80)
E-electronically controlled (if equipped)

Just one more question, exactly what happens when the trans goes out???

no movement in any gear, no reverse, no 3rd or 4th, it may be able to help understand why you lose trannies??

There's no way a properly built 4l60e is gonna fail with what you have for a motor.

 

700r4 and 4l60e are not the same trans at all....its like saying a ls1 is the same as a regular 350...not at all the same....ok in my opinion a 700r4 is a better trans as far as strength and reliability because of the multitude of aftermarket upgrade parts that can be installed....and they are right in saying that it is most likely the rebuilding shops fault...however...i would say that 98% of trans shops only do a "stock" rebuild on them using the cheapest parts available...and most dont do any high perforamnce or upgrade work that i know of....you would have to find like a race car shop or offroad shop that specializes in upgrading the internals of the 4l60 to survive abuse....they probably just keep rebuilding it to stock and thats why it keeps going out.

if you don't know hwat you're talking about, then don't post this kind of crap! you'll only confuse people more.
pretty much all the hard parts in the th700 and 4L60E are all the same. the only true difference is that the 4L60E is the electronically controlled version of the 700.
i hate when people come on here spewing BS opinions based on absolutely nothing. educate yourself and then post. until then, keep your BS opinion to yourself.

 

back to the question at hand:
what exactly is failing on the 4L60E transmissions in your buddies yukon? and what was done to them when they were rebuilt to beef them up?

i think that a properly built 4L60E will hold up just fine, unless it's driven by a complete jackass.
also keep in mnd that doing a conversion will be expensive and time consuming. here's a short list of what you'll have to change or modify:
transmission
transfer case adapter
transfer case input gear
transmission cooler lines
cross member
front drive shaft
rear drive shaft
computer controls
torque converter
...............

 

What ____evar

 

:barf:

 

" i hate when people come on here spewing BS opinions based on absolutely nothing. educate yourself and then post. until then, keep your BS opinion to yourself."
yeah i hate that too...hmmm

 

why don't you quit wastin' bandwith, newbie fawktard!

every single one of your posts is BS. contribute something useful or shut the fuck up! :mad3:

 

why don't you quit wastin' bandwith, newbie fawktard!

every single one of your posts is BS. contribute something useful or shut the fuck up!

Once again......


MONSTRBRONK=DUMBASS!!!

 

yea monsterbronk...if u knew anything ud know that orange fj is a tranny man!!! but then if u knew anything ud also know that in 1990 chevy changed the tranny naming system and that the same tranny that was made in 1989 known as the 700r4 became the 4l60 with this process. and the E stood from electronic. not much different besides a few selenoids in the valvebody

 

yeah and the case...and the torque converter and the output shaft and the etc..etc...etc...etc they are a weaker transmission....some of the parts are interchangable NOT EVERYTHING....they are a DIFFERENT TRTANSMISSION...GM CHANGED THE NAMING SYSTEM BECAUSE IT IS A DIFFERENT TRANSMISSION THERFOIRE DIFFERENT MODEL # if they are the same trans then put in a 700r4 IT SHOULD JUST DROP RIGHT IN PLACE AND EVERYTHING SHOULD HOOK RIGHT UP>>>HAHHAHA NOT

 

Once again......


MONSTRBRONK=DUMBASS!!!

thats not what your wife said :smokin:

 

uh hey stupid, if u put a 700 in place of a 4l60 everything does bolt/hook right up:flipoff2: