Quick 4L60E question.....

'JustDreamin'

Dream: 6LV8 Turbo Bravada
Hey Guys....

I've got a quick 4L60E question, and since you're the most knowledgeable group of folks I know I figured I'd ask it here.

Here's the skinny.
Truck is a 1999 Bravada with 4.3l v6, 4L60E, and awd.
Driving home tonight, trans didn't shift into 4th after slowing down to pay toll. No noise, drama or anything to say its having a bad day. Wasn't even hard on the throttle (and that's only with the 190hp V6).

Figured it might be an electrical gremlin. Got to the other side of the bridge, stopped, put in park, flipped engine off & restarted, hoping everything was fine. Accelerate away, and it takes forever to shift (like 5,000rpm in 1st) and then drops like a rock to 3rd (skips 2nd completely). Still no 4th.

Still had a while to go, no SES lights or anything, so I slow down to 60, and drive the remaining 15 miles or so to the baby-sitter's to pick up the baby. Make it there without any significant difficulty (or noise or anything else) except no 2nd & 4th.

Check the fluid level while I'm at the sitters, and its just on the bottom end of the hot range. Not out of limits that I can tell, but might have been short if the trans was running hot.

When I go to leave, Suprise!, no reverse.

Checked the service manual, and the only cause for No 2nd / 4th / Reverse is broken reaction shell splines (or something to that effect). Looks and sounds expensive and / or time consuming (especially since I think those parts attach to the output shaft, which I think is the first part installed in the trans (and therefore last out)).


So, here's my questions:
1.) Do I need to bother re-checking fluid level?
2.) How terminal is this (ie any chance that it is just short on fluid or something else easy)?
3.) How likely is it that if the reaction shell or whatever part it is that broke that it didn't take most of the rest of the trans with it? I'm sure the answer is an "only a teardown will tell" but what is your guys experience.
4.) Shouldn't it have tripped a SES light?

Previously, I was kind of on the fence as to whether I'd keep the 4L60E / 4L65E or step up to the 4L80E when I swap in the 6.0l V8 that is in my gameplan. Beginning to look like the wise choice would be to do that now....Ah....Decisions decisions.

'JustDreamin'
 

kessler

New member
Re: Quick 4L60E question.....

well i have alot of Experiance in thoes, So ill just say this, time for a rebuild or a Junk yard Special.
I have had a couple of Blazers have that same Problem come into the Shop and the only Way around it is to replace it. Changing the Fluid on thoes only makes it 10X worse
 

jwaller

Evil Genius/SyTy Guru
Re: Quick 4L60E question.....

it's a $30 problem that takes 10hrs to fix. rebuild time. go ahead and spend the $ to fix it up with a stock rebuild.
 

blk97ta

Member
Re: Quick 4L60E question.....

while were on the topic of this waller (not exactly on topic but ) can you build a4l60e to handle 750fwhp ? i need someone good to build one for my TA if so send me a pm on price :tup:
 

jwaller

Evil Genius/SyTy Guru
Re: Quick 4L60E question.....

750 shouldnt be that big a deal esp with it being FWHP.
 

GTMOTORSPORTS

New member
Re: Quick 4L60E question.....

I got one too,quick question.I have a 95'camarowith an LT1/4L60E. i was driving home from work,when i slowed for a stop sign and took off it would not shift out of second.first to second is fine and so is reverse,but no third or fourth.

I was told it was some thing easy to fix but was time consuming,as you guys have stated.Any clue.It is the second transmission i have had in the car.

I 'd like to build it once more and be done.i'm going with a 396 stroker and dont want it to die again any time soon.This trasmission had 40,000 miles on its previous rebuild.Thanks for the insight.
 

George Blake

DONATING MEMBER
Re: Quick 4L60E question.....

3-4 clutches are burnt.
What kind of output are you looking at out of the 396 stroker?
 

GTMOTORSPORTS

New member
Re: Quick 4L60E question.....

Im hoping at least 450 at the crank.I know some my think that is a little low,but i want to keep it some what streetable.I really cant get into taking a nice car and letting it sit.I like what super chevy was doing with the pro-charger/lt1.I know some guys get about 500 out of the 03-04 supercharged cobra with a new pulley and reflashing the computer.I see it this way if i shot for 450 and get 575 then im real happy,If i shot for 550 ang get 450 then im really upset.So ill low ball the combo and let tony bishoff and his crew figure if itll get more.can you build a trnny for that power.i was hoping to get a good auto so that i didnt have to switch over to a 6-speed,which i have already purchased just in case.thanks and sorry for hacking this tread for my own question.Hope i didnt upset any one
 

George Blake

DONATING MEMBER
Re: Quick 4L60E question.....

From another thread:
Originally Posted by George Blake
$6200. Gets built trans including the core. Built meaning, 300M input, 300M mainshaft, alto reds and blues, forged hub, transgo HD 2 kit, 34 element sprag, + other little upgrades, cryo'd machined output shaft, sun gear shaft, input and main shafts, valvebody modifications, new separator plate, new electronics, dyno'd. Custom 10.5" torque converter(built for WOT lockup), special Gilbert front prop, JS manufacturing retrofit kit, and TCI computer. The converter gets dyno'd with the trans to make sure everything works. Only thing you have to do is have your driveshaft shortened locally(it costs anywhere from $50 to $100 to have it done and isn't worth the extra cost of packaging and shipping to do.)
Remember, this is for the guy that just dumped $10k-$15k in an engine that's putting down consistent 500+foot pounds of torque and driven like it does that.
I wish guys would do this part first BEFORE dumping a bunch of money into their engine and then leaving the truck sit for 3 or 4 years(I've seen it) because their owners get pissed at the truck. Or better yet, get the guy(they are reading this too) that has put money into 4 or more rebuilds at $1500 to $2500 a pop. That gets really old really quick.
If a guy calls me and asks for a 700, I'll tell him prices and what's in it.
What usually happens, is during converter selection, they tell me, it puts down 650 foot pounds and they plan on running 30 pounds of boost and plan on running low tens. That's when I explain to them that they need to go ahead and budget for the drivetrain and just baby the stocker until they are ready to do what should be done instead of just getting by while they wait on it to break. A 700 can be built up. I've done it, John's done it, Mike Lee has had them done, it can be done. You have to compare investment in building a 700 that you will break again and investing in a 80e conversion.

You want a 2wd 4L80E as a core. Some early and ALL late model 4wd 4L80E's will have NO reluctor wheel for the TOSS sensor. You can use one if that's all you can get but you have to use a sonnax reluctor wheel that presses onto the rear planetary.

Yours won't cost near that much because you've got the computer(you need a different harness and a reflash), but you'll need the new converter and the transmission crossmember.

Here's the crossmember:
tcc008.jpg

Email me for more help if you need it. I can answer more of those as my PMs fill up quick.
 
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