I have a 94 Suburban, 350 v8, 4x4 automatic, with 180,000 miles on it. When I shift to reverse, sometimes it engages immediately, other times it takes 3-5 seconds. The fluild was changed on transmission 6 months ago. Any thoughts as to what is happening. It used to engage immediately all the time.

Thanks,

12/16/2006 1:57:02 PM

you fucked it up when you changed the fluid

[Edited on December 16, 2006 at 1:59 PM. Reason : .]

12/16/2006 1:59:03 PM

Well, thats helpful. Any idea how? fluid shows full level. No leaks....

12/16/2006 2:06:41 PM

if u have a auto tranny that hasnt had the fluid changed in a long time. it is best to just leave the old shit in there and make sure it's full. u can fuck up an auto changing old old fluid out and putting new new stuff in.

12/16/2006 3:19:50 PM

Ok...In that case, any suggestions on someone who is good at rebuilding transmissions?

12/16/2006 3:22:36 PM

if the car still works why care. try throwing some additives in it.

[Edited on December 16, 2006 at 3:38 PM. Reason : .]

12/16/2006 3:38:16 PM

thats normal with a high mileage th-700r4/4L60E let it go, it is usually worse when its cold, my 92 gmc did that from about 150k-275k

12/16/2006 10:02:30 PM

yea dont rebuild it yet unless you wanna waste some money

12/16/2006 10:08:39 PM

these guys have already hit the nail sqare on the head.

If it was the first time the fluid was changed, you might be getting a new tranny soon. A buddy of mine changed the fluid in his S10 at 160k for the first time. 10k later, boom.

12/16/2006 11:20:11 PM

Any suggestions on what type of additives? WTF, at this point, if it is going to go, it cannot make it worse.

12/17/2006 9:24:33 AM

would you like to explain to us retards (car_dave and I) how changing the fluid causes the transmission die.

12/17/2006 9:46:45 AM

don't know. many career mechanics i know swear by that theory and in fact they advise to never service a transmission.

12/17/2006 1:24:33 PM

i get my transmissions serviced every 30k.

works great.

as long as you maintain them, nothing happens. if you don't for a long time and then start changing fluid, people tell me it's bad, but can't explain. i try not to ignore preventative maint.

12/17/2006 1:43:45 PM

we've got an OLD forklift in the shop that stopped running after we changed the oil

put the old oil back in and it started right up

12/17/2006 2:19:56 PM

LUCAS,..........Shit works

12/17/2006 3:14:13 PM

Yea, throw some Lucas or other viscosity enhancing stuff in there and see what happens. May fix it right up.

12/17/2006 3:46:52 PM

what happens to neglected transmission in a nutshell is, the old fluid builds up a lot of metals and clutch and band material and when the bands are almost shot because of the dirty fluid, the friction material and lower viscosity of the old fluid is the only thing that keeps it going, aslo you have a lot of crap building up everywhere, and fluching it tends to break it loose and send it through all the valves, solenoids and servos and plugs shit up, next thing you know they stick and don't engage all the way, the clutches and bands burn up, and your tranny is toast

i personally never flush a transmission without pulling the pan, some people say it is overkill, but i do a cooler line flush, then drop the pan and clean it out, put a new filter on, and top it off, you'd be surprised how much shit is left in the bottom of the pan even after a flush

[Edited on December 17, 2006 at 9:27 PM. Reason : gm friction additive is all you really need, i believe BG makes it, dont fill it up with snake oil]

12/17/2006 9:27:03 PM

a sluggish transmission is nothing to worry about. that's what happens when they get some age on them

12/17/2006 9:29:11 PM

Reverse in most automatic transmissions (700R4s included) uses the highest line pressure...if it takes a bit for it to engage, or if it does it usually when the truck is warm, then you can probably bet on the front pump having a bit of wear on it. The 700R4 uses a vane-style, variable displacement front pump. Could be a problem or two with the pump internals.

HOWEVER...

You really can't diagnose an automatic tranny correctly without checking line pressure at the various ports provided. There are several for line pressure, governor pressure, servo pressure, etc...and it's best to leave this shit up to a qualified tranny mechanic, or at least somebody who knows what the hell they're doing.

But, if you wanna try the additive trick, then get you some Sea Foam Trans Tune and follow the directions on the can. I know a coupla folks what swear by that shit.

I ain't much on Lucas anything, but some folks like that too. Like gk2004...Dave, I don't get it. I swear the shit is snake oil.

12/18/2006 12:58:36 AM