HELP!

[Camino LS6]

I need a '88-'92 Chevy or GMC 4X4 700R4 transmission by tomorrow at the latest.

Any ideas?

[Intrepidation]

junkyard

[Camino LS6]

Our junkyards suck (and are under 3+ feet of snow).

I need to find one of these on a shelf somewhere, out of the vehicle.

[Justin Bimmer]

Our junkyards suck (and are under 3+ feet of snow).

I need to find one of these on a shelf somewhere, out of the vehicle.

GM dealer?

[Intrepidation]

Call around? I'm sure one will have an transmission already out. Hell if you wanna drive I know of a couple in the area that will probably have one.

[Blake Noble]

I probed CG a bit for you.

'84 model 700R4 with transfer case for $350:

http://philadelphia.craigslist.org/pts/1591348842.html

This probably isn't what you're looking for, but nevertheless:

http://philadelphia.craigslist.org/pts/1597852934.html

Another one out of an F-Body:

http://philadelphia.craigslist.org/pts/1588330249.html

Another one (sadly) out of a SyTy truck:

http://philadelphia.craigslist.org/pts/1589345358.html

And another:

http://pittsburgh.craigslist.org/pts/1594783760.html

Edited February 12, 2010 by whiteknight

[Camino LS6]

Thanks guys.

WK: Seen all of those, I'm told none of them will work. Has to be an early EFI truck.

It seems that parts and reman units are largely not available anymore, been through all of the local dealer's contacts already.

[BigPontiac]

http://www.car-part.com

[Satty]

Still have your Tahoe?

[Blake Noble]

WK: Seen all of those, I'm told none of them will work. Has to be an early EFI truck.

Is your transmission a 4L60 or 4L60-E? If it was a 4L60, I actually want to say the '84 model transmission I linked to should work, regardless of EFI.

I'm not 100 percent sure, though.

Obviously, the 4L60 wouldn't work in a truck with a 4L60-E.

Perhaps this chart would help? http://www.gmautomatictransmissions.com/transmission_applications.php

EDIT: Well, the ECM is a factor I didn't really consider, so now I'm really unsure.

Edited February 12, 2010 by whiteknight

[Camino LS6]

Thanks BP!

I'm going to call Al's Auto in Trevose in the morning.

Satty: Yeah, I still have the Tahoe. I would never raid it for the trans even if it was the right one (which it isn't).

[Camino LS6]

Is your transmission a 4L60 or 4L60-E? If it was a 4L60, I actually want to say the '84 model transmission I linked to should work, regardless of EFI.

I'm not 100 percent sure, though.

Obviously, the 4L60 wouldn't work in a truck with a 4L60-E.

Perhaps this chart would help? http://www.gmautomatictransmissions.com/transmission_applications.php

EDIT: Well, the ECM is a factor I didn't really consider, so now I'm really unsure.

Yep, the ECM is the issue. I have to have one with all the right connections, has to be 4x4, has to be a 700R4 and not a 4L60, has to be a TBI truck, etc.

[Satty]

People do wacky things out of desperation. They might even sneak out and find a similar truck, steal it, do a quick and dirty surgery and go on their merry way. Not that I would condone such behavior, just saying that it is something someone could do.

[Blake Noble]

Yep, the ECM is the issue. I have to have one with all the right connections, has to be 4x4, has to be a 700R4 and not a 4L60, has to be a TBI truck, etc.

1980s engine electronics are a headache.

Your truck is either an '88 or '89, too. That's something else I wasn't sure of.

[Camino LS6]

People do wacky things out of desperation. They might even sneak out and find a similar truck, steal it, do a quick and dirty surgery and go on their merry way. Not that I would condone such behavior, just saying that it is something someone could do.

Very true.

This would be a tough one though, without a lift, air tools, and tranmission jack.

I'm not even tempted.

[Camino LS6]

1980s engine electronics are a headache.

Your truck is either an '88 or '89, too. That's something else I wasn't sure of.

Yeah, it's an '89.

Stuff becomes sooo obsolete soooo quickly these days. I didn't anticipate not being able to buy a reman unit.

[Camino LS6]

Believe it or not, it is far easier to deal with this with a TH400 - even in these years.

[Blake Noble]

Yeah, it's an '89.

I was thinking '91 for some reason.

Stuff becomes sooo obsolete soooo quickly these days. I didn't anticipate not being able to buy a reman unit.

Honestly, there isn't much that doesn't become obsolete overnight. I can't think of one consumer product, cars or whatever, that's an exception to the rule. It's a little bit ridiculous.

[Camino LS6]

Unfortunately, parts support has eroded badly in recent years.

It's easier to get parts for an ancient musclecar than anything from the 80s and 90s now.

[SAmadei]

Yep, the ECM is the issue. I have to have one with all the right connections, has to be 4x4, has to be a 700R4 and not a 4L60, has to be a TBI truck, etc.

Just a stupid thought, but why not disconnect the ECM to tranny link and see who the current busted tranny runs. I would think it would still function well enough and not do any damage... but you'll get a CEL. Then you could use a "regular" 4x4 ready 700r4 to get by and fix it right later.

[Camino LS6]

Just a stupid thought, but why not disconnect the ECM to tranny link and see who the current busted tranny runs. I would think it would still function well enough and not do any damage... but you'll get a CEL. Then you could use a "regular" 4x4 ready 700r4 to get by and fix it right later.

Not a bad idea!

[Camino LS6]

I only really need first and reverse in this thing anyway!

[Blake Noble]

I'd remove the electronic junk off of this truck personally. It would make it so much easier to patch up.

Find a carb'd SB350/TH400 combo and drop it in.

[SAmadei]

Looking up the tranny in the Hollander shows quite a few donor vehicles...

Its a 1904B, but 1904A interchanges, as one has a aux valve body. Seems to be pretty common 1983-1989 4x4s.

Its a long list. If you want I can scan it, but its likely easier to just ask me... pretty much everything 4x4 and gas... goes to 1992 in Suburbans.

[Camino LS6]

If I'm not getting everything assbackwards, the ECM controls transmission functions, tells it when it should shift, controls the torque-converter lock up, and so on. Without the trans hooked up to it, you'll be sitting.

My problem is knowing how to get rid of '80s model engine electronic systems, not work with them.

Actually, Camino, that's what I would do with your plow truck, get rid of the ECM so that the truck is simpler and easier to patch up. It can be done with the EFI motor in your truck. Or do you have to keep it for emissions testing?

Legality is an option for this truck - I don't really care if it is legal.

It just has to push snow (and be able to back-up)

I'm told there are conversion kits to put a TH400 in this truck, but I don't care about it enough to do that.