Does '87 TF727 have a lock-up converter?

[710 Burner]

OK. I just tackled the second major leak on Valdez (may have to change the name to something else). I had to put in a new seal on the shifter shaft (say that 3 times fast)so I could keep my tranny fluid in the tranny. I modified the valve body while it was out and kept running into references to a lock-up torque converter. Do 87 GW's have lock-up converters. If so, it don't work.

[gsmikie]

if you dont have wireing on the valve body its non lock-up

[710 Burner]

I thought early 727's controlled the converter with hydraulics (the way it should be).

[AMX factor]

My 87 GW w/727 is lockup.

[Mavawreck]

i cant remember, i remember that it took me a friggin year to get the right shift kit for my 89 though because of the lock up or lack there of.

[MIDLERTH]

Mine had lock up and didnt have any wiring but it wasnt an 87 either. It was an 81.

[mdill]

I beleive, that most if not all FSJ's 80+ had lockup converters, there
maybe an exception for either J20's or trailering package models.

Mike D.

[jeepjake]

NONE of the Jeep 727's were lockup. AMC and Chrysler were too cheap for that. Went through this before on this same board. Everyone who "thought" they had lockups and who were "sure" they had lockups, didn't.

Jeep (AMC and Chrysler) used the older '79 style 727's.

[Michael]

My 87 is not a lockup.

[The Anti-Chrysler]

I have a Jeep brochure from '80 or '81 that says they were using an all-upgraded transmission with lock-up torque converter. It didn't specify whether it was the 727 or the 999. However, I think they stopped using it around '86. Don't know why, but they did. All the ones that had it, it was all hydraulic. No wires.

So basically like '81 to '86 had lockup, none others.

[Don S]

Originally posted by jeepjake:
NONE of the Jeep 727's were lockup. AMC and Chrysler were too cheap for that. Went through this before on this same board. Everyone who "thought" they had lockups and who were "sure" they had lockups, didn't.

Jeep (AMC and Chrysler) used the older '79 style 727's...
SORRY but to quote the 1981 Jeep TSM....

"CJ7, Cherokee, Wagoneer and Truck models with six or eight cylinder engines use a lockup torque converter"

and... "A high stall lockup torque converter is used with the 727 transmission for the six cylinder applications"

My '81 360 Wagoneer will drop about 50 RPM at 45 MPH when the torque converter locks up.

Good Luck.. http://www.boylover.net/ubb/graemlins/cool_shades.gifand CUL.. Don S..

[jeepjake]

Originally posted by Don S:
</font><blockquote>quote:</font><hr />Originally posted by jeepjake:
NONE of the Jeep 727's were lockup. AMC and Chrysler were too cheap for that. Went through this before on this same board. Everyone who "thought" they had lockups and who were "sure" they had lockups, didn't.

Jeep (AMC and Chrysler) used the older '79 style 727's...
SORRY but to quote the 1981 Jeep TSM....

"CJ7, Cherokee, Wagoneer and Truck models with six or eight cylinder engines use a lockup torque converter"

and... "A high stall lockup torque converter is used with the 727 transmission for the six cylinder applications"

My '81 360 Wagoneer will drop about 50 RPM at 45 MPH when the torque converter locks up.

Good Luck.. http://www.boylover.net/ubb/graemlins/cool_shades.gifand CUL.. Don S..</font>[/QUOTE]SORRY, but....., I can find a DOZEN manuals that say Jeeps (name the year) had "lock-up" trannys/TQ's. You won't actually FIND one on a Jeep though. Many of the shop manuals I took with me from the Jeep dealership I did builds at have this and that about lockups. Nary a Jeep that came through in the late '80's to early 90's had a lock-up. You may have a manual, book, paperwork, etc. that SAYS lock-up, but show me a pic of your tranny input spline and I'll show you a NON-LOCKUP.

[TexasJ10]

OK, I'll bite. What is different about the input splines of a 727 designed for a lock up converter and one that has a non lock up converter? Like a number of people here, I am surprised that the litature since 1981 says that the lockup converter was all that was offered, and it was largely pitched as a fuel saving device. It was suppose to engage upon the shift from 2nd to 3rd and disengage around 1100 RPM or a down shift to 2nd.

[Chevelleguy]

'83 Wag Lt. w/trailer pkg. No lock up.

[Don S]

Originally posted by jeepjake:
</font><blockquote>quote:</font><hr />Originally posted by Don S:

SORRY but to quote the 1981 Jeep TSM....

My '81 360 Wagoneer will drop about 50 RPM at 45 MPH when the torque converter locks up.

Good Luck.. http://www.boylover.net/ubb/graemlins/cool_shades.gifand CUL.. Don S..SORRY, but....., I can find a DOZEN manuals that say Jeeps (name the year) had "lock-up" trannys/TQ's. You won't actually FIND one on a Jeep though. Many of the shop manuals I took with me from the Jeep dealership I did builds at have this and that about lockups. Nary a Jeep that came through in the late '80's to early 90's had a lock-up. You may have a manual, book, paperwork, etc. that SAYS lock-up, but show me a pic of your tranny input spline and I'll show you a NON-LOCKUP.</font>[/QUOTE]..
SORRY but to quote the 1981 Official Jeep TSM....

Sorry again... but perhaps my TF727 has an extra gear in it.

My '81 360 Wagoneer will drop about 50 RPM at 45 MPH when the torque converter locks up.

Good Luck.. http://www.feebleminds-gifs.com/smiley-faces-28.gif and CUL.. Don S..

[mdill2]

I can fill th RPM drop in my 83, at 45 +/-
Can you describe the differance in the snout ?
I have a spair/junk Jeep 727 handy to take a
quick look.
99% sure my 83 has a lock up

Mike D.

[Don S]

..

To quote again from the 1981 Official Jeep TSM....

“ Never attempt to interchange lockup and conventional converters. The input shaft and valve body required for lockup operation are markedly different”.

Sorry but I don't have PICs


Good luck and http://www.michiganjeepers.com/forums/images/graemlins/wave.gif and … CUL.. Don S..

[TexasJ10]

I need to show my ignorance here. Does a tranny that uses a lock up converter have a fluid pathway in the input shaft that leads to a section of the converter which allows it to lock up if fluid is routed to it? I guess the follow on question would be, does the tranny have additonal internal valves that can sense speed and apply fluid to the converter under certain circumstances?

[Terry B.]

My '87 is non lockup.

[SBJeep]

I had been told previously by my transmission shop that non tow package GW 727s have lock-up, and tow package models didn't. All I can say for sure is that my '90 with a tow package doesn't have lock-up.

[tuckers89GW]

I do not believe mine does. '89 stock. I have driven many a trucks with and my Jeep doesn't. I have the tow package tho, if that makes a difference.

[gsmikie]

lock up the input shaft of the trans will have a trapped check ball in the end of it non-lock up will be a solid shaft

[TexasJ10]

Thanks

[Fitzworld]

I just had the trans out of my 87 GW for the installation of the Gil Younger shift improver and to freshen it up and I do not have a lock-up in mine.
I had a 87 Dodge 1/2 ton that did have the lock-
up and it was quite noticable when it did that lock up thing.

[Fitzworld]

I just had the trans out of my 87 GW for the installation of the Gil Younger shift improver and to freshen it up and I do not have a lock-up in mine.
I had a 87 Dodge 1/2 ton that did have the lock-
up and it was quite noticable when it did that lock up thing.

[Fitzworld]

I just had the trans out of my 87 GW for the installation of the Gil Younger shift improver and to freshen it up and I do not have a lock-up in mine.
I had a 87 Dodge 1/2 ton that did have the lock-
up and it was quite noticable when it did that lock up thing.

[710 Burner]

Apparently AMC pulled one of their old tricks on this one and I will not know unless I pull the tranny. Thanks to everyone for your input.