A/T Lockup

[JSchooley]

I am new to this site. I think it is the greatest I have seen on any subject. I haven’t had time to read half the info on the 99’s.

I have a 99 1T with A/T 4. 10 axle. I can’t get into lock up in third gear pulling my 5th wheel most of the time. I even had it happen empty while pulling a 7%? grade. I shift out of OD when I drop to 55 MPH and the RPM goes towards 3 grand. I have tried letting up on the throttle and slowing down but no dice. DC says nothings wrong and suggested I install an aux transmission. I now have a Gearvendors OD added which helps, but I think the real solution is to get into lockup. What experience do others have? I have heard of adding a manual switch. Any thoughts on that? Where can I buy one?

------------------
John S. 1999 QC 3500 4. 11 Auto with all options and leather stock plus gearvendors

 

[Sam]

I have a 98 ISB 4. 10 and a auto at 55 in third it will turn 3000 rpms so yours is working right. With the 4. 10s in third 60 mph is all you will get at red line.

------------------
1998 2500HD,reg cab,4x4,auto,4. 10LSD,ISB,trailer tow, boss 8'2"v-plow,pyro,boost,trans temp gauges,up graded sound system,265/75/16 tires,KC backup lights,husky floor mats, SS nerf bars,,forest green and driftwood. Ironwood, Michigan

 

[Boldt's Wagon]

For RPM vs speed tables see:

http://www.ecpe.vt.edu/~dfritz/technical/AXLES/rpm_vs_mph.htm


[This message has been edited by Boldt's Wagon (edited 01-09-2000). ]

 

[Archive]

It sounds like what you need, is what I have! To get into lockup and stay there you need BD's Auto-Loc, it's also the only safe way to use an Exhaust Brake.

------------------
George MacGillis
Portland, Or.

99'24v ISB QC SB 4x4 SLT LARAMIE BD Brake BD AutoLoc 4. 10 LSD Auto, Pyro,Boost and Trans Temp Gauges, K&N Air Filter, All options plus Leather and Radio controles, Pulling a 3 Horse BP Slant American trailer and my 2 Morgans.

 

[JSchooley]

Sorry about the slow reply. I have been doing a lot of research on my transmission based on your replies which all have been very helpful.

I previously had my truck to DC three times asking them to look into the lack of lock-up in third gear. Each time they took it for an unloaded quick around the block evaluation and said "No Problem".

My main concern is pulling a 12,000 pound load up a 6% long grade with no lock-up. This has to be very punishing to the torque converter. For reference, I was pushing near red line at the top of the hill to get 55 MPH- lots of slip in the converter.

But success!! Today DC admitted to the lockup problem and will replace the valve body and I presume reflash the memory. Persistance and a little knowledge paid off.

Thanks for your inputs.

 

[Mike Carter]

John, yes you do have a legit problem it it won't lock empty up a 7% grade.

Sound like you've finally got the dealer moving. I would also suggest checking throttle position input to trans.

Does it lock fine in OD and only fail to lock in #3?

Mike

 

[Power Wagon]

BD has a neat little box called the Torque Lock. It keeps your TQ locked at all times when you are over 25 MPH. It can be switched in and out.

I have no idea how the shifts are with this thing in lockup... . does anyone know? I'd appreciate the info.



------------------
Lost your PSD? Look under my tires...
Your Chevy missing? It might be stuck in my grille.

'65 Power Wagon. 318, 4 speed, Crew Cab. Nope, not diesel - can't afford it. Need fuel system questions answered? Ask me, I work on them.

 

[JSchooley]

Got my truck back today. They did replace the valve body and download a new program for the transmission. Drives OK. Goes into lockup OK.

Mike, Your comment about going into lockup in OD but not in 3rd was exactly what was happening. I do not understand the relationship between the valve body and the lockup unless there is some feedback on fluid pressure of something.

My brother bought a 00 and had the check engine light come on. DC replaced his valve body with an upgraded version. The explanation was that limited fluid flow would cause the check engine light to come on. They said it didn't really effect anything, but the directive was to upgrade any vehicle that had the check engine light due to the transmission problem.

I have a feeling they replaced my valve body for the same reason and the lockup problem may not have been directly related to the valve body. You may be closer to the reason in suggesting the lingage may need adjustment.

Also, I am interested in the BD Torque Lock, but I am curious about a couple of things. I'll post my questions in a separate subject.

Thanks again.

------------------
John S. 1999 QC 3500 4. 11 Auto with all options and leather stock plus gearvendors

 

[Firedup1]

Is there any way to force the transmission to stay in 3rd. This of coarse is while towing 10k, OD off and going up a grade. Simular to selecting 1st. or 2nd on the column. Seams like you only get a short amount of time with 3rd. then it shifts into 4th. and depending on how severe the grade start to lug. I can get it back into 3rd. by pushing on the go peddle and forcing a "kick down" shift, this from what I understand is tough on the auto's.

------------------
2001. 5 2500 Auto QC 4WD SB 3. 54’s Bright silver metallic, Camper and tow package.

 

[Joe G.]

You guys should read the following threads. The second thread gets kind of noisy and it's been locked, but carefully read the posts by Bill K. The BD Torque Lock is bad news for the TCC.

Firedup, if the OD is locked out then it will NOT shift to 4th. What is happening is that it is locking up the TCC. Since the stock TC is so low in efficiency the lock up seems like another shift.

The cheap way to prevent TCC lockup and maintain the 3rd gear ratio is to wire up a switch to prevent TCC lockup. The best way to deal with this whole thing is to get hold of Bill K. at DTT.


https://www.turbodieselregister.com/ubb//Forum4/HTML/005635.html


https://www.turbodieselregister.com/ubb//Forum3/HTML/003535.html

------------------
Joe George
Eureka, CA

'95 2500 CC auto 4X4,3. 54,Combo EGT/boost guage,custom switch panel,PacBrake,TST #5,DTT TC/VB,Automatic motorhome steps on both sides,Foldacover hard bed cover,Cummins chrome kit,Black steel grill guard,Front hitch receiver

 

[Mopar-muscle]

Originally posted by Power Wagon:
BD has a neat little box called the Torque Lock. It keeps your TQ locked at all times when you are over 25 MPH. It can be switched in and out.

I have no idea how the shifts are with this thing in lockup... . does anyone know? I'd appreciate the info.

power wagon , a neat little device that will burn up your TC in short order , the TC should NEVER be FORCED into lockup , a device like this is only used to mask a lousy designed TC , if you have an efficent TC lockup is not the big deal it used to be and will only be used for its intended purpose , keeping the transmission fluid cooler by not being in fluid coupling . the big jump we feel going into lockup( not me anymore with my DTT TC) is the inefficency of the torque convertor , the lower the rpm drop the closer to max efficency you are , why DC doesn't put a good TC in these things is beyond me #ad


firedup , if you have od locked out it should not go into OD , if it is you have an electrical problem .

jschooley , what they probably did was do the reflash 18-02-99 , OD is electronicly controlled , the VB only supply the fliud pressure to make the shift happen , the control to make it happen comes from the PCM.


[This message has been edited by Mopar-muscle (edited 05-15-2001). ]

 

[JSchooley]

OK, here's a short story of the latest on my transmission.

I put on torque-lock and pressure lock, took every thing off except guages and sold the truck.

I'm now a very happy owner of a 2001 6SP HO. No More AT Problems!!!

BTW, I'm sending this from BANFF in the Canadian rockies. I've just turned 3,000 Miles and am averaging over 13 MPG towing.

------------------
John S. '01 Silver QC LST 2500 6sp 3. 54. BD E-Brake. 50 Gal Aux fuel/tool box.

 

[Bob Wagner]

BUT WHOEVER BOUGHT YOUR TRUCK GOT SCREWED BY THE TORQUE LOCK DAMAGE

Maybe he wont become a Member #ad

 

[JSchooley]

Bob,

Point well taken, except I am always wary of the limitations and try to work within them. I would like to clarify my position on this truck just for my own edification.

I have always been reluctant to allow the transmission to shift or go into lockup under full load. If I detect any slip I get off the throttle immediately.

Keeping in mind that the lockup clutch slips everytime lockup is engaged, and many people drive with their foot in it while it is locking up, I don't think I have caused any excessive wear to the clutch. Also, damage is usually caused by excess heat which can be verified by the color of the transmission fluid. I have a temp sensor and am careful not to allow the temp to get unreasonably high.

I sold the truck to a very nice family which are neighbors of mine. I firmly believe they will have no problems with the truck. I gave them a very good deal on it, and will step in and make it right should any occur.

Sorry about the long post, I just wanted to make sure that nobody thought I dumped a damaged transmission on some un-suspecting body. It could sure be interpreted that way, but I believe he has a better deal than the Ford he was about to buy.

BTW - no offense taken. That was a good point.