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Mikes94Dakota
Dodge Dakota
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7/28/2004
15:16:59

Subject: Won't shift into 4th
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When I am under WOT on the highway if I get past 85 it will not shift into 4th gear when the O/D is off? Whats the deal? WHen I turn on the O/D fourth gear pops in and the lockup torque converter kicks in. Anyone can tell me why my fourth gear doesnt work I have hit 5200 rpms in 3rd doing about 112?



daddio
Dodge Dakota
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7/28/2004
15:42:58

RE: Won't shift into 4th
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i believe that the od on is 4th. if you turn it off it won't go into 4th. not sure i got a 5 spd. no pesky od button for me.



Bob Lincoln
Dodge Dakota
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7/28/2004
16:19:43

RE: Won't shift into 4th
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The O/D IS 4th gear. So it will stay in 3rd if you turn the O/D off (O/D light on).

With the O/D off, the torque converter will eventually engage in 3rd gear. With the O/D on, the torque converter doesn't engage until 4th.



J and J Auto
GenII
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7/29/2004
01:39:33

RE: Won't shift into 4th
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Hers how it works
O/D light off
1-2
2-3
3- O/D
O/D- lockup

light on O/D off
1-2
2-3
3-lockup

it will not shift O/D 4th with light on

Larry
J&J Auto

Mikes94Dakota
Dodge Dakota
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7/29/2004
12:31:13

RE: Won't shift into 4th
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If i dont have o/d off then my O/D an lockup kicks in at 94 m.p.h. and it feels like its a governor....anyway i can take this crap o/d off without taking out my O/D button off....it just feels like I should be able to hit way past 110 m.p.h. not like I really want to but its just wierd.....it almost sounds like I have a 3 speed with O/D??



Bob Lincoln
Dodge Dakota
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7/29/2004
15:43:54

RE: Won't shift into 4th
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"If i dont have o/d off then my O/D an lockup kicks in at 94 m.p.h. and it feels like its a governor" With the O/D on, it should shift in at somewhere between 35 and 45 mph on the level with light throttle, or about 60-70 when pushing it. I think you'd better re-read what Larry and I posted, you don't seem to understand how your transmission works.

The A-500 (42RH) was used on the V-6; the A-518 (46RH) was used on the V-8. They are basically an A-999 transmission with an electric overdrive unit added to the rear of it. The A-999 is basically a hybrid of the old A-727 and A-904 3-speed automatics; it takes some elements from each. So your tranny is a 4-speed automatic overdrive. Gear ratios are approximately:

1st: 2.54:1
2nd: 1.54:1
3rd: 1.00:1
4th: 0.69:1 (which is also known as overdrive)

You also have a lockup torque converter. Shifting is as Larry so concisely explained. It sounds like you are turning off the O/D and not understanding what to expect when you do so; and that all is working as it should.



Mikes94Dakota
Dodge Dakota
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7/29/2004
16:39:20

RE: Won't shift into 4th
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Well I understood what yall said...its just that under WOT acceleration I cant get past 3rd gear right?



Bob Lincoln
Dodge Dakota
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7/29/2004
20:58:28

RE: Won't shift into 4th
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Well, duh, that depends on the speed, engine load, slope, temperature and other parameters of the engine that all go into the decision to shift or not to shift into highest gear. Try this brainstorm: don't go 112 mph and it will probably shift into 4th. Amazing how that works.



Patient
Dodge Dakota
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7/29/2004
20:59:20

RE: Won't shift into 4th
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Doctor, doctor, it hurts when I do this!

Then don't do that!

8)



daffydak
GenIII
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7/30/2004
01:15:32

RE: Won't shift into 4th
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i discovered a way to kick out of lockup, without getting into the gas hard. just BARELY depress the brake pedal..... just enough, so that the tail lights come on. I did that all the time in my old 3.9L, when I was coming up on a hill. it would pull steep hills better out of tq converter lockup (and still stay in OD (except on pretty big hills), thus not wasting excessive fuel)

just my .02

Dan

MOPAR=More Power!!

Mikes94Dakota
Dodge Dakota
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7/30/2004
11:03:20

RE: Won't shift into 4th
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Bob Lincoln....If I have O/D off and I hit anywhere past 80 m.p.h. it WILL NOT SHIFT INTO fourth gear EVEN if I let OFF THE PEDAL.....it rides out 3rd gear till I hit about 65-70 and then shifts into the next gear....amazing how that works huh??!?



Bob Lincoln
Dodge Dakota
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7/30/2004
15:55:21

RE: Won't shift into 4th
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"If I have O/D off and I hit anywhere past 80 m.p.h. it WILL NOT SHIFT INTO fourth gear EVEN if I let OFF THE PEDAL"

IT'S NOT SUPPOSED TO!!! No need to shout. 8)
If you turn O/D off, it's off. Period. No 4th gear. It's locked out until you turn the ignition off and restart the truck, or turn it back on.
Yeah....amazing how people don't read posts before replying.

"rides out 3rd gear till I hit about 65-70 and then shifts into the next gear....
No. That's not shifting into the next gear, which is 4th (O/D), which you locked out. It's the lockup torque converter engaging, which feels like an upshift.



Mikes94Dakota
Dodge Dakota
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8/01/2004
12:12:22

RE: Won't shift into 4th
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How is it the lockup when the O/D button is still off?.....BTW I wasnt trying to shout....just merely getting my point across.



Bob Lincoln
Dodge Dakota
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8/01/2004
20:56:07

RE: Won't shift into 4th
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Please read the posts. As Larry said, when O/D button is in on position, lockup occurs after shift into 4th. If O/D button is off (light on), tranny will not shift into O/D (4th), but it will still lockup after shifting into 3rd.

I'm still not sure what problem you're trying to solve.



Mikes94Dakota
Dodge Dakota
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8/02/2004
11:47:18

RE: Won't shift into 4th
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Ok...now thats what i was trying to get across....it will lockup after the shift into 3rd with O/D off....What im trying to understand is when under WOT My truck shifts into 4th and Lockup at about 93-94 m.p.h. like it has not enough power to keep pulling?



Bob Lincoln
Dodge Dakota
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8/02/2004
13:03:03

RE: Won't shift into 4th
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All upshifts are delayed more, the more you stomp it. So 93 mph is when you get 4th and lockup. You can adjust upshift speeds with the TV cable that runs from throttle body to tranny. If it won't go faster, that may be all it's capable of; or it may need some tuning/repair. Are you saying 93 mph is top speed? That can be true of an old vehicle in fair condition that pushes a lot of air...



Mikes94Dakota
Dodge Dakota
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8/02/2004
13:40:56

RE: Won't shift into 4th
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With O/D off I can get it to 111 m.p.h. at 5200 rpms...and when doing redline the motor gets hot...so no 93 is not top speed ists more like maybe 97 or 98 with lockup but i havent had a long straightaway for this and dont tend to either....just really curious why the fourth gear and lockup kicks in early?



daffydak
GenIII
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8/02/2004
14:16:09

RE: Won't shift into 4th
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did you do the TPS mod? if i'm not mistaken, the TPS controls shifting after second gear (and TQ converter lockup, among other things) It should read around 4.0v at WOT, and .76 is the optomal inital setting. mine was at .56 inital and 3.80 WOT. it made a diference in driveability, but my tranny (45rfe) is computer controlled (no kickdown cable :)

just my .02

Dan

MOPAR=More Power!!

Mikes94Dakota
Dodge Dakota
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8/02/2004
15:04:10

RE: Won't shift into 4th
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No TPS mod here.....thought of it but wont have my truck for long...soon hoping tomorrow looking at a 99 RC 318 (Stripper). So.....well see if I get this new dakota?



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